isUninitialized • tldraw Docs

Call this inside a computed signal function to determine whether it is the first time the function is being called.

Mainly useful for incremental signal computation.

function isUninitialized(value: any): value is UNINITIALIZED

Example

const count = atom('count', 0)
const double = computed('double', (prevValue) => {
  if (isUninitialized(prevValue)) {
    print('First time!')
  }
  return count.get() * 2
})

Parameters

Name	Description
`value`	`any` The value to check.

Returns

value is UNINITIALIZED