Add --build=1 param for tests

packages/tests/README.md

@@ -101,10 +101,16 @@ For this, you can use the `--bundlers=<name>,<name>` flag when running your test
 yarn test:noisy packages/tests/... --bundlers=webpack4,esbuild
 ```
 
-Builds are automatically cleaned up after a run, but if you want to keep them for debugging purpose, you can use the `--no-cleanup` flag:
+If you want to keep the built files for debugging purpose, you can use the `--cleanup=0` parameter:
 
 ```bash
-yarn test:noisy packages/tests/... --no-cleanup
+yarn test:noisy packages/tests/... --cleanup=0
+```
+
+If you want to also build the bundlers you're targeting, you can use the `--build=1` parameter:
+
+```bash
+yarn test:noisy packages/tests/... --build=1
 ```
 
 ### More complex projects

packages/tests/src/helpers/constants.ts

@@ -20,7 +20,12 @@ export const BUNDLER_VERSIONS: Record<BundlerFullName, string> = {
     webpack5: require('webpack5').version,
 };
 
-export const NO_CLEANUP = process.argv.includes('--no-cleanup');
+export const NO_CLEANUP = process.argv.includes('--cleanup=0');
 if (NO_CLEANUP) {
     console.log(bgYellow(" Won't clean up "));
 }
+
+export const NEED_BUILD = process.argv.includes('--build=1');
+if (NEED_BUILD) {
+    console.log(bgYellow(' Will also build used plugins '));
+}

packages/tests/src/helpers/runBundlers.ts

@@ -3,7 +3,7 @@
 // Copyright 2019-Present Datadog, Inc.
 
 import type { BundlerFullName, Options } from '@dd/core/types';
-import { bgYellow, green, red } from '@dd/tools/helpers';
+import { bgYellow, executeSync, green, red } from '@dd/tools/helpers';
 import type { BuildOptions } from 'esbuild';
 import { remove } from 'fs-extra';
 import path from 'path';
@@ -18,7 +18,7 @@ import {
     getWebpack4Options,
     getWebpack5Options,
 } from './configBundlers';
-import { NO_CLEANUP, PLUGIN_VERSIONS } from './constants';
+import { NEED_BUILD, NO_CLEANUP, PLUGIN_VERSIONS } from './constants';
 import { defaultDestination } from './mocks';
 import type { Bundler, BundlerRunFunction, CleanupFn } from './types';
 
@@ -270,6 +270,18 @@ export const BUNDLERS: Bundler[] = allBundlers.filter(
     (bundler) => specificBundlers.length === 0 || specificBundlers.includes(bundler.name),
 );
 
+// Build only if needed.
+if (NEED_BUILD) {
+    const bundlersToBuild = new Set(
+        BUNDLERS.map((bundler) => `@datadog/${bundler.name.replace(/\d/g, '')}-plugin`),
+    );
+
+    for (const bundler of bundlersToBuild) {
+        console.log(`Building ${green(bundler)}...`);
+        executeSync('yarn', ['workspace', bundler, 'run', 'build']);
+    }
+}
+
 export const runBundlers = async (
     pluginOverrides: Partial<Options> = {},
     bundlerOverrides: Record<string, any> = {},

packages/tools/src/helpers.ts

@@ -4,7 +4,7 @@
 
 import type { GetPlugins } from '@dd/core/types';
 import chalk from 'chalk';
-import { execFile } from 'child_process';
+import { execFile, execFileSync } from 'child_process';
 import fs from 'fs-extra';
 import path from 'path';
 import { promisify } from 'util';
@@ -26,6 +26,9 @@ const maxBuffer = 1024 * 1024;
 export const execute = (cmd: string, args: string[], cwd: string = ROOT) =>
     execFileP(cmd, args, { maxBuffer, cwd, encoding: 'utf-8' });
 
+export const executeSync = (cmd: string, args: string[], cwd: string = ROOT) =>
+    execFileSync(cmd, args, { maxBuffer, cwd, encoding: 'utf-8' });
+
 export const slugify = (string: string) => {
     return string
         .toString()