[Bug?]: yarn workspaces focus <pkg> command fails in ^3.0.0-rc

Self-service

• I’d be willing to implement a fix

Describe the bug

When running the command yarn workspaces focus <pkg> in 3.0-rc versions

Type Error: e.every is not a function
    at test (/frontend/.yarn/releases/yarn-3.0.0-rc.9.cjs:10:36984)

To reproduce

const path = require(`path`);
const {promises: {mkdir, readFile, writeFile, writeJson}} = require(`fs`);

await packageJsonAndInstall({
  "name": "root",
  "private": true,
  "workspaces": [
    "packages/*"
  ]
});


/* create an app module*/

await mkdir('packages/lib', { recursive: true });

await writeFile("packages/lib/package.json", `{
  "peerDependencies": {
    "lodash": "^4.0.0"
  },
  "main": "index.js",
  "name": "lib",
  "version": "0.0.1"
}`);

const version = await yarn('--version');
console.log('version', version);

await yarn(`install`);

await expect(yarn(`workspaces`, `focus`, `lib`)).rejects.not.toThrow();

Environment

System: OS: macOS 11.4 CPU: (4) x64 Intel® Core™ i5-7500 CPU @ 3.40GHz Binaries: Node: 14.2.0 Yarn: 3.0.0-rc.9

Additional context

It seems to be throwing from the typanion package

[merceyz]

You need to update the plugins you’re using as well when you update the CLI

[davidcalhoun]

The specific fix for this:

yarn plugin import @yarnpkg/plugin-workspace-tools

Highly recommend running the same for all your plugins listed in your .yarnrc.yml