What is the process for specifying a data type for a pre-existing npm package module?

I am currently working on converting a codebase that utilizes nodemailer along with the nodemailer-html-to-text plugin to TypeScript.

While nodemailer has @types definitions available, the same is not true for nodemailer-html-to-text.

How can I go about creating custom type definitions for this module?

I attempted to create a file named 

@types/nodemailer-html-to-text.d.ts
in my project: 

declare module 'nodemailer-html-to-text' {
}

My goal is to have this file export a function definition htmlToText of type Mail.PluginFunction, but I am unsure of how to proceed…

typescriptnpmnodemailer

Answer №1

discovered the solution at this module-plugin.d.ts location: 

declare module 'nodemailer-html-to-text' {
  import * as Mail from 'nodemailer/lib/mailer'
  export function htmlToText(): Mail.PluginFunction
}

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