@ggsvelte/compose

Framework-free PortableSpec assembly: fold grammar layers, merge plot props, and produce the same spec the gg() builder emits. No DOM. Pre-1.0.

bun add @ggsvelte/compose     # or: npm install @ggsvelte/compose

Hosts (@ggsvelte/svelte, @ggsvelte/react) import this package so children and props assemble through one implementation.

Quick example

import { assemblePortableSpec } from "@ggsvelte/compose";

const spec = assemblePortableSpec({
  data: [
    { year: "1835", value: 12 },
    { year: "2026", value: 31 },
  ],
  aes: { x: "year", y: "value" },
  layers: [{ geom: "line" }],
});

Use @ggsvelte/spec to validate or lint the result, then render with @ggsvelte/core.