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Support iOS 9

I’m getting this error on Safari iOS version 9.3.5:

SyntaxError: Unexpected keyword ‘const’. Const declarations are not supported in strict mode.

Is possible to support this version whitout make many changes?

I try this:

  "browserslist": [
    "last 6 versions",
    "android 4",
    "opera 12"
  ],

Without success.