Function make

Example

// Static message
const mapping = UndoMapping.make({
  operation: DeleteThread,
  inverse: RestoreThread,
  deriveContext: (input, output) => ({
    thread: output.thread,
    anchor: output.anchor,
  }),
  message: ['thread deleted label', { ns: '@dxos/plugin-thread' }],
});

// Dynamic message based on input/output
const mapping = UndoMapping.make({
  operation: RemoveObjects,
  inverse: RestoreObjects,
  deriveContext: (_input, output) => output,
  message: (input, _output) =>
    input.objects.length === 1
      ? ['object deleted label', { ns: getTypename(input.objects[0]) }]
      : ['objects deleted label', { ns: '@dxos/plugin-space' }],
});
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