Summary

Upgrades the props package to solid-js@^2.0.0-beta.13 / @solidjs/web@^2.0.0-beta.13 and adds two new utilities: combineHandlers and partitionProps.

Breaking changes

Peer dependencies updated
solid-js@^2.0.0-beta.13 and @solidjs/web@^2.0.0-beta.13 are now required.

classList support removed
Solid 2.0 removes the classList JSX prop in favour of class accepting objects and arrays. combineProps no longer handles a classList key. Pass an object or array as class instead:

// Before
combineProps(props, { classList: { active: isActive() } })
// After
combineProps(props, { class: { active: isActive() } })

class combining semantics updated
When all combined class values are strings they are joined with a space (unchanged). When any value is a ClassList object or array the result is a flat array, which Solid 2.0's class prop accepts natively.

merge replaces mergeProps semantics
Non-special props now follow merge semantics: an explicit undefined in a later source overrides earlier values (previously undefined was skipped).

New utilities

combineHandlers
Chains multiple event handlers into one. Handlers that are null, undefined, or false are silently skipped — useful for conditional handlers inline. Returns the single handler unchanged when only one is present (no wrapping overhead). Reactive through Solid's props proxy when used in JSX; for a standalone signal source, read it explicitly before passing or wrap the call in createMemo.

<button onClick={combineHandlers(props.onClick, internalHandler)} />
<div onKeyDown={combineHandlers(props.onKeyDown, isOpen() ? closeOnEsc : null)} />

partitionProps
Splits a props object into [matched, rest] — both views are lazy reactive proxies powered by filterProps under the hood, so the predicate runs per property read and both halves stay in sync with dynamic props. For an expensive predicate, pass a createPropsPredicate result to share a single cache across both views.

const [ownProps, htmlProps] = partitionProps(props,
  key => ["label", "variant", "size"].includes(key as string)
);
return <button {...htmlProps}>{ownProps.label}</button>;

Internal changes

• mergeProps → merge, MergeProps → Merge throughout
• JSX type imported from @solidjs/web
• createMemo(fn, undefined, options) → createMemo(fn, options) (initialValue arg removed in 2.0)
• Tests: createComputed replaced with createEffect(compute, apply) + flush(); signals created outside createRoot to avoid SIGNAL_WRITE_IN_OWNED_SCOPE
• SSR test file added (test/server.test.ts)

Summary by CodeRabbit

• New Features

  • Added combineHandlers and partitionProps helper utilities.
  • Updated to support Solid.js v2.0 (beta.13).

• Breaking Changes

  • Removed classList JSX prop support; use class with objects/arrays instead.
  • Updated prop merging behavior to align with Solid 2.0 semantics where explicit undefined values override earlier values.