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As of TypeScript 3.9, the tsc emit is not compatible with Closure Compiler due to https://github.com/microsoft/TypeScript/pull/32011. There is some hope that this will be fixed by a solution like the one proposed in https://github.com/microsoft/TypeScript/issues/38374 but currently it's unclear if / when that will happen. Since the Closure support has been somewhat already broken, and the tsickle pass has been a source of headaches for some time for Angular packages, we are removing it for now while we rethink our strategy to make Angular Closure compatible outside of Google. This change has no effect on our Closure compatibility within Google which work well because all the code is compiled from sources and passed through tsickle. This change only disables the tsickle pass but doesn't remove it. A follow up PR should either remove all the traces of tscikle or re-enable the fixed version. BREAKING CHANGE: Angular npm packages no longer contain jsdoc comments to support Closure Compiler's advanced optimizations The support for Closure compiler in Angular packages has been experimental and broken for quite some time. As of TS3.9 Closure is unusable with the JavaScript emit. Please follow https://github.com/microsoft/TypeScript/issues/38374 for more information and updates. If you used Closure compiler with Angular in the past, you will likely be better off consuming Angular packages built from sources directly rather than consuming the version we publish on npm which is primarily optimized for Webpack/Rollup + Terser build pipeline. As a temporary workaround you might consider using your current build pipeline with Closure flag `--compilation_level=SIMPLE`. This flag will ensure that your build pipeline produces buildable and runnable artifacts, at the cost of increased payload size due to advanced optimizations being disabled. If you were affected by this change, please help us understand your needs by leaving a comment on https://github.com/angular/angular/issues/37234. PR Close #37221 |
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