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@buildtovalue/react

v1.2.0-next.1

Published

React layer for bpmn-react: native SVG canvas, shapes, gestures, palette, inspector, minimap and diff view. Zero runtime dependencies (react/react-dom as peers).

Vulnerabilities

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Links

Git

Maintainers

danzeroumdanzeroum

Keywords

bpmnreactsvgdiagrameditor

Readme

@buildtovalue/react

React layer for bpmn-react: a native-SVG BPMN designer with zero runtime dependencies (React as peer).

  • <BpmnEditor> — batteries-included editor (toolbar, palette, inspector, minimap, status badge)
  • <BpmnDesigner> / <BpmnViewer> — composable canvas with edit/read-only modes
  • viewBox pan/zoom (cursor-centered), pointer-capture drag with 4px threshold, port-based connecting with live rule feedback, lasso selection, corner resize, keyboard shortcuts
  • Granular external store (useSyncExternalStore) — gestures never re-render the whole tree
  • 12 built-in BPMN shapes, themable via --bpmnr-* CSS variables (light/dark)
  • Declarative plugin objects: node types, shapes, palette items, validation and governance rules
  • Observability without telemetry: plugins can register onEditorEvent and receive node.created / edge.connected / promotion.completed / import.warning / render.slow
  • DiffView, SVG/PNG exporters
import { BpmnEditor } from '@buildtovalue/react';
import '@buildtovalue/react/styles.css';

<BpmnEditor diagram={diagram} plugins={[myPlugin]} onChange={save} />;

Theming & typography

  • Theme: dark mode follows prefers-color-scheme by default. To control it explicitly, set data-bpmnr-theme="dark" (or "light") on the root element (<html>); the attribute overrides the system preference.
  • Font: the UI consumes --bpmnr-font (default system-ui stack). To opt into a brand font (e.g. Space Grotesk), load the webfont in your app and set :root { --bpmnr-font: 'Space Grotesk', system-ui, sans-serif; } — the library ships no font assets.
  • Semantic zoom: below 60% zoom the canvas drops secondary ink (edge labels, purpose chips and domain type tags); below 50% it also drops activity shadows.

Docs: https://github.com/danzeroum/bpmn/tree/main/docs — License: Apache-2.0.

Editor events (public catalog, Handoff 11 N-3)

The editor emits observability events through the plugin onEditorEvent callback — an injected handler, never a global emitter, zero deps. The complete catalog lives in EDITOR_EVENTS with typed payloads in EditorEventPayloads:

diagram.loaded · element.added · element.changed · element.removed · edge.connected · selection.changed · command.executed · command.undone · validation.changed · promotion.completed · import.warning (host-emitted after XML import) · render.slow · shape.render.error

Stability contract (semver):

  • adding an event = minor — hosts must tolerate unknown types;
  • changing a payload = MAJOR;
  • renaming an event: the old name keeps emitting alongside the new one for at least one minor with a single console deprecation warning (see DEPRECATED_EVENT_ALIASES — currently node.created → element.added), then disappears in the next major.

Composite palette items (PaletteItem.build, Handoff 17 ES-2)

A palette item may declare an optional composite factory:

build?: (ctx: PaletteBuildContext) => { command: Command; selectId: string };

ctx carries the current diagram, the node-type registry, the insertion position the host computed (viewport center, grid-snapped) and t for i18n defaults. When present, inserting the item executes the returned command — usually a compositeCommand, so ONE undo reverts the whole insertion — and selects selectId.

One factory, one source: the palette click and the ⌘K command palette entry both resolve items through paletteInsertCommand/insertPaletteItem (anti-drift tested). Items without build keep the plain single-node behaviour. The shipped example is «Event Subprocess» — buildEventSubprocessInsert creates the container (triggeredByEvent), a typed message start inside it and the referenced named definition in one atomic composite, so a fresh drop is lint-clean by construction.

Palette labels resolve palette.item.{id} from the i18n dictionary when the key exists, falling back to item.label — additive, existing items unchanged.