Creating a concise TypeScript declaration file for an established JavaScript library

Question

Creating a concise TypeScript declaration file for an established JavaScript library

I'm interested in utilizing the neat-csv library, however, I have encountered an issue with it not having a typescript definition file available. Various blogs suggest creating a basic definition file as a starting point:

declare var neatCsv: any;

My concern now is about what to do next with this definition file. Where should it be placed? How can the definition file be linked with the actual implementation located in node_modules/neat-csv? And finally, how can it be imported into an existing typescript file?

javascript typescript typescript2.0

Answer 1

Answer №1

The import syntax for the package used is as follows:

const coolCsv = require('cool-csv');

In this case, you do not need to use exports like { x } or default exports such as export default x. Instead, you should include the following code snippet:

declare module "cool-csv" {
    var coolCsv: (input: any, options?: any) => Promise<any>;
    export = coolCsv;
}

To implement this, create a file named definitions.d.ts in your src directory. After that, you can import and utilize it in the following manner:

import * as coolCsv from "cool-csv";

let data = "name,color\ntiger,orange\nbear,brown";
coolCsv(data, { /* custom options */ });

Answer 2

The import syntax for the package used is as follows:

const coolCsv = require('cool-csv');

In this case, you do not need to use exports like { x } or default exports such as export default x. Instead, you should include the following code snippet:

declare module "cool-csv" {
    var coolCsv: (input: any, options?: any) => Promise<any>;
    export = coolCsv;
}

To implement this, create a file named definitions.d.ts in your src directory. After that, you can import and utilize it in the following manner:

import * as coolCsv from "cool-csv";

let data = "name,color\ntiger,orange\nbear,brown";
coolCsv(data, { /* custom options */ });

Creating a concise TypeScript declaration file for an established JavaScript library

Answer №1

Similar questions

The attribute 'randomUUID' is not found within the 'Crypto' interface

What is the best method to terminate an Electron application using TypeScript?

I can't figure out why I keep receiving the InvalidArgumentError for H.Map with Argument #0 [object Object]

Establishing a global variable in Cypress through a function

Events triggered when the mouse hovers over an element and then moves

Securely import TypeScript modules from file paths that are dynamically determined during execution

Creating multiple AJAX contact forms can be achieved by modifying the code to accommodate multiple forms on a single page. Here's

TypeScript will show an error message if it attempts to return a value and instead throws an

What is the best way to arrange elements based on the numeric value of a data attribute?

Is there a way to retrieve two distinct values from an object?

Generating an array of quarter numbers and year based on the current date in Node.js using Moment.js - a simple guide

Show the helper text when a TextField is selected in Material UI

The submit button fails to produce any result

Performing JavaScript functions after fetching an XSLT page via AJAX

Using PHP to validate a read-only textbox

I have experimented with both POST and GET methods in Node.js, exploring a variety

`Mapping child routes in Angular using basic components`

Cannot get v-if to work with multiple conditions

Include the array in the 'content' property of the CSS using Jquery

What steps do I need to follow to create a 3D shooting game using HTML5 Canvas?