Feat: empty namespaces

Originally authored by https://github.com/vitormv in fdc9acbff6

Signed-off-by: Jytesh <44925963+Jytesh@users.noreply.github.com>

packages/keyv/src/index.js

@@ -54,7 +54,7 @@ class Keyv extends EventEmitter {
 	}
 
 	_getKeyPrefix(key) {
-		return `${this.options.namespace}:${key}`;
+		return this.opts.namespace ? `${this.opts.namespace}:${key}` : key;
 	}
 
 	_getKeyUnprefix(key) {

packages/keyv/test/keyv.js

@@ -124,5 +124,26 @@ test.serial('Keyv supports async serializer/deserializer', async t => {
 	t.is(await keyv.get('foo'), 'bar');
 });
 
+test.serial('Keyv uses a default namespace', async t => {
+	const store = new Map();
+	const keyv = new Keyv({ store });
+	await keyv.set('foo', 'bar');
+	t.is([...store.keys()][0], 'keyv:foo');
+});
+
+test.serial('Default namespace can be overridden', async t => {
+	const store = new Map();
+	const keyv = new Keyv({ store, namespace: 'magic' });
+	await keyv.set('foo', 'bar');
+	t.is([...store.keys()][0], 'magic:foo');
+});
+
+test.serial('An empty namespace stores the key as-is', async t => {
+	const store = new Map();
+	const keyv = new Keyv({ store, namespace: '' });
+	await keyv.set(42, 'foo');
+	t.is([...store.keys()][0], 42);
+});
+
 const store = () => new Map();
 keyvTestSuite(test, Keyv, store);