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docs: edit golden file error description (#34871) 

PR Close #34871
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Judy Bogart 2020-01-20 08:58:36 -08:00 committed by Matias Niemelä
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@ -47,10 +47,11 @@ Our peer dependencies (such as TypeScript, Zone.js, or RxJS) are not considered
<a name="golden-files"></a>
## Golden files
Angular tracks the status of the public API in *golden files*. These files are stored in [tools/public_api_guard/](../tools/public_api_guard) and are maintained with a tool called [TS API Guardian](https://www.npmjs.com/package/ts-api-guardian).
If you modify any part of a public API in one of the supported public packages, you must update the golden files that track the public API surface.
If the golden files are not updated correctly, our test suite will detect the problem and the PR will fail to pass the tests.
In such cases, a test error message will provide instructions for a command that updates the golden files.
Angular tracks the status of the public API in a *golden file*, maintained with a tool called the *public API guard*.
If you modify any part of a public API in one of the supported public packages, the PR can fail a test in CI with an error message that instructs you to accept the golden file.
The public API guard provides a Bazel target that updates the current status of a given package. If you add to or modify the public API in any way, you must use [yarn](https://yarnpkg.com/) to execute the Bazel target in your terminal shell of choice (a recent version of `bash` is recommended).
```shell
yarn bazel run //tools/public_api_guard:<modified_package>_api.accept