Fix #318

node_modules/mime/Mime.js

+'use strict';
+
+/**
+ * @param typeMap [Object] Map of MIME type -> Array[extensions]
+ * @param ...
+ */
+function Mime() {
+  this._types = Object.create(null);
+  this._extensions = Object.create(null);
+
+  for (let i = 0; i < arguments.length; i++) {
+    this.define(arguments[i]);
+  }
+
+  this.define = this.define.bind(this);
+  this.getType = this.getType.bind(this);
+  this.getExtension = this.getExtension.bind(this);
+}
+
+/**
+ * Define mimetype -> extension mappings.  Each key is a mime-type that maps
+ * to an array of extensions associated with the type.  The first extension is
+ * used as the default extension for the type.
+ *
+ * e.g. mime.define({'audio/ogg', ['oga', 'ogg', 'spx']});
+ *
+ * If a type declares an extension that has already been defined, an error will
+ * be thrown.  To suppress this error and force the extension to be associated
+ * with the new type, pass `force`=true.  Alternatively, you may prefix the
+ * extension with "*" to map the type to extension, without mapping the
+ * extension to the type.
+ *
+ * e.g. mime.define({'audio/wav', ['wav']}, {'audio/x-wav', ['*wav']});
+ *
+ *
+ * @param map (Object) type definitions
+ * @param force (Boolean) if true, force overriding of existing definitions
+ */
+Mime.prototype.define = function(typeMap, force) {
+  for (let type in typeMap) {
+    let extensions = typeMap[type].map(function(t) {
+      return t.toLowerCase();
+    });
+    type = type.toLowerCase();
+
+    for (let i = 0; i < extensions.length; i++) {
+      const ext = extensions[i];
+
+      // '*' prefix = not the preferred type for this extension.  So fixup the
+      // extension, and skip it.
+      if (ext[0] === '*') {
+        continue;
+      }
+
+      if (!force && (ext in this._types)) {
+        throw new Error(
+          'Attempt to change mapping for "' + ext +
+          '" extension from "' + this._types[ext] + '" to "' + type +
+          '". Pass `force=true` to allow this, otherwise remove "' + ext +
+          '" from the list of extensions for "' + type + '".'
+        );
+      }
+
+      this._types[ext] = type;
+    }
+
+    // Use first extension as default
+    if (force || !this._extensions[type]) {
+      const ext = extensions[0];
+      this._extensions[type] = (ext[0] !== '*') ? ext : ext.substr(1);
+    }
+  }
+};
+
+/**
+ * Lookup a mime type based on extension
+ */
+Mime.prototype.getType = function(path) {
+  path = String(path);
+  let last = path.replace(/^.*[/\\]/, '').toLowerCase();
+  let ext = last.replace(/^.*\./, '').toLowerCase();
+
+  let hasPath = last.length < path.length;
+  let hasDot = ext.length < last.length - 1;
+
+  return (hasDot || !hasPath) && this._types[ext] || null;
+};
+
+/**
+ * Return file extension associated with a mime type
+ */
+Mime.prototype.getExtension = function(type) {
+  type = /^\s*([^;\s]*)/.test(type) && RegExp.$1;
+  return type && this._extensions[type.toLowerCase()] || null;
+};
+
+module.exports = Mime;