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Codex/plan migration from styled components to stylex g54kic#5

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Codex/plan migration from styled components to stylex g54kic#5
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@skovhus skovhus commented Dec 30, 2025

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@skovhus skovhus force-pushed the codex/plan-migration-from-styled-components-to-stylex-g54kic branch from 2a88d30 to c1146fe Compare January 1, 2026 19:47
@skovhus skovhus closed this Jan 2, 2026
@skovhus skovhus deleted the codex/plan-migration-from-styled-components-to-stylex-g54kic branch January 2, 2026 18:02
cursor Bot pushed a commit that referenced this pull request Feb 27, 2026
Finding #1 (MODERATE): canSafelyInline and resolvePerSiteProps missed
JSXSelfClosingElement nodes (<Foo />) — consumed props on self-closing
elements were not checked for safety or variant creation. Fixed by
extracting findAllJsxSites() helper that searches both JSXElement and
JSXSelfClosingElement, used by all JSX scanning functions.

Finding #2 (MODERATE): attrsAsTag (.attrs({ as: SomeComponent })) was
not checked — component-ref overrides were silently ignored. Fixed by
bailing extractStaticPropsFromAttrs when attrsAsTag is set.

Finding #3 (MODERATE): $-prefixed non-consumed transient props would
leak to the DOM in the wrapper path for inlined intrinsic elements.
Fixed by setting shouldForwardProp.dropPrefix to "$" in applyResolution.

Finding #4 (LOW): findVaryingProps had an always-true condition
(!allSame || hasAnyValue where hasAnyValue was guaranteed true).
Simplified: track all consumed props present at any JSX site.

Finding #5 (LOW): Covered by Finding #3's dropPrefix fix.

Finding #6 (LOW): Inaccurate comment in applyResolution. Updated.

Finding #7 (LOW): Static property inheritance lost for resolved
components. Fixed by saving originalBaseIdent before overwriting base.

Added 3 regression tests:
- attrsAsTag component ref bail
- self-closing element with dynamic consumed prop (canSafelyInline)
- self-closing element with static consumed prop (variant creation)

Co-authored-by: Kenneth Skovhus <skovhus@users.noreply.github.com>
@skovhus skovhus mentioned this pull request Feb 27, 2026
skovhus added a commit that referenced this pull request Feb 28, 2026
…nt, helper sizing, prop forwarding

Bug #5: Handle pseudoElementWithPseudo selectors (e.g. ::-webkit-slider-thumb:hover)
in css-helper.ts selector dispatch. Fix process-rules.ts to distinguish AST nodes from
pseudo maps using "default" key check instead of typeof object.

Bug #4: In css-helper-conditional.ts, skip unsupported selectors (child/descendant)
with continue instead of bailing with return null. Add retry logic in
tryResolveDynamicPropertyNameTpl to try different ternary splits when the first
attempt fails due to unresolvable expressions.

Bug #2: In rule-interpolated-declaration.ts, trace local variables back to function
parameters in helper calls (e.g. sizeMap[size] -> size). Generate style functions
with derived expressions as call arguments and inferred number types. Fix property
shorthand when key and value identifiers match.

Bug #7: In emit-component.ts, skip forwarding props that are only used in style
functions and not in .attrs() defaults.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
skovhus added a commit that referenced this pull request Mar 1, 2026
* Fix 4 orbiter codemod bugs: pseudo-element hover, conditional alignment, helper sizing, prop forwarding

Bug #5: Handle pseudoElementWithPseudo selectors (e.g. ::-webkit-slider-thumb:hover)
in css-helper.ts selector dispatch. Fix process-rules.ts to distinguish AST nodes from
pseudo maps using "default" key check instead of typeof object.

Bug #4: In css-helper-conditional.ts, skip unsupported selectors (child/descendant)
with continue instead of bailing with return null. Add retry logic in
tryResolveDynamicPropertyNameTpl to try different ternary splits when the first
attempt fails due to unresolvable expressions.

Bug #2: In rule-interpolated-declaration.ts, trace local variables back to function
parameters in helper calls (e.g. sizeMap[size] -> size). Generate style functions
with derived expressions as call arguments and inferred number types. Fix property
shorthand when key and value identifiers match.

Bug #7: In emit-component.ts, skip forwarding props that are only used in style
functions and not in .attrs() defaults.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix theme value resolution in pseudo-element + pseudo-class combinations

When a theme value interpolation (e.g., color("controlPrimaryHover")) appears
inside a combined pseudo-element + pseudo-class selector like
::-webkit-slider-thumb:hover, delegate to applyResolvedPropValue instead of
writing directly to perPropPseudo. This ensures the value is correctly scoped
within the pseudo-element's nested selector bucket, producing the merged
{ default: ..., ":hover": ... } format inside "::-webkit-slider-thumb".

