Upgrade dependencies

Fixes #49

docs/classes/arraypredicate.html

@@ -936,6 +936,9 @@ img { max-width: 100%; }
 				<li class=" tsd-kind-method tsd-parent-kind-class">
 					<a href="arraypredicate.html#includesany" class="tsd-kind-icon">includes<wbr>Any</a>
 				</li>
+				<li class=" tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<a href="arraypredicate.html#is" class="tsd-kind-icon">is</a>
+				</li>
 				<li class=" tsd-kind-method tsd-parent-kind-class">
 					<a href="arraypredicate.html#length" class="tsd-kind-icon">length</a>
 				</li>
@@ -962,13 +965,31 @@ img { max-width: 100%; }
 		<li class=" tsd-kind-class">
 			<a href="errorpredicate.html" class="tsd-kind-icon">Error<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="mappredicate.html" class="tsd-kind-icon">Map<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="numberpredicate.html" class="tsd-kind-icon">Number<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="objectpredicate.html" class="tsd-kind-icon">Object<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="setpredicate.html" class="tsd-kind-icon">Set<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="stringpredicate.html" class="tsd-kind-icon">String<wbr>Predicate</a>
 		</li>
-		<li class=" tsd-kind-interface">
+		<li class=" tsd-kind-class">
+			<a href="weakmappredicate.html" class="tsd-kind-icon">Weak<wbr>Map<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="weaksetpredicate.html" class="tsd-kind-icon">Weak<wbr>Set<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
+			<a href="../interfaces/collectionlike.html" class="tsd-kind-icon">Collection<wbr>Like</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
 			<a href="../interfaces/ow.html" class="tsd-kind-icon">Ow</a>
 		</li>
 	</ul>
@@ -988,6 +1009,12 @@ img { max-width: 100%; }
 				</li>
 			</ul>
 		</section>
+		<section class="tsd-panel">
+			<h3>Implements</h3>
+			<ul class="tsd-hierarchy">
+				<li><span class="tsd-signature-type">BasePredicate</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">&gt;</span></li>
+			</ul>
+		</section>
 		<section class="tsd-panel-group tsd-index-group">
 			<h2>Index</h2>
 			<section class="tsd-panel tsd-index-panel">
@@ -1013,6 +1040,7 @@ img { max-width: 100%; }
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="arraypredicate.html#endswith" class="tsd-kind-icon">ends<wbr>With</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="arraypredicate.html#includes" class="tsd-kind-icon">includes</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="arraypredicate.html#includesany" class="tsd-kind-icon">includes<wbr>Any</a></li>
+							<li class="tsd-kind-method tsd-parent-kind-class tsd-is-inherited"><a href="arraypredicate.html#is" class="tsd-kind-icon">is</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="arraypredicate.html#length" class="tsd-kind-icon">length</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="arraypredicate.html#maxlength" class="tsd-kind-icon">max<wbr>Length</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="arraypredicate.html#minlength" class="tsd-kind-icon">min<wbr>Length</a></li>
@@ -1036,7 +1064,7 @@ img { max-width: 100%; }
 						<aside class="tsd-sources">
 							<p>Overrides Predicate.__constructor</p>
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L5">lib/predicates/array.ts:5</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L5">lib/predicates/array.ts:5</a></li>
 							</ul>
 						</aside>
 						<h4 class="tsd-parameters-title">Parameters</h4>
@@ -1058,7 +1086,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">empty<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L97">lib/predicates/array.ts:97</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L97">lib/predicates/array.ts:97</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1073,7 +1101,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">non<wbr>Empty<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L107">lib/predicates/array.ts:107</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L107">lib/predicates/array.ts:107</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1089,7 +1117,7 @@ img { max-width: 100%; }
 				<aside class="tsd-sources">
 					<p>Inherited from Predicate.not</p>
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/predicate.ts#L50">lib/predicates/predicate.ts:50</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L68">lib/predicates/predicate.ts:68</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1111,7 +1139,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L119">lib/predicates/array.ts:119</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L119">lib/predicates/array.ts:119</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1142,7 +1170,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L63">lib/predicates/array.ts:63</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L63">lib/predicates/array.ts:63</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1173,7 +1201,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L75">lib/predicates/array.ts:75</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L75">lib/predicates/array.ts:75</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1204,7 +1232,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L87">lib/predicates/array.ts:87</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L87">lib/predicates/array.ts:87</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1225,6 +1253,61 @@ img { max-width: 100%; }
 					</li>
 				</ul>
 			</section>
+			<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+				<a name="is" class="tsd-anchor"></a>
+				<h3>is</h3>
+				<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<li class="tsd-signature tsd-kind-icon">is<span class="tsd-signature-symbol">(</span>fn<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">this</span></li>
+				</ul>
+				<ul class="tsd-descriptions">
+					<li class="tsd-description">
+						<aside class="tsd-sources">
+							<p>Inherited from Predicate.is</p>
+							<ul>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L79">lib/predicates/predicate.ts:79</a></li>
+							</ul>
+						</aside>
+						<div class="tsd-comment tsd-typography">
+							<div class="lead">
+								<p>Test if the value matches a custom validation function. The validation function should return <code>true</code> if the value
+									passes the function. If the function either returns <code>false</code> or a string, the function fails and the string will be
+								used as error message.</p>
+							</div>
+						</div>
+						<h4 class="tsd-parameters-title">Parameters</h4>
+						<ul class="tsd-parameters">
+							<li>
+								<h5>fn: <span class="tsd-signature-type">function</span></h5>
+								<div class="tsd-comment tsd-typography">
+									<p>Validation function.</p>
+								</div>
+								<ul class="tsd-parameters">
+									<li class="tsd-parameter-siganture">
+										<ul class="tsd-signatures tsd-kind-type-literal tsd-is-not-exported">
+											<li class="tsd-signature tsd-kind-icon"><span class="tsd-signature-symbol">(</span>value<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">string</span></li>
+										</ul>
+										<ul class="tsd-descriptions">
+											<li class="tsd-description">
+												<h4 class="tsd-parameters-title">Parameters</h4>
+												<ul class="tsd-parameters">
+													<li>
+														<h5>value: <span class="tsd-signature-type">any</span><span class="tsd-signature-symbol">[]</span></h5>
+													</li>
+												</ul>
+												<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span>
+													<span class="tsd-signature-symbol"> | </span>
+													<span class="tsd-signature-type">string</span>
+												</h4>
+											</li>
+										</ul>
+									</li>
+								</ul>
+							</li>
+						</ul>
+						<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4>
+					</li>
+				</ul>
+			</section>
 			<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class">
 				<a name="length" class="tsd-anchor"></a>
 				<h3>length</h3>
@@ -1235,7 +1318,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L15">lib/predicates/array.ts:15</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L15">lib/predicates/array.ts:15</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1266,7 +1349,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L39">lib/predicates/array.ts:39</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L39">lib/predicates/array.ts:39</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1297,7 +1380,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L27">lib/predicates/array.ts:27</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L27">lib/predicates/array.ts:27</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1328,7 +1411,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L131">lib/predicates/array.ts:131</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L131">lib/predicates/array.ts:131</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1365,7 +1448,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/array.ts#L51">lib/predicates/array.ts:51</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/array.ts#L51">lib/predicates/array.ts:51</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">

