Utilize @types for the Typescript npm library without the need for downstream projects to install this dependency

Our npm library package, built in TypeScript and known as lib-utils, provides a range of utilities for other projects to leverage.

One of the dependencies within lib-utils is d3, which is both a peerDependency and a devDependency. Additionally, there is a devDependency on @types/d3.

While not all projects utilizing lib-utils will require the d3 functionality it offers, some of our source files still import d3 using import * as d3 from "d3" to ensure compile-time checks. This inadvertently places a runtime requirement on d3 for any upstream project using lib-utils. The result? 404 errors when trying to load d3 in the browser.

We've attempted various solutions, such as:

  1. /// <reference path="../../node_modules/@types/d3/index.d.ts" />
  2. /// <reference type="d3">

However, we are unable to resolve compilation issues without resorting to the regular module import method, leading to the current dilemma.

Is there a way to maintain TypeScript type checking in lib-utils without mandating that users provide d3, especially if they do not intend to use its features?

Our packaging relies on systemjs. While a solution instructing systemjs to overlook d3 could be an option, ideally, we'd like to address this directly within lib-utils instead of requiring modifications from each individual consumer.

typescriptnpmsystemjs

Answer №1

Instead of just configuring systemjs like you mentioned, another approach is to specifically import only the types required in your import statement.

The issue arises when using import * as d3 from 'd3', as the compiler assumes you need the entire d3 library, including the code portion.

To solve this problem, you should use:

import { SomeType, SomeOtherType } from 'd3'

// continue with your code

By importing only the necessary types, the compiler will optimize and remove any unnecessary imports from your JavaScript.

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