Is there a way to parse an input document before remark?

[NullVoxPopuli]

I had thought that .use() order determined the order of parsing, but I'm seeing in https://jsbin.com/negirizaxe/1/edit?html,output

(the @glimmer/syntax example (you'll want to open the browser console, too)

that the initial tree is parsed, as it if were markdown?

Input
 root[5] (1:1-21:1, 0-232)
├─0 heading[1] (2:1-2:8, 5-12)
│   │ depth: 1
│   └─0 text "Title" (2:3-2:8, 7-12)
├─1 paragraph[5] (4:1-4:31, 14-44)
│   ├─0 text "some " (4:1-4:6, 14-19)
│   ├─1 emphasis[1] (4:6-4:12, 19-25)
│   │   └─0 text "bold" (4:7-4:11, 20-24)
│   ├─2 text " and " (4:12-4:17, 25-30)
│   ├─3 emphasis[1] (4:17-4:25, 30-38)
│   │   └─0 text "italic" (4:18-4:24, 31-37)
│   └─4 text " text." (4:25-4:31, 38-44)
├─2 html "<AComponent />" (6:1-6:15, 46-60)

printed from:

       console.log('Parsed w/ Glimmer', glimmerSyntax.preprocess(example));
       
       let usingGlimmerSyntax = await unified()
        .use(inspector(), { label: 'Input' })
        .use(() => (tree) => {
          // I was poking around in here, but found that `glimmerSyntax.preprocess` (the text -> AST util), requires a valid document
          // and text / html nodes are not valid document fragments, as they'll have unclosed or unbegun HTML nodes.
          // so I thought, maybe I could parse with glimmer _first_?, but the inspector showed that the tree was already parsed.
          visit(tree, ['text', 'html', 'raw'], function (node) {
          
          });
        })
        .use(remarkParse)
        .use(inspector(), { label: 'Parsed Markdown' })
        .use(liveCodeExtraction, liveCodeConfig)
        .use(remarkRehype, {allowDangerousHtml: true})
        .use(rehypeRaw, { passThrough: ['glimmer_raw'] })
        .use(rehypeStringify, stringifyConfig)
        .process(example);

[wooorm]

remark is an ecosystem around unified. I guess you mean remark-parse, which is a plugin?

remark-parse is a plugin that specifies a parser. You cannot do things before parsers. They’re the first thing.
Some other plugins specify transforms. There are several transforms. So you can run things before and after other transforms.
But you cannot do things before the first thing.

See https://github.com/unifiedjs/unified#overview for how unified works.