An adapter for css-select that allows you to query parse5 generated ASTs.

You'll need css-select and parse5 for this adapter to be of any use, so install all three packages:

npm install \
    css-select \
    css-select-parse5-adapter \
    parse5

const {parse,serialize} = require('parse5');
const {parse5Adapter} = require('css-select-parse5-adapter'); 
const cssSelect = require('css-select');
const ast = parse(`
  <div id="greeting">
    Hello <span class="name">Alice</span>
  </div>
`);
const nodes = cssSelect('#greeting .name', ast, {adapter: parse5adapter});
assert(nodes.length === 1);
assert(serialize(nodes[0]) === 'Alice');

The adapter export from the package is an instance of an Adapter class which is configured to use the defaultTreeAdapter for parse5. If you have a parse5 generated tree which used a different adapter, you can create a new instance of the Parse5Adapter class using that parse5 tree adapter as the constructor argument. At present, there appears to be only one other tree adapter for parse5 which is the parse5-htmlparser2-tree-adapter, but this tree format is actually the default tree type for css-select package, so it would probably be a silly thing to use css-select-parse5-adapter with it. If you did, it would look like the following (keeping example here in the event another parse5 tree adapter shows up on the scene for some reason):

const h2adapter = require('parse5-htmlparser2-tree-adapter');
const {Parse5Adapter} = require('css-select-parse5-adapter');
const cssSelect = require('css-select');
const adapter = new Parse5Adapter(h2adapter);
const nodes = cssSelect('#greeting .name', ast, {adapter});