Multiple Import Maps

[yoavweiss]

WebKittens

@annevk

Title of the spec

Dynamic import maps

URL to the spec

https://github.com/whatwg/html/pull/10528

URL to the spec's repository

https://github.com/whatwg/html

Issue Tracker URL

No response

Explainer URL

https://github.com/whatwg/html/pull/10528#issue-2437162429

TAG Design Review URL

https://github.com/w3ctag/design-reviews/issues/980

Mozilla standards-positions issue URL

https://github.com/mozilla/standards-positions/issues/1058

WebKit Bugzilla URL

https://bugs.webkit.org/show_bug.cgi?id=279025

Radar URL

rdar://135555516

Description

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.