docs/classes/booleanpredicate.html

@@ -927,6 +927,9 @@ img { max-width: 100%; }
 				<li class=" tsd-kind-get-signature tsd-parent-kind-class">
 					<a href="booleanpredicate.html#true" class="tsd-kind-icon">true</a>
 				</li>
+				<li class=" tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<a href="booleanpredicate.html#is" class="tsd-kind-icon">is</a>
+				</li>
 			</ul>
 		</li>
 		<li class=" tsd-kind-class">
@@ -935,13 +938,31 @@ img { max-width: 100%; }
 		<li class=" tsd-kind-class">
 			<a href="errorpredicate.html" class="tsd-kind-icon">Error<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="mappredicate.html" class="tsd-kind-icon">Map<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="numberpredicate.html" class="tsd-kind-icon">Number<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="objectpredicate.html" class="tsd-kind-icon">Object<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="setpredicate.html" class="tsd-kind-icon">Set<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="stringpredicate.html" class="tsd-kind-icon">String<wbr>Predicate</a>
 		</li>
-		<li class=" tsd-kind-interface">
+		<li class=" tsd-kind-class">
+			<a href="weakmappredicate.html" class="tsd-kind-icon">Weak<wbr>Map<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="weaksetpredicate.html" class="tsd-kind-icon">Weak<wbr>Set<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
+			<a href="../interfaces/collectionlike.html" class="tsd-kind-icon">Collection<wbr>Like</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
 			<a href="../interfaces/ow.html" class="tsd-kind-icon">Ow</a>
 		</li>
 	</ul>
@@ -961,6 +982,12 @@ img { max-width: 100%; }
 				</li>
 			</ul>
 		</section>
+		<section class="tsd-panel">
+			<h3>Implements</h3>
+			<ul class="tsd-hierarchy">
+				<li><span class="tsd-signature-type">BasePredicate</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">&gt;</span></li>
+			</ul>
+		</section>
 		<section class="tsd-panel-group tsd-index-group">
 			<h2>Index</h2>
 			<section class="tsd-panel tsd-index-panel">
@@ -979,6 +1006,12 @@ img { max-width: 100%; }
 							<li class="tsd-kind-get-signature tsd-parent-kind-class"><a href="booleanpredicate.html#true" class="tsd-kind-icon">true</a></li>
 						</ul>
 					</section>
+					<section class="tsd-index-section tsd-is-inherited">
+						<h3>Methods</h3>
+						<ul class="tsd-index-list">
+							<li class="tsd-kind-method tsd-parent-kind-class tsd-is-inherited"><a href="booleanpredicate.html#is" class="tsd-kind-icon">is</a></li>
+						</ul>
+					</section>
 				</div>
 			</section>
 		</section>
@@ -995,7 +1028,7 @@ img { max-width: 100%; }
 						<aside class="tsd-sources">
 							<p>Overrides Predicate.__constructor</p>
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/boolean.ts#L3">lib/predicates/boolean.ts:3</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/boolean.ts#L3">lib/predicates/boolean.ts:3</a></li>
 							</ul>
 						</aside>
 						<h4 class="tsd-parameters-title">Parameters</h4>
@@ -1017,7 +1050,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">false<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/boolean.ts#L21">lib/predicates/boolean.ts:21</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/boolean.ts#L21">lib/predicates/boolean.ts:21</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1033,7 +1066,7 @@ img { max-width: 100%; }
 				<aside class="tsd-sources">
 					<p>Inherited from Predicate.not</p>
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/predicate.ts#L50">lib/predicates/predicate.ts:50</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L68">lib/predicates/predicate.ts:68</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1048,7 +1081,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">true<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/boolean.ts#L11">lib/predicates/boolean.ts:11</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/boolean.ts#L11">lib/predicates/boolean.ts:11</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1058,6 +1091,64 @@ img { max-width: 100%; }
 				</div>
 			</section>
 		</section>
+		<section class="tsd-panel-group tsd-member-group tsd-is-inherited">
+			<h2>Methods</h2>
+			<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+				<a name="is" class="tsd-anchor"></a>
+				<h3>is</h3>
+				<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<li class="tsd-signature tsd-kind-icon">is<span class="tsd-signature-symbol">(</span>fn<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">this</span></li>
+				</ul>
+				<ul class="tsd-descriptions">
+					<li class="tsd-description">
+						<aside class="tsd-sources">
+							<p>Inherited from Predicate.is</p>
+							<ul>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L79">lib/predicates/predicate.ts:79</a></li>
+							</ul>
+						</aside>
+						<div class="tsd-comment tsd-typography">
+							<div class="lead">
+								<p>Test if the value matches a custom validation function. The validation function should return <code>true</code> if the value
+									passes the function. If the function either returns <code>false</code> or a string, the function fails and the string will be
+								used as error message.</p>
+							</div>
+						</div>
+						<h4 class="tsd-parameters-title">Parameters</h4>
+						<ul class="tsd-parameters">
+							<li>
+								<h5>fn: <span class="tsd-signature-type">function</span></h5>
+								<div class="tsd-comment tsd-typography">
+									<p>Validation function.</p>
+								</div>
+								<ul class="tsd-parameters">
+									<li class="tsd-parameter-siganture">
+										<ul class="tsd-signatures tsd-kind-type-literal tsd-is-not-exported">
+											<li class="tsd-signature tsd-kind-icon"><span class="tsd-signature-symbol">(</span>value<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">string</span></li>
+										</ul>
+										<ul class="tsd-descriptions">
+											<li class="tsd-description">
+												<h4 class="tsd-parameters-title">Parameters</h4>
+												<ul class="tsd-parameters">
+													<li>
+														<h5>value: <span class="tsd-signature-type">boolean</span></h5>
+													</li>
+												</ul>
+												<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span>
+													<span class="tsd-signature-symbol"> | </span>
+													<span class="tsd-signature-type">string</span>
+												</h4>
+											</li>
+										</ul>
+									</li>
+								</ul>
+							</li>
+						</ul>
+						<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4>
+					</li>
+				</ul>
+			</section>
+		</section>
 		<footer>
 			<div class="container">
 				<h2>Legend</h2>

