src/vs/workbench/contrib/notebook/browser/view/renderers/backLayerWebView.ts/BackLayerWebView/_handleHighlightCodeBlock
class BackLayerWebView:	private _handleHighlightCodeBlock(codeBlocks: ReadonlyArray<ICodeBlockHighlightRequest>) {
		for (const { id, value, lang } of codeBlocks) {
			// The language id may be a language aliases (e.g.js instead of javascript)
			const languageId = this.languageService.getLanguageIdByLanguageName(lang);
			if (!languageId) {
				continue;
			}

			tokenizeToString(this.languageService, value, languageId).then((html) => {
				if (this._disposed) {
					return;
				}
				this._sendMessageToWebview({
					type: 'tokenizedCodeBlock',
					html,
					codeBlockId: id
				});
			});
		}
	}