immer#original TypeScript Examples

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Example #1
Source File: utils.ts    From firebase-tools-ui with Apache License 2.0 7 votes vote down vote up 
// Set parent[key] to newValue unless exising value is deeply equal.
// Can be used to set an immer draft property to a nested external object.
export function replaceIfChanged<Parent, Key extends keyof Parent>(
  parent: Parent,
  key: Key,
  newValue: Parent[Key]
): void {
  const oldValue = isDraft(parent) ? original(parent)![key] : parent[key];
  if (!deepEquals(oldValue, newValue)) {
    parent[key] = newValue;
  }
}