Method update

src/Map.js:196–247

(ownerID, shift, keyHash, key, value, didChangeSize, didAlter)

  }

  update(ownerID, shift, keyHash, key, value, didChangeSize, didAlter) {
    const removed = value === NOT_SET;

    const entries = this.entries;
    let idx = 0;
    const len = entries.length;
    for (; idx < len; idx++) {
      if (is(key, entries[idx][0])) {
        break;
      }
    }
    const exists = idx < len;

    if (exists ? entries[idx][1] === value : removed) {
      return this;
    }

    SetRef(didAlter);
    // eslint-disable-next-line @typescript-eslint/no-unused-expressions -- TODO enable eslint here
    (removed || !exists) && SetRef(didChangeSize);

    if (removed && entries.length === 1) {
      return; // undefined
    }

    if (!exists && !removed && entries.length >= MAX_ARRAY_MAP_SIZE) {
      return createNodes(ownerID, entries, key, value);
    }

    const isEditable = ownerID && ownerID === this.ownerID;
    const newEntries = isEditable ? entries : arrCopy(entries);

    if (exists) {
      if (removed) {
        // eslint-disable-next-line @typescript-eslint/no-unused-expressions -- TODO enable eslint here
        idx === len - 1
          ? newEntries.pop()
          : (newEntries[idx] = newEntries.pop());
      } else {
        newEntries[idx] = [key, value];
      }
    } else {
      newEntries.push([key, value]);
    }

    if (isEditable) {
      this.entries = newEntries;
      return this;
    }

    return new ArrayMapNode(ownerID, newEntries);
  }
}

class BitmapIndexedNode {