on() — vite Function Reference

Architecture documentation for the on() function in hmr.ts from the vite codebase.

Function typescript HMRClient HotRuntime

Entity Profile

HMRClient→ HotRuntime→ on() — vite Function Reference

Dependency Diagram

graph TD
  e9e2f4e6_b4f1_9171_926a_46f9ab95209e["on()"]
  d86a8333_3c9a_922b_57b2_926575326289["HMRContext"]
  e9e2f4e6_b4f1_9171_926a_46f9ab95209e -->|defined in| d86a8333_3c9a_922b_57b2_926575326289
  style e9e2f4e6_b4f1_9171_926a_46f9ab95209e fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/vite/src/shared/hmr.ts lines 117–128

  on<T extends string>(
    event: T,
    cb: (payload: InferCustomEventPayload<T>) => void,
  ): void {
    const addToMap = (map: Map<string, any[]>) => {
      const existing = map.get(event) || []
      existing.push(cb)
      map.set(event, existing)
    }
    addToMap(this.hmrClient.customListenersMap)
    addToMap(this.newListeners)
  }