Fix esm plugin typings and add test.

[mshima]

Generated esm plugins are generated like plugin/duration/index.js, but import still points to import dayjs from '../index', but it should be import dayjs from '../../index'.

• Fix imports.
• Add tests.
• Update babel to release.

[codecov[bot]]

Codecov Report

Merging #1544 (05e1da4) into dev (c5688f3) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##               dev     #1544   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          176       177    +1     
  Lines         1980      1986    +6     
  Branches       502       503    +1     
=========================================
+ Hits          1980      1986    +6     

Impacted Files	Coverage Δ
src/locale/sv-fi.js	100.00% <0.00%> (ø)

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[iamkun]

e.g. in file esm/locale/af.js,import dayjs from '../index' means to import root/esm/index.js, should correct don't we?

[mshima]

e.g. in file esm/locale/af.js,import dayjs from '../index' means to import root/esm/index.js, should correct don't we?

Yes, it’s just changing plugin directories. I think locales folder should be ok.

[iamkun]

e.g. in file esm/locale/af.js,import dayjs from '../index' means to import root/esm/index.js, should correct don't we?

Yes, it’s just changing plugin directories. I think locales folder should be ok.

seems we don't have to change the path here?

[mshima]

seems we don't have to change the path here?

Locale is ok, plug-ins generates a folder due to typings.

[iamkun]

seems we don't have to change the path here?

Locale is ok, plug-ins generates a folder due to typings.

Can you please detail it? Seems there's no plugin has the import statement import ../index.js

[mshima]

Honestly I don’t know why Babel adds it. Look at esm/plugins/*/index.js.

Probably due to typings. https://github.com/iamkun/dayjs/blob/8e32164855cff724642e24c37a631eb4c4d760c8/types/plugin/duration.d.ts#L2 Changing that to dayjs may fix the problem too I will test.

[mshima]

The error is just with duration plugin. Do you want me to drop the tests?