fix: improve performance by loading sax-wasm only once

Author: daKmoR

.changeset/popular-llamas-fly.md

@@ -0,0 +1,6 @@
+---
+'@rocket/cli': patch
+'@rocket/eleventy-rocket-nav': patch
+---
+
+Improve performance by initializing sax-wasm only once even when it is running in parallel

packages/cli/src/eleventy-plugins/insertResponsiveImages.cjs

@@ -243,9 +243,9 @@ async function insertResponsiveImages(html) {
   const config = getComputedConfig();
 
   if (!isSetup) {
-    await parser.prepareWasm(saxWasmBuffer);
-    isSetup = true;
+    isSetup = parser.prepareWasm(saxWasmBuffer);
   }
+  await isSetup;
 
   const options = {
     inputPath: this.inputPath,

packages/eleventy-rocket-nav/src/addPageAnchors.js

@@ -97,16 +97,17 @@ function getHeadingsOfHtml(html) {
   return { headings, insertPoint };
 }
 
+/** @type {boolean | Promise<unknown>} */
 let isSetup = false;
 
 /**
  * @param {string} content
  */
 async function addPageAnchors(content) {
   if (!isSetup) {
-    await parser.prepareWasm(saxWasmBuffer);
-    isSetup = true;
+    isSetup = parser.prepareWasm(saxWasmBuffer);
   }
+  await isSetup;
 
   const { headings, insertPoint } = getHeadingsOfHtml(content);
   const pageAnchorsHtml = [];