fix(core): Make moduleMetadata injection snippet ES5-compliant (#774)

Makes the `moduleMetadata` injection code snippet fully ES5-compliant by replacing `Object.assign` with an ES5-native `assign` "polyfill".

Author: Lms24

packages/bundler-plugin-core/src/utils.ts

@@ -334,7 +334,7 @@ export function generateModuleMetadataInjectorCode(metadata: any): string {
   // The code below is mostly ternary operators because it saves bundle size.
   // The checks are to support as many environments as possible. (Node.js, Browser, webworkers, etc.)
   // We are merging the metadata objects in case modules are bundled twice with the plugin
-  return `!function(){var e="undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof globalThis?globalThis:"undefined"!=typeof self?self:{};e._sentryModuleMetadata=e._sentryModuleMetadata||{},e._sentryModuleMetadata[(new e.Error).stack]=Object.assign({},e._sentryModuleMetadata[(new e.Error).stack],${JSON.stringify(
+  return `!function(){var e="undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof globalThis?globalThis:"undefined"!=typeof self?self:{};e._sentryModuleMetadata=e._sentryModuleMetadata||{},e._sentryModuleMetadata[(new e.Error).stack]=function(e){for(var n=1;n<arguments.length;n++){var a=arguments[n];if(null!=a)for(var t in a)a.hasOwnProperty(t)&&(e[t]=a[t])}return e}({},e._sentryModuleMetadata[(new e.Error).stack],${JSON.stringify(
     metadata
   )})}();`;
 }

packages/bundler-plugin-core/test/__snapshots__/utils.test.ts.snap

@@ -4,6 +4,6 @@ exports[`generateGlobalInjectorCode generates code with release 1`] = `"!functio
 
 exports[`generateGlobalInjectorCode generates code with release and build information 1`] = `"!function(){var e=\\"undefined\\"!=typeof window?window:\\"undefined\\"!=typeof global?global:\\"undefined\\"!=typeof globalThis?globalThis:\\"undefined\\"!=typeof self?self:{};e.SENTRY_RELEASE={id:\\"1.2.3\\"};e.SENTRY_BUILD_INFO={\\"deps\\":[\\"myDep\\",\\"rollup\\"],\\"depsVersions\\":{\\"rollup\\":3},\\"nodeVersion\\":18};}();"`;
 
-exports[`generateModuleMetadataInjectorCode generates code with empty metadata object 1`] = `"!function(){var e=\\"undefined\\"!=typeof window?window:\\"undefined\\"!=typeof global?global:\\"undefined\\"!=typeof globalThis?globalThis:\\"undefined\\"!=typeof self?self:{};e._sentryModuleMetadata=e._sentryModuleMetadata||{},e._sentryModuleMetadata[(new e.Error).stack]=Object.assign({},e._sentryModuleMetadata[(new e.Error).stack],{})}();"`;
+exports[`generateModuleMetadataInjectorCode generates code with empty metadata object 1`] = `"!function(){var e=\\"undefined\\"!=typeof window?window:\\"undefined\\"!=typeof global?global:\\"undefined\\"!=typeof globalThis?globalThis:\\"undefined\\"!=typeof self?self:{};e._sentryModuleMetadata=e._sentryModuleMetadata||{},e._sentryModuleMetadata[(new e.Error).stack]=function(e){for(var n=1;n<arguments.length;n++){var a=arguments[n];if(null!=a)for(var t in a)a.hasOwnProperty(t)&&(e[t]=a[t])}return e}({},e._sentryModuleMetadata[(new e.Error).stack],{})}();"`;
 
-exports[`generateModuleMetadataInjectorCode generates code with metadata object 1`] = `"!function(){var e=\\"undefined\\"!=typeof window?window:\\"undefined\\"!=typeof global?global:\\"undefined\\"!=typeof globalThis?globalThis:\\"undefined\\"!=typeof self?self:{};e._sentryModuleMetadata=e._sentryModuleMetadata||{},e._sentryModuleMetadata[(new e.Error).stack]=Object.assign({},e._sentryModuleMetadata[(new e.Error).stack],{\\"file1.js\\":{\\"foo\\":\\"bar\\"},\\"file2.js\\":{\\"bar\\":\\"baz\\"}})}();"`;
+exports[`generateModuleMetadataInjectorCode generates code with metadata object 1`] = `"!function(){var e=\\"undefined\\"!=typeof window?window:\\"undefined\\"!=typeof global?global:\\"undefined\\"!=typeof globalThis?globalThis:\\"undefined\\"!=typeof self?self:{};e._sentryModuleMetadata=e._sentryModuleMetadata||{},e._sentryModuleMetadata[(new e.Error).stack]=function(e){for(var n=1;n<arguments.length;n++){var a=arguments[n];if(null!=a)for(var t in a)a.hasOwnProperty(t)&&(e[t]=a[t])}return e}({},e._sentryModuleMetadata[(new e.Error).stack],{\\"file1.js\\":{\\"foo\\":\\"bar\\"},\\"file2.js\\":{\\"bar\\":\\"baz\\"}})}();"`;