unbundle/src/importResolve.js

`require()` and `import`/`export` in the browser, without the bundling

import {dirname, relative, join} from 'path'
import {trimBefore} from './trimBefore'
import slash from 'slash'

export const parse = (file, output, destination) => (basedir, dependency, source, filename) => {
  let result = relative(basedir, dependency)

  if (result.includes('node_modules')) {
    const up = relative(dirname(output), destination)
    const over = result::trimBefore('node_modules')
    result = join(up, over)
  }

  if (!result.startsWith('.')) {
    result = './' + result
  }

  return slash(result)
}