docs/classes/datepredicate.html

@@ -930,18 +930,39 @@ img { max-width: 100%; }
 				<li class=" tsd-kind-method tsd-parent-kind-class">
 					<a href="datepredicate.html#before" class="tsd-kind-icon">before</a>
 				</li>
+				<li class=" tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<a href="datepredicate.html#is" class="tsd-kind-icon">is</a>
+				</li>
 			</ul>
 		</li>
 		<li class=" tsd-kind-class">
 			<a href="errorpredicate.html" class="tsd-kind-icon">Error<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="mappredicate.html" class="tsd-kind-icon">Map<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="numberpredicate.html" class="tsd-kind-icon">Number<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="objectpredicate.html" class="tsd-kind-icon">Object<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="setpredicate.html" class="tsd-kind-icon">Set<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="stringpredicate.html" class="tsd-kind-icon">String<wbr>Predicate</a>
 		</li>
-		<li class=" tsd-kind-interface">
+		<li class=" tsd-kind-class">
+			<a href="weakmappredicate.html" class="tsd-kind-icon">Weak<wbr>Map<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="weaksetpredicate.html" class="tsd-kind-icon">Weak<wbr>Set<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
+			<a href="../interfaces/collectionlike.html" class="tsd-kind-icon">Collection<wbr>Like</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
 			<a href="../interfaces/ow.html" class="tsd-kind-icon">Ow</a>
 		</li>
 	</ul>
@@ -961,6 +982,12 @@ img { max-width: 100%; }
 				</li>
 			</ul>
 		</section>
+		<section class="tsd-panel">
+			<h3>Implements</h3>
+			<ul class="tsd-hierarchy">
+				<li><span class="tsd-signature-type">BasePredicate</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">Date</span><span class="tsd-signature-symbol">&gt;</span></li>
+			</ul>
+		</section>
 		<section class="tsd-panel-group tsd-index-group">
 			<h2>Index</h2>
 			<section class="tsd-panel tsd-index-panel">
@@ -982,6 +1009,7 @@ img { max-width: 100%; }
 						<ul class="tsd-index-list">
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="datepredicate.html#after" class="tsd-kind-icon">after</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="datepredicate.html#before" class="tsd-kind-icon">before</a></li>
+							<li class="tsd-kind-method tsd-parent-kind-class tsd-is-inherited"><a href="datepredicate.html#is" class="tsd-kind-icon">is</a></li>
 						</ul>
 					</section>
 				</div>
@@ -1000,7 +1028,7 @@ img { max-width: 100%; }
 						<aside class="tsd-sources">
 							<p>Overrides Predicate.__constructor</p>
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/date.ts#L3">lib/predicates/date.ts:3</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/date.ts#L3">lib/predicates/date.ts:3</a></li>
 							</ul>
 						</aside>
 						<h4 class="tsd-parameters-title">Parameters</h4>
@@ -1023,7 +1051,7 @@ img { max-width: 100%; }
 				<aside class="tsd-sources">
 					<p>Inherited from Predicate.not</p>
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/predicate.ts#L50">lib/predicates/predicate.ts:50</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L68">lib/predicates/predicate.ts:68</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1045,7 +1073,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/date.ts#L25">lib/predicates/date.ts:25</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/date.ts#L25">lib/predicates/date.ts:25</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1076,7 +1104,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/date.ts#L13">lib/predicates/date.ts:13</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/date.ts#L13">lib/predicates/date.ts:13</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1097,6 +1125,61 @@ img { max-width: 100%; }
 					</li>
 				</ul>
 			</section>
+			<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+				<a name="is" class="tsd-anchor"></a>
+				<h3>is</h3>
+				<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<li class="tsd-signature tsd-kind-icon">is<span class="tsd-signature-symbol">(</span>fn<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">this</span></li>
+				</ul>
+				<ul class="tsd-descriptions">
+					<li class="tsd-description">
+						<aside class="tsd-sources">
+							<p>Inherited from Predicate.is</p>
+							<ul>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L79">lib/predicates/predicate.ts:79</a></li>
+							</ul>
+						</aside>
+						<div class="tsd-comment tsd-typography">
+							<div class="lead">
+								<p>Test if the value matches a custom validation function. The validation function should return <code>true</code> if the value
+									passes the function. If the function either returns <code>false</code> or a string, the function fails and the string will be
+								used as error message.</p>
+							</div>
+						</div>
+						<h4 class="tsd-parameters-title">Parameters</h4>
+						<ul class="tsd-parameters">
+							<li>
+								<h5>fn: <span class="tsd-signature-type">function</span></h5>
+								<div class="tsd-comment tsd-typography">
+									<p>Validation function.</p>
+								</div>
+								<ul class="tsd-parameters">
+									<li class="tsd-parameter-siganture">
+										<ul class="tsd-signatures tsd-kind-type-literal tsd-is-not-exported">
+											<li class="tsd-signature tsd-kind-icon"><span class="tsd-signature-symbol">(</span>value<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">Date</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">string</span></li>
+										</ul>
+										<ul class="tsd-descriptions">
+											<li class="tsd-description">
+												<h4 class="tsd-parameters-title">Parameters</h4>
+												<ul class="tsd-parameters">
+													<li>
+														<h5>value: <span class="tsd-signature-type">Date</span></h5>
+													</li>
+												</ul>
+												<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span>
+													<span class="tsd-signature-symbol"> | </span>
+													<span class="tsd-signature-type">string</span>
+												</h4>
+											</li>
+										</ul>
+									</li>
+								</ul>
+							</li>
+						</ul>
+						<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4>
+					</li>
+				</ul>
+			</section>
 		</section>
 		<footer>
 			<div class="container">

