Extention and ES6 support

HISTORY.md

@@ -1,5 +1,5 @@
-unreleased
-==========
+1.52.1 / 2024-02-21
+===================
 
   * Add extension `.sql` to `application/sql`
   * Add extensions `.aac` and `.adts` to `audio/aac`

README.md

@@ -38,13 +38,18 @@ https://cdn.jsdelivr.net/gh/jshttp/mime-db@master/db.json
 var db = require('mime-db')
 
 // grab data on .js files
-var data = db['application/javascript']
+var data = db['application/javascript'];
+
+// grab mime types for extension
+var type = db.extension['js'];
 ```
 
 ## Data Structure
 
-The JSON file is a map lookup for lowercased mime types.
-Each mime type has the following properties:
+### db.json
+
+The JSON file is a map lookup for lower-cased mime types. Each mime type has
+the following properties:
 
 - `.source` - where the mime type is defined.
     If not set, it's probably a custom media type.
@@ -57,6 +62,12 @@ Each mime type has the following properties:
 
 If unknown, every property could be `undefined`.
 
+### db-ext.json
+
+The JSON file is a map lookup for lower-cased file extensions. Each file
+extension is an array with the list of lower-cased mime types in order of
+preference.
+
 ## Contributing
 
 The primary way to contribute to this database is by updating the data in