tsconfig.json

{
    "compilerOptions": {
        "baseUrl": ".",
        "paths": {
            "*": ["static/js/types/*"],
        },
        "types": [],

        /* Typescript 3.4 added the --incremental flag but its API is not
         * currently public so ts-loader cannot use it yet.
         * Tracking issue: https://github.com/microsoft/TypeScript/issues/29978
         */
        // "incremental": true,

        /* Basic options */
        "noEmit": true,
        "target": "ES2019",
        "module": "ES6",
        "esModuleInterop": true,
        "moduleResolution": "node",
        "resolveJsonModule": true,
        "sourceMap": true,

        /* Strict type-checking */
        "strict": true,
        "forceConsistentCasingInFileNames": true,
        "isolatedModules": true,

        /* Additional checks */
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "noImplicitReturns": true,
        "noFallthroughCasesInSwitch": true,
    },
    "exclude": [
        /* Type stubs are not part of the top-level project. */
        "static/js/types",

        /* Skip walking large generated directories. */
        "docs/_build",
        "static/webpack-bundles",
        "var",
        "zulip-py3-venv",

        /* Even though allowJs defaults to false, typescript-eslint forces it to true. */
        "**/*.js",
    ],
}