Common

Mocking

The mocking utils are used to replace real implementations to satisfy types or logics without change usage.

noop

This until does nothing, but it can be useful in some cases where you need a placeholder function.

class SomeClass {
  onMethod: Fn = noop
  method() {
    // ...
    this.onMethod()
  }
}

Sometimes its better, than handle empty values:

class SomeClass {
  onMethod: Fn | undefined
  method() {
    // ...
    if (this.onMethod)
      this.onMethod()
  }
}

through

This function returns the argument it received. It can be useful in some cases where you need a placeholder function that does nothing but return the value.

const order: FnWrapper = isDesc ? inverse : through
const sorter = order(compareNumbers)

SOME_DATA.sort(sorter)

Other

sleep

This function returns a promise that resolves after a specified number of milliseconds. It can be useful in some cases where you need to wait for something before continuing.

async function fetchData() {
  // ... do something
  await sleep(1000)
  // ... do something after waiting 1 second
}