tsconfig.json

{
    "compilerOptions": {
        "target": "es2015",
        "module": "commonJS" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
        "strict": true /* Enable all strict type-checking options. */,
        "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. */,

        "rootDir": "src",
        "outDir": "dist",
        "declaration": true,
        "sourceMap": true,
        "newLine": "LF",
        "stripInternal": true,

        /* Additional Checks */
        "noUnusedLocals": true /* Report errors on unused locals. */,
        "noUnusedParameters": true /* 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. */,
        "noUncheckedIndexedAccess": true /* Include 'undefined' in index signature results */,
        //"noPropertyAccessFromIndexSignature": true,  /* Require undeclared properties from index signatures to use element accesses. */

        "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
        "skipLibCheck": true /* Skip type checking of declaration files. */,
        "forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */
    },
    "exclude": ["simple-test.ts", "dist"],
}