tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    // TypeScript 7 enables strict by default; the assets adopt types
    // incrementally, so keep the looser checks for now.
    "strict": false,
    // Each file opts in with a `// @ts-check` comment.
    "checkJs": false,
    // Modules make unused imports easy to leave behind, and they cost a
    // request each. Unused *parameters* are left alone: the code has plenty of
    // deliberately-ignored handler arguments.
    "noUnusedLocals": true,
    // Modules are strict mode, so `this` is undefined in a plain function
    // rather than the global object the concatenated bundle gave it.
    "noImplicitThis": true,
    "noEmit": true,
    "target": "ES2022",
    "module": "preserve",
    "moduleResolution": "bundler",
    "lib": ["ES2022", "DOM", "DOM.Iterable"]
  },
  "include": ["assets/javascripts/**/*.js", "assets/javascripts/**/*.d.ts"],
  "exclude": ["assets/javascripts/vendor"]
}