docs/classes/errorpredicate.html

@@ -951,6 +951,9 @@ img { max-width: 100%; }
 				<li class=" tsd-kind-method tsd-parent-kind-class">
 					<a href="errorpredicate.html#instanceof" class="tsd-kind-icon">instance<wbr>Of</a>
 				</li>
+				<li class=" tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<a href="errorpredicate.html#is" class="tsd-kind-icon">is</a>
+				</li>
 				<li class=" tsd-kind-method tsd-parent-kind-class">
 					<a href="errorpredicate.html#message" class="tsd-kind-icon">message</a>
 				</li>
@@ -962,13 +965,31 @@ img { max-width: 100%; }
 				</li>
 			</ul>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="mappredicate.html" class="tsd-kind-icon">Map<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="numberpredicate.html" class="tsd-kind-icon">Number<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="objectpredicate.html" class="tsd-kind-icon">Object<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="setpredicate.html" class="tsd-kind-icon">Set<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="stringpredicate.html" class="tsd-kind-icon">String<wbr>Predicate</a>
 		</li>
-		<li class=" tsd-kind-interface">
+		<li class=" tsd-kind-class">
+			<a href="weakmappredicate.html" class="tsd-kind-icon">Weak<wbr>Map<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="weaksetpredicate.html" class="tsd-kind-icon">Weak<wbr>Set<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
+			<a href="../interfaces/collectionlike.html" class="tsd-kind-icon">Collection<wbr>Like</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
 			<a href="../interfaces/ow.html" class="tsd-kind-icon">Ow</a>
 		</li>
 	</ul>
@@ -988,6 +1009,12 @@ img { max-width: 100%; }
 				</li>
 			</ul>
 		</section>
+		<section class="tsd-panel">
+			<h3>Implements</h3>
+			<ul class="tsd-hierarchy">
+				<li><span class="tsd-signature-type">BasePredicate</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">Error</span><span class="tsd-signature-symbol">&gt;</span></li>
+			</ul>
+		</section>
 		<section class="tsd-panel-group tsd-index-group">
 			<h2>Index</h2>
 			<section class="tsd-panel tsd-index-panel">
@@ -1015,6 +1042,7 @@ img { max-width: 100%; }
 						<ul class="tsd-index-list">
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="errorpredicate.html#haskeys" class="tsd-kind-icon">has<wbr>Keys</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="errorpredicate.html#instanceof" class="tsd-kind-icon">instance<wbr>Of</a></li>
+							<li class="tsd-kind-method tsd-parent-kind-class tsd-is-inherited"><a href="errorpredicate.html#is" class="tsd-kind-icon">is</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="errorpredicate.html#message" class="tsd-kind-icon">message</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="errorpredicate.html#messageincludes" class="tsd-kind-icon">message<wbr>Includes</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="errorpredicate.html#name" class="tsd-kind-icon">name</a></li>
@@ -1036,7 +1064,7 @@ img { max-width: 100%; }
 						<aside class="tsd-sources">
 							<p>Overrides Predicate.__constructor</p>
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L3">lib/predicates/error.ts:3</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L3">lib/predicates/error.ts:3</a></li>
 							</ul>
 						</aside>
 						<h4 class="tsd-parameters-title">Parameters</h4>
@@ -1058,7 +1086,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">eval<wbr>Error<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L78">lib/predicates/error.ts:78</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L78">lib/predicates/error.ts:78</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1074,7 +1102,7 @@ img { max-width: 100%; }
 				<aside class="tsd-sources">
 					<p>Inherited from Predicate.not</p>
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/predicate.ts#L50">lib/predicates/predicate.ts:50</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L68">lib/predicates/predicate.ts:68</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1089,7 +1117,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">range<wbr>Error<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L85">lib/predicates/error.ts:85</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L85">lib/predicates/error.ts:85</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1104,7 +1132,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">reference<wbr>Error<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L92">lib/predicates/error.ts:92</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L92">lib/predicates/error.ts:92</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1119,7 +1147,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">syntax<wbr>Error<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L99">lib/predicates/error.ts:99</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L99">lib/predicates/error.ts:99</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1134,7 +1162,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">type<wbr>Error<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L71">lib/predicates/error.ts:71</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L71">lib/predicates/error.ts:71</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1149,7 +1177,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">uri<wbr>Error<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L106">lib/predicates/error.ts:106</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L106">lib/predicates/error.ts:106</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1171,7 +1199,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L49">lib/predicates/error.ts:49</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L49">lib/predicates/error.ts:49</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1202,7 +1230,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L61">lib/predicates/error.ts:61</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L61">lib/predicates/error.ts:61</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1223,6 +1251,61 @@ img { max-width: 100%; }
 					</li>
 				</ul>
 			</section>
+			<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+				<a name="is" class="tsd-anchor"></a>
+				<h3>is</h3>
+				<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<li class="tsd-signature tsd-kind-icon">is<span class="tsd-signature-symbol">(</span>fn<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">this</span></li>
+				</ul>
+				<ul class="tsd-descriptions">
+					<li class="tsd-description">
+						<aside class="tsd-sources">
+							<p>Inherited from Predicate.is</p>
+							<ul>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L79">lib/predicates/predicate.ts:79</a></li>
+							</ul>
+						</aside>
+						<div class="tsd-comment tsd-typography">
+							<div class="lead">
+								<p>Test if the value matches a custom validation function. The validation function should return <code>true</code> if the value
+									passes the function. If the function either returns <code>false</code> or a string, the function fails and the string will be
+								used as error message.</p>
+							</div>
+						</div>
+						<h4 class="tsd-parameters-title">Parameters</h4>
+						<ul class="tsd-parameters">
+							<li>
+								<h5>fn: <span class="tsd-signature-type">function</span></h5>
+								<div class="tsd-comment tsd-typography">
+									<p>Validation function.</p>
+								</div>
+								<ul class="tsd-parameters">
+									<li class="tsd-parameter-siganture">
+										<ul class="tsd-signatures tsd-kind-type-literal tsd-is-not-exported">
+											<li class="tsd-signature tsd-kind-icon"><span class="tsd-signature-symbol">(</span>value<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">Error</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">string</span></li>
+										</ul>
+										<ul class="tsd-descriptions">
+											<li class="tsd-description">
+												<h4 class="tsd-parameters-title">Parameters</h4>
+												<ul class="tsd-parameters">
+													<li>
+														<h5>value: <span class="tsd-signature-type">Error</span></h5>
+													</li>
+												</ul>
+												<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span>
+													<span class="tsd-signature-symbol"> | </span>
+													<span class="tsd-signature-type">string</span>
+												</h4>
+											</li>
+										</ul>
+									</li>
+								</ul>
+							</li>
+						</ul>
+						<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4>
+					</li>
+				</ul>
+			</section>
 			<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class">
 				<a name="message" class="tsd-anchor"></a>
 				<h3>message</h3>
@@ -1233,7 +1316,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L25">lib/predicates/error.ts:25</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L25">lib/predicates/error.ts:25</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1264,7 +1347,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L37">lib/predicates/error.ts:37</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L37">lib/predicates/error.ts:37</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1295,7 +1378,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/error.ts#L13">lib/predicates/error.ts:13</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/error.ts#L13">lib/predicates/error.ts:13</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">

