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Feature detect ES modules: both static import and dynamic import()
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| <!-- | |
| Complete feature detection for ES modules. Covers: | |
| 1. Static import: import * from './foo.js'; | |
| 2. Dynamic import(): import('./foo.js').then(module => {...}); | |
| Demo: http://jsbin.com/tilisaledu/1/edit?html,output | |
| Thanks to @_gsathya, @kevincennis, @rauschma, @malyw for the help. | |
| --> | |
| <body></body> | |
| <!-- Remember: static modules have a fallback! --> | |
| <script type="module"> | |
| console.log('This browser supports <script type="module">'); | |
| </script> | |
| <script nomodule> | |
| console.log('This browser DOES NOT support <script type="module">'); | |
| </script> | |
| <script> | |
| // Feature detect static imports. | |
| function supportsStaticImport() { | |
| const script = document.createElement('script'); | |
| return 'noModule' in script; | |
| } | |
| // Feature detect dynamic import(). | |
| function supportsDynamicImport() { | |
| try { | |
| new Function('import("")'); | |
| return true; | |
| } catch (err) { | |
| return false; | |
| } | |
| } | |
| // Usage. | |
| let el = document.createElement('pre'); | |
| el.textContent = ` | |
| Supports ES module static import: ${supportsStaticImport()} | |
| Supports dynamic ES module import(): ${supportsDynamicImport()} | |
| ` | |
| document.body.appendChild(el); | |
| </script> |
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