Plumeria 13.1

refirst11Core team members

Plumeria 13.1.0 has been released! 🎉

This release draws inspiration from StyleX types and treats TypeScript's type system as a projection of the static compilation process, preserving explicit atomic class associations as types (including a minor HMR bug fix for the newly revamped createTheme).

1. Static Proof of Atoms: The _ident Property

Real-World Behavior: What You See on Hover

Instead of abstract type definitions, let’s look at a real-world component style definition featuring both nested media queries and theme variables (such as theme.textSecondary from our actual documentation component):

const styles = css.create({
  codeSection: {
    width: '100%',
    maxWidth: '600px',
    [breakpoints.md]: {
      justifyContent: 'center',
      maxWidth: '100%',
    },
  },

  featureDescription: {
    fontSize: 14,
    fontWeight: 400,
    lineHeight: 1.6,
    color: theme.textSecondary,
  },
});

Hovering over this styles object in your editor reveals a beautifully structured, deeply-resolved type contract:

const styles: Readonly<{
  readonly codeSection: Readonly<{
    readonly width: AtomicClassNameFor<"width", "100%">;
    readonly maxWidth: AtomicClassNameFor<"maxWidth", "600px">;
    readonly "@media (max-width: 768px)": Readonly<{
      readonly justifyContent: AtomicClassNameFor<"justifyContent", "center">;
      readonly maxWidth: AtomicClassNameFor<"maxWidth", '100%'>;
    }>;
  }>;
  readonly featureDescription: Readonly<{
    readonly fontSize: AtomicClassNameFor<"fontSize", 14>;
    readonly fontWeight: AtomicClassNameFor<"fontWeight", 400>;
    readonly lineHeight: AtomicClassNameFor<"lineHeight", 1.6>;
    readonly color: AtomicClassNameFor<"color", Readonly<{
      readonly default: "#6c6b67";
      readonly theme: "#9a989f";
    }>>;
  }>;
}>

This is the static, mathematical proof that your style is fully atomic, checked at build time, and mapped 1-to-1 with the compiled CSS. Every theme variable resolves to its nested default and theme-specific values, and every media query nests neatly with pure, immutable types.

2. The Power of Design Constraints

Because Plumeria is a pure zero-runtime CSS-in-JS library, it does not ship a JavaScript runtime to evaluate styles. Therefore, dynamic prop-drilling or "style props" (e.g., passing compiled style objects as component props to be dynamically merged or applied) is physically impossible to compile.

• We completely eliminate the temptation of prop-drilling styles at the TypeScript level.
• We enforce the ultimate zero-runtime design pattern: strict static composition.
• This structural constraint guarantees that your production bundle remains entirely free of runtime style-merging overhead, achieving raw native performance.

3. Perfecting Development Mode CSS HMR

In local development, the virtual CSS file (zero-virtual.css) now reacts instantly to HMR updates — no style drops, no flickering.

Turbopack

@plumeria/turbopack-loader now accurately removes stale theme variable rules on each hot update, and automatically purges any empty blocks left behind. The virtual CSS stays pristine across the entire development session.

Unplugin

For @plumeria/unplugin (Vite, Webpack, Farm), deleting all styles from a file now instantly clears the virtual cache. Deleted styles will never linger in the browser or memory, making HMR 100% accurate.

Plumeria 13.1.0 solidifies the bridge between compiler engineering and elegant type design. Experience the beautiful new static types, pristine DX, and rock-solid development environment today!

I would like to thank the StyleX implementer for providing this textbook up to this point.