Previously, the hover backgroundColor was dropped because
tryHandleThemeValueInPseudo wrote to the top-level perPropPseudo map,
ignoring the pseudoElement context entirely.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Bail on local helper calls with untraceable template expressions

When tryHandleLocalHelperCall analyzes a helper function's return template
literal, verify that every CSS property's expression can be traced back to
the function parameter (either directly, via unit suffix, or through a local
variable derived from the param). If any expression can't be traced, bail
instead of silently generating incorrect code that passes the raw prop value
as a CSS value.

This fixes AvatarContainer where avatarSizeToCSS uses imperative mutation
(let width = pixelSize; if (...) { width = ... }) which the single-level
variable tracing couldn't follow, causing it to emit width: size (AvatarSize
string) instead of a computed pixel number.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Address review comments: prop forwarding and helper-local scope

- Forward style-function-only props to wrapped custom components
  (styled(Component) should forward all non-transient props like
  styled-components does). Only intrinsic element wrappers should
  filter style-only props.
- Bail on derived call args that reference helper-local variables
  not in scope at the call site (e.g., const scale = 2; const px =
  sizeMap[size] * scale would produce invalid code referencing scale).
- Refactor: extract resolveDerivedLocalVariable helper, replace
  inline containsParam with collectIdentifiers utility, eliminate
  non-null assertion.
- Fix CI: add missing token names to tokens.stylex.ts, format plan.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Remove completed plan file

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix rendering CI: add conditional-alignChildSizing to expected failures

The test case now includes a child selector (& > div) that StyleX cannot
express, causing an expected visual mismatch. Also remove two keyframes
entries that now pass.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Restore bail on unsupported selectors and fix direct param tracing

- Revert `continue` to `return null` for non-`&` selectors in
  template-literals.ts and css-helper-conditional.ts — the `continue`
  approach silently dropped unsupported selector styling (lossy)
- Revert conditional-alignChildSizing test case to remove the `& > div`
  child selector that triggered the lossy behavior
- Restore EXPECTED_FAILURES in verify-storybook-rendering.mts to match
  main (conditional-alignChildSizing should not be expected to fail)
- Fix direct param interpolation tracing: track CSS properties that
  directly reference the function parameter (with or without unit) so
  `opacity: ${value}` doesn't falsely bail
- Add unit test for direct param usage without unit suffix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix 3 codemod issues discovered during orbiter migration

1. no-shadow lint errors: cssPropertyToIdentifier now accepts avoidNames
   set built from importMap keys. When a generated style function parameter
   name (e.g., zIndex) conflicts with a top-level import, it is suffixed
   with "Value" (e.g., zIndexValue) to prevent shadowing.

2. Variant condition props forwarded to wrapped component: Track props
   added purely by variant conditions and pseudo-alias selectors in a
   styleOnlyConditionProps set. These are no longer forwarded to the base
   component unless it explicitly accepts them.

3. Event handler type annotations: Add post-processing pass that annotates
   unannotated event handler arrow function parameters at JSX usage sites
   of converted components with the appropriate React event type
   (e.g., onChange handler gets React.ChangeEvent annotation).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix intrinsic event handler annotations for converted components

* Fix style function and inline style props forwarded to base component

Props used only in CSS interpolations (styleFn) and inline style expressions
were being forwarded as JSX attributes to the wrapped component, causing
TypeScript errors like 'Property "position" does not exist on FlexProps'.
Mark these props as style-only so they are not forwarded unless the base
component explicitly accepts them. Also moves .attrs() static attrs after
{...rest} spread to match styled-components override semantics.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix ref forwarding, warning messages, and PropsWithChildren in narrow types

- Only include `ref` in narrow intrinsic types when the component actually
  forwards it (via `{...rest}` or explicit ref usage), preventing
  "ref declared but not forwarded" lint errors
- Replace `React.PropsWithChildren<{...}>` with inline
  `{ ...; children?: React.ReactNode }` for cleaner, more explicit types
- Remove interpolated function/prop names from bail warning messages so
  warnings can be grouped centrally
- Bail on local helper functions that return untraceable CSS instead of
  silently dropping styles

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix WarningType union to match de-interpolated warning strings

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Address PR review feedback: prop forwarding, derived types, event annotations

- Forward style-only condition props when base component type is unresolvable,
  matching styled-components semantics (all non-transient props are forwarded)
- Use number | string for derived helper value style function params instead of
  hardcoded number, supporting both numeric and token-based lookup tables
- Limit event handler type annotations to intrinsic-based components only,
  avoiding incorrect React.*Event annotations on custom component callbacks

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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