tsconfig.json

{
    "extends": "./.svelte-kit/tsconfig.json",
    "compilerOptions": {
        // modules
        "allowImportingTsExtensions": true,
        "module": "ESNext",
        "moduleResolution": "Bundler",
        "resolveJsonModule": true,
        // emit
        "downlevelIteration": true,
        "importHelpers": true,
        "sourceMap": true,
        "noEmit": true,
        "noEmitOnError": true,
        // js support
        "allowJs": true,
        "checkJs": true,
        // interop constraints
        "esModuleInterop": true,
        "forceConsistentCasingInFileNames": true,
        "isolatedModules": true,
        // language and env
        "lib": [
            "ESNext",
            "DOM"
        ],
        "target": "ESNext",
        "useDefineForClassFields": true,
        // output formatting
        "noErrorTruncation": true,
        // type checking
        "allowUnreachableCode": false,
        "allowUnusedLabels": false,
        "exactOptionalPropertyTypes": true,
        "strict": true,
        "alwaysStrict": true,
        "strictBindCallApply": true,
        "strictFunctionTypes": true,
        "strictPropertyInitialization": true,
        "strictNullChecks": true,
        "noFallthroughCasesInSwitch": true,
        "noImplicitAny": true,
        "noImplicitOverride": true,
        "noImplicitReturns": true,
        "noImplicitThis": true,
        "noPropertyAccessFromIndexSignature": true,
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "useUnknownInCatchVariables": true
    }
}