zulip/tsconfig.json

{
    "compilerOptions": {
        /* Type Checking */
        "exactOptionalPropertyTypes": true,
        "noFallthroughCasesInSwitch": true,
        "noImplicitOverride": true,
        "noImplicitReturns": true,
        "noUncheckedIndexedAccess": true,
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "strict": true,

        /* Modules */
        "allowImportingTsExtensions": true,
        "module": "preserve",
        "moduleResolution": "bundler",
        "paths": {
            "*": ["./web/src/types/*"],
        },
        "resolveJsonModule": true,
        "types": ["@types/jquery.validation"],

        /* Emit */
        "noEmit": true,

        /* Interop Constraints */
        "esModuleInterop": true,
        "forceConsistentCasingInFileNames": true,
        "isolatedModules": true,

        /* Language and Environment */
        "target": "ESNext",

        /* Projects */
        "composite": true,
    },
    "exclude": [
        // Type stubs are not part of the top-level project.
        "web/src/types",

        // This is a separate package with its own TypeScript configuration.
        "help-beta",

        // 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",
    ],
}