Es3 Compatibility

String.prototype.startsWithJavaScript

A robust and optimized ES3-compatible polyfill for the ECMAScript 6 String.prototype.startsWith method.

defsJavaScript

Static scope analysis and transpilation of ES6 block-scoped const and let variables to ES3 var.

String.prototype.endsWithJavaScript

An ES3-compatible polyfill for the String.prototype.endsWith method from ECMAScript 6.

array.prototype.everyJavaScript

A spec-compliant polyfill for Array.prototype.every that works in ES3+ environments.