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

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