tsconfig.json

{
  "compilerOptions": {
    "declaration": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "module": "commonjs",
    "moduleResolution": "node",
    "noEmitOnError": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": true,
    "noImplicitThis": true,
    "noUnusedParameters": false,
    // The linter is used for these.
    "noUnusedLocals": false,
    // The linter is used for these.
    "skipDefaultLibCheck": true,
    "skipLibCheck": true,
    "inlineSourceMap": true,
    "sourceRoot": ".",
    // Inline sources are necessary for our tests to show the proper sources, since we are using
    // Istanbul (not Constantinople) as well, and applying both source maps to get the original
    // source in devtools.
    "inlineSources": true,
    "strictNullChecks": true,
    "resolveJsonModule": true,
    "composite": true,
    "target": "es2020",
    "lib": ["es2020", "dom"]
  }
}