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.eslintrc.local.js

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const { resolve, relative } = require('path')

// Create an override to lockdown a file to es6 syntax only

// and only allow it to require an allowlist of files

const rel = (p) => relative(__dirname, resolve(__dirname, p))

const braces = (a) => a.length > 1 ? `{${a.map(rel).join(',')}}` : a[0]

const es6Files = (e) => Object.entries(e).map(([file, allow]) => ({

files: `./${rel(file)}`,

parserOptions: {

ecmaVersion: 6,

},

rules: Array.isArray(allow) ? {

'node/no-restricted-require': ['error', [{

name: ['/**', `!${__dirname}/${braces(allow)}`],

message: `This file can only require: ${allow.join(',')}`,

}]],

} : {},

}))

module.exports = {

rules: {

'no-console': 'error',

},

overrides: es6Files({

'index.js': ['lib/cli.js'],

'bin/npm-cli.js': ['lib/cli.js'],

'lib/cli.js': ['lib/cli/validate-engines.js'],

'lib/cli/validate-engines.js': ['package.json'],

// TODO: This file should also have its requires restricted as well since it

// is an entry point but it currently pulls in config definitions which have

// a large require graph, so that is not currently feasible. A future config

// refactor should keep that in mind and see if only config definitions can

// be exported in a way that is compatible with ES6.

'bin/npx-cli.js': null,

}),

}