<ul><li><code>1.2.3</code> A specific version. When nothing else will do. Note that
build metadata is still ignored, so <code>1.2.3+build2012</code> will satisfy
this range.</li><li><code>>1.2.3</code> Greater than a specific version.</li><li><code><1.2.3</code> Less than a specific version. If there is no prerelease
tag on the version range, then no prerelease version will be allowed
either, even though these are technically "less than".</li><li><code>>=1.2.3</code> Greater than or equal to. Note that prerelease versions
are NOT equal to their "normal" equivalents, so <code>1.2.3-beta</code> will
not satisfy this range, but <code>2.3.0-beta</code> will.</li><li><code><=1.2.3</code> Less than or equal to. In this case, prerelease versions
ARE allowed, so <code>1.2.3-beta</code> would satisfy.</li><li><code>1.2.3 - 2.3.4</code> := <code>>=1.2.3 <=2.3.4</code></li><li><code>~1.2.3</code> := <code>>=1.2.3-0 <1.3.0-0</code>"Reasonably close to 1.2.3". When
using tilde operators, prerelease versions are supported as well,
but a prerelease of the next significant digit will NOT be
satisfactory, so <code>1.3.0-beta</code> will not satisfy <code>~1.2.3</code>.</li><li><code>~1.2</code> := <code>>=1.2.0-0 <1.3.0-0</code>"Any version starting with 1.2"</li><li><code>1.2.x</code> := <code>>=1.2.0-0 <1.3.0-0</code>"Any version starting with 1.2"</li><li><code>~1</code> := <code>>=1.0.0-0 <2.0.0-0</code>"Any version starting with 1"</li><li><code>1.x</code> := <code>>=1.0.0-0 <2.0.0-0</code>"Any version starting with 1"</li></ul>
<ul><li>valid(v): Return the parsed version, or null if it's not valid.</li><li>inc(v, release): Return the version incremented by the release type
<ul><li>gt(v1, v2): <code>v1 > v2</code></li><li>gte(v1, v2): <code>v1 >= v2</code></li><li>lt(v1, v2): <code>v1 < v2</code></li><li>lte(v1, v2): <code>v1 <= v2</code></li><li>eq(v1, v2): <code>v1 == v2</code> This is true if they're logically equivalent,
even if they're not the exact same string. You already know how to
compare strings.</li><li>neq(v1, v2): <code>v1 != v2</code> The opposite of eq.</li><li>cmp(v1, comparator, v2): Pass in a comparison string, and it'll call
the corresponding function above. <code>"==="</code> and <code>"!=="</code> do simple
<ul><li>validRange(range): Return the valid range or null if it's not valid</li><li>satisfies(version, range): Return true if the version satisfies the
