evo-migrate-react

name	evo-migrate-react
description	Migrate a component from @ebay/ebayui-core-react to @evo-web/react. Receives the ebayui-core-react component name as the argument (e.g. /evo-migrate-react ebay-button).

Migrate ebayui-core-react → evo-react

You are migrating $ARGUMENTS from packages/ebayui-core-react/src/$ARGUMENTS/ to a new packages/evo-react/src/${ARGUMENTS#ebay-}/ directory.

Step 0 — Read before writing

1. Read every file in packages/ebayui-core-react/src/$ARGUMENTS/.
2. Read the Marko style.ts for the same component in either:
   • packages/evo-marko/src/tags/evo-${ARGUMENTS#ebay-}/style.ts, or
   • packages/ebayui-core/src/components/$ARGUMENTS/style.ts This gives you the correct skin module name to import (e.g. @ebay/skin/button → used as @ebay/skin/button.mjs).
3. Read the evo-marko component (packages/evo-marko/src/tags/evo-${ARGUMENTS#ebay-}/index.marko and its marko-tag.json or tag definition) to extract the full list of supported props and their types.
4. Read packages/evo-react/src/button/ as the canonical reference for all conventions.

---

Naming conventions

ebayui-core-react	evo-react
ebay-button (dir)	button (dir)
EbayButton (component)	EvoButton (component)
EbayButtonProps (type)	EvoButtonProps (type)

Story title mirrors the ebayui-core-react story title with ebay replaced by evo:

• "buttons/ebay-button" → "buttons/evo-button"
• "graphics & icons/ebay-avatar" → "graphics & icons/evo-avatar"

---

File structure

packages/evo-react/src/{name}/
  index.ts                  ← named re-exports only (no default exports)
  {name}.tsx                ← main component
  {subcomponent-name}.tsx   ← sub-components if present (named after actual sub-component, e.g. button-cell.tsx)
  types.ts                  ← all exported types
  context.ts                ← React context + hook (only if component uses context)
  README.md                 ← component name + Documentation section with Storybook link only
  {name}.stories.tsx        ← Storybook stories (co-located, NOT in __tests__/)
  test/
    test.browser.tsx        ← browser interaction tests (vitest-browser-react)
    test.server.tsx         ← SSR snapshot tests (renderToString)

Key difference from ebayui-core-react: tests live in test/ (not __tests__/), stories co-located with source (not inside __tests__/).

README.md format — keep it minimal, just a Storybook link (props and usage docs live in the story):

# EvoButton

## Documentation

[Storybook](https://opensource.ebay.com/evo-web/react/main/?path=/docs/buttons-evo-button--documentation)

---

Component authoring rules

No import React from "react" unless required for typing

@evo-web/react uses the automatic JSX transform — the JSX runtime is injected automatically and React does not need to be imported for JSX. Import only what you actually use as named imports:

// ✅ evo-react — import only what is needed
import type { ComponentProps, SyntheticEvent } from "react";
import classNames from "classnames";

// ❌ do NOT import the default React object unless unavoidable
import React from "react";

The only time import React from "react" is acceptable is when you need the namespace for a specific type like React.JSX.Element in overloaded signatures, and even then prefer import type { JSX } from "react" with JSX.Element.

---

Named function declarations — no FC, no arrow function components

// ✅ evo-react
export function EvoButton(props: NativeButtonProps) { ... }

// ❌ do NOT copy from ebayui-core-react
const EbayButton: FC<Props> = (props) => { ... }

For overloaded signatures, annotate overloads with React.JSX.Element but let the implementation infer:

export function EvoButton(props: AnchorButtonProps): React.JSX.Element;
export function EvoButton(props: NativeButtonProps): React.JSX.Element;
export function EvoButton(props: AnchorButtonProps | NativeButtonProps) { ... }

For non-overloaded components, omit the return type entirely and let TypeScript infer it.

No forwardRef — React 19 native ref

// ✅ evo-react: ref works natively as a normal prop
export function EvoButton({ ref, ...props }: NativeButtonProps) { ... }

// ❌ do NOT use
React.forwardRef(...)
withForwardRef(...)
forwardedRef prop

No default exports

// ✅
export function EvoButton(...) { ... }

// ❌
export default EvoButton;

Import Skin CSS directly in the component file, always with .mjs extension

import "@ebay/skin/button.mjs"; // ✅
import "@ebay/skin/button"; // ❌
import "@ebay/skin/button.css"; // ❌

Derive the module name from the style.ts file you read in Step 0 and append .mjs.

