Remove Underscore.js dependency.

Author: Eric Koleda

gulpfile.js

@@ -15,9 +15,6 @@ gulp.task('dist', ['clean'], function() {
       .pipe(concat('OAuth1.gs'))
       .pipe(expose('this', 'OAuth1'))
       .pipe(gulp.dest('dist'));
-  gulp.src('node_modules/underscore/underscore.js')
-      .pipe(rename('Underscore.gs'))
-      .pipe(gulp.dest('dist'));
 });
 
 gulp.task('clean', function() {

package-lock.json

@@ -25,9 +25,6 @@
     "gulp-strip-line": "0.0.1",
     "jshint-stylish": "^2.0.1"
   },
-  "dependencies": {
-    "underscore": "^1.8.3"
-  },
   "scripts": {
     "postversion": "gulp dist",
     "dist": "gulp dist",

package.json

@@ -32,7 +32,7 @@ MemoryProperties.prototype.getKeys = function() {
  * @see {@link https://developers.google.com/apps-script/reference/properties/properties#getproperties}
  */
 MemoryProperties.prototype.getProperties = function() {
-  return _.clone(this.properties);
+  return extend_({}, this.properties);
 };
 
 /**

src/MemoryProperties.gs

@@ -17,10 +17,6 @@
  * required setup.
  */
 
-// Load the Underscore.js library. This library was added using the script ID
-// "1I21uLOwDKdyF3_W_hvh6WXiIKWJWno8yG9lB8lf1VBnZFQ6jAAhyNTRG".
-var _ = Underscore.load();
-
 /**
  * Creates a new OAuth1 service with the name specified. It's usually best to
  * create and configure your service once at the start of your script, and then

src/OAuth1.gs

@@ -430,14 +430,15 @@ Service_.prototype.fetchInternal_ = function(url, params, opt_token,
   }
   switch (this.paramLocation_) {
     case 'auth-header':
-      params.headers = _.extend({}, params.headers,
-          signer.toHeader(oauthParams));
+      params.headers =
+        extend_(params.headers || {}, signer.toHeader(oauthParams));
       break;
     case 'uri-query':
       url = buildUrl_(url, oauthParams);
       break;
     case 'post-body':
-      params.payload = _.extend({}, params.payload, oauthParams);
+      params.payload =
+        extend_(params.payload || {}, oauthParams);
       break;
     default:
       throw 'Unknown param location: ' + this.paramLocation_;

src/Service.gs

@@ -32,30 +32,40 @@ function buildUrl_(url, params) {
 
 /**
  * Validates that all of the values in the object are non-empty. If an empty
- * value is found, an error is thrown using the key as the name.
+ * value is found, and error is thrown using the key as the name.
  * @param {Object.<string, string>} params The values to validate.
  * @private
  */
 function validate_(params) {
   Object.keys(params).forEach(function(name) {
     var value = params[name];
-    if (isEmpty_(value)) {
-      throw Utilities.formatString('%s is required.', name);
+    if (!value) {
+      throw new Error(name + ' is required.');
     }
   });
 }
 
 /**
- * Returns true if the given value is empty, false otherwise. An empty value
- * is one of null, undefined, a zero-length string, a zero-length array or an
- * object with no keys.
- * @param {?} value The value to test.
- * @returns {boolean} True if the value is empty, false otherwise.
+ * Copy all of the properties in the source objects over to the
+ * destination object, and return the destination object.
+ * @param {Object} destination The combined object.
+ * @param {Object} source The object who's properties are copied to the
+ *     destination.
+ * @returns {Object} A combined object with the desination and source
+ *     properties.
  * @private
+ * @see http://underscorejs.org/#extend
  */
-function isEmpty_(value) {
-  return value === null || value === undefined ||
-      ((_.isObject(value) || _.isString(value)) && _.isEmpty(value));
+function extend_(destination, source) {
+  // Use Object.assign from the v8 engine, if available.
+  if (Object.assign) {
+    return Object.assign(destination, source);
+  }
+  var keys = Object.keys(source);
+  for (var i = 0; i < keys.length; ++i) {
+    destination[keys[i]] = source[keys[i]];
+  }
+  return destination;
 }
 
 /**