HTML bundle loader#1732
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Closes #1528. Closes #926. Closes #1017. Closes #1016.
Fixes #848. Fixes #178.
This is based on some of the work listed in the above PRs. Thanks @pierredavidbelanger and @stevengill.
Enables both async and "sync" HTML imports into JS.
import('./some.html')import html from './some.html'orrequire('./some.html')The reason "sync" is in quotes there is because it currently actually isn't sync. It works like "sync" WASM imports:
some.htmlis still written out as a separate file, and the JS bundle preloads it before executing the bundle so that it appears synchronous to the code importing it but is actually async under the covers.This may not be the desired outcome in all cases - sometimes you might actually want HTML to be inlined into the JS so it is actually synchronous (unlike WASM). This could be a future improvement. For now, that is too hard to implement since we need to actually run the HTML packager inside the JS packager to get the final HTML contents (not currently possible). In Parcel 2 we will be looking at doing composable packagers, which would solve both this and other issues like inlining JS/CSS into HTML (#1456).