konva/tsconfig.json

{
  "compilerOptions": {
    "outDir": "lib",
    "target": "ES2018",
    "lib": ["ES2019", "dom"],
    "module": "nodenext",
    "noUncheckedSideEffectImports": true,
    "rewriteRelativeImportExtensions": true,
    "isolatedModules": true,
    "erasableSyntaxOnly": true,
    "verbatimModuleSyntax": true,
    // "sourceMap": true,
    "noEmitOnError": true,
    "declaration": true,
    "removeComments": false,

    "strict": true,
    "noImplicitAny": false,
    "noImplicitThis": false,
    "useUnknownInCatchVariables": false,
    "skipLibCheck": true,
    // probably we would never enable this one
    // because it's too strict, konva generates many functions on the runtime
    "strictPropertyInitialization": false,
    // our initializer `field: GetSet<string, this>` will cause `field` to
    // be set to undefined if target>=ES2022, this also affects tools like `tsx` running locally
    // https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#the-usedefineforclassfields-flag-and-the-declare-property-modifier
    "useDefineForClassFields": false
  },
  "include": ["src"]
}