build: update build target from ES5 to ES6

[pionxzh]

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[rtritto]

@pionxzh next step is to use ESNext?

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (v3.x@e57d620). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             v3.x     #317   +/-   ##
=======================================
  Coverage        ?   88.48%           
=======================================
  Files           ?       25           
  Lines           ?     2345           
  Branches        ?      414           
=======================================
  Hits            ?     2075           
  Misses          ?      269           
  Partials        ?        1           

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[pionxzh]

@rtritto wait, what's your definition of ESNext? This is V3 branch. I want to drop the support for IE, so I update the target to ES6.

[rtritto]

The special ESNext value refers to the highest version your version of TypeScript supports. This setting should be used with caution, since it doesn’t mean the same thing between different TypeScript versions and can make upgrades less predictable.

Source: https://www.typescriptlang.org/tsconfig#target

[pionxzh]

I think ESNext is risky...
I just checked, as the fact that we are using MUI, we should be able to directly follow their browserslistrc range?

[pionxzh]

Nice. 80 KB -> 63 KB 😄