tsconfig.json

{
  "compilerOptions": {
    "incremental": true,
    "target": "es5",
    
    // This is for VSCode. Without this line, VSCode's Typescript server
    // includes *DOM* types in typechecks, and complains that location() is
    // window.location, when in fact it's peggy's location() function.
    "lib": ["ESNext"],

    // Create ESM modules
    "module": "NodeNext",
    // Specify multiple folders that act like `./node_modules/@types`
    "typeRoots": [
      "node_modules/@types",
      "./preprocessor",
      "./parser"
    ],

    "moduleResolution": "NodeNext",

    // Generate .d.ts files from TypeScript and JavaScript files in your project
    "declaration": true,
    // Specify an output folder for all emitted files.
    "outDir": "./dist",
    // Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */
    "esModuleInterop": true,                             
    // Ensure that casing is correct in imports
    "forceConsistentCasingInFileNames": true, 
    // Enable all strict type-checking options.
    "strict": true,
    // Skip type checking all .d.ts files
    "skipLibCheck": true
  }
}