feat(core): split exports by browser/server for bundle size

Split the exports from `@sentry/core` into three options:

- `@sentry/core`, the default (unchanged)
- `@sentry/core/browser`, containing _only_ shared and browser-specific
  functionality, nothing server-specific.
- `@sentry/core/server`, containing _only_ shared and server-specific
  functionality, nothing browser-specific.

This should allow us to make the bundle sizes quite a bit smaller in our
browser SDKs where this is important, while adding more functionality to
our server-specific SDKs, in `@sentry/core` where they can be easily
shared across runtimes.

Integration may require updating our `tsconfig` settings so that tsc
knows it is allowed to look on `package.json` exports.

fix: #20434
fix: JS-2243

Author: isaacs

packages/core/package.json

@@ -17,6 +17,26 @@
   "types": "build/types/index.d.ts",
   "exports": {
     "./package.json": "./package.json",
+    "./server": {
+      "import": {
+        "types": "./build/types/server.d.ts",
+        "default": "./build/esm/server.js"
+      },
+      "require": {
+        "types": "./build/types/server.d.ts",
+        "default": "./build/cjs/server.js"
+      }
+    },
+    "./browser": {
+      "import": {
+        "types": "./build/types/browser.d.ts",
+        "default": "./build/esm/browser.js"
+      },
+      "require": {
+        "types": "./build/types/browser.d.ts",
+        "default": "./build/cjs/browser.js"
+      }
+    },
     ".": {
       "import": {
         "types": "./build/types/index.d.ts",

packages/core/rollup.npm.config.mjs

@@ -14,26 +14,31 @@ if (!packageJson.version) {
 
 const packageVersion = packageJson.version;
 
+const settings = {
+  packageSpecificConfig: {
+    output: {
+      // set exports to 'named' or 'auto' so that rollup doesn't warn
+      exports: 'named',
+      // set preserveModules to true because we don't want to bundle everything into one file.
+      preserveModules:
+        process.env.SENTRY_BUILD_PRESERVE_MODULES === undefined
+          ? true
+          : Boolean(process.env.SENTRY_BUILD_PRESERVE_MODULES),
+    },
+    plugins: [
+      replace({
+        preventAssignment: true,
+        values: {
+          __SENTRY_SDK_VERSION__: JSON.stringify(packageVersion),
+        },
+      }),
+    ],
+  },
+};
+
 export default makeNPMConfigVariants(
   makeBaseNPMConfig({
-    packageSpecificConfig: {
-      output: {
-        // set exports to 'named' or 'auto' so that rollup doesn't warn
-        exports: 'named',
-        // set preserveModules to true because we don't want to bundle everything into one file.
-        preserveModules:
-          process.env.SENTRY_BUILD_PRESERVE_MODULES === undefined
-            ? true
-            : Boolean(process.env.SENTRY_BUILD_PRESERVE_MODULES),
-      },
-      plugins: [
-        replace({
-          preventAssignment: true,
-          values: {
-            __SENTRY_SDK_VERSION__: JSON.stringify(packageVersion),
-          },
-        }),
-      ],
-    },
+    ...settings,
+    entrypoints: ['src/index.ts', 'src/server.ts', 'src/browser.ts'],
   }),
 );

packages/core/src/browser-exports.ts

@@ -0,0 +1,20 @@
+// Browser-only: DOM utilities
+export { getComponentName, getLocationHref, htmlTreeAsString } from './utils/browser';
+
+// Browser-only: feature detection for browser APIs
+export { supportsDOMError, supportsHistory, supportsNativeFetch, supportsReportingObserver } from './utils/supports';
+
+// Browser-only: XHR and DOM breadcrumb types
+export type { XhrBreadcrumbData, XhrBreadcrumbHint } from './types-hoist/breadcrumb';
+
+// Browser-only: XHR and DOM handler types
+export type {
+  HandlerDataXhr,
+  HandlerDataDom,
+  HandlerDataHistory,
+  SentryXhrData,
+  SentryWrappedXMLHttpRequest,
+} from './types-hoist/instrument';
+
+// Browser-only: replay and profiling options
+export type { BrowserClientReplayOptions, BrowserClientProfilingOptions } from './types-hoist/browseroptions';

packages/core/src/browser.ts

@@ -0,0 +1,4 @@
+/* eslint-disable max-lines */
+
+export * from './shared-exports';
+export * from './browser-exports';