Use individual EvoIcon* components, not <EbayIcon name="..." />

// ✅ evo-react
import { EvoIconChevronDown16 } from "../icon/icons/chevron-down-16";
<EvoIconChevronDown16 />

// ❌ ebayui-core-react pattern — do not copy
<EbayIcon name="chevron-down-16" />

This applies to stories and tests as well — never use inline <svg> or custom placeholder icons. Always use an existing EvoIcon* component. Available icons are in packages/evo-react/src/evo-icon/icons/.

Optional callbacks — no required default () => {}

// ✅
onEscape?: (e: KeyboardEvent<HTMLButtonElement>) => void;
onEscape?.(event);

// ❌
onEscape = () => {}
onEscape(event);

Prop audit — align with evo-marko and eliminate unnecessary props

Before finalising the prop surface, compare the ebayui-core-react props against the evo-marko component you read in Step 0:

1. Props in evo-marko but missing from ebayui-core-react — add them to evo-react.
2. Props in ebayui-core-react but missing from evo-marko — investigate whether they are still needed:
   • Does CSS/Skin handle it now (so the prop is redundant)?
   • Was it a framework workaround that React 19 / evo-react no longer needs?
   • A real example: noSkinClasses on EbayIcon existed to opt out of skin class generation, but evo-react icon components always apply skin classes — the prop is unnecessary and should be dropped.
   • If you are uncertain whether a prop should be kept or removed, stop and ask before proceeding. Explain what the prop does and why you think it may be removable.
3. Mismatched types or semantics — if a prop exists in both but with different types or behaviour, stop and ask before deciding which to follow.

Do not silently carry over every prop from ebayui-core-react. Each prop must have a clear purpose in the evo-react context.

Accessibility prop naming — prefer a11yText over aria-label

evo-react standardises accessible label props as a11yText instead of raw aria-label for consistency across components. Before deciding the prop name:

1. Check how the evo-marko component names it (from the marko-tag.json / tag definition you read in Step 0).
2. If evo-marko uses a11yText, use a11yText in evo-react and map it to aria-label on the underlying element internally:

// ✅ evo-react
export function EvoButton({ a11yText, ...rest }: EvoButtonProps) {
  return <button aria-label={a11yText} {...rest} />;
}

// ❌ do not expose aria-label as a custom prop name when a11yText is the standard

3. If evo-marko uses a different name, or the pattern is unclear, stop and ask before proceeding.

Use use() instead of useContext()

Always consume React context with the use() hook from React 19, never useContext:

// ✅ evo-react
import { use } from "react";
const value = use(FooContext);

// ❌ do NOT use
import { useContext } from "react";
const value = useContext(FooContext);

Context provider pattern — always use a dedicated Provider component

Never pass an inline object literal to a context value prop. Instead, define a <XxxProvider> component in context.tsx that accepts each value as a named prop and memos the object internally:

// ✅ evo-react — context.tsx
export function FooProvider({ size, onToggle, children }: FooProviderProps) {
  const value = useMemo(() => ({ size, onToggle }), [size, onToggle]);
  return <FooContext value={value}>{children}</FooContext>;
}

// ✅ evo-react — foo.tsx
<FooProvider size={size} onToggle={onToggle}>

// ❌ do NOT inline the object
<FooContext value={{ size, onToggle }}>

This keeps memoization out of the component file and prevents unnecessary re-renders of all context consumers.

Never use React.Children APIs

Do not use Children.map, Children.toArray, findComponent, filterComponent, or any child-scanning pattern.

The preferred approach is named sub-components with React context (see ADR 0005). This is the established pattern in @evo-web/react and should be the default proposal for consistency.

If the ebayui-core-react component uses children composition (e.g. finding a sub-component in children), stop and ask before proceeding. Lead with the sub-component approach as the recommendation, but present the full picture so the user can confirm:

1. What sub-components would be needed, and what state (if any) the parent must share via context.
2. Whether a simpler alternative fits — e.g. a named prop (footer, header, title) if the region is a single, unstructured slot with no BEM class injection needed.
3. Any edge cases specific to this component that could affect the choice (e.g. enforced ordering, complex shared state, accessibility requirements).

Do not guess — get alignment before migrating this pattern.

---

Types

Keep all custom types in types.ts. Export them from index.ts. Do not inline complex types inside the component file.

