Error: Failed to load plugin 'unicorn' declared in 'BaseConfig » /home/yoursunny/xobug/node_modules/xo/config/plugins.js': Cannot find module '@babel/core'

[yoursunny]

Snippet to Reproduce

package.json

{
  "private": true,
  "dependencies": {
    "xo": "^0.37.1"
  }
}

1.js

console.log("OK");

Actual Behavior

$ ./node_modules/.bin/xo 1.js
Error: Failed to load plugin 'unicorn' declared in 'BaseConfig » /home/yoursunny/xobug/node_modules/xo/config/plugins.js': Cannot find module '@babel/core'
Require stack:
- /home/yoursunny/xobug/node_modules/@babel/eslint-parser/lib/index.js
- /home/yoursunny/xobug/node_modules/eslint-template-visitor/lib/index.js
- /home/yoursunny/xobug/node_modules/eslint-template-visitor/index.js
- /home/yoursunny/xobug/node_modules/eslint-plugin-unicorn/rules/import-style.js
- /home/yoursunny/xobug/node_modules/import-modules/index.js
- /home/yoursunny/xobug/node_modules/eslint-plugin-unicorn/index.js
- /home/yoursunny/xobug/node_modules/@eslint/eslintrc/lib/config-array-factory.js
- /home/yoursunny/xobug/node_modules/@eslint/eslintrc/lib/index.js
- /home/yoursunny/xobug/node_modules/eslint/lib/cli-engine/cli-engine.js
- /home/yoursunny/xobug/node_modules/eslint/lib/cli-engine/index.js
- /home/yoursunny/xobug/node_modules/eslint/lib/api.js
- /home/yoursunny/xobug/node_modules/xo/index.js
- /home/yoursunny/xobug/node_modules/xo/cli-main.js
- /home/yoursunny/xobug/node_modules/xo/cli.js
Referenced from: /home/yoursunny/xobug/node_modules/xo/config/plugins.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)
    at Function.Module._load (internal/modules/cjs/loader.js:725:27)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at Object.<anonymous> (/home/yoursunny/xobug/node_modules/@babel/eslint-parser/lib/index.js:11:13)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Module.require (internal/modules/cjs/loader.js:952:19)

Expected Behavior

No error.

[sindresorhus]

What Node.js and npm version?

[yoursunny]

$ node --version
v14.15.4

$ npm --version
6.14.10

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.5 LTS
Release:	18.04
Codename:	bionic

[sindresorhus]

Try upgrading to the latest npm version (v7) and then run: npm cache clean -fg && rm -rf ./node_modules && npm i

[yoursunny]

This issue does not occur with NPM 7.5.4.
Thus, I'd recommend adding an engine.npm = ^7.5.0 restriction in package.json.

This issue still occurs with PNPM 5.17.2, even with NPM 7 installed.
It used to work with pnpm install --shamefully-hoist but suddenly stopped working this week.
Any idea why this may happen?

[fregante]

Closing in favor of #546