EffectWeb 0.8.0

EffectWeb 0.8.0 shrinks the API to what applications use, compiles every JSX file, adds four authoring APIs that replace patterns consumers had been writing by hand, and speeds up the renderer.

Breaking changes and migration

• Every file containing JSX is compiled and linted unless a @jsxImportSource pragma names another runtime. A view file that imported only sibling components used to be skipped and then fail inside the bundler. The allJsx compiler and lint option is removed.
• className is removed; write class. renderList is removed; import list.
• defineTasks(owner, definitions) is now ownedTasks(owner, definitions); defineTasks keeps only the component builder form.
• program, modelOwner and defineTasks no longer accept name; it only fed the removed tracing.
• Removed from effectweb/advanced: mapTransition, mapCommand, defineField and the field types, observeBindings, inspectBindings, mountBindingInspector, observePrograms, fromStream, fromAtom, fromSubscriptionRef, makeDomMount, makeDomBinding, makeEffectHandler. Pass a uiRuntime(context) to domMount, domBinding and effectEvent for services; observe streams and atoms from a controller that publishes into a modelOwner.
• The lint preset reports every rule as an error and adds effectweb/no-hook-names.

Additions

• list(rows, identity, render) keys rows with an inline identity; collection(identity) is for rows that are also shared with share.
• controllerView({ create, view, identity }) creates a controller from a view's props and disposes it with the view.
• domHandle() gives a controller an element reference through use={handle.mount} and handle.element().
• ownedTasks(owner, { save: { run, policy } }) binds named actions to an owner's slots.
• commandSlots releases keys nobody references any more, so long-lived applications do not accumulate one slot per entity.
• Lint: EW3004 covers collection and commandSlots created inside a view; EW3005 flags sequence rows with editable controls or filtered components; EW3006 flags index-derived identity; EW3007 (no-hook-names) flags useX names. EW3003 also catches a slot held in a local and run once.

Renderer

Single-element content keeps no comment markers, event handlers no longer allocate a scope each, attribute reconciliation is a single pass, and teardown under a removed ancestor skips per-node work. On the 1000-row benchmark, mount went from 35.3 to 30.6 ms and removing all rows from 16.8 to 9.9 ms.

Tooling

npm run build:js writes each package to dist.next and renames it into place, so linked consumers never see a half-written dist. Evaluate-only renderer specs run under happy-dom in tests/unit; only browser-dependent behavior stays in Playwright. AUTHORING.md documents the new APIs, the make* naming convention, domMount timing and the no-hooks rule, and every snippet compiles in authoring-guide.typecheck.tsx.

All 15 npm packages share version 0.8.0. The Effect peer remains effect@4.0.0-rc.112. Native compiler packages support glibc Linux x64/arm64, macOS x64/arm64, and Windows x64.

Packaging

The release workflow verified all platforms and published all 15 packages with npm provenance.