reduce bundle size??!

Author: mydea

dev-packages/rollup-utils/plugins/bundlePlugins.mjs

@@ -63,8 +63,9 @@ export function makeIsDebugBuildPlugin(includeDebugging) {
 export function makeSetSDKSourcePlugin(sdkSource) {
   return replace({
     preventAssignment: false,
+    delimiters: ['', ''],
     values: {
-      __SENTRY_SDK_SOURCE__: JSON.stringify(sdkSource),
+      "/* ref:__SENTRY_SDK_SOURCE__ */": `return ${JSON.stringify(sdkSource)};`,
     },
   });
 }

packages/utils/src/env.ts

@@ -15,8 +15,6 @@
 
 declare const __SENTRY_BROWSER_BUNDLE__: boolean | undefined;
 
-declare const __SENTRY_SDK_SOURCE__: SdkSource | undefined;
-
 export type SdkSource = 'npm' | 'cdn' | 'loader';
 
 /**
@@ -32,5 +30,6 @@ export function isBrowserBundle(): boolean {
  * Get source of SDK.
  */
 export function getSDKSource(): SdkSource {
-  return typeof __SENTRY_SDK_SOURCE__ !== 'undefined' ? __SENTRY_SDK_SOURCE__ : 'npm';
+  // This comment is used to identify this line in the CDN bundle build step and replace this with "return 'cdn';"
+  /* ref:__SENTRY_SDK_SOURCE__ */ return 'npm';
 }