tsconfig.json

{
    "compilerOptions": {
        /* Basic Options */
        "target": "ES2020",
        // "module": "commonjs",
        "module": "ES2020",
        "lib": ["ES2020"],
        "allowJs": false,
        "declaration": true,
        "sourceMap": true,
        "outDir": "./build",
        "stripInternal": true,

        /* Strict Type-Checking Options */
        "strict": true /* Enable all strict type-checking options. */,
        "strictNullChecks": true,              /* Enable strict null checks. */
        "strictFunctionTypes": true,           /* Enable strict checking of function types. */
        "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
        "noImplicitAny": true /* Raise error on expressions and declarations with an implied 'any' type. */,
        "noImplicitThis": true /* Raise error on 'this' expressions with an implied 'any' type. */,
        "alwaysStrict": true /* Parse in strict mode and emit "use strict" for each source file. */,

        /* Additional Checks */
        "forceConsistentCasingInFileNames": true,
        "noUnusedLocals": false /* Report errors on unused locals. */,
        "noUnusedParameters": false /* Report errors on unused parameters. */,
        "noImplicitReturns": true /* Report error when not all code paths in function return a value. */,
        "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */,

        /* Module Resolution Options */
        "moduleResolution": "node" /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */,
        // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
        // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
        "rootDir": "./src" /* List of root folders whose combined content represents the structure of the project at runtime. */,
        "typeRoots": [
            /* List of folders to include type definitions from. */
            "./node_modules/@types",
            "./@types"
        ],
        "resolveJsonModule": true,
        // "typeRoots": [],                       /* List of folders to include type definitions from. */
        // "types": [],                           /* Type declaration files to be included in compilation. */
        // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
        "esModuleInterop": true, /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
        // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */

        /* Source Map Options */
        // "sourceRoot": "./",                    /* Specify the location where debugger should locate TypeScript files instead of source locations. */
        // "mapRoot": "./",                       /* Specify the location where debugger should locate map files instead of generated locations. */
        // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
        // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */

        /* Experimental Options */
        "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
        "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
    },
    "include": ["./src/**/*"],
    "compileOnSave": true
}