Module '"@docusaurus/router"' has no exported member 'matchPath'

🐛 Bug Report

Prerequisites

• I’m using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io
• I have read the console error message carefully (if applicable)

Description

I’m using docusaurus in a TypeScript project. When we run tsc -b to build the project, we get this error:

> tsc -b

node_modules/.pnpm/@docusaurus+plugin-content-docs@2.0.0-beta.5_react-dom@17.0.2+react@17.0.2/node_modules/@docusaurus/plugin-content-docs/src/client/docsClientUtils.ts:8:9 - error TS2305: Module '"@docusaurus/router"' has no exported member 'matchPath'.

8 import {matchPath} from '@docusaurus/router';
          ~~~~~~~~~

@docusaurus/plugin-content-docs imports matchPath from @docusaurus/router. But I couldn’t find @docusaurus/router in my node_modules nor https://www.npmjs.com/.

Have you read the Contributing Guidelines on issues?

yes

Steps to reproduce

Use https://new.docusaurus.io to create a CodeSandbox reproducible demo of the bug.

(Write your steps here:)

1. Install @docusaurus/plugin-content-docs@2.0.0-beta.5
2. Use TypeScript to compile the project

Expected behavior

No error.

If @docusaurus/router doesn’t mean to be an NPM package, then maybe docusaurus should export .d.ts files instead of raw .ts files as types.

Actual behavior

Got error.

Your environment

• Public source code: N/A
• Public site URL: N/A
• Docusaurus version used: @docusaurus/plugin-content-docs@2.0.0-beta.5
• Environment name and version (e.g. Chrome 78.0.3904.108, Node.js 10.17.0): Node.js v16.7.0, TypeScript 4.4.2, Pnpm 6.14.5
• Operating system and version (e.g. Ubuntu 20.04.2 LTS): macOS 11.5

Reproducible demo

N/A

[Josh-Cena]

It should be. We tend to add @types/* dependencies in devDeps but I guess it makes more sense to put them in dependencies for module-type-aliases and types whose sole purpose is to provide typings

[ocavue]

@slorber @Josh-Cena After installing @types/react-router-dom and @types/react-helmet as the document said, we don’t get this error anymore. Thank you for your help.

I’m curious why don’t put these two packages as dependencies of Docusaurus so that we users don’t need to install them. I guess there is a reason and I just didn’t think of it.