⠏ [20/94] Installing eslint@^5.0.1[gh-pages@github:rschamp/gh-pages#publish-branch-to-subfolder] install gh-pages from git github:rschamp/gh-pages#publish-branch-to-subfolder, may be very slow, please keep patience
✖ Install fail! Error: [scratch-audio@0.1.0-prerelease.20190114210212] Can't find package scratch-audio's version: 0.1.0-prerelease.20190114210212
Error: [scratch-audio@0.1.0-prerelease.20190114210212] Can't find package scratch-audio's version: 0.1.0-prerelease.20190114210212
at resolve (/usr/local/lib/node_modules/cnpm/node_modules/npminstall/lib/download/npm.js:97:11)
at resolve.next ()
at onFulfilled (/usr/local/lib/node_modules/cnpm/node_modules/co/index.js:65:19)
at process._tickCallback (internal/process/next_tick.js:68:7)
npminstall version: 3.20.1

by mac

I met the same issue when I use npm mirror from https://registry.npm.taobao.org. I know that it's a nightmare if you try to use official npm repo in China.

Here is my workaround solution:

1. Remove node_modules directory and package-lock.json if any to make sure we start form scratch: rm -rf node_modules. Also, you need to make sure everything is not changed, especially for package.json file. You can do this by typing git status in scratch-gui directory and check the result.
2. Use official npm repo to install scratch-audio@0.1.0-prerelease.20190114210212. For example npm install scratch-audio@0.1.0-prerelease.20190114210212
3. Install other scratch prerelease dependencies by using official npm repo. For example npm install scratch-paint@0.2.0-prerelease.20190114205252 scratch-render@0.1.0-prerelease.20190122223537 scratch-svg-renderer@0.2.0-prerelease.20190110205335 scratch-vm@0.2.0-prerelease.20190123164824.
4. Use taobao mirror to install other packages to speed up the installation process: cnpm install. If it's said that cnpm is not defined, refer to https://npm.taobao.org.
5. Fix peer dependencies issue. For example, if npm said npm WARN eslint-config-scratch@5.0.0 requires a peer of babel-eslint@^8.0.1 but none is installed. You must install peer dependencies yourself., you can just type npm install eslint-config-scratch@5.0.0. Make sure to use official npm repo again in this time. This will avoid the taobao mirror cache.
6. After fix all peer dependencies, try npm start, you should see the beautiful scratch 3.0 on localhost:8601

PS. Here is my environment:

1. Mac OS
2. Node v10.4.0 - Wiki said that we need use node 8, I am not sure it's because the Wiki is obsolete or node 10 will have some other compatibility issue.
3. npm v6.4.0