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grommet-component-contribution

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Build and contribute Grommet React components following official team conventions. Use when creating a new component from scratch, refactoring a component to align with Grommet conventions, preparing a PR for Grommet core contribution, or reviewing a component against acceptance criteria. Covers scaffolding, forwardRef, displayName, useThemeValue, FormContext, propTypes, TypeScript declarations, accessibility, i18n, and testing.

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Grommet Component Contribution Skill

Use When

  • Building a new Grommet component from scratch
  • Refactoring a component to align with Grommet conventions
  • Preparing a PR for Grommet core contribution
  • Reviewing a component against the Grommet acceptance criteria

Workflow

  1. Discover: read the closest existing component, its tests, propTypes, types, and stories.
  2. Plan: define the value contract, commit model, minimum props, and composition boundaries.
  3. Scaffold: create the component files, register exports, and add docs/tests/stories.
  4. Implement: build pure utilities first, then the component with forwardRef, useForwardedRef, useThemeValue, and FormContext integration.
  5. Test: start with accessibility, then value emission, form integration, keyboard, and edge cases.
  6. Stories: controlled usage, FormField integration, and CustomThemed only if new theme tokens exist.
  7. Validate: lint, full tests, and top-level grommet export coverage.

Non-Negotiable Principles

  • Compose small primitives before building a monolith.
  • Prefer native browser APIs such as Intl over custom format/parse logic.
  • Put customization in theme tokens, not instance props.
  • Keep accessibility, semantic HTML, and keyboard support mandatory.
  • Use onChange with the { value } shape for structured inputs.
    • Native element wrappers (TextInput, CheckBox) emit the standard React synthetic event via onChange(event).
    • Structured inputs that own a parsed/formatted value (DateInput) emit onChange({ value }).
  • Simple inputs emit on every meaningful interaction; structured inputs emit only when the composed value is valid.
  • Spread ...rest onto the root DOM element, though some components may be selective about placement.

Default API Shape

  • Start with only truly universal props: aria-label, id, and ...rest.
  • Apply disabled only to value-input components (TextInput, CheckBox, Select, DateInput, etc.).
  • Do NOT add disabled to non-interactive display components (Text, Heading, Anchor).
  • Use genericProps for layout and style passthrough.
  • See REFERENCE.md for component-specific API shapes.

Implementation Checklist

  • React.forwardRef plus displayName
  • useForwardedRef(refArg) instead of raw refs
  • const { theme, passThemeFlag } = useThemeValue()
  • FormContext integration via useFormInput when the component participates in forms
  • TypeScript declarations in index.d.ts
  • propTypes.js guarded for production
  • Component barrel export and top-level export registration
  • Theme defaults live under a dedicated theme.<componentName> namespace
  • Stories in CSF-3 format
  • Tests use @testing-library/user-event, jest-axe, and <Grommet> wrappers

When Unsure

  1. Check the nearest similar component.
  2. Check existing theme tokens.
  3. Check shared utilities or FormContext.
  4. Ask before inventing a new pattern.
  5. Read REFERENCE.md before making implementation decisions.
  6. Review EXAMPLES.md for a matching archetype before drafting new APIs.

Detailed Reference

  • REFERENCE.md — anti-hallucination rules, implementation patterns, PR checklist, decision tree, and anti-patterns
  • EXAMPLES.md — archetype code examples for all 4 component types (Simple Input, Drop/Modal, Display Only, Layout)
  • references/architecture.md — forwardRef, useForwardedRef, useThemeValue, FormContext/useFormInput, directory structure, propTypes, TypeScript declarations
  • references/styling.md — styled-components, styledComponentsConfig, theme token namespace, disabledStyle/readOnlyStyle, t-shirt sizing
  • references/accessibility.md — Keyboard component, focus restore, aria-label, Escape handling, semantic HTML rules
  • references/forms.md — FormContext.useFormInput(), FormField error surfacing, non-destructive UX
  • references/i18n.md — MessageContext string keys, AnnounceContext live regions, polite vs assertive