Function testIncrementalUpdatesPerformanceOnLargeFragmentedDocument

tests/y-text.tests.js:1735–1766

 * @param {t.TestCase} _tc
 */
export const testIncrementalUpdatesPerformanceOnLargeFragmentedDocument = _tc => {
  const itemsToInsert = largeDocumentSize
  const updates = /** @type {Array<Uint8Array<ArrayBuffer>>} */ ([])
  ;(() => {
    const doc1 = new Y.Doc()
    doc1.on('update', update => {
      updates.push(update)
    })
    const text0 = doc1.get('txt')
    tryGc()
    t.measureTime(`time to insert ${itemsToInsert} items`, () => {
      doc1.transact(() => {
        for (let i = 0; i < itemsToInsert; i++) {
          text0.insert(0, '0')
        }
      })
    })
    tryGc()
  })()
  ;(() => {
    t.measureTime(`time to merge ${itemsToInsert} updates (differential updates)`, () => {
      Y.mergeUpdates(updates)
    })
    tryGc()
    t.measureTime(`time to merge ${itemsToInsert} updates (ydoc updates)`, () => {
      const ydoc = new Y.Doc()
      updates.forEach(update => {
        Y.applyUpdate(ydoc, update)
      })
    })
  })()
}

/**
 * Splitting surrogates can lead to invalid encoded documents.