chore: configurable parallelism of jest and build:multi

docs/guides/development.md

@@ -134,3 +134,11 @@ This can be done by setting the environment variable `NODE_OPTIONS=--max_old_spa
 [Debug Angular apps in production without revealing source maps](https://medium.com/angular-in-depth/debug-angular-apps-in-production-without-revealing-source-maps-ab4a235edd85)
 
 - If you also generate the source maps for production builds, you can load them in the browser development tools and use them for debugging production setups.
+
+## Parallelism
+
+The parallelism of `npm run test` and `npm run build:multi` can be customized with environment variables.
+
+The environment variable `JEST_MAX_WORKERS` is deferred to [`maxWorkers`](https://jestjs.io/docs/configuration#maxworkers-number--string) of `jest`.
+
+The environment variable `PWA_BUILD_MAX_WORKERS` is deferred to [`--max-parallel`](https://github.com/mysticatea/npm-run-all/blob/master/docs/npm-run-all.md#npm-run-all-command) of `npm-run-all`.

jest.config.js

@@ -8,7 +8,7 @@ module.exports = {
   },
   preset: 'jest-preset-angular',
   testRunner: 'jest-jasmine2',
-  maxWorkers: '75%', // keep some cpu for moving the mouse
+  maxWorkers: process.env.JEST_MAX_WORKERS || '75%', // keep some cpu for moving the mouse
   roots: ['src', 'projects'],
   setupFilesAfterEnv: ['<rootDir>/src/setupJest.ts'],
   transformIgnorePatterns: [`node_modules/(?!${esModules.join('|')})`],

scripts/build-multi-pwa.js

@@ -25,7 +25,7 @@ if (processArgs.includes('server') || !processArgs.includes('client'))
     )
   );
 
-const cores = Math.round(require('os').cpus().length / 3) || 1;
+const cores = +process.env.PWA_BUILD_MAX_WORKERS || Math.round(require('os').cpus().length / 3) || 1;
 const parallel = cores === 1 ? [] : ['--max-parallel', cores, '--parallel'];
 if (parallel) {
   console.log(`Using ${cores} cores for multi compile.`);