tsconfig.json

{
  "compilerOptions": {
    "moduleResolution": "nodenext",
    "allowJs": true,
    "checkJs": true,
    "strict": true,
    "noImplicitThis": true,
    "useUnknownInCatchVariables": true,
    "alwaysStrict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "exactOptionalPropertyTypes": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "noUncheckedIndexedAccess": true,
    "noImplicitOverride": true,
    "noPropertyAccessFromIndexSignature": true,
    "allowUnusedLabels": true,
    "allowUnreachableCode": true,
    "skipLibCheck": true,
    "declaration": true,
    "declarationDir": ".",
    "emitDeclarationOnly": true,
    "lib": ["ES2016", "DOM"],
    "typeRoots": ["@types"]
  },
  "include": ["src/**/*", "test/**/*.js"],
  "exclude": ["node_modules", "coverage", "test/**/*.svelte"]
}