normalize-registry-url/index.js

Normalizes a npm registry URL

'use strict'

module.exports = function (registry) {
  if (typeof registry !== 'string') {
    throw new TypeError('`registry` should be a string')
  }
  if (
    registry.endsWith('/') ||
    registry.indexOf('/', registry.indexOf('//') + 2) != -1
  ) return registry
  return `${registry}/`
}