Introducing ES Module Support in 75CDN: Usage Guide and Browser Compatibility

75CDN is a static resource hosting platform maintained by the 360 front‑end team (奇舞团) that has been operating stably for over two years and has recently added support for ES Modules, becoming the first domestic CDN to embrace ES Module services.

ES Module, introduced in ES6, enables JavaScript to import modules using the import syntax and includes both static and dynamic import features. Current browser support is summarized in the table below:

Browser

Static import

Dynamic import

Chrome

61+

63+

Chrome For Android

67+

67+

Firefox

60+

Not supported

Firefox For Android

60+

Not supported

Safari

10.1+

11.1+

iOS Safari

10.3

11.2+

Edge

16+

Not supported

Note: Data sourced from CanIUse.

To enable ESM, 75CDN now treats files ending with .mjs , esm.js , and esm.browser.js as ES Modules. For eligible files, the "Copy // main.mjs import chimeePlayer from "//lib.baomitu.com/chimee-player/1.4.6/chimee-player.esm.js"; new chimeePlayer({ src: 'http://cdn.toxicjohann.com/lostStar.mp4', wrapper: '#wrapper', autoplay: true }); Additional details to note: Modules can use import.meta to obtain the current module's URL. Import paths support local relative/absolute paths and URLs. The same module imported multiple times executes only once. Resources must support CORS headers. 75CDN celebrates its two‑year anniversary and promises continued stability and new features beyond ES Module support. Reference materials include articles on native browser support for ES6 export/import, in‑depth ES6 module guides, and cartoon deep‑dives into ES modules.