v1.0.0

.gitignore

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+dist
+node_modules
+.DS_Store
+*.log

.npmignore

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+*.log
+.travis.yml
+index.js
+package-lock.json
+rollup.config.js
+test.js
+yarn.lock

.travis.yml

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+language: node_js
+node_js:
+  - "node"
+jobs:
+  include:
+    - script: yarn test
+    - stage: publish
+      if: tag IS present
+      node_js: "node"
+      script: yarn build
+      deploy:
+        provider: npm
+        email: "$NPM_EMAIL"
+        api_key: "$NPM_TOKEN"
+        skip_cleanup: true
+        on:
+          tags: true

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2018 Jason Chung
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# @shinin/load-script · [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/shiningjason/load-script/blob/master/LICENSE) [![npm](https://img.shields.io/npm/v/@shinin/load-script.svg)](https://www.npmjs.com/package/@shinin/load-script) [![Build Status](https://travis-ci.org/shiningjason/load-script.svg?branch=master)](https://travis-ci.org/shiningjason/load-script)
+
+`@shinin/load-script` is a simple async script loader for modern browsers.
+
+### 3 seconds quick view
+
+```js
+import loadScript from '@shinin/load-script'
+
+export default async function loadSDK() {
+  await loadScript('http://foo.bar/sdk.js')
+  // Now, you can do what you want after SDK.js has loaded...
+}
+```
+
+## Installation
+```
+npm install @shinin/load-script --save
+```
+
+Also you can use `@shinin/load-script` as a `<script>` tag from a [CDN](https://unpkg.com/@shinin/load-script).
+
+```html
+<!-- Use promise-polyfill only if you want to support old browsers. -->
+<!-- <script src="https://unpkg.com/promise-polyfill"></script> -->
+<script src="https://unpkg.com/@shinin/load-script"></script>
+```
+
+## Browser Support
+
+- Chrome
+- Firefox
+- Safari 7.1+
+- Safari 5.1+ (Use [promises-polyfill](https://github.com/taylorhakes/promise-polyfill))
+- IE 8+ (Use [promises-polyfill](https://github.com/taylorhakes/promise-polyfill))
+
+## License
+
+[MIT](https://github.com/shiningjason/load-script/blob/master/LICENSE)

index.js

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+const promises = {}
+
+export default src => {
+  const doc = document
+  if (promises[src]) return promises[src]
+
+  let onLoadSuccess, onLoadError
+  promises[src] = new Promise((resolve, reject) => {
+    onLoadSuccess = resolve
+    onLoadError = reject
+  })
+
+  let loaded = false
+  const tag = 'script'
+  const script = doc.createElement(tag)
+  script.src = src
+  script.async = 1
+  script.onreadystatechange = script.onload = () => {
+    const { readyState } = script
+    if (readyState && !['complete', 'loaded'].includes(readyState)) return
+    if (loaded) return
+    loaded = true
+    onLoadSuccess()
+  }
+  script.onerror = onLoadError
+
+  const firstScript = doc.querySelector(tag)
+  firstScript.parentNode.insertBefore(script, firstScript)
+
+  return promises[src]
+}

package.json

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+{
+  "name": "@shinin/load-script",
+  "version": "1.0.0",
+  "description": "Load script asynchronously.",
+  "main": "dist/load-script.cjs.js",
+  "module": "dist/load-script.esm.js",
+  "browser": "dist/load-script.min.js",
+  "repository": "https://github.com/shiningjason/load-script",
+  "author": "Jason Chung <shiningjason1989@gmail.com>",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "keywords": [
+    "browser",
+    "script",
+    "load",
+    "load-js",
+    "async",
+    "promise"
+  ],
+  "scripts": {
+    "format": "prettier --single-quote --no-semi --write *.js",
+    "lint": "eslint *.js",
+    "build": "rollup --config",
+    "test": "NODE_ENV=test mocha test --require @babel/register"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.1.5",
+    "@babel/preset-env": "^7.1.5",
+    "@babel/register": "^7.0.0",
+    "eslint": "^5.8.0",
+    "eslint-config-prettier": "^3.1.0",
+    "eslint-config-standard": "^12.0.0",
+    "eslint-plugin-import": "^2.14.0",
+    "eslint-plugin-node": "^8.0.0",
+    "eslint-plugin-promise": "^4.0.1",
+    "eslint-plugin-standard": "^4.0.0",
+    "jsdom": "^13.0.0",
+    "mocha": "^5.2.0",
+    "prettier": "^1.15.1",
+    "rollup": "^0.67.0",
+    "rollup-plugin-babel": "^4.0.3",
+    "rollup-plugin-uglify": "^6.0.0"
+  },
+  "babel": {
+    "env": {
+      "test": {
+        "presets": [
+          "@babel/env"
+        ]
+      }
+    }
+  },
+  "eslintConfig": {
+    "extends": [
+      "standard",
+      "prettier",
+      "prettier/standard"
+    ]
+  }
+}

rollup.config.js

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+import babel from 'rollup-plugin-babel'
+import { uglify } from 'rollup-plugin-uglify'
+import pkg from './package.json'
+
+const input = './index.js'
+const babelPlugin = babel({
+  babelrc: false,
+  exclude: 'node_modules/**',
+  presets: [['@babel/env', { modules: false }]]
+})
+
+export default [
+  {
+    input,
+    output: [
+      {
+        file: pkg.main,
+        format: 'cjs',
+        interop: false
+      },
+      {
+        file: pkg.module,
+        format: 'esm'
+      }
+    ],
+    plugins: [babelPlugin]
+  },
+  {
+    input,
+    output: {
+      file: pkg.browser,
+      format: 'iife',
+      name: 'loadScript'
+    },
+    plugins: [babelPlugin, uglify()]
+  }
+]

test.js

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+/* global beforeEach describe it */
+import assert from 'assert'
+import { JSDOM } from 'jsdom'
+
+const testScript = 'https://unpkg.com/fetch'
+const htmlTemplate = '<!DOCTYPE html><body></body></html>'
+
+function reRequire(module) {
+  delete require.cache[require.resolve(module)]
+  return require(module)
+}
+
+describe('loadScript', () => {
+  const jsdom = new JSDOM(htmlTemplate)
+  global.document = jsdom.window.document
+  let loadScript
+
+  beforeEach(() => {
+    global.document.body.innerHTML = '<script></script>'
+    loadScript = reRequire('./')
+  })
+
+  it('should return promise', () => {
+    const promise = loadScript(testScript)
+    assert(promise instanceof Promise)
+  })
+
+  it('should load script successfully', done => {
+    loadScript(testScript).then(done)
+    const element = document.querySelector('[src]')
+    element.onload()
+  })
+
+  it('should handle loading error', done => {
+    loadScript(testScript).then(() => {}, done)
+    const element = document.querySelector('[src]')
+    element.onerror()
+  })
+})