tsconfig.json

{
  // See https://www.typescriptlang.org/tsconfig
  "extends": "./.svelte-kit/tsconfig.json",
  "compilerOptions": {
    // Modules
    "noUncheckedSideEffectImports": true,
    "resolveJsonModule": true,

    // Emit
    "declarationMap": true,
    "sourceMap": true,

    // Interop
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "isolatedDeclarations": true,

    // Language & Environment
    "useDefineForClassFields": true,

    // Completeness
    "skipLibCheck": true,

    // Projects
    "composite": true,

    // Type Checking
    "allowUnreachableCode": false,
    "allowUnusedLabels": false,
    "exactOptionalPropertyTypes": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitOverride": true,
    "noImplicitReturns": true,
    "noPropertyAccessFromIndexSignature": true,
    "noUncheckedIndexedAccess": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "strict": true
  }
}