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TypeScriptWorking with JavaScript & Type Declarations

39 items

1

Automatic Type Acquisition

Quiz
2

Typing the global Object

Quiz
3

@ts-check and @ts-nocheck

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4

@ts-ignore vs @ts-expect-error

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5

Purpose of Declaration Files

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6

The declare Keyword

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7

Ambient Variable and Function Declarations

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8

Installing @types Packages

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9

Declaring Untyped Modules

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10

Gradual JS to TS Migration

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11

declare namespace Usage

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12

@param and @type Precision

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13

JSDoc Type Annotations

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14

UMD Global Declaration Syntax

Code Quiz
15

JSDoc @type Annotation

Code Quiz
16

JSDoc @param and @returns

Code Quiz
17

Implicit any from JS Import

Code Quiz
18

Overloaded Signatures in .d.ts

Code Quiz
19

declare namespace Members

Code Quiz
20

Ambient const enum

Code Quiz
21

Ambient Class Shape

Code Quiz
22

Ambient Variable with declare

Code Quiz
23

Ambient Function Signature

Code Quiz
24

Value Inside a .d.ts File

Code Quiz
25

Triple-Slash Reference Syntax

Code Quiz
26

Installing @types Packages

Code Quiz
27

Ambient Global Variables

Flashcard
28

Ambient Functions

Flashcard
29

JSDoc for Typing JavaScript

Flashcard
30

@ts-ignore vs @ts-expect-error

Flashcard
31

Triple-Slash Directives

Flashcard
32

The declare Keyword

Flashcard
33

@ts-check and @ts-nocheck

Flashcard
34

Global Augmentation with declare global

Flashcard
35

Gradual JS to TS Migration

Flashcard
36

Structure of an @types Package

Flashcard
37

Wildcard Module Declarations

Flashcard
38

Handling Implicit any

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39

Installing @types Packages

Flashcard
Code QuizIntermediate

Overloaded Signatures in .d.ts

Find the mistake in a set of overloaded function declarations.

Codetypescript
// utils.d.ts
declare function parse(input: string): string[];
declare function parse(input: number): number[];
declare function parse(input: string | number): string[] | number[] {
  return [];
}

What is the bug in these overload declarations?