east Function – $apply

const $apply: <T>(
  $apply: (t: T) => T,
  $revise?: (t: T) => Update<T>,
) => 
| { $apply: (t: T) => T, $revise: (t: T) => Update<T> }
| { $revise?: never, $apply: (t: T) => T }

Apply a function to a value.

import { $apply } from "@use-gpu/state";

const value = {
  hello: {text: 'world', bar: 2},
  foo: 1,
};

const update = {
  // Optional: provide a second callback to revise(...) custom updates
  hello: {text: $apply(text => text + ' !!!', text => $set(text)) },
};

expect(patch(value, update)).toEqual({
  hello: {text: 'world !!!', bar: 2},
  foo: 1,
});

Source

packages / state / src / patch.ts