once() — vue Function Reference

Architecture documentation for the once() function in util.ts from the vue codebase.

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CompilerSFC→ TemplateTransformer→ once() — vue Function Reference

Dependency Diagram

graph TD
  cede765f_16a9_15d7_9fc7_65a6ff30f097["once()"]
  ce303fd5_0a15_37d7_872a_d1ca73ec7f6a["util.ts"]
  cede765f_16a9_15d7_9fc7_65a6ff30f097 -->|defined in| ce303fd5_0a15_37d7_872a_d1ca73ec7f6a
  style cede765f_16a9_15d7_9fc7_65a6ff30f097 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

src/shared/util.ts lines 361–369

export function once<T extends (...args: any[]) => any>(fn: T): T {
  let called = false
  return function () {
    if (!called) {
      called = true
      fn.apply(this, arguments as any)
    }
  } as any
}