function change()

in frontend/index.js [224:254]

• 29 lines of code
• 10 McCabe index (conditional complexity)

function change(doc, options, callback) {
  if (doc[OBJECT_ID] !== '_root') {
    throw new TypeError('The first argument to Automerge.change must be the document root')
  }
  if (doc[CHANGE]) {
    throw new TypeError('Calls to Automerge.change cannot be nested')
  }
  if (typeof options === 'function' && callback === undefined) {
    [options, callback] = [callback, options]
  }
  if (typeof options === 'string') {
    options = {message: options}
  }
  if (options !== undefined && !isObject(options)) {
    throw new TypeError('Unsupported type of options')
  }

  const actorId = getActorId(doc)
  if (!actorId) {
    throw new Error('Actor ID must be initialized with setActorId() before making a change')
  }
  const context = new Context(doc, actorId)
  callback(rootObjectProxy(context))

  if (Object.keys(context.updated).length === 0) {
    // If the callback didn't change anything, return the original document object unchanged
    return [doc, null]
  } else {
    return makeChange(doc, context, options)
  }
}