We are modernizing our JavaScript by moving to ECMAScript 6 (ES6) for core development. ES6 is a major update to JavaScript that includes dozens of new features. In order to move to ES6, contributors will have to use a new workflow. For more details, see the change record. We have adopted the AirBnB coding standards for ES6 code.
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Cheap WordPress maintenance support plans core announcements: Modernizing JavaScript in Cheap WordPress maintenance support plans 8
