Async, Promises & Error Handling Types

78 lessons in TypeScript

• Typing for-await-of Loop VariablesFlashcard
• Typing .then() and .catch() HandlersFlashcard
• Why Promise Rejections Aren't TypedSlides / Video
• Void-Returning Promises and Fire-and-ForgetSlides / Video
• Typing Promise Executor CallbacksSlides / Video
• Result Union Types for Success and FailureSlides / Video
• Custom Error Classes and Typing ThemSlides / Video
• The useUnknownInCatchVariables FlagSlides / Video
• Narrowing unknown Errors in catchSlides / Video
• Catch Clause Errors Are unknownSlides / Video
• Typing race, allSettled, and anySlides / Video
• Typing Promise.all Tuple ResultsSlides / Video
• Typing await and Unwrapped ValuesSlides / Video
• The Promise<T> Type ParameterSlides / Video
• Async Function Return TypesSlides / Video
• Chained then Return ValueCode Quiz
• Narrowing an unknown ErrorCode Quiz
• Typing the Executor CallbackCode Quiz
• instanceof Error NarrowingCode Quiz
• catch Variable Is unknownCode Quiz
• Typing catch Handler ParameterCode Quiz
• Custom Error Class TypingCode Quiz
• Reading allSettled ResultsCode Quiz
• Wrong Resolved Value Type in PromiseCode Quiz
• Floating Promise Not AwaitedCode Quiz
• Discriminated Result TypeCode Quiz
• Typing an async GeneratorCode Quiz
• Iterating an AsyncIterableCode Quiz
• async Function Returning voidCode Quiz
• Always-Throwing Function Return TypeCode Quiz
• Promise Type Has One ParameterCode Quiz
• Typing an async Arrow FunctionCode Quiz
• Typing Promise.resolve and rejectCode Quiz
• Awaiting a Non-Promise ValueCode Quiz
• Promise.all Result Tuple TypesCode Quiz
• await Outside an async FunctionCode Quiz
• Awaiting Unwraps the Value TypeCode Quiz
• Async Function Return TypeCode Quiz
• Typing a Promise with Promise<T>Code Quiz
• Promise.race Return TypeCode Quiz
• Typing Promise.all Result TuplesQuiz
• Floating Promise ConcernsQuiz
• void vs Promise<void> in Async ContextsQuiz
• Typing Callback-to-Promise WrappersQuiz
• for await...of Element TypingQuiz
• Async Generators and AsyncIterable TypesQuiz
• Typing then/catch Callback ChainsQuiz
• Result / Either Pattern for Typed ErrorsQuiz
• never Return Type for Throwing FunctionsQuiz
• Typing Rejected Promise ValuesQuiz
• Custom Error Class TypingQuiz
• instanceof Error Narrowing in catchQuiz
• Narrowing Errors in catch BlocksQuiz
• useUnknownInCatchVariables FlagQuiz
• catch Clause Variable TypingQuiz
• Promise Executor and resolve/reject TypingQuiz
• Typing Promise.allSettled Result ShapeQuiz
• Typing Promise.race and Promise.anyQuiz
• Typing async Function Return ValuesQuiz
• Promise<T> Type AnnotationQuiz
• await Expression Result TypesQuiz
• Errors Are Typed as unknown in catchFlashcard
• The Promise<T> TypeFlashcard
• Explicitly Annotating async Return TypesFlashcard
• useUnknownInCatchVariables FlagFlashcard
• Narrowing Caught Errors with instanceofFlashcard
• Void vs Undefined Return in Async CallbacksFlashcard
• Typing Promise Resolution ValuesFlashcard
• Typing Promise.all Results as a TupleFlashcard
• Typing Promise.race and Promise.allSettledFlashcard
• Custom Error Class TypingFlashcard
• Typing the Promise Executor CallbacksFlashcard
• The never Type in Throwing FunctionsFlashcard
• Result/Either Pattern for Error HandlingFlashcard
• Chaining Promises and Return Type FlowFlashcard
• PromiseSettledResult TypesFlashcard
• Awaiting a Promise and the Resulting TypeFlashcard
• async Function Return Type InferenceFlashcard