@observablehq/highlight.js/async-languages/handlebars.js

Syntax highlighting with language autodetection.

/*
Language: Handlebars
Requires: xml.js
Author: Robin Ward <robin.ward@gmail.com>
Description: Matcher for Handlebars as well as EmberJS additions.
Category: template
*/

define(["./xml.js"], (...$requiredLanguages) => function(hljs) {
        hljs.registerLanguage("xml", $requiredLanguages[0]);
          
          
  var BUILT_INS = {'builtin-name': 'each in with if else unless bindattr action collection debugger log outlet template unbound view yield'};
  return {
    aliases: ['hbs', 'html.hbs', 'html.handlebars'],
    case_insensitive: true,
    subLanguage: 'xml',
    contains: [
    hljs.COMMENT('{{!(--)?', '(--)?}}'),
      {
        className: 'template-tag',
        begin: /\{\{[#\/]/, end: /\}\}/,
        contains: [
          {
            className: 'name',
            begin: /[a-zA-Z\.-]+/,
            keywords: BUILT_INS,
            starts: {
              endsWithParent: true, relevance: 0,
              contains: [
                hljs.QUOTE_STRING_MODE
              ]
            }
          }
        ]
      },
      {
        className: 'template-variable',
        begin: /\{\{/, end: /\}\}/,
        keywords: BUILT_INS
      }
    ]
  };
}
)