feat: add JEST_MAX_WORKERS environment variable support#1
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Add support for setting maxWorkers via the JEST_MAX_WORKERS environment variable. This provides a convenient way to control worker count in CI environments without modifying configuration files or CLI arguments. Priority order: argv.maxWorkers > defaultOptions.maxWorkers > JEST_MAX_WORKERS > CPU-based defaults. The environment variable supports both numeric values and percentage-based values (e.g., "50%"), consistent with existing maxWorkers behavior.
This reverts commit c3b5db8.
…#16009) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
…updates (jestjs#16007) Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
…date (jestjs#16059) Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
…jestjs#15977) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
…oup across 1 directory (jestjs#16149) Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
* chore(runtime): avoid magical `null` value * changelog * review comments * another fix * constant * sorted * ah, not here
…er compatibility (jestjs#16167)
…plement `clearMocksOnScope` (jestjs#16169)
Co-authored-by: Tim Seckinger <github@jeys.al>
Also add specific instructions to many packages
… unnecessary checks (jestjs#15721)
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Summary
maxWorkersvia theJEST_MAX_WORKERSenvironment variable"4") and percentage-based values (e.g.,"50%")Changes
packages/jest-config/src/getMaxWorkers.ts: Added check forprocess.env.JEST_MAX_WORKERSin the resolution priority chainpackages/jest-config/src/__tests__/getMaxWorkers.test.ts: Added 5 new unit tests covering the environment variable functionality, priority order, and percentage supportdocs/Configuration.md: Updated themaxWorkersdocumentation section to explain the priority order and usage ofJEST_MAX_WORKERSPriority Order
The
maxWorkersoption is now resolved in the following order:argv.maxWorkers(CLI argument)defaultOptions.maxWorkers(configuration file)process.env.JEST_MAX_WORKERS(environment variable) ⬅️ newTest Plan
yarn build:jsgetMaxWorkers.test.tspass, including 5 new tests for the environment variable🤖 Generated with Claude Code