Multiple import maps

[yoavweiss]

Request for Mozilla Position on an Emerging Web Specification

• Specification title: Dynamic import maps
• Specification or proposal URL (if available): Multiple import maps whatwg/html#10528
• Explainer URL (if available): Multiple import maps whatwg/html#10528 (comment)
• Proposal author(s) (@-mention GitHub accounts): @yoavweiss
• Caniuse.com URL (optional):
• Bugzilla URL (optional): https://bugzilla.mozilla.org/show_bug.cgi?id=1916277
• Mozillians who can provide input (optional): @smaug---- @zcorpan
• WebKit standards-position: Multiple Import Maps WebKit/standards-positions#381

Other information

Import maps currently have to load before any ES module and there can only be a single import map per document. That makes them fragile and potentially slow to use in real-life scenarios: Any module that loads before them breaks the entire app, and in apps with many modules the become a large blocking resource, as the entire map for all possible modules needs to load first.

This proposal is to enable multiple import maps per document, by merging them in a consistent and deterministic way.

[smaug----]

@jonco3 @codehag

[smaug----]

https://bugzilla.mozilla.org/show_bug.cgi?id=1916277

[zcorpan]

@allstarschh can you review this?

[allstarschh]

@allstarschh can you review this?

This allows multiple import maps can be specified by the dev, (originally only the first import-map would be accepted, others would be ignored), I'd say "positive" on this.