toolkit: expose maxWorkers option for plugin build & test tasks (#27724)

packages/grafana-toolkit/README.md

@@ -93,6 +93,7 @@ Available options:
 - `-u`, `--updateSnapshot` - Performs snapshots update.
 - `--testNamePattern=<regex>` - Runs test with names that match provided regex (https://jestjs.io/docs/en/cli#testnamepattern-regex).
 - `--testPathPattern=<regex>` - Runs test with paths that match provided regex (https://jestjs.io/docs/en/cli#testpathpattern-regex).
+- `--maxWorkers=<num>|<string>` - Limit number of Jest workers spawned (https://jestjs.io/docs/en/cli#--maxworkersnumstring)
 
 ### Build your plugin
 

packages/grafana-toolkit/src/cli/index.ts

@@ -138,10 +138,11 @@ export const run = (includeInternalScripts = false) => {
 
   program
     .command('plugin:build')
+    .option('--maxJestWorkers <num>|<string>', 'Limit number of Jest workers spawned')
     .description('Prepares plugin dist package')
     .option('--coverage', 'Run code coverage', false)
     .action(async cmd => {
-      await execTask(pluginBuildTask)({ coverage: cmd.coverage, silent: true });
+      await execTask(pluginBuildTask)({ coverage: cmd.coverage, silent: true, maxJestWorkers: cmd.maxJestWorkers });
     });
 
   program
@@ -164,6 +165,7 @@ export const run = (includeInternalScripts = false) => {
     .option('--watch', 'Run tests in interactive watch mode')
     .option('--testPathPattern <regex>', 'Run only tests with a path that matches the regex')
     .option('--testNamePattern <regex>', 'Run only tests with a name that matches the regex')
+    .option('--maxWorkers <num>|<string>', 'Limit number of workers spawned')
     .description('Executes plugin tests')
     .action(async cmd => {
       await execTask(pluginTestTask)({
@@ -172,6 +174,7 @@ export const run = (includeInternalScripts = false) => {
         watch: !!cmd.watch,
         testPathPattern: cmd.testPathPattern,
         testNamePattern: cmd.testNamePattern,
+        maxWorkers: cmd.maxWorkers,
         silent: true,
       });
     });
@@ -179,10 +182,12 @@ export const run = (includeInternalScripts = false) => {
   program
     .command('plugin:ci-build')
     .option('--finish', 'move all results to the jobs folder', false)
+    .option('--maxJestWorkers <num>|<string>', 'Limit number of Jest workers spawned')
     .description('Build the plugin, leaving results in /dist and /coverage')
     .action(async cmd => {
       await execTask(ciBuildPluginTask)({
         finish: cmd.finish,
+        maxJestWorkers: cmd.maxJestWorkers,
       });
     });
 

packages/grafana-toolkit/src/cli/tasks/plugin.build.ts

@@ -16,6 +16,7 @@ const rimraf = promisify(rimrafCallback);
 
 interface PluginBuildOptions {
   coverage: boolean;
+  maxJestWorkers?: string;
 }
 
 interface Fixable {
@@ -111,10 +112,10 @@ export const lintPlugin = ({ fix }: Fixable = {}) =>
     }
   });
 
-export const pluginBuildRunner: TaskRunner<PluginBuildOptions> = async ({ coverage }) => {
+export const pluginBuildRunner: TaskRunner<PluginBuildOptions> = async ({ coverage, maxJestWorkers }) => {
   await prepare();
   await lintPlugin({ fix: false });
-  await testPlugin({ updateSnapshot: false, coverage, watch: false });
+  await testPlugin({ updateSnapshot: false, coverage, maxWorkers: maxJestWorkers, watch: false });
   await bundlePlugin({ watch: false, production: true });
 };
 

packages/grafana-toolkit/src/cli/tasks/plugin.ci.ts

@@ -27,6 +27,7 @@ export interface PluginCIOptions {
   finish?: boolean;
   upload?: boolean;
   signingAdmin?: boolean;
+  maxJestWorkers?: string;
 }
 
 /**
@@ -40,7 +41,7 @@ export interface PluginCIOptions {
  *  Anything that should be put into the final zip file should be put in:
  *   ~/ci/jobs/build_xxx/dist
  */
-const buildPluginRunner: TaskRunner<PluginCIOptions> = async ({ finish }) => {
+const buildPluginRunner: TaskRunner<PluginCIOptions> = async ({ finish, maxJestWorkers }) => {
   const start = Date.now();
 
   if (finish) {
@@ -58,7 +59,7 @@ const buildPluginRunner: TaskRunner<PluginCIOptions> = async ({ finish }) => {
     writeJobStats(start, workDir);
   } else {
     // Do regular build process with coverage
-    await pluginBuildRunner({ coverage: true });
+    await pluginBuildRunner({ coverage: true, maxJestWorkers });
   }
 };
 

packages/grafana-toolkit/src/cli/tasks/plugin/tests.ts

@@ -8,9 +8,17 @@ export interface PluginTestOptions {
   watch: boolean;
   testPathPattern?: string;
   testNamePattern?: string;
+  maxWorkers?: string;
 }
 
-export const testPlugin = ({ updateSnapshot, coverage, watch, testPathPattern, testNamePattern }: PluginTestOptions) =>
+export const testPlugin = ({
+  updateSnapshot,
+  coverage,
+  watch,
+  testPathPattern,
+  testNamePattern,
+  maxWorkers,
+}: PluginTestOptions) =>
   useSpinner('Running tests', async () => {
     const testConfig = loadJestPluginConfig();
 
@@ -22,6 +30,7 @@ export const testPlugin = ({ updateSnapshot, coverage, watch, testPathPattern, t
       testPathPattern: testPathPattern ? [testPathPattern] : [],
       testNamePattern: testNamePattern ? [testNamePattern] : [],
       passWithNoTests: true,
+      maxWorkers,
     };
 
     // @ts-ignore

scripts/webpack/webpack.dev.js

@@ -87,21 +87,21 @@ module.exports = (env = {}) =>
       env.noTsCheck
         ? new webpack.DefinePlugin({}) // bogus plugin to satisfy webpack API
         : new ForkTsCheckerWebpackPlugin({
-          eslint: {
-            enabled: true,
-            files: ['public/app/**/*.{ts,tsx}', 'packages/*/src/**/*.{ts,tsx}'],
-            options: {
-              cache: true,
+            eslint: {
+              enabled: true,
+              files: ['public/app/**/*.{ts,tsx}', 'packages/*/src/**/*.{ts,tsx}'],
+              options: {
+                cache: true,
+              },
             },
-          },
-          typescript: {
-            mode: 'write-references',
-            diagnosticOptions: {
-              semantic: true,
-              syntactic: true,
+            typescript: {
+              mode: 'write-references',
+              diagnosticOptions: {
+                semantic: true,
+                syntactic: true,
+              },
             },
-          },
-        }),
+          }),
       new MiniCssExtractPlugin({
         filename: 'grafana.[name].[hash].css',
       }),