vscode-extension-samples/codelens-sample/tsconfig.json

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "es2019",
		"lib": ["ES2019"],
        "outDir": "out",
        "sourceMap": true,
        "rootDir": "src",
        /* Strict Type-Checking Option */
        "strict": true,   /* enable all strict type-checking options */
        /* Additional Checks */
        "noUnusedLocals": true /* Report errors on unused locals. */
    },
    "exclude": [
        "node_modules"
    ]
}