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Pass forked type checker Semantic errors to the output when running build --watch #13901

Usurer opened this Issue Mar 13, 2019 · 1 comment


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Usurer commented Mar 13, 2019

馃殌 Feature request

Command (mark with an x)

- [ ] new
- [x] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc


As described in #13870 semantic diagnostic errors from the forked type checker aren't passed to the final diagnostic messages and cannot be read by Webpack plugins. This happens during second and further runs of the build --watch.

Describe the solution you'd like

The straightforward solution would be to add one more option to the ng build.
But, since I don't really get why we don't collect semantic diagnostics from the forked type checker for the 2-nd and further runs, I'd say that we could just set diagMode in AngularCompilerPlugin._emit() to DiagnosticMode.All.

Describe alternatives you've considered

The working solution is to set forkTypeChecker build option to false. But my assumption is that on the big projects it means slower builds.


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Usurer commented Mar 16, 2019

Guys, could anyone give any advice regarding the way I should test this feature before making a pull request?

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