Map([
  [&quot;a.grammar&quot;, &quot;...&quot;],
  [&quot;b.grammar&quot;, &quot;...&quot;]
]);
const host = new CoreAsyncHost({
  ignoreCase: false,
  useBuiltinGrammers: false,
  resolveFile: file =&gt; file,
  readFile: file =&gt; files.get(file)
});
</code></pre></section>
</div>

  <h3 id="constructors">Constructors
  </h3>
  
  
  <h4 id="grammarkdown_CoreAsyncHost_constructor_1_" data-uid="grammarkdown!CoreAsyncHost:constructor(1)">constructor(options, hostFallback)</h4>
  <div class="markdown