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Cache node_modules on Azure Pipelines #19437

merged 3 commits into from Jun 4, 2019


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commented Jun 3, 2019

Refs: #19366

This pull request's aim is to speed up our CI build times by taking advantage of on this repository.

Caches are looked up by a key based on the contents of all package-lock.json files in the repository. When (at least) one of them changes, the cache won't be used and dependencies will be re-bootstrapped from scratch. We could probably find ways of starting with a base set of dependencies (e.g., the ones found on master) and only perform a partial bootstrap, but @rafeca pointed out that this could lead to some non-determinism in the package installed by npm. Maybe this is one argument in favor of switching to yarn at some point.

For now, this pull request picks the low-hanging fruit of skipping script/bootstrap entirely if the lockfile perfectly matches the set of dependencies that we have in the cache. When that happens, it saves ~8-9 minutes of build time.

Next Steps

In the future, we may want to investigate a couple of different options:

@as-cii as-cii force-pushed the as/ci-caching branch 3 times, most recently from 775f07e to 0baaa4f Jun 3, 2019

Cache node_modules on Azure Pipelines based on package-lock.json
Co-Authored-By: Nathan Sobo <>
Co-Authored-By: Rafael Oleza <>

@as-cii as-cii force-pushed the as/ci-caching branch from a3d4810 to 3be4889 Jun 4, 2019

@as-cii as-cii marked this pull request as ready for review Jun 4, 2019

@as-cii as-cii requested review from rafeca and nathansobo Jun 4, 2019


rafeca approved these changes Jun 4, 2019

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@as-cii as-cii merged commit a21a2e3 into master Jun 4, 2019

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@as-cii as-cii deleted the as/ci-caching branch Jun 4, 2019

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