// types.ts
export type Priority = "primary" | "secondary" | "tertiary" | "none";
export type EvoButtonProps = AnchorButtonProps | NativeButtonProps;

// index.ts
export { EvoButton } from "./button";
export type { EvoButtonProps, Priority } from "./types";

---

Test patterns

Browser tests — test/test.browser.tsx

Uses vitest-browser-react + userEvent. Tests real DOM interactions.

import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
import { render } from "vitest-browser-react";
import { userEvent } from "vitest/browser";
import { EvoButton } from "../button";

describe("evo-button", () => {
  let user: ReturnType<typeof userEvent.setup>;

  beforeEach(() => {
    user = userEvent.setup();
  });
  afterEach(() => {
    user.cleanup();
  });

  it("emits click event when clicked", async () => {
    const onClick = vi.fn();
    const screen = await render(
      <EvoButton onClick={onClick}>Click Me</EvoButton>,
    );
    await user.click(screen.getByRole("button"));
    expect(onClick).toHaveBeenCalledTimes(1);
  });
});

Key differences from ebayui-core-react tests:

• vitest-browser-react, not @testing-library/react
• await render(...) (async)
• userEvent from vitest/browser
• await expect.element(el).toBeInTheDocument() not expect(el).toBeInTheDocument()

Server tests — test/test.server.tsx

Uses renderToString for SSR snapshots.

import { it, expect, describe } from "vitest";
import { renderToString } from "react-dom/server";
import { EvoButton } from "../button";
import type { Priority } from "../types";

describe("EvoButton SSR", () => {
  it.each<Priority>(["primary", "secondary", "tertiary", "none"])(
    "should render button with priority=%s",
    (priority) => {
      expect(
        renderToString(<EvoButton priority={priority}>Button</EvoButton>),
      ).toMatchSnapshot();
    },
  );
});

---

Storybook stories — {name}.stories.tsx

• One story per component unless the component tree itself must change between variations (e.g. different sub-components, optional children). Visual and prop variations (size, alignment, disabled, open…) must be handled through args and argTypes controls — not separate stories.
• title must mirror the ebayui-core-react story title with ebay replaced by evo.
• Description format: one-sentence summary followed by a ## Usage section with the import snippet.
• subcomponents: If the component has sub-components (e.g. EvoAvatarImage alongside EvoAvatar), declare them in the meta using the subcomponents field. This causes Storybook's autodocs to render a props table for each sub-component as a separate tab.

import type { Meta, StoryObj } from "@storybook/react-vite";
import { EvoButton } from "./button";

const meta: Meta<typeof EvoButton> = {
  title: "buttons/evo-button",
  component: EvoButton,
  // Include any exported sub-components so autodocs generates their prop tables:
  // subcomponents: { EvoButtonCell },
  tags: ["autodocs"],
  parameters: {
    docs: {
      description: {
        component: `
A flexible button component that renders as \`<button>\` or \`<a>\` based on the \`href\` prop.

## Usage

\`\`\`tsx
import { EvoButton } from "@evo-web/react/button";
\`\`\`
        `,
      },
    },
  },
  argTypes: {
    // one entry per custom prop with control type + description
  },
  args: {
    // sensible defaults
  },
};

export default meta;
type Story = StoryObj<typeof EvoButton>;

export const Default: Story = {
  args: { children: "Button" },
};

---

Update the app migration skill

After completing the component, update .claude/skills/evo-app-migrate-react/:

1. Create or update .claude/skills/evo-app-migrate-react/components/evo-{name}.md where {name} is the evo-react component directory name (for example, evo-accordion.md).
2. In that component file, document every prop that changed compared to ebayui-core-react:
   • Removed props (with reason, e.g. "handled by CSS now")
   • Renamed props (old → new)
   • Type changes
   • Behavior differences
   • New composition requirements, if the React API changed to named sub-components
3. If nothing changed beyond the global renames, write: No prop changes. Global renames from Step 2 are sufficient.
4. Update .claude/skills/evo-app-migrate-react/SKILL.md only as an index:
   • Add a row for ebay-{name} under Step 3 — Apply per-component prop changes.
   • Link that row to components/evo-{name}.md.
   • Do not inline per-component migration details in SKILL.md.

Keep component entries concise. App owners read these files, not component authors.

---

Checklist before finishing

• All files use named exports (no export default)
• No React.forwardRef or withForwardRef
• No FC<Props> type annotation on components
• Return type omitted on non-overloaded components (inferred by TS)
• Skin CSS imported with .mjs extension
• Individual EvoIcon* components used (no <EbayIcon name="..." />)
• Optional callbacks use ?. (no = () => {} defaults)
• Props cross-checked against evo-marko — missing props added, unnecessary props removed or queried
• aria-label prop replaced with a11yText if evo-marko uses it (mapped internally to aria-label); asked if naming is unclear
• No React.Children, findComponent, or child-scanning — asked if encountered
• test/test.browser.tsx uses vitest-browser-react
• test/test.server.tsx uses renderToString + snapshots
• README.md created with component name and Storybook documentation link only
• Stories in {name}.stories.tsx co-located with source
• Story title follows "category/evo-{name}" pattern
• App migration skill has a linked components/evo-{name}.md file and no inline component details in SKILL.md
• npm run build -w packages/evo-react passes
• Changeset added in .changeset/ with patch bump for @evo-web/react (@evo-web/react is still experimental, so all additions use patch)