The best replacement for es6 is es5.

The best alternatives to es6 are rated as following:
★★★★★  es5
★★★★  typescript
★★★★  es7
★★★★  coffeescript
★★★  mp6
★★  korg m50
★  fantom x6
★  xs6
★  mo6
  roland fantom x6

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Google Trends

Scale is based on the average worldwide traffic of es6 in all years. Click on graph for more.
es6
es5
typescript