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before()

before<In, Out>(hook): Decorator<In, Out>

Creates a decorator that runs a hook before the function executes.

Type Parameters​

In: In​

The input type

Out: Out​

The output type

Parameters​

hook: (input) => void​

Function to run before, receives the input

Returns: Decorator<In, Out>​

A Decorator

Since​

2.4.0

Example​

const withLog = before<string, string>((name) => {
  console.log(`calling greet with: ${name}`);
});

const greet = withLog((name) => `Hello, ${name}!`);
greet("Alice"); // logs then returns "Hello, Alice!"