terser

JavaScript parser, mangler/compressor and beautifier toolkit for ES6+
v5.43.1 URL: https://unpkg.com/terser@5.43.1/dist/bundle.min.js
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uglifyterseruglify-esuglify-jsminifyminifierjavascriptecmascriptes5es6es7es8es2015es2016es2017asyncawait

has-symbol-support-x

Tests if ES6 Symbol is supported.
v2.1.2 URL: https://unpkg.com/has-symbol-support-x@2.1.2/dist/has-symbol-support-x.js
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ES6hasSymbolSupportmodulejavascriptnodejsbrowser

has-to-string-tag-x

Tests if ES6 @@toStringTag is supported.
v2.1.2 URL: https://unpkg.com/has-to-string-tag-x@2.1.2/dist/has-to-string-tag-x.js
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ES6hasToStringTagmodulejavascriptnodejsbrowser

regexpu-core

regexpu’s core functionality (i.e. `rewritePattern(pattern, flag)`), capable of translating ES6 Unicode regular expressions to ES5.
v6.2.0 URL: https://unpkg.com/regexpu-core@6.2.0/rewrite-pattern.js
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codegendesugaringecmascriptes5es6harmonyjavascriptrefactoringregexregexpregular expressionsrewritingsyntaxtransformationtranspiletranspilerunicode

traceur

ES6 to ES5 compiler
v0.0.111 URL: https://unpkg.com/traceur@0.0.111/src/node/api.js
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javascriptecmascriptlanguagees5es6ES.nextharmonycompilertranspiler