fix(turbopack): prevent TypeScript from being bundled in standalone output #87262
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Introduce a mechanism to mark certain dev-only packages as external but not traced for standalone output. Added a JSONC file listing these packages and updated the resolve logic to respect this list, preventing unnecessary inclusion of dev dependencies in the standalone bundle.
Replaces loading server-external-untraced-packages.jsonc with dynamically reading devDependencies from package.json to determine packages that should not be traced for standalone output. Removes the now-unnecessary JSONC file and adds a utility function to extract devDependencies.
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What?
Exclude dev-only dependencies from being traced into the .next/standalone output when using Turbopack, preventing large build-time tools (e.g. TypeScript) from being bundled into the runtime artifact.
Why?
When output: "standalone" is enabled with Turbopack, devDependencies are currently traced and copied into the standalone bundle, even though they are never required at runtime.
This leads to significantly larger standalone outputs (e.g. typescript ~20 MB) and unexpected Docker image bloat.
Webpack does not exhibit this behavior, so this is a Turbopack-specific issue.
How?
Treat packages declared as devDependencies as untraced externals during standalone output generation.
Update the server resolver logic to respect this distinction while keeping existing external resolution behavior unchanged.
This ensures only runtime-required dependencies are included in .next/standalone.
Fixes and closes #86981