extensions/markdown-language-features/src/markdownEngine.ts/MarkdownEngine/constructor
class MarkdownEngine:	public constructor(
		private readonly contributionProvider: MarkdownContributionProvider,
		private readonly slugifier: Slugifier,
	) {
		contributionProvider.onContributionsChanged(() => {
			// Markdown plugin contributions may have changed
			this.md = undefined;
		});
	}