docs/classes/numberpredicate.html

@@ -921,6 +921,9 @@ img { max-width: 100%; }
 		<li class=" tsd-kind-class">
 			<a href="errorpredicate.html" class="tsd-kind-icon">Error<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="mappredicate.html" class="tsd-kind-icon">Map<wbr>Predicate</a>
+		</li>
 		<li class="current tsd-kind-class">
 			<a href="numberpredicate.html" class="tsd-kind-icon">Number<wbr>Predicate</a>
 			<ul>
@@ -957,6 +960,9 @@ img { max-width: 100%; }
 				<li class=" tsd-kind-method tsd-parent-kind-class">
 					<a href="numberpredicate.html#inrange" class="tsd-kind-icon">in<wbr>Range</a>
 				</li>
+				<li class=" tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<a href="numberpredicate.html#is" class="tsd-kind-icon">is</a>
+				</li>
 				<li class=" tsd-kind-method tsd-parent-kind-class">
 					<a href="numberpredicate.html#lessthan" class="tsd-kind-icon">less<wbr>Than</a>
 				</li>
@@ -965,10 +971,25 @@ img { max-width: 100%; }
 				</li>
 			</ul>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="objectpredicate.html" class="tsd-kind-icon">Object<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="setpredicate.html" class="tsd-kind-icon">Set<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="stringpredicate.html" class="tsd-kind-icon">String<wbr>Predicate</a>
 		</li>
-		<li class=" tsd-kind-interface">
+		<li class=" tsd-kind-class">
+			<a href="weakmappredicate.html" class="tsd-kind-icon">Weak<wbr>Map<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="weaksetpredicate.html" class="tsd-kind-icon">Weak<wbr>Set<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
+			<a href="../interfaces/collectionlike.html" class="tsd-kind-icon">Collection<wbr>Like</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
 			<a href="../interfaces/ow.html" class="tsd-kind-icon">Ow</a>
 		</li>
 	</ul>
@@ -988,6 +1009,12 @@ img { max-width: 100%; }
 				</li>
 			</ul>
 		</section>
+		<section class="tsd-panel">
+			<h3>Implements</h3>
+			<ul class="tsd-hierarchy">
+				<li><span class="tsd-signature-type">BasePredicate</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">&gt;</span></li>
+			</ul>
+		</section>
 		<section class="tsd-panel-group tsd-index-group">
 			<h2>Index</h2>
 			<section class="tsd-panel tsd-index-panel">
@@ -1016,6 +1043,7 @@ img { max-width: 100%; }
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="numberpredicate.html#greaterthan" class="tsd-kind-icon">greater<wbr>Than</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="numberpredicate.html#greaterthanorequal" class="tsd-kind-icon">greater<wbr>Than<wbr>OrEqual</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="numberpredicate.html#inrange" class="tsd-kind-icon">in<wbr>Range</a></li>
+							<li class="tsd-kind-method tsd-parent-kind-class tsd-is-inherited"><a href="numberpredicate.html#is" class="tsd-kind-icon">is</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="numberpredicate.html#lessthan" class="tsd-kind-icon">less<wbr>Than</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="numberpredicate.html#lessthanorequal" class="tsd-kind-icon">less<wbr>Than<wbr>OrEqual</a></li>
 						</ul>
@@ -1036,7 +1064,7 @@ img { max-width: 100%; }
 						<aside class="tsd-sources">
 							<p>Overrides Predicate.__constructor</p>
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L4">lib/predicates/number.ts:4</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L4">lib/predicates/number.ts:4</a></li>
 							</ul>
 						</aside>
 						<h4 class="tsd-parameters-title">Parameters</h4>
@@ -1058,7 +1086,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">finite<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L95">lib/predicates/number.ts:95</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L95">lib/predicates/number.ts:95</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1073,7 +1101,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">infinite<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L105">lib/predicates/number.ts:105</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L105">lib/predicates/number.ts:105</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1088,7 +1116,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">integer<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L85">lib/predicates/number.ts:85</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L85">lib/predicates/number.ts:85</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1103,7 +1131,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">negative<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L125">lib/predicates/number.ts:125</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L125">lib/predicates/number.ts:125</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1119,7 +1147,7 @@ img { max-width: 100%; }
 				<aside class="tsd-sources">
 					<p>Inherited from Predicate.not</p>
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/predicate.ts#L50">lib/predicates/predicate.ts:50</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L68">lib/predicates/predicate.ts:68</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1134,7 +1162,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">positive<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L115">lib/predicates/number.ts:115</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L115">lib/predicates/number.ts:115</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1156,7 +1184,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L75">lib/predicates/number.ts:75</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L75">lib/predicates/number.ts:75</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1187,7 +1215,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L27">lib/predicates/number.ts:27</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L27">lib/predicates/number.ts:27</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1218,7 +1246,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L39">lib/predicates/number.ts:39</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L39">lib/predicates/number.ts:39</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1249,7 +1277,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L15">lib/predicates/number.ts:15</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L15">lib/predicates/number.ts:15</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1276,6 +1304,61 @@ img { max-width: 100%; }
 					</li>
 				</ul>
 			</section>
+			<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+				<a name="is" class="tsd-anchor"></a>
+				<h3>is</h3>
+				<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<li class="tsd-signature tsd-kind-icon">is<span class="tsd-signature-symbol">(</span>fn<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">this</span></li>
+				</ul>
+				<ul class="tsd-descriptions">
+					<li class="tsd-description">
+						<aside class="tsd-sources">
+							<p>Inherited from Predicate.is</p>
+							<ul>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L79">lib/predicates/predicate.ts:79</a></li>
+							</ul>
+						</aside>
+						<div class="tsd-comment tsd-typography">
+							<div class="lead">
+								<p>Test if the value matches a custom validation function. The validation function should return <code>true</code> if the value
+									passes the function. If the function either returns <code>false</code> or a string, the function fails and the string will be
+								used as error message.</p>
+							</div>
+						</div>
+						<h4 class="tsd-parameters-title">Parameters</h4>
+						<ul class="tsd-parameters">
+							<li>
+								<h5>fn: <span class="tsd-signature-type">function</span></h5>
+								<div class="tsd-comment tsd-typography">
+									<p>Validation function.</p>
+								</div>
+								<ul class="tsd-parameters">
+									<li class="tsd-parameter-siganture">
+										<ul class="tsd-signatures tsd-kind-type-literal tsd-is-not-exported">
+											<li class="tsd-signature tsd-kind-icon"><span class="tsd-signature-symbol">(</span>value<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">number</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">string</span></li>
+										</ul>
+										<ul class="tsd-descriptions">
+											<li class="tsd-description">
+												<h4 class="tsd-parameters-title">Parameters</h4>
+												<ul class="tsd-parameters">
+													<li>
+														<h5>value: <span class="tsd-signature-type">number</span></h5>
+													</li>
+												</ul>
+												<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span>
+													<span class="tsd-signature-symbol"> | </span>
+													<span class="tsd-signature-type">string</span>
+												</h4>
+											</li>
+										</ul>
+									</li>
+								</ul>
+							</li>
+						</ul>
+						<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4>
+					</li>
+				</ul>
+			</section>
 			<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class">
 				<a name="lessthan" class="tsd-anchor"></a>
 				<h3>less<wbr>Than</h3>
@@ -1286,7 +1369,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L51">lib/predicates/number.ts:51</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L51">lib/predicates/number.ts:51</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1317,7 +1400,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/number.ts#L63">lib/predicates/number.ts:63</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/number.ts#L63">lib/predicates/number.ts:63</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">

