tsconfig.json

{
  // This tsconfig file contains the shared config for the build (tsconfig.build.json) and type checking (tsconfig.json) config.
  "compilerOptions": {
    // Type checking
    "strict": true,
    "useDefineForClassFields": true, // Not enabled by default in `strict` mode unless we bump `target` to ES2022.
    "noFallthroughCasesInSwitch": true, // Not enabled by default in `strict` mode.
    "noImplicitReturns": true, // Not enabled by default in `strict` mode.
    "useUnknownInCatchVariables": true, // TODO: This would normally be enabled in `strict` mode but would require some adjustments to the codebase.
    "noImplicitOverride": true, // Not enabled by default in `strict` mode.
    "noUnusedLocals": true, // Not enabled by default in `strict` mode.
    "noUnusedParameters": true, // Not enabled by default in `strict` mode.
    "exactOptionalPropertyTypes": true,
    "noUncheckedIndexedAccess": true,
    // JavaScript support
    "allowJs": false,
    "checkJs": false,
    // Interop constraints
    "esModuleInterop": false,
    "allowSyntheticDefaultImports": false,
    "forceConsistentCasingInFileNames": true,
    "verbatimModuleSyntax": true,
    "importHelpers": true, // This is only used for build validation. Since we do not have `tslib` installed, this will fail if we accidentally make use of anything that'd require injection of helpers.
    "resolveJsonModule": true,
    // Language and environment
    "moduleResolution": "NodeNext",
    "module": "NodeNext",
    "target": "ES2021", // Setting this to `ES2021` enables native support for `Node v16+`: https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping.
    "lib": ["ES2022"],
    // Skip type checking for node modules
    "skipLibCheck": true
  }
}