Add script to inline and strip Prism

Related-to: GH-58.
Closes GH-61.

Co-authored-by: Andrey Okonetchnikov <andrey@okonet.dev>

.gitignore

@@ -3,4 +3,5 @@ node_modules/
 *.d.ts
 *.log
 .DS_Store
+package-lock.json
 yarn.lock

lib/core.js

@@ -32,46 +32,11 @@
  * @property {Languages} languages
  */
 
-/* eslint-disable no-undef */
-// Don’t allow Prism to run on page load in browser or to start messaging from
-// workers.
-/* c8 ignore next 15 */
-/** @type {typeof globalThis} */
-const ctx =
-  typeof globalThis === 'object'
-    ? globalThis
-    : // @ts-expect-error
-    typeof self === 'object'
-    ? // @ts-expect-error
-      self
-    : // @ts-expect-error
-    typeof window === 'object'
-    ? // @ts-expect-error
-      window
-    : typeof global === 'object'
-    ? global
-    : {}
-/* eslint-enable no-undef */
-
-const restore = capture()
-
-/* c8 ignore next 5 */
-ctx.Prism = ctx.Prism || {}
-ctx.Prism.manual = true
-ctx.Prism.disableWorkerMessageHandler = true
-
-/* eslint-disable import/first */
-
 // Load all stuff in `prism.js` itself, except for `prism-file-highlight.js`.
 // The wrapped non-leaky grammars are loaded instead of Prism’s originals.
 import {h} from 'hastscript'
 import {parseEntities} from 'parse-entities'
-// @ts-expect-error: untyped.
-import Prism from 'prismjs/components/prism-core.js'
-
-/* eslint-enable import/first */
-
-restore()
+import {Prism} from './prism-core.js'
 
 const own = {}.hasOwnProperty
 
@@ -137,6 +102,7 @@ function highlight(value, language) {
 
   return {
     type: 'root',
+    // @ts-expect-error: we hacked Prism to accept and return the things we want.
     children: Prism.highlight.call(refractor, value, grammar, name)
   }
 }
@@ -317,33 +283,3 @@ function attributes(attrs) {
 
   return attrs
 }
-
-/**
- * @returns {() => void}
- */
-function capture() {
-  /** @type {boolean|undefined} */
-  let defined = 'Prism' in ctx
-  /* c8 ignore next */
-  let current = defined ? ctx.Prism : undefined
-
-  return restore
-
-  /**
-   * @returns {void}
-   */
-  function restore() {
-    /* istanbul ignore else - Clean leaks after Prism. */
-    if (defined) {
-      // @ts-expect-error: hush.
-      ctx.Prism = current
-      /* c8 ignore next 4 */
-    } else {
-      // @ts-expect-error: hush.
-      delete ctx.Prism
-    }
-
-    defined = undefined
-    current = undefined
-  }
-}