Fix development build scripts (#14594)

#14583 broke the development build scripts (e.g. `yarn start`) by adding a positional argument to a package script (`build:dev`) that is used and passed positional arguments in the build script itself. This PR removes the positional argument from the `build:dev` script and `yarn start` now works again. In addition, the `--apply-lavamoat` flag is properly forwarded to child processes, which was not the case in the original implementation.

To test, `yarn start` should work and LavaMoat should _not_ be applied, in distinction to `yarn build:dev dev --apply-lavamoat=true`. Whether LavaMoat is applied can be determined by checking whether `Object.isFrozen(Object.prototype)` is `true` (with LavaMoat) or `false` (without LavaMoat).

development/build/scripts.js

@@ -285,6 +285,7 @@ function createScriptTasks({
       installSentrySubtask,
     ].map((subtask) =>
       runInChildProcess(subtask, {
+        applyLavaMoat,
         buildType,
         isLavaMoat,
         policyOnly,

development/build/task.js

@@ -50,7 +50,7 @@ function createTask(taskName, taskFn) {
 
 function runInChildProcess(
   task,
-  { buildType, isLavaMoat, policyOnly, shouldLintFenceFiles },
+  { applyLavaMoat, buildType, isLavaMoat, policyOnly, shouldLintFenceFiles },
 ) {
   const taskName = typeof task === 'string' ? task : task.taskName;
   if (!taskName) {
@@ -60,44 +60,23 @@ function runInChildProcess(
   }
 
   return instrumentForTaskStats(taskName, async () => {
-    let childProcess;
+    const childProcess = spawn(
-    // Use the same build type for subprocesses, and only run them in LavaMoat
+      'yarn',
-    // if the parent process also ran in LavaMoat.
+      [
-    if (isLavaMoat) {
+        // Use the same build type for subprocesses, and only run them in
-      childProcess = spawn(
+        // LavaMoat if the parent process also ran in LavaMoat.
-        'yarn',
+        isLavaMoat ? 'build' : 'build:dev',
-        [
+        taskName,
-          'build',
+        `--apply-lavamoat=${applyLavaMoat ? 'true' : 'false'}`,
-          taskName,
+        `--build-type=${buildType}`,
-          '--build-type',
+        `--lint-fence-files=${shouldLintFenceFiles ? 'true' : 'false'}`,
-          buildType,
+        `--policyOnly=${policyOnly ? 'true' : 'false'}`,
-          '--lint-fence-files',
+        '--skip-stats=true',
-          shouldLintFenceFiles,
+      ],
-          '--skip-stats',
+      {
-          ...(policyOnly ? ['--policy-only'] : []),
+        env: process.env,
-        ],
+      },
-        {
+    );
-          env: process.env,
-        },
-      );
-    } else {
-      childProcess = spawn(
-        'yarn',
-        [
-          'build:dev',
-          taskName,
-          '--build-type',
-          buildType,
-          '--lint-fence-files',
-          shouldLintFenceFiles,
-          '--skip-stats',
-          ...(policyOnly ? ['--policy-only'] : []),
-        ],
-        {
-          env: process.env,
-        },
-      );
-    }
 
     // forward logs to main process
     // skip the first stdout event (announcing the process command)

package.json

@@ -9,11 +9,11 @@
   "scripts": {
     "setup": "yarn install && yarn setup:postinstall",
     "setup:postinstall": "yarn patch-package && yarn allow-scripts",
-    "start": "yarn build:dev --apply-lavamoat=false",
+    "start": "yarn build:dev dev --apply-lavamoat=false",
-    "start:lavamoat": "yarn build:dev --apply-lavamoat=true",
+    "start:lavamoat": "yarn build:dev dev --apply-lavamoat=true",
     "dist": "yarn build prod",
     "build": "yarn lavamoat:build",
-    "build:dev": "node development/build/index.js dev",
+    "build:dev": "node development/build/index.js",
     "start:test": "SEGMENT_HOST='https://api.segment.io' SEGMENT_WRITE_KEY='FAKE' yarn build testDev",
     "benchmark:chrome": "SELENIUM_BROWSER=chrome node test/e2e/benchmark.js",
     "benchmark:firefox": "SELENIUM_BROWSER=firefox node test/e2e/benchmark.js",