See #524, #534. Add end_with_comma option to JavaScript using Pretty Diff

docs/options.md

@@ -1440,6 +1440,30 @@ End output with newline (Supported by JS Beautify)
 }
 ```
 
+####  [JavaScript - End with comma](#javascript---end-with-comma) 
+
+**Namespace**: `js`
+
+**Key**: `end_with_comma`
+
+**Type**: `boolean`
+
+**Supported Beautifiers**:  [`JS Beautify`](#js-beautify)  [`Pretty Diff`](#pretty-diff) 
+
+**Description**:
+
+If a terminating comma should be inserted into arrays, object literals, and destructured objects. (Supported by JS Beautify, Pretty Diff)
+
+**Example `.jsbeautifyrc` Configuration**
+
+```json
+{
+    "js": {
+        "end_with_comma": false
+    }
+}
+```
+
 ####  [Objective-C - Config Path](#objective-c---config-path) 
 
 **Namespace**: `objectivec`
@@ -5386,6 +5410,30 @@ End output with newline (Supported by JS Beautify)
 }
 ```
 
+####  [JavaScript - End with comma](#javascript---end-with-comma) 
+
+**Namespace**: `js`
+
+**Key**: `end_with_comma`
+
+**Type**: `boolean`
+
+**Supported Beautifiers**:  [`JS Beautify`](#js-beautify)  [`Pretty Diff`](#pretty-diff) 
+
+**Description**:
+
+If a terminating comma should be inserted into arrays, object literals, and destructured objects. (Supported by JS Beautify, Pretty Diff)
+
+**Example `.jsbeautifyrc` Configuration**
+
+```json
+{
+    "js": {
+        "end_with_comma": false
+    }
+}
+```
+
 
 ### Pretty Diff
 
@@ -5869,6 +5917,30 @@ Wrap lines at next opportunity after N characters (Supported by JS Beautify, Pre
 }
 ```
 
+####  [JavaScript - End with comma](#javascript---end-with-comma) 
+
+**Namespace**: `js`
+
+**Key**: `end_with_comma`
+
+**Type**: `boolean`
+
+**Supported Beautifiers**:  [`JS Beautify`](#js-beautify)  [`Pretty Diff`](#pretty-diff) 
+
+**Description**:
+
+If a terminating comma should be inserted into arrays, object literals, and destructured objects. (Supported by JS Beautify, Pretty Diff)
+
+**Example `.jsbeautifyrc` Configuration**
+
+```json
+{
+    "js": {
+        "end_with_comma": false
+    }
+}
+```
+
 
 ### Gherkin formatter
 

src/beautifiers/prettydiff.coffee

@@ -28,6 +28,7 @@ module.exports = class PrettyDiff extends Beautifier
       wrap: "wrap_line_length"
       space: "space_after_anon_function"
       noleadzero: "no_lead_zero"
+      endcomma: "end_with_comma"
     # Apply language-specific options
     CSV: true
     ERB: true

src/languages/javascript.coffee

@@ -106,5 +106,10 @@ module.exports = {
       type: 'boolean'
       default: false
       description: "End output with newline"
+    end_with_comma:
+      type: 'boolean'
+      default: false
+      description: "If a terminating comma should be inserted into \
+                  arrays, object literals, and destructured objects."
 
 }