how to use the tostring function from the underscore library in typescript

To use the toString function from the underscore library in TypeScript, you need to:

1. Install the underscore library:

index.ts
npm install underscore
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2. Install the type definitions for underscore:

index.ts
npm install @types/underscore
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3. Import the underscore library at the top of your TypeScript file:

index.ts
import * as _ from 'underscore';
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4. Use the toString function in your code:

index.ts
const myNumber: number = 42;
const myString: string = _.toString(myNumber);
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Note that since TypeScript is a strongly-typed language, you need to explicitly declare the type of the variable that you pass as an argument to the toString function. In this example, we're passing a number variable, so we need to declare the myNumber variable as number.

Also, make sure that you have properly configured your TypeScript project to use the underscore library and its type definitions.