wagtail/tsconfig.json

{
    "compilerOptions": {
        "jsx": "react",
        "lib": ["es2015", "dom"],
        "noImplicitAny": false,  // TODO: Enable once all existing code is typed
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "strictNullChecks": true,
        "esModuleInterop": true,
        "allowJs": true,
        "downlevelIteration": true
    },
    "files": [
        "client/src/index.ts",
        "client/src/custom.d.ts"
    ]
}