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once() — vue Function Reference

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

Function typescript TemplateCompiler CodeGen called by 2

Entity Profile

Dependency Diagram

graph TD
  f1f4b24d_509b_4634_bd6a_d3b0e91f0b48["once()"]
  b003e13b_30f4_2501_b631_df864fa7941b["enter()"]
  b003e13b_30f4_2501_b631_df864fa7941b -->|calls| f1f4b24d_509b_4634_bd6a_d3b0e91f0b48
  29af0f73_d62b_5291_e707_1f3301bf3357["leave()"]
  29af0f73_d62b_5291_e707_1f3301bf3357 -->|calls| f1f4b24d_509b_4634_bd6a_d3b0e91f0b48
  style f1f4b24d_509b_4634_bd6a_d3b0e91f0b48 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
}

Domain

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Source

Frequently Asked Questions

What does once() do?
once() is a function in the vue codebase.
What calls once()?
once() is called by 2 function(s): enter, leave.

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