sp-dev-fx-webparts/samples/react-script-editor/tsconfig.json

{
    "compilerOptions": {
        "target": "es5",
        "forceConsistentCasingInFileNames": true,
        "module": "esnext",
        "jsx": "react",
        "declaration": true,
        "sourceMap": true,
        "experimentalDecorators": true,
        "skipLibCheck": true,
        "moduleResolution": "node",
        "typeRoots": [
            "./node_modules/@types",
            "./node_modules/@microsoft"
        ],
        "types": [
            "es6-promise",
            "webpack-env"
        ],
        "lib": [
            "es5",
            "dom",
            "es2015.collection"
        ]
    }
}