Most answered questions in TypeSript

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How to install and run Typescript locally in npm?

It took me a while to figure ...READ MORE

Jun 8, 2022 in TypeSript by Nina
 • 3,060 points • 3,782 views
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1 answer

How to create enum type in TypeScript?

TypeScript 0.9+ has a specification for enums: enum ...READ MORE

Jun 8, 2022 in TypeSript by Nina
 • 3,060 points • 658 views
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TypeScript error: "'Foo' only refers to a type, but is being used as a value here."?

To do type checking at runtime with ...READ MORE

Jun 8, 2022 in TypeSript by Nina
 • 3,060 points • 47,420 views
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1 answer

TypeScript: Class Constructor type

class Zoo<T extends Animal> { ...READ MORE

Jun 8, 2022 in TypeSript by Nina
 • 3,060 points • 2,743 views
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1 answer

TypeScript TS7015: Element implicitly has an 'any' type because index expression is not of type 'number'

If you want a key/value data structure ...READ MORE

Jun 7, 2022 in TypeSript by Nina
 • 3,060 points • 14,893 views
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1 answer

Square brackets around vs after expression in Typescript

x is an Array, while y is a Tuple. The ...READ MORE

Jun 7, 2022 in TypeSript by Nina
 • 3,060 points • 3,278 views
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1 answer

TypeScript ES6: import module "File is not a module error"

We need the export, as a part of ...READ MORE

Jun 7, 2022 in TypeSript by Nina
 • 3,060 points • 14,472 views
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1 answer

Angular ForEach in Typescript?

Try this: selectChildren(data, $event) { ...READ MORE

Jun 7, 2022 in TypeSript by Nina
 • 3,060 points • 1,087 views
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1 answer

What is record in TypeScript

A Record<K, T> is an object type whose property ...READ MORE

Jun 7, 2022 in TypeSript by Nina
 • 3,060 points • 6,254 views
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1 answer

TypeScript: 'tsc command not found'

A few tips in order restart the terminal restart ...READ MORE

Jun 7, 2022 in TypeSript by Nina
 • 3,060 points • 14,197 views
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1 answer

Where to find TypeScript version in Visual Studio?

If you only have TypeScript installed for ...READ MORE

Jun 7, 2022 in TypeSript by Nina
 • 3,060 points • 1,694 views
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1 answer

Is it possible to extend types in Typescript?

you can intersect types: type TypeA = { ...READ MORE

Jun 7, 2022 in TypeSript by Nina
 • 3,060 points • 422 views
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1 answer

Typescript: Can't find names - Error: cannot find name

A known issue: https://github.com/angular/angular/issues/4902 Core reason: the .d.ts file implicitly included ...READ MORE

Jun 7, 2022 in TypeSript by Nina
 • 3,060 points • 10,264 views
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1 answer

How to use moment.js library in angular 2 typescript app?

REFERENCE: https://momentjs.com/docs/#/use-it/typescript/ You can install this by using: npm install ...READ MORE

Jun 1, 2022 in TypeSript by Nina
 • 3,060 points • 1,353 views
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1 answer

Measuring web performance metrices in TypeScript front end program

The performance metrics are provided by the ...READ MORE

Jun 1, 2022 in TypeSript by Nina
 • 3,060 points • 340 views
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1 answer

How to fix Definition for rule typescript-eslint no-use-before-declare was not found eslint typescript-eslint no-use-before-declare

Well according to this page, this rule is ...READ MORE

Jun 1, 2022 in TypeSript by Nina
 • 3,060 points • 17,568 views
0 votes
1 answer

What does the ! (exclamation mark) do in TypeScript?

The exclamation mark is called the non-null ...READ MORE

Jun 1, 2022 in TypeSript by Nina
 • 3,060 points • 952 views
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1 answer

How do you typecast in TypeScript?

Casting: return this.createMarkerStyle(<MarkerSymbolInfo> symbolInfo); Or Casting compatible with tsx mode: return ...READ MORE

Jun 1, 2022 in TypeSript by Nina
 • 3,060 points • 404 views
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1 answer

Typescript Errors: How do I ignore the error "property does not exist on value of type"

The easiest solution to this is: (y as ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 9,086 views
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1 answer

TypeScript: How do you loop through a dictionary?

To loop over the key/values, use a for ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 3,894 views
0 votes
1 answer

How do you run TypeScript files from command line?

You can leave tsc running in watch mode using tsc ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 562 views
0 votes
1 answer

What does <T> do in TypeSript?

This is a TS Generics declaration. T will be declared ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 368 views
0 votes
1 answer

Interface type check with Typescript

You can achieve what you want without ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 5,203 views
0 votes
1 answer

VS Code enforces semicolons, but why doesn't Angular and TypeScript not use it consistently?

JavaScript has a syntactic feature known as semicolon ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 4,262 views
0 votes
1 answer

What is "not assignable to parameter of type never" error in TypeScript?

