tsconfig.json

{
    "compilerOptions": {
        "experimentalDecorators": true,
        "module": "commonjs",
        "target": "es2020",
        "outDir": "out",
        "lib": [
            "ES2020",
            "es2020.string"
        ],
        "sourceMap": true,
        "rootDir": "src",
        "declaration": true,
        "declarationDir": "./types",
        "strict": true, /* enable all strict type-checking options */
        "resolveJsonModule": true,
        "esModuleInterop": true,
	    "allowSyntheticDefaultImports" : true,
        "noUnusedLocals": true,
        "pretty": true,
        "strictNullChecks": true,
        "strictFunctionTypes": true,
        "noFallthroughCasesInSwitch": true,
        "alwaysStrict": true,
        "noImplicitReturns": true,
        /* "exactOptionalPropertyTypes": true, */
        "noImplicitThis": true,
        "skipLibCheck":true
    },
    "exclude": [
        "out",
        "types",
        "node_modules",
        ".vscode-test",
        ".vscode-test-web"
    ]
}