• Will not work as file:// because browser throws an error. Works http:// and https://
• Will work with window., but this is bad practice when the file is anticipated to be a module.
• Namespace imports are ignored (i.e., import * as UMD from './umd.js', UMD is ignored.
  • We believe this is because it is directly exported by the module to globals, so there is no export to import by the importing module.
• Modules must use the export that's in the UMD section.
  • From the exporting file: factory(global.ExampleUMD = {}) but be referred to as ExampleUMD

• Will work when being server over file://, http:// and https://.
• Must use window.ExampleUMD and cannot use the export directly, i.e.ExampleUMD.
• Cannot use import in any Javascript.
• In the UMD export, the global. becomes window. for the browser.
  • This is why the UMD library doesn't ever refer to window.

• UMD declaration must be at the end of the file. This is unlike the unencapsulated version which allows the declaration and exports at the beginning of the file.

Useful examples and documentation on UMD:

Blogs: https://jameshfisher.com/2020/10/04/what-are-umd-modules/ https://jakearchibald.com/2017/es-modules-in-browsers/ https://salomvary.com/es6-modules-in-browsers.html

Issues: systemjs/systemjs#2064 systemjs/systemjs#1933

paroi-tech/direct-vuex#14

Repos: https://github.com/umdjs/umd/

Other: https://stackoverflow.com/a/63751410/15147681 https://github.com/paulmillr/noble-secp256k1/releases/tag/1.6.3 evanw/esbuild#507 (comment)