Add "unpkg" package

packages/unpkg/README.md

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+The JavaScript API for [https://unpkg.com](unpkg).

packages/unpkg/modules/index.js

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+exports.isBareModuleIdentifier = require('./utils/isBareModuleIdentifier')
+exports.parseModuleIdentifier = require('./utils/parseModuleIdentifier')

packages/unpkg/modules/utils/__tests__/isBareModuleIdentifier-test.js

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+const isBareModuleIdentifier = require('../isBareModuleIdentifier')
+
+describe('isBareModuleIdentifier', () => {
+  it('returns true for bare module identifiers', () => {
+    expect(isBareModuleIdentifier('react')).toBe(true)
+    expect(isBareModuleIdentifier('react-dom')).toBe(true)
+    expect(isBareModuleIdentifier('react-dom/server')).toBe(true)
+  })
+
+  it('returns false for non-bare module identifiers', () => {
+    expect(isBareModuleIdentifier('/absolute-path')).toBe(false)
+    expect(isBareModuleIdentifier('./relative-path')).toBe(false)
+    expect(isBareModuleIdentifier('//www.example.com/script.js')).toBe(false)
+    expect(isBareModuleIdentifier('https://www.example.com/script.js')).toBe(
+      false
+    )
+  })
+})

packages/unpkg/modules/utils/__tests__/parseBareModuleIdentifier-test.js

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+const parseBareModuleIdentifier = require('../parseBareModuleIdentifier')
+
+describe('parseBareModuleIdentifier', () => {
+  it('parses simple identifiers', () => {
+    expect(parseBareModuleIdentifier('react')).toEqual({
+      packageName: 'react',
+      file: ''
+    })
+  })
+
+  it('parses hyphenated identifiers', () => {
+    expect(parseBareModuleIdentifier('react-dom')).toEqual({
+      packageName: 'react-dom',
+      file: ''
+    })
+  })
+
+  it('parses hyphenated identifiers with a filename', () => {
+    expect(parseBareModuleIdentifier('react-dom/server')).toEqual({
+      packageName: 'react-dom',
+      file: '/server'
+    })
+  })
+
+  it('parses scoped identifiers', () => {
+    expect(parseBareModuleIdentifier('@babel/core')).toEqual({
+      packageName: '@babel/core',
+      file: ''
+    })
+  })
+
+  it('parses scoped identifiers with a filename', () => {
+    expect(parseBareModuleIdentifier('@babel/core/package.json')).toEqual({
+      packageName: '@babel/core',
+      file: '/package.json'
+    })
+  })
+})

packages/unpkg/modules/utils/isBareModuleIdentifier.js

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+const URL = require('whatwg-url')
+
+function isBareModuleIdentifier(id) {
+  return !(
+    URL.parseURL(id) !== null || // fully qualified URL
+    id.substr(0, 2) === '//' || // URL w/out protocol
+    ['.', '/'].includes(id.charAt(0)) // local path
+  )
+}
+
+module.exports = isBareModuleIdentifier

packages/unpkg/modules/utils/parseBareModuleIdentifier.js

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+const bareModuleIdentifierFormat = /^((?:@[^\/]+\/)?[^\/]+)(\/.*)?$/
+
+function parseBareModuleIdentifier(id) {
+  const match = bareModuleIdentifierFormat.exec(id)
+
+  return {
+    packageName: match[1],
+    file: match[2] || ''
+  }
+}
+
+module.exports = parseBareModuleIdentifier

packages/unpkg/package.json

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+{
+  "name": "unpkg",
+  "version": "0.1.0",
+  "description": "The JavaScript API for unpkg",
+  "files": [
+    "modules/*.js",
+    "modules/utils/*.js"
+  ],
+  "main": "modules/index.js",
+  "dependencies": {
+    "whatwg-url": "^6.3.0"
+  }
+}

packages/unpkg/yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+lodash.sortby@^4.7.0:
+  version "4.7.0"
+  resolved "https://registry.yarnpkg.com/lodash.sortby/-/lodash.sortby-4.7.0.tgz#edd14c824e2cc9c1e0b0a1b42bb5210516a42438"
+
+punycode@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.0.tgz#5f863edc89b96db09074bad7947bf09056ca4e7d"
+
+tr46@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/tr46/-/tr46-1.0.1.tgz#a8b13fd6bfd2489519674ccde55ba3693b706d09"
+  dependencies:
+    punycode "^2.1.0"
+
+webidl-conversions@^4.0.1:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/webidl-conversions/-/webidl-conversions-4.0.2.tgz#a855980b1f0b6b359ba1d5d9fb39ae941faa63ad"
+
+whatwg-url@^6.3.0:
+  version "6.3.0"
+  resolved "https://registry.yarnpkg.com/whatwg-url/-/whatwg-url-6.3.0.tgz#597ee5488371abe7922c843397ddec1ae94c048d"
+  dependencies:
+    lodash.sortby "^4.7.0"
+    tr46 "^1.0.0"
+    webidl-conversions "^4.0.1"