javascript polyfill js es6 commonjs es2015 engine proposal promise namespace livescript dict ponyfill shim weakmap es7 esnext symbol caveats prototype-methods es2019

polyfill fetch xmlhttprequest ajax tiny ponyfill unfetch

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polyfill ponyfill resize-events resize-observer

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polyfill harmony js es6 ponyfill implementation es5 symbol es es6-symbol harmony-symbol js-symbol es-symbol

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