tsconfig.json

{
  "extends": "@tsconfig/svelte/tsconfig.json",
  "include": ["src/**/*.ts"],
  "exclude": ["node_modules/*"],
  "compilerOptions": {
    "baseUrl": "./src/",
    "inlineSources": true,
    "module": "ESNext",
    "target": "ESNext",
    "esModuleInterop": true,
    "allowJs": true,
    "moduleResolution": "node",
    "importHelpers": true,
    "lib": ["dom", "es5", "scripthost", "es2015"],
    "types": ["node", "svelte", "jest"],
    "alwaysStrict": true,
    "noImplicitAny": true,
    "noImplicitThis": true,
    "strictBindCallApply": true,
    "strictFunctionTypes": true,
    "strictNullChecks": true,
    "strictPropertyInitialization": true,
    "useUnknownInCatchVariables": true,
    "verbatimModuleSyntax": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "noUncheckedIndexedAccess": true,
    "noPropertyAccessFromIndexSignature": true,
    "noImplicitOverride": true,
    "allowSyntheticDefaultImports": true
  }
}