Code Inspection: Unneeded last comma in array literal

Reports when a trailing comma is used in array literals.

The warning is reported only when the JavaScript language version is set to JavaScript 1.8.5, ECMAScript 3 or 5.1.

Trailing commas in arrays are allowed according to these specifications, however, some browsers might throw an error when a trailing comma is used.

You can configure formatting options for trailing commas in Code Style | JavaScript or TypeScript | Punctuation.