[npm] Check for devtools_bundle=false in npm run build -- --watch.

Bug: 411328609
Change-Id: Iac4de94fd99c447428705e0d6d3d3c2c5790919d
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6687409
Commit-Queue: Ergün Erdoğmuş <ergunsh@chromium.org>
Reviewed-by: Ergün Erdoğmuş <ergunsh@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>

Author: bmeurer

docs/get_the_code.md

@@ -46,28 +46,19 @@ it'll automatically create and initialize it.
 You can disable type checking (via TypeScript) by using the `devtools_skip_typecheck`
 argument in your GN configuration. This uses [esbuild](https://esbuild.github.io/)
 instead of `tsc` to compile the TypeScript files and generally results in much
-shorter build times. To switch the `Default` target to esbuild, use
-
-```bash
-gn gen out/Default --args="devtools_skip_typecheck=true"
-```
-
-or if you don't want to change the default target, use something like
-
-```bash
-gn gen out/fast-build --args="devtools_skip_typecheck=true"
-```
-
-and use `npm run build -- -t fast-build` to build this target.
+shorter build times.
 
 Additionally, we now bundle files together by default in all builds, which has
 a build time cost. If you want an even fast fast build, you might want to opt
-out of bundling by setting `devtools_bundle` to `false`:
+out of bundling by setting `devtools_bundle` to `false`
 
 ```bash
 gn gen out/fast-build --args="devtools_skip_typecheck=true devtools_bundle=false"
 ```
 
+and use `npm run build -- -t fast-build` to build this target (you can of course
+also just change the `Default` target to skip bundling and type checking).
+
 
 ### Rebuilding automatically
 

scripts/devtools_build.mjs

@@ -284,7 +284,7 @@ async function computeBuildTargetsForFiles(target, filenames) {
       filenames = filenames.map(filename => path.join('third_party', 'devtools-frontend', 'src', filename));
     }
     const gnArgs = await gnArgsForTarget(target);
-    if (gnArgs.get('is_debug') === 'true') {
+    if (gnArgs.get('devtools_bundle') === 'false') {
       try {
         const gnRefs = (await Promise.all(filenames.map(filename => gnRefsForTarget(target, filename)))).flat();
         if (gnRefs.length) {