docs/classes/stringpredicate.html

@@ -921,9 +921,18 @@ img { max-width: 100%; }
 		<li class=" tsd-kind-class">
 			<a href="errorpredicate.html" class="tsd-kind-icon">Error<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="mappredicate.html" class="tsd-kind-icon">Map<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="numberpredicate.html" class="tsd-kind-icon">Number<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="objectpredicate.html" class="tsd-kind-icon">Object<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="setpredicate.html" class="tsd-kind-icon">Set<wbr>Predicate</a>
+		</li>
 		<li class="current tsd-kind-class">
 			<a href="stringpredicate.html" class="tsd-kind-icon">String<wbr>Predicate</a>
 			<ul>
@@ -957,6 +966,9 @@ img { max-width: 100%; }
 				<li class=" tsd-kind-method tsd-parent-kind-class">
 					<a href="stringpredicate.html#includes" class="tsd-kind-icon">includes</a>
 				</li>
+				<li class=" tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<a href="stringpredicate.html#is" class="tsd-kind-icon">is</a>
+				</li>
 				<li class=" tsd-kind-method tsd-parent-kind-class">
 					<a href="stringpredicate.html#length" class="tsd-kind-icon">length</a>
 				</li>
@@ -974,7 +986,16 @@ img { max-width: 100%; }
 				</li>
 			</ul>
 		</li>
-		<li class=" tsd-kind-interface">
+		<li class=" tsd-kind-class">
+			<a href="weakmappredicate.html" class="tsd-kind-icon">Weak<wbr>Map<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="weaksetpredicate.html" class="tsd-kind-icon">Weak<wbr>Set<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
+			<a href="../interfaces/collectionlike.html" class="tsd-kind-icon">Collection<wbr>Like</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
 			<a href="../interfaces/ow.html" class="tsd-kind-icon">Ow</a>
 		</li>
 	</ul>
@@ -994,6 +1015,12 @@ img { max-width: 100%; }
 				</li>
 			</ul>
 		</section>
+		<section class="tsd-panel">
+			<h3>Implements</h3>
+			<ul class="tsd-hierarchy">
+				<li><span class="tsd-signature-type">BasePredicate</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">&gt;</span></li>
+			</ul>
+		</section>
 		<section class="tsd-panel-group tsd-index-group">
 			<h2>Index</h2>
 			<section class="tsd-panel tsd-index-panel">
@@ -1021,6 +1048,7 @@ img { max-width: 100%; }
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="stringpredicate.html#endswith" class="tsd-kind-icon">ends<wbr>With</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="stringpredicate.html#equals" class="tsd-kind-icon">equals</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="stringpredicate.html#includes" class="tsd-kind-icon">includes</a></li>
+							<li class="tsd-kind-method tsd-parent-kind-class tsd-is-inherited"><a href="stringpredicate.html#is" class="tsd-kind-icon">is</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="stringpredicate.html#length" class="tsd-kind-icon">length</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="stringpredicate.html#matches" class="tsd-kind-icon">matches</a></li>
 							<li class="tsd-kind-method tsd-parent-kind-class"><a href="stringpredicate.html#maxlength" class="tsd-kind-icon">max<wbr>Length</a></li>
@@ -1044,7 +1072,7 @@ img { max-width: 100%; }
 						<aside class="tsd-sources">
 							<p>Overrides Predicate.__constructor</p>
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L4">lib/predicates/string.ts:4</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L4">lib/predicates/string.ts:4</a></li>
 							</ul>
 						</aside>
 						<h4 class="tsd-parameters-title">Parameters</h4>
@@ -1066,7 +1094,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">alphanumeric<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L128">lib/predicates/string.ts:128</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L128">lib/predicates/string.ts:128</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1081,7 +1109,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">date<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L148">lib/predicates/string.ts:148</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L148">lib/predicates/string.ts:148</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1096,7 +1124,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">empty<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L96">lib/predicates/string.ts:96</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L96">lib/predicates/string.ts:96</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1111,7 +1139,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">non<wbr>Empty<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L106">lib/predicates/string.ts:106</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L106">lib/predicates/string.ts:106</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1127,7 +1155,7 @@ img { max-width: 100%; }
 				<aside class="tsd-sources">
 					<p>Inherited from Predicate.not</p>
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/predicate.ts#L50">lib/predicates/predicate.ts:50</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L68">lib/predicates/predicate.ts:68</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1142,7 +1170,7 @@ img { max-width: 100%; }
 				<div class="tsd-signature tsd-kind-icon">numeric<span class="tsd-signature-symbol">:</span> </div>