All you have to do is define ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 49,868 views
0 votes
1 answer

How to declare and initialize a Dictionary in Typescript

Apparently this doesn't work when passing the ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 5,703 views
0 votes
1 answer

What is TypeScript and why would I use it in place of JavaScript?

TypeScript is a superset of JavaScript which primarily ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 341 views
0 votes
1 answer

TypeScript error TS2304: cannot find name ' require'

Here's a really easy work around: declare var ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 12,769 views
0 votes
1 answer

How to create ES6 Map in Typescript

Refer this as an example this.configs = new ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 445 views
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1 answer

Cast a JSON Object to a TypeScript class

I had the same issue and this ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 2,710 views
0 votes
1 answer

TypeScript Object assign gives me an error property assign does not exist on type ObjectConstructor

For TypeScript 2.1 and higher, you can ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 1,574 views
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1 answer

Conversion from both keys and values of object

You could just change the declaration of ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 284 views
0 votes
1 answer

What's the difference between class and interface in TypeScript? When do you use them?

A class is a blueprint of how ...READ MORE

May 31, 2022 in TypeSript by Nina
 • 3,060 points • 401 views
0 votes
1 answer

Now I know what 'pick' does. But I want to do the opposite and remove values from an object.

You can use the keyword Omit for ...READ MORE

May 27, 2022 in TypeSript by Nina
 • 3,060 points • 331 views
0 votes
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Javascript Arrays Opposite of Includes

What is the proper approach to remove ...READ MORE

Aug 8, 2022 in TypeSript by krishna
 • 2,820 points • 1,984 views
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What is the way of declaring an array in JavaScript?

These are some of the way to ...READ MORE

Aug 3, 2022 in TypeSript by krishna
 • 2,820 points • 245 views
0 votes
0 answers

Angular & eslint - Definition for rule '@typescript-eslint/space-infix-ops' was not found

I recently removed the tslint from my ...READ MORE

Aug 1, 2022 in TypeSript by Elton
 • 400 points • 909 views
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0 answers

Typescript open-api cilent generation and usage of `fetch`

I am trying to generate a typescript ...READ MORE

Jul 18, 2022 in TypeSript by Logan
 • 2,140 points • 1,285 views
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Why typescript complains that XXX is assignable to the constraint of type 'T', but 'T' could be instantiated with a different subtype of constraint X?

My code is this: export interface TreeItem { ...READ MORE

Jul 18, 2022 in TypeSript by Logan
 • 2,140 points • 1,283 views
0 votes
0 answers

What is TypeScript and why would I use it in place of JavaScript?

Can you please describe what the TypeScript ...READ MORE

Jul 18, 2022 in TypeSript by Logan
 • 2,140 points • 215 views
0 votes
0 answers

TypeScript types to restrict array values

Can I use TypeScript types to restrict ...READ MORE

Jul 18, 2022 in TypeSript by Logan
 • 2,140 points • 761 views
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0 answers

User-Defined Extended Enums in TypeScript

I am writing a TypeScript library that ...READ MORE

Jul 18, 2022 in TypeSript by Logan
 • 2,140 points • 505 views
0 votes
0 answers

TypeScript: Typing the result of an external module's non-mutating extension function

Let's say I'm using external package "foo". ...READ MORE

Jul 18, 2022 in TypeSript by Logan
 • 2,140 points • 285 views
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0 answers

Typescript: Changing the definition of some third party types d.ts

I am a little bit lost how ...READ MORE

Jul 18, 2022 in TypeSript by Logan
 • 2,140 points • 823 views
0 votes
0 answers

TypeScript type cast & D3.js errors

Now, how should I solve this/typecast this? import ...READ MORE

Jul 18, 2022 in TypeSript by Logan
 • 2,140 points • 1,238 views
0 votes
0 answers

Typescript: Clicking 'X' doesn't successfully close my popup banner

I've created a popup banner with the ...READ MORE

Jul 14, 2022 in TypeSript by Logan
 • 2,140 points • 593 views
0 votes
0 answers

How to watch typescript files in the background continuously without blocking the terminal?

Is there a way to run tsc ...READ MORE

Jul 14, 2022 in TypeSript by Logan
 • 2,140 points • 287 views
0 votes
0 answers

Applying pdf watermark at typescript side

I am trying to add a watermark ...READ MORE

Jul 14, 2022 in TypeSript by Logan
 • 2,140 points • 304 views
0 votes
0 answers

Jest + Typescript cannot mock AWS transcribe function

I've been trying to figure out how ...READ MORE

Jul 14, 2022 in TypeSript by Logan
 • 2,140 points • 1,036 views
0 votes
0 answers

Alternative to decorate function in TypeScript

Since TypeScript allows decorate only class, method, ...READ MORE

Jul 14, 2022 in TypeSript by Logan
 • 2,140 points • 271 views
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