tsconfig.json

{
  "compilerOptions": {
    "rootDir": ".",
    "outDir": "build",

    "incremental": true,
    "tsBuildInfoFile": "./build/ts-cache.tsbuildinfo",

    "lib": ["es2020", "dom", "dom.iterable", "scripthost"],
    // Do not include all the type definitions in `node_modules/@types`,
    // which include NodeJS definitions that are not applicable to a web app
    // but only those type definitions that are required
    "types": ["@types/codemirror"],

    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,

    "target": "es2019",
    "module": "esnext",
    "esModuleInterop": true,
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "allowUmdGlobalAccess": true, // for CodeMirror

    "strictNullChecks": false,
    "noImplicitAny": false,
    "noLib": false,

    // We'll strip the comments with rollup.
    // Need them for the declaration files
    "removeComments": false,
    "sourceMap": true
  },
  "exclude": ["coverage", "node_modules", "**/*.spec.ts"]
}