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With this change we emit the compilation result when the compilation is closed, when the compilation is not in watch mode.

This is needed so that when persistent caching is enabled and architect promise API is used (.result) instead of .output we wait for the cache to be written prior to terminating the process/resolving the result promise.

The result API currently, takes the first emit

get result() {
return output.pipe(first()).toPromise();
},

Closes #21419

With this change we emit the compilation result when the compilation is closed, when the compilation is not in watch mode.

This is needed so that when persistent caching is enabled and architect promise API is used (`.result`) instead of `.output` we wait for the cache to be written prior to terminating the process/resolving the result promise.

The `result` API currently, takes the first emit https://github.com/angular/angular-cli/blob/4f9df9f4a4da81c9ecd8733204226c030f8f7d56/packages/angular_devkit/architect/src/schedule-by-name.ts#L118-L120

Closes #21419
@alan-agius4 alan-agius4 added the target: patch This PR is targeted for the next patch release label Jul 27, 2021
@alan-agius4 alan-agius4 requested a review from clydin July 27, 2021 14:02
@google-cla google-cla bot added the cla: yes label Jul 27, 2021
@alan-agius4 alan-agius4 added the action: merge The PR is ready for merge by the caretaker label Jul 27, 2021
@clydin clydin merged commit 6153530 into angular:master Jul 27, 2021
@alan-agius4 alan-agius4 deleted the build-webpack branch July 27, 2021 16:19
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action: merge The PR is ready for merge by the caretaker target: patch This PR is targeted for the next patch release

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Can't make NG_PERSISTENT_BUILD_CACHE work

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