 				<aside class="tsd-sources">
 					<ul>
-						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L138">lib/predicates/string.ts:138</a></li>
+						<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L138">lib/predicates/string.ts:138</a></li>
 					</ul>
 				</aside>
 				<div class="tsd-comment tsd-typography">
@@ -1164,7 +1192,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L74">lib/predicates/string.ts:74</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L74">lib/predicates/string.ts:74</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1195,7 +1223,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L118">lib/predicates/string.ts:118</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L118">lib/predicates/string.ts:118</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1226,7 +1254,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L86">lib/predicates/string.ts:86</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L86">lib/predicates/string.ts:86</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1247,6 +1275,61 @@ img { max-width: 100%; }
 					</li>
 				</ul>
 			</section>
+			<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+				<a name="is" class="tsd-anchor"></a>
+				<h3>is</h3>
+				<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class tsd-is-inherited">
+					<li class="tsd-signature tsd-kind-icon">is<span class="tsd-signature-symbol">(</span>fn<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">function</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">this</span></li>
+				</ul>
+				<ul class="tsd-descriptions">
+					<li class="tsd-description">
+						<aside class="tsd-sources">
+							<p>Inherited from Predicate.is</p>
+							<ul>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/predicate.ts#L79">lib/predicates/predicate.ts:79</a></li>
+							</ul>
+						</aside>
+						<div class="tsd-comment tsd-typography">
+							<div class="lead">
+								<p>Test if the value matches a custom validation function. The validation function should return <code>true</code> if the value
+									passes the function. If the function either returns <code>false</code> or a string, the function fails and the string will be
+								used as error message.</p>
+							</div>
+						</div>
+						<h4 class="tsd-parameters-title">Parameters</h4>
+						<ul class="tsd-parameters">
+							<li>
+								<h5>fn: <span class="tsd-signature-type">function</span></h5>
+								<div class="tsd-comment tsd-typography">
+									<p>Validation function.</p>
+								</div>
+								<ul class="tsd-parameters">
+									<li class="tsd-parameter-siganture">
+										<ul class="tsd-signatures tsd-kind-type-literal tsd-is-not-exported">
+											<li class="tsd-signature tsd-kind-icon"><span class="tsd-signature-symbol">(</span>value<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">string</span></li>
+										</ul>
+										<ul class="tsd-descriptions">
+											<li class="tsd-description">
+												<h4 class="tsd-parameters-title">Parameters</h4>
+												<ul class="tsd-parameters">
+													<li>
+														<h5>value: <span class="tsd-signature-type">string</span></h5>
+													</li>
+												</ul>
+												<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span>
+													<span class="tsd-signature-symbol"> | </span>
+													<span class="tsd-signature-type">string</span>
+												</h4>
+											</li>
+										</ul>
+									</li>
+								</ul>
+							</li>
+						</ul>
+						<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">this</span></h4>
+					</li>
+				</ul>
+			</section>
 			<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class">
 				<a name="length" class="tsd-anchor"></a>
 				<h3>length</h3>
@@ -1257,7 +1340,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L14">lib/predicates/string.ts:14</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L14">lib/predicates/string.ts:14</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1288,7 +1371,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L50">lib/predicates/string.ts:50</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L50">lib/predicates/string.ts:50</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1316,7 +1399,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L38">lib/predicates/string.ts:38</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L38">lib/predicates/string.ts:38</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1347,7 +1430,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L26">lib/predicates/string.ts:26</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L26">lib/predicates/string.ts:26</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">
@@ -1378,7 +1461,7 @@ img { max-width: 100%; }
 					<li class="tsd-description">
 						<aside class="tsd-sources">
 							<ul>
-								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/45aa3cf/source/lib/predicates/string.ts#L62">lib/predicates/string.ts:62</a></li>
+								<li>Defined in <a href="https://github.com/sindresorhus/ow/blob/766281c/source/lib/predicates/string.ts#L62">lib/predicates/string.ts:62</a></li>
 							</ul>
 						</aside>
 						<div class="tsd-comment tsd-typography">

