CODEWITHSUNDEEP
typescript
Freestyle09
Freestyle09

Reputation: 5508

TypeScript 4 - property find does not exist on type number[]

I am learning TypeScript and I have got version 4.0.5 installed. My problem is that i have variable with array of numbers:

const arrayOfNumbers: number[] = [];

And later I am pushing some numbers into it and later I want to find some numbers inside.

arrayOfNumbers.find(el => el === index)

Which throws me an error:

Property 'find' does not exist on type 'number[]'.

But on intellisense I can see find method.

Upvotes: 1

Views: 6828

Answers (3)

Ameer Hamza
Ameer Hamza

Reputation: 1

You can do this by adding the following line to your

tsconfig.json file:"lib": ["e2015"]

After this you may face console.log () error for this if your code is running in a browser environment, you need to add “Dom” to the lib array in your tsconfig.json file, which tells the compiler to include the type definitions for built-in JavaScript APIs found in browser environments, such as the console object. For example:

"lib": [
      // other libs...
      "es6",
      "dom"
    ]

Upvotes: 0

Eray Ismailov
Eray Ismailov

Reputation: 305

Update your tsconfig to target ES2015 or above.

For single file compilations

tsc {filepath} --lib es6

You can reproduce the error here: Typescript Playground

Upvotes: 2

Freestyle09
Freestyle09

Reputation: 5508

The problem here is with tsc compiler. When I want to transplie ts file by using filename:

tsc index.ts

It ignores tsconfig.json. When I transplie simply with:

tsc

An error has gone and I can use now find method from ES6

Source: https://github.com/Microsoft/TypeScript/issues/29473#issuecomment-455601893

Upvotes: 2

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