Configure Marp to syntax highlight Chapel

Signed-off-by: Danila Fedorin <daniel.fedorin@hpe.com>

engine.js

@@ -0,0 +1,26 @@
+// https://github.com/orgs/marp-team/discussions/422#discussioncomment-5268779
+
+const { Marp } = require('@marp-team/marp-core')
+const hljs = require('highlight.js')
+
+// highlightjs-chapel for static web page is required a globally exposed `hljs` to
+// extend highlight.js.
+globalThis.hljs = hljs
+
+require('highlightjs-chapel/dist/chapel.min.js')
+
+// Create extended Marp class from an original Marp Core.
+class MarpWithHighlightJSChapel extends Marp {
+  // Overload highlighter to use highlight.js with extended by highlightjs-chapel.
+  highlighter(code, lang, _attrs) {
+    if (lang && hljs.getLanguage(lang)) {
+      return hljs.highlight(code, {
+        language: lang,
+        ignoreIllegals: true,
+      }).value
+    }
+    return ''
+  }
+}
+
+module.exports = MarpWithHighlightJSChapel

package.json

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+{
+  "devDependencies": {
+    "@marp-team/marp-cli": "^4.2.3",
+    "highlightjs-chapel": "^0.1.0"
+  }
+}