[FrameworkBundle] remove support for preloading ESM using headers #50476
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weaverryan
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May 30, 2023
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Thank you @dunglas. |
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nicolas-grekas
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…headers (dunglas) This PR was merged into the 6.3 branch. Discussion ---------- [FrameworkBundle] remove support for preloading ESM using headers | Q | A | ------------- | --- | Branch? | 6.3 | Bug fix? | yes | New feature? | no <!-- please update src/**/CHANGELOG.md files --> | Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files --> | Tickets | n/a | License | MIT | Doc PR | n/a Sorry to be that late on this one. It looks like preloading ESM using HTTP headers (and so using 103 Early Hints) doesn't work, at least for now: WICG/import-maps#273 (comment) ImportMap must be defined before downloading any ESM, and by definition HTTP headers are sent before importmap definition (it's currently not possible to define importmap using headers). I don't know why I didn't caught this during my previous testing session, but now I get this error in the console when using this feature (which, according to the previously mentioned issue, is expected): ``` An import map is added after module script load was triggered. Uncaught TypeError: Failed to resolve module specifier "app". Relative references must start with either "/", "./", or "../". ``` This patch simply removes this feature, which is entirely non-functional and misleading for the end user. Commits ------- 7776c28 [FrameworkBundle] remove support for preloading ESM modules using headers
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Sorry to be that late on this one.
It looks like preloading ESM using HTTP headers (and so using 103 Early Hints) doesn't work, at least for now: WICG/import-maps#273 (comment)
ImportMap must be defined before downloading any ESM, and by definition HTTP headers are sent before importmap definition (it's currently not possible to define importmap using headers).
I don't know why I didn't caught this during my previous testing session, but now I get this error in the console when using this feature (which, according to the previously mentioned issue, is expected):
This patch simply removes this feature, which is entirely non-functional and misleading for the end user.