refactor: add color role table and buildScheme#4916
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The mobile version of example app from this branch is ready! You can see it here. |
This was referenced May 5, 2026
satya164
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Adds src/theme/tokens/sys/color/roles.ts with a roleToTone table keyed by (mode, contrast) and a buildScheme() function. LightTheme and DarkTheme replace their hand-duplicated color literals with a single buildScheme() call each. Output shape is identical; tone values match the existing hand-written spec.
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Hey @adrcotfas, thank you for your pull request 🤗. The documentation from this branch can be viewed here. |
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Motivation
LightThemeandDarkThemeeach contained ~70 lines of hand-duplicated palette look-ups. Because the mapping between color roles (e.g.primary) and palette tones (e.g.primary40) isdefined by the Material Design 3 spec, keeping it as inlined object literals meant every future scheme (high-contrast, dynamic) would require copy-pasting the same structure again with no single source of truth to audit against the spec.
This extracts that spec knowledge into a
roleToTonetable insrc/theme/tokens/sys/color/roles.ts, keyed by(mode, contrast). AbuildScheme()function walks the table, resolves palettevalues, and derives the computed fields (
stateLayerPressed,elevation).LightThemeandDarkThemenow each callbuildScheme()with a single argument instead of listing ~60 literals.No behavior changes: the output shape is identical and every tone value matches the previous hand-written spec.
Related issue
See https://www.notion.so/callstack/React-Native-Paper-Foundation-for-MD3-Expressive-34c5d027c0f880edba3df107cd35946f?source=copy_link
Merge order:
refactor: remove MD3 prefix and use deprecated aliases #4910
refactor: move styles/ into src/theme/ tree #4915
refactor: add color role table and buildScheme #4916
feat: add theme.state opacity tokens and split theme types #4917
feat: add theme.shapes and cornersToStyle #4919
feat: add emphasized typescale and fix letter-spacing spec bugs #4920
feat: add motion tokens (spring, easing, duration) #4922
feat: add elevation tokens and fix Android dp spec bug #4923
refactor(PaperProvider): add reduceMotion prop and useReduceMotion hook #4924
feat: add dynamicColor prop and DynamicTheme refactor #4925
feat(v6): remove deprecated public API #4926
docs: update documentation #4927
Test plan
yarn typescript-- no new type errorsyarn test-- all existing snapshot and unit tests pass; color values are unchanged