Files
peter 3fe0897fd3 build(frontend): enable the zero-fallout compiler flags (S3a)
Three strictness flags that the codebase already satisfies (0 errors each):
- noFallthroughCasesInSwitch on src + e2e — a missing `break` is now a type error.
- noUnusedLocals + noUnusedParameters on the e2e project, so it matches src and node
  and dead spec scaffolding can't accumulate (it was the one project without them).
- allowJs + checkJs on the node project, pulling tailwind.config.js and
  postcss.config.js under the type checker (the last hole in C-4.5) — a real type
  error in either is now caught (verified: `content: 123` fails; Config stays
  permissive on plugin keys by design).

noUncheckedIndexedAccess is NOT here — it has 98 call-site fixes and lands as its own
reviewable sub-sprint (S3b).
2026-07-21 03:47:55 +02:00

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{
// The build-tool configs run in Node, not the browser: they need node types and must NOT be
// checked against the app's DOM lib. Split out because tsconfig.json's `include` is ["src"],
// so until now nothing type-checked these files at all (R2 / C-4.5). `npm run typecheck`
// runs this project alongside src and e2e.
"compilerOptions": {
// composite: required to be the target of tsconfig.json's `references` (which is what makes
// editors check these files under THIS config instead of an inferred one). A composite project
// may not disable emit (TS6310), so it emits declarations only, into node_modules — nothing
// lands in the repo and nothing reaches the bundle. Hence `tsc -p` without --noEmit below.
"composite": true,
"declaration": true,
"emitDeclarationOnly": true,
"outDir": "./node_modules/.tmp/tsconfig-node",
"tsBuildInfoFile": "./node_modules/.tmp/tsconfig-node/.tsbuildinfo",
"target": "ES2022",
"module": "ESNext",
"moduleResolution": "bundler",
"lib": ["ES2022"],
"types": ["node"],
"strict": true,
"skipLibCheck": true,
"noUnusedLocals": true,
"noUnusedParameters": true,
"noFallthroughCasesInSwitch": true,
"resolveJsonModule": true,
// The build-tool configs include two hand-written .js files (tailwind/postcss). checkJs runs
// the type checker over them via their `@type` JSDoc, so a bad tailwind/postcss option is
// caught by the gate instead of silently mis-building CSS. Was the last hole in C-4.5.
"allowJs": true,
"checkJs": true
},
"include": ["vite.config.ts", "vitest.config.ts", "tailwind.config.js", "postcss.config.js"]
}