fix: strip export keywords from browser-injected scripts

browserScript.ts reads compiled serialize.js and logUncaughtErrors.js
at runtime and injects them into the browser via page.evaluate().
With ESM output, these files have `export` keywords which are invalid
in non-module browser script context. Strip them on read.

Assisted-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bennypowers

packages/browser-logs/src/browserScript.ts

@@ -2,13 +2,18 @@ import fs from 'fs';
 import path from 'path';
 
 const REGEXP_SOURCE_MAP = /\/\/# sourceMappingURL=.*/;
+const REGEXP_EXPORT = /^export /gm;
 
+// @ts-ignore import.meta.dirname works at runtime on Node 24
+const __dir = import.meta.dirname;
 const serializeScript = fs
-  .readFileSync(path.resolve(import.meta.dirname, 'serialize.js'), 'utf-8')
-  .replace(REGEXP_SOURCE_MAP, '');
+  .readFileSync(path.resolve(__dir, 'serialize.js'), 'utf-8')
+  .replace(REGEXP_SOURCE_MAP, '')
+  .replace(REGEXP_EXPORT, '');
 const logUncaughtErrorsScript = fs
-  .readFileSync(path.resolve(import.meta.dirname, 'logUncaughtErrors.js'), 'utf-8')
-  .replace(REGEXP_SOURCE_MAP, '');
+  .readFileSync(path.resolve(__dir, 'logUncaughtErrors.js'), 'utf-8')
+  .replace(REGEXP_SOURCE_MAP, '')
+  .replace(REGEXP_EXPORT, '');
 
 /**
  * Create the browser script as an IIFE wrapper.