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Repositories / Excalidraw

Excalidraw

Focused tour of drawing, rendering, history, and collaboration paths; not a whole-project map.

Snapshot readyCurated exploration

Upstream: excalidraw/excalidraw
Default branch: master
Revision: 5cf547650b70
Analysis date: 2026-07-20
Fixture version: v1.0.2
Coverage: Focused tour—not full-project coverage. Covers five selected flows through canvas input, element construction, rendering, history, and collaboration.

Overview Graph Flows Files Ask

Excalidraw
Files
packages/excalidraw/history.ts

Repository file

packages/excalidraw/history.ts

History stacks and delta application for undoing or redoing visible editor changes.

Language: typescript
Lines: 249
Category: source
Size: 6,836 B

Source excerpt

Stored evidence from this immutable analysis snapshot

L139–146

139  public undo(elements: SceneElementsMap, appState: AppState) {140    return this.perform(141      elements,142      appState,143      () => History.pop(this.undoStack),144      (entry: HistoryDelta) => History.push(this.redoStack, entry),145    );146  }

Symbols

Symbols in this file

History.undoL139–146
History.performL157–229

Architecture nodes

Related architecture nodes

History service
Pops inverse deltas, applies them to the current state, and maintains undo and redo stacks.
History

Feature-flow evidence

Referenced by 1 mapped step

Apply the inverse history deltaL139–145

Evidence provenance

Snapshot: github:excalidraw/excalidraw@5cf547650b700b35507e83773695098150b810d2:schema-2:fixture-1.0.2
Fixture: v1.0.2
Installer: fixture-installer-v1
Completed: Jul 20, 2026