debt - load onigasm lazy

src/vs/code/browser/workbench/workbench.html

@@ -37,7 +37,6 @@
 
 		<!-- Prefetch to avoid waterfall -->
 		<link rel="prefetch" href="./static/node_modules/semver-umd/lib/semver-umd.js">
-		<link rel="prefetch" href="./static/node_modules/onigasm-umd/release/main.js"> <!-- TODO@ben TODO@alex: should be lazy -->
 		<link rel="prefetch" href="./static/out/vs/code/browser/workbench/web.main.js"> <!--TODO@ben: Why is it not built -->
 		<link rel="prefetch" href="./static/node_modules/@microsoft/applicationinsights-web/dist/applicationinsights-web.js">
 	</head>

src/vs/workbench/services/textMate/browser/textMateService.ts

@@ -6,8 +6,7 @@
 import { ITextMateService } from 'vs/workbench/services/textMate/common/textMateService';
 import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
 import { AbstractTextMateService } from 'vs/workbench/services/textMate/browser/abstractTextMateService';
-import * as vscodeTextmate from 'vscode-textmate';
-import * as onigasm from 'onigasm-umd';
+import { IOnigLib } from 'vscode-textmate';
 import { IModeService } from 'vs/editor/common/services/modeService';
 import { IFileService } from 'vs/platform/files/common/files';
 import { ILogService } from 'vs/platform/log/common/log';
@@ -34,21 +33,25 @@ export class TextMateService extends AbstractTextMateService {
 		return import('vscode-textmate');
 	}
 
-	protected _loadOnigLib(): Promise<vscodeTextmate.IOnigLib> | undefined {
+	protected _loadOnigLib(): Promise<IOnigLib> | undefined {
 		return loadOnigasm();
 	}
 }
 
-let onigasmPromise: Promise<vscodeTextmate.IOnigLib> | null = null;
-async function loadOnigasm(): Promise<vscodeTextmate.IOnigLib> {
+let onigasmPromise: Promise<IOnigLib> | null = null;
+async function loadOnigasm(): Promise<IOnigLib> {
 	if (!onigasmPromise) {
 		onigasmPromise = doLoadOnigasm();
 	}
 	return onigasmPromise;
 }
 
-async function doLoadOnigasm(): Promise<vscodeTextmate.IOnigLib> {
-	const wasmBytes = await loadOnigasmWASM();
+async function doLoadOnigasm(): Promise<IOnigLib> {
+	const [wasmBytes, onigasm] = await Promise.all([
+		loadOnigasmWASM(),
+		import('onigasm-umd')
+	]);
+
 	await onigasm.loadWASM(wasmBytes);
 	return {
 		createOnigScanner(patterns: string[]) { return new onigasm.OnigScanner(patterns); },