docs/index.html

@@ -921,13 +921,31 @@ img { max-width: 100%; }
 		<li class=" tsd-kind-class">
 			<a href="classes/errorpredicate.html" class="tsd-kind-icon">Error<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="classes/mappredicate.html" class="tsd-kind-icon">Map<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="classes/numberpredicate.html" class="tsd-kind-icon">Number<wbr>Predicate</a>
 		</li>
+		<li class=" tsd-kind-class">
+			<a href="classes/objectpredicate.html" class="tsd-kind-icon">Object<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="classes/setpredicate.html" class="tsd-kind-icon">Set<wbr>Predicate</a>
+		</li>
 		<li class=" tsd-kind-class">
 			<a href="classes/stringpredicate.html" class="tsd-kind-icon">String<wbr>Predicate</a>
 		</li>
-		<li class=" tsd-kind-interface">
+		<li class=" tsd-kind-class">
+			<a href="classes/weakmappredicate.html" class="tsd-kind-icon">Weak<wbr>Map<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-class">
+			<a href="classes/weaksetpredicate.html" class="tsd-kind-icon">Weak<wbr>Set<wbr>Predicate</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
+			<a href="interfaces/collectionlike.html" class="tsd-kind-icon">Collection<wbr>Like</a>
+		</li>
+		<li class=" tsd-kind-interface tsd-has-type-parameter">
 			<a href="interfaces/ow.html" class="tsd-kind-icon">Ow</a>
 		</li>
 	</ul>
@@ -945,14 +963,20 @@ img { max-width: 100%; }
 							<li class="tsd-kind-class"><a href="classes/booleanpredicate.html" class="tsd-kind-icon">Boolean<wbr>Predicate</a></li>
 							<li class="tsd-kind-class"><a href="classes/datepredicate.html" class="tsd-kind-icon">Date<wbr>Predicate</a></li>
 							<li class="tsd-kind-class"><a href="classes/errorpredicate.html" class="tsd-kind-icon">Error<wbr>Predicate</a></li>
+							<li class="tsd-kind-class"><a href="classes/mappredicate.html" class="tsd-kind-icon">Map<wbr>Predicate</a></li>
 							<li class="tsd-kind-class"><a href="classes/numberpredicate.html" class="tsd-kind-icon">Number<wbr>Predicate</a></li>
+							<li class="tsd-kind-class"><a href="classes/objectpredicate.html" class="tsd-kind-icon">Object<wbr>Predicate</a></li>
+							<li class="tsd-kind-class"><a href="classes/setpredicate.html" class="tsd-kind-icon">Set<wbr>Predicate</a></li>
 							<li class="tsd-kind-class"><a href="classes/stringpredicate.html" class="tsd-kind-icon">String<wbr>Predicate</a></li>
+							<li class="tsd-kind-class"><a href="classes/weakmappredicate.html" class="tsd-kind-icon">Weak<wbr>Map<wbr>Predicate</a></li>
+							<li class="tsd-kind-class"><a href="classes/weaksetpredicate.html" class="tsd-kind-icon">Weak<wbr>Set<wbr>Predicate</a></li>
 						</ul>
 					</section>
 					<section class="tsd-index-section ">
 						<h3>Interfaces</h3>
 						<ul class="tsd-index-list">
-							<li class="tsd-kind-interface"><a href="interfaces/ow.html" class="tsd-kind-icon">Ow</a></li>
+							<li class="tsd-kind-interface tsd-has-type-parameter"><a href="interfaces/collectionlike.html" class="tsd-kind-icon">Collection<wbr>Like</a></li>
+							<li class="tsd-kind-interface tsd-has-type-parameter"><a href="interfaces/ow.html" class="tsd-kind-icon">Ow</a></li>
 						</ul>
 					</section>
 				</div>

package.json

@@ -55,7 +55,7 @@
 		"@types/vali-date": "^1.0.0",
 		"add-module-exports-webpack-plugin": "^0.1.0",
 		"ava": "*",
-		"awesome-typescript-loader": "^3.2.3",
+		"awesome-typescript-loader": "^4.0.1",
 		"codecov": "^3.0.0",
 		"del-cli": "^1.1.0",
 		"dot-prop": "^4.2.0",
@@ -63,11 +63,12 @@
 		"lodash.isequal": "^4.5.0",
 		"nyc": "^11.2.1",
 		"tslint": "^5.9.1",
-		"tslint-xo": "^0.6.0",
+		"tslint-xo": "^0.7.0",
-		"typedoc": "^0.9.0",
+		"typedoc": "^0.11.1",
-		"typescript": "^2.7.0",
+		"typescript": "^2.8.1",
 		"vali-date": "^1.0.0",
-		"webpack": "^3.8.1"
+		"webpack": "^4.3.0",
+		"webpack-cli": "^2.0.13"
 	},
 	"typings": "dist/index.d.ts",
 	"nyc": {

source/lib/predicates/any.ts

@@ -11,6 +11,7 @@ export class AnyPredicate<T> implements BasePredicate<T> {
 		private readonly predicates: Predicate[]
 	) {}
 
+	// tslint:disable completed-docs
 	[testSymbol](value: T, main: Ow) {
 		const errors = [
 			'Any predicate failed with the following errors:'

source/lib/predicates/predicate.ts

@@ -43,6 +43,7 @@ export class Predicate<T = any> implements BasePredicate<T> {
 	/**
 	 * @hidden
 	 */
+	// tslint:disable completed-docs
 	[testSymbol](value: T, main: Ow) {
 		for (const {validator, message} of this.context.validators) {
 			const result = validator(value);

source/lib/predicates/string.ts

@@ -1,4 +1,4 @@
-import * as valiDate from 'vali-date';
+import valiDate from 'vali-date';
 import {Predicate, Context} from './predicate';
 
 export class StringPredicate extends Predicate<string> {

source/test/any.ts

@@ -6,7 +6,7 @@ const createError = (...errors: string[]) => {
 		'Any predicate failed with the following errors:',
 		...errors.map(error => `- ${error}`)
 	].join('\n');
-}
+};
 
 test('any', t => {
 	t.notThrows(() => m(1, m.any(m.number)));

tsconfig.json

@@ -20,7 +20,8 @@
 		"strictNullChecks": true,
 		"strictFunctionTypes": true,
 		"strictPropertyInitialization": true,
-		"alwaysStrict": true
+		"alwaysStrict": true,
+		"esModuleInterop": true
 	},
 	"exclude": [
 		"node_modules",
@@ -31,7 +32,7 @@
 		// Links to `ArrayPredicate` and others doesn't work when this is specified...
 		// "entryPoint": "Ow",
 		"mode": "file",
-		"target": "ES5",
+		"target": "ES6",
 		"module": "commonjs",
 		"moduleResolution": "node",
 		"exclude": "source/test",

tslint.json

@@ -1,6 +1,20 @@
 {
 	"extends": "tslint-xo",
 	"rules": {
-		"completed-docs": [true, "methods"]
+		"completed-docs": [
+			true,
+			{
+				"methods": {
+					"privacies": [
+						"public"
+					]
+				},
+				"functions": {
+					"visibilities": [
+						"exported"
+					]
+				}
+			}
+		]
 	}
 }

webpack.config.js

@@ -4,6 +4,7 @@ const license = require('license-webpack-plugin');
 const AddModuleExportsPlugin = require('add-module-exports-webpack-plugin');
 
 module.exports = {
+	mode: 'production',
 	entry: './source/index.ts',
 	target: 'node',
 	node: false,
@@ -13,10 +14,12 @@ module.exports = {
 		libraryTarget: 'commonjs2'
 	},
 	resolve: {
-		extensions: ['.ts', '.js']
+		extensions: [
+			'.ts',
+			'.js'
+		]
 	},
 	plugins: [
-		new webpack.optimize.ModuleConcatenationPlugin(),
 		new AddModuleExportsPlugin(),
 		new license.LicenseWebpackPlugin({
 			pattern: /.*/,