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V5 WIP - do not merge#6657

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johnjenkins wants to merge 245 commits into
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v5
Draft

V5 WIP - do not merge#6657
johnjenkins wants to merge 245 commits into
mainfrom
v5

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@johnjenkins
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@johnjenkins johnjenkins commented Mar 29, 2026

Description

This is the main branch for the upcoming V5 release. Choc full of new things and some breaking changes

Things it'll address and close

Fixes #6641
Closes #6578
Fixes #6630
Fixes #5306
Closes #6599
Closes #5307
Closes #6107
Closes #4232
Closes #6638

Documentation

Does this introduce a breaking change?

  • Yes
  • No

Testing

Other information

johnjenkins and others added 30 commits May 10, 2026 21:53
* chore: rv `shadowDomShim`, `attachStyles` and `extras.experimentalScopedSlotChanges`

* chore: fixup rolldown error handling types

* chore: remove TODO 16 and 958

* chore: tackle TODO 1299. Serialize node attr audit

* chore: address / assess TODOs 728, 898, 1076, 461

* chore: address 1005, improving worker interface types

* chore: fix TODO 345. Reconciled MockWindow with Window

* chore: fix hmr TODO - clean up event listeners

* chore: fix TODO 419, type handling for resolved types vs template literals

* chore: close TODO 462, 463, 464. Implement `createTestCompiler` to mock / stub all compiler things. Compiler tests now re-added!

* chore: close TODO 914. Rename slot fixes and default to true

* chore: format

* chore: add non-shadow build-size test

* chore: close TODO 854. Remove `needsShadowDom` flag

* chore: close rest of TODOs!

* chore: speed up compiler tests

* chore:

* chore: fix ssr tests

* chore: fix cloneNode bug

* chore:

* chore:

* chore:

* chore:
* chore: more build size testing

* chore:

* chore:
)c

* chore: swap out custom node patching for jiti (config ts reading)

* chore: properly handle default esm exports
* chore: rv insertAdjacentText & insertAdjacentElement patches

* chore: optimize client-hydrate

* chore: fiddling
* chore: rv insertAdjacentText & insertAdjacentElement patches

* chore: optimize client-hydrate

* chore: fiddling

* chore: v5 enableImportInjection true by default

* chore:
…ets (#6714)

* chore: v5 move hash* settings to loader and www output settings

* chore: fix migrations to read from ancestor stencil.configs
…tml) (#6716)

* chore: v5 www output now handles all html files (not just src/index.html)

* chore: usa, usa :D

* chore:
…ions (#6720)

* feat: v5 retain build flags in external runtimes and imported collections

* chore:

* chore:
…vs (#6722)

* feat: v5 swap-out node stream for `ReadableStream` to work in edge envs

* chore:

* chore: update test

* chore:
* feat: v5 new ssr-wasm output
* feat: v5 inject stencil hydrate css into global-style

* chore: more testing
* feat: v5 add `externalRuntime` option to loader-bundle output

* chore: add tests

* chore:

* chore:

* chore:

* chore: fixup build tests

* chore:
* feat(runtime): v5 signals implementation

* chore:

* chore:

* chore:

* chore: e2e tests

* chore: all tests checked and passing
* chore: upgrade things

* chore: tidy up

* chore: make autoprefixer more current

* chore:
* feat(runtime): v5 support scoped custom element registries

* chore:
* chore(www): serviceWorker is now `null` by default

* chore:

* chore:

* chore:

* chore:
* chore: v5 - `extras` > `compat`

* chore:

* chore:

* chore:
…n a directory (#6741)

* feat(readme): v5 - multi component readmes

* chore: format

* chore:
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