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Support ESM #710

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ahnpnl opened this issue Jan 6, 2021 · 1 comment
Closed

Support ESM #710

ahnpnl opened this issue Jan 6, 2021 · 1 comment
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ES Modules 🚀 Feature Request new suggested feature

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@ahnpnl
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ahnpnl commented Jan 6, 2021 •
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🚀 Feature Proposal

Support compilation to ESM for both isolatedModules: false and isolatedModules: true. Potential work:

  • Adjust inline-files and strip-styles transformers to transform to ESM compatible codes, like the way replace-resources does. This is important for isolatedModules: true because it doesn't use TypeScript Program therefore it can't reuse inline-resources transformer.
  • Adjust isolatedModules: false compilation path to accept module ESM values, including ES2015/ES2020 and ESNext for compiler options. Currently isolatedModules: true already did it.
  • Investigate to see if replace-resources can be used for isolatedModules: true.

Motivation

Allow users to switch to ESM when they want.

Example

Test and check whether ESM output is produced
@ahnpnl ahnpnl added the 🚀 Feature Request new suggested feature label Jan 6, 2021
@ahnpnl ahnpnl pinned this issue Jan 6, 2021
@ahnpnl ahnpnl mentioned this issue Jan 7, 2021
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ahnpnl added a commit that referenced this issue Jan 7, 2021
@ahnpnl
feat(compiler): use replace-resources for isolatedModules: true (#…
76c25d2 
…717)

Copy source code of TypeScript `transpileModule` so that we can get `Program` which is created in that function which then allows us to use `replace-resources` transformer from Angular.

This also provides fully compatibility to ESM for `isolatedModules: true`, related to #710 

BREAKING CHANGE
- `inline-files` and `strip-styles` are removed from `jest-preset-angular` and now `jest-preset-angular` always uses Angular `replace-resources` instead for both `isolatedModules: false` and `isolatedModules: true`.
- The transformers in your jest config
```
'jest-preset-angular/build/InlineFilesTransformer'
'jest-preset-angular/build/StripStylesTransformer'
```
or
```
'jest-preset-angular/build/transformers/inline-files'
'jest-preset-angular/build/transformers/strip-styles'
```
must be removed
This was referenced Jan 8, 2021
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ahnpnl added a commit that referenced this issue Jan 11, 2021
@ahnpnl
feat(presets): add ESM preset (#723)
b0073b0 
Related to #710
@ahnpnl
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ahnpnl commented Jan 11, 2021

Close via #717 #721 #723

@ahnpnl ahnpnl closed this as completed Jan 11, 2021
@ahnpnl ahnpnl unpinned this issue May 27, 2021
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