feat: expose cli entrance

[zanminkian]

Expose cli entrance will be convenient for developers who want to integrate lint-stage cli.

[iiroj]

Hello, can you give an example on what can be done with this?

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (b4048c4) compared to base (a987e6a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1237   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files           26        26           
  Lines          735       735           
  Branches       198       198           
=========================================
  Hits           735       735           

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[zanminkian]

Hi. I have a convenient cli tool that integrates lint-staged, commitlint and husky. By setting up postinstall, this tools can init all the things in zero configs. commitlint is easy to integrate because it don't have exports field in its package.json. But lint-staged have this limitation. I have to write a function getLintStagedCliPath in my tool, which is not elegant.

import { existsSync } from 'fs'
import { join } from 'path'

export function getLintStagedCliPath(from: string, paths = ['.']): string {
  if (!from.startsWith('/'))
    throw new Error('First param `from` must be absolute path')

  const dirAbsolutePath = join(from, ...paths)
  const filePath = 'node_modules/lint-staged/bin/lint-staged.js'
  const isExisting = existsSync(join(dirAbsolutePath, filePath))
  if (isExisting) {
    const result = join(...paths, filePath)
    return result.startsWith('.') ? result : `./${result}`
  }
  if (dirAbsolutePath === '/')
    throw new Error('`lint-staged` cli file not found!')

  return getLintStagedCliPath(from, [...paths, '..'])
}