Property 'replaceAll' does not exist on type 'string'

Question

I want to use replaceAll in typescript and angular 10.

But I get this error: Property 'replaceAll' does not exist on type 'string'.

This is my code:

let date="1399/06/08"
console.log(date.replaceAll('/', '_'))

Output: 13990608

How can fix my typescript to show me this function?

Answer 1

You should be able to add those typings through your tsconfig.json. Add "ES2021.String" to lib inside compilerOptions.

Your tsconfig should then look something like this:

{
    ...,
    "compilerOptions": {
        ...,
        "lib": [
          ...,
          "ES2021.String"
        ]
    }
}

The replaceAll method is defined inside lib.es2021.string.d.ts as follows:

interface String {
    /**
     * Replace all instances of a substring in a string, using a regular expression or search string.
     * @param searchValue A string to search for.
     * @param replaceValue A string containing the text to replace for every successful match of searchValue in this string.
     */
    replaceAll(searchValue: string | RegExp, replaceValue: string): string;

    /**
     * Replace all instances of a substring in a string, using a regular expression or search string.
     * @param searchValue A string to search for.
     * @param replacer A function that returns the replacement text.
     */
    replaceAll(searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string;
}