refactor: remove getEntriesByType shim now that snippets use buffered observer

Author: nucliweb

cli/src/runner.js

@@ -3,35 +3,6 @@ import { chromium } from "playwright";
 const DEFAULT_VIEWPORT = { width: 1280, height: 800 };
 const DEFAULT_NAV_TIMEOUT = 30000;
 
-// Chrome does not expose largest-contentful-paint or layout-shift entries via
-// performance.getEntriesByType — they are only delivered through observers.
-// The snippets' synchronous return path assumes otherwise (works in
-// long-lived consoles where entries leaked into the timeline). To make
-// snippets work unmodified in headless, we capture entries via a pre-nav
-// observer and shim getEntriesByType to return them.
-const WARMUP_SCRIPT = `
-(() => {
-  window.__wps = { lcp: [], layoutShift: [] };
-  try {
-    new PerformanceObserver((list) => {
-      for (const e of list.getEntries()) window.__wps.lcp.push(e);
-    }).observe({ type: "largest-contentful-paint", buffered: true });
-  } catch {}
-  try {
-    new PerformanceObserver((list) => {
-      for (const e of list.getEntries()) window.__wps.layoutShift.push(e);
-    }).observe({ type: "layout-shift", buffered: true });
-  } catch {}
-
-  const orig = performance.getEntriesByType.bind(performance);
-  performance.getEntriesByType = function (type) {
-    if (type === "largest-contentful-paint") return window.__wps.lcp.slice();
-    if (type === "layout-shift") return window.__wps.layoutShift.slice();
-    return orig(type);
-  };
-})();
-`;
-
 // Snippets are IIFEs. Playwright evaluates a string as an expression, so we
 // trim trailing semicolons to keep the IIFE call as a single expression and
 // recover its return value in Node.
@@ -50,7 +21,6 @@ export async function runSnippets({
   const browser = await chromium.launch({ headless });
   try {
     const context = await browser.newContext({ viewport });
-    await context.addInitScript(WARMUP_SCRIPT);
     const page = await context.newPage();
 
     const pageErrors = [];