Method constructor

js/src/index.ts:752–762

(
    maxCacheEntries = 100,
    prefetch = true, // deprecated
    decompress: DecompressFunc = defaultDecompress
  )

  decompress: DecompressFunc;

  constructor(
    maxCacheEntries = 100,
    prefetch = true, // deprecated
    decompress: DecompressFunc = defaultDecompress
  ) {
    this.cache = new Map<string, SharedPromiseCacheValue>();
    this.invalidations = new Map<string, Promise<void>>();
    this.maxCacheEntries = maxCacheEntries;
    this.counter = 1;
    this.decompress = decompress;
  }

  async getHeader(source: Source): Promise<Header> {
    const cacheKey = source.getKey();