diff --git a/packages/core/.npmignore b/packages/core/.npmignore
index 8904efca5aea..0514c96743ba 100644
--- a/packages/core/.npmignore
+++ b/packages/core/.npmignore
@@ -1,4 +1,9 @@
+# Info: the paths in this file are specified so that they align with the file
+# structure in `./build` where this file is copied to. This is done by the
+# prepack script `sentry-javascript/scripts/prepack.ts`.
+
 *
+
 !/dist/**/*
 !/esm/**/*
-!/build/types/**/*
+!/types/**/*
diff --git a/packages/core/package.json b/packages/core/package.json
index 1140f6247e10..eea768058926 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -9,8 +9,8 @@
   "engines": {
     "node": ">=6"
   },
-  "main": "dist/index.js",
-  "module": "esm/index.js",
+  "main": "build/dist/index.js",
+  "module": "build/esm/index.js",
   "types": "build/types/index.d.ts",
   "publishConfig": {
     "access": "public"
@@ -35,9 +35,9 @@
     "build:es5:watch": "yarn build:cjs:watch # *** backwards compatibility - remove in v7 ***",
     "build:esm:watch": "tsc -p tsconfig.esm.json --watch",
     "build:types:watch": "tsc -p tsconfig.types.json --watch",
-    "build:npm": "npm pack",
+    "build:npm": "ts-node ../../scripts/prepack.ts -noBundles && npm pack ./build",
     "circularDepCheck": "madge --circular src/index.ts",
-    "clean": "rimraf dist esm coverage",
+    "clean": "rimraf dist esm build coverage",
     "fix": "run-s fix:eslint fix:prettier",
     "fix:eslint": "eslint . --format stylish --fix",
     "fix:prettier": "prettier --write \"{src,test,scripts}/**/*.ts\"",
diff --git a/packages/core/tsconfig.cjs.json b/packages/core/tsconfig.cjs.json
index abd80f77e1ff..e3a918fc70af 100644
--- a/packages/core/tsconfig.cjs.json
+++ b/packages/core/tsconfig.cjs.json
@@ -3,6 +3,6 @@
 
   "compilerOptions": {
     "module": "commonjs",
-    "outDir": "dist"
+    "outDir": "build/dist"
   }
 }
diff --git a/packages/core/tsconfig.esm.json b/packages/core/tsconfig.esm.json
index b6ee3fa615c0..0b86c52918cc 100644
--- a/packages/core/tsconfig.esm.json
+++ b/packages/core/tsconfig.esm.json
@@ -3,6 +3,6 @@
 
   "compilerOptions": {
     "module": "es6",
-    "outDir": "esm"
+    "outDir": "build/esm"
   }
 }
diff --git a/packages/gatsby/.eslintrc.js b/packages/gatsby/.eslintrc.js
index 54e8382b22a8..ab610a82206a 100644
--- a/packages/gatsby/.eslintrc.js
+++ b/packages/gatsby/.eslintrc.js
@@ -6,5 +6,8 @@ module.exports = {
   parserOptions: {
     jsx: true,
   },
+  // ignoring the package-specific prepack script here b/c it is not
+  // covered by a `tsconfig` which makes eslint throw an error
+  ignorePatterns: ['scripts/prepack.ts'],
   extends: ['../../.eslintrc.js'],
 };
diff --git a/packages/gatsby/.npmignore b/packages/gatsby/.npmignore
index 4822f65571c0..fb585a43c956 100644
--- a/packages/gatsby/.npmignore
+++ b/packages/gatsby/.npmignore
@@ -1,6 +1,13 @@
+# Info: the paths in this file are specified so that they align with the file
+# structure in `./build` where this file is copied to. This is done by the
+# prepack script `sentry-javascript/scripts/prepack.ts`.
+
 *
+
 !/dist/**/*
 !/esm/**/*
-!/build/types/**/*
+!/types/**/*
+
+# Gatsby specific
 !gatsby-browser.js
 !gatsby-node.js
diff --git a/packages/gatsby/package.json b/packages/gatsby/package.json
index 982795ac1e0c..1ba4b1793c10 100644
--- a/packages/gatsby/package.json
+++ b/packages/gatsby/package.json
@@ -13,8 +13,8 @@
   "engines": {
     "node": ">=6"
   },
-  "main": "dist/index.js",
-  "module": "esm/index.js",
+  "main": "build/dist/index.js",
+  "module": "build/esm/index.js",
   "types": "build/types/index.d.ts",
   "publishConfig": {
     "access": "public"
@@ -46,7 +46,7 @@
     "build:es5:watch": "yarn build:cjs:watch # *** backwards compatibility - remove in v7 ***",
     "build:esm:watch": "tsc -p tsconfig.esm.json --watch",
     "build:types:watch": "tsc -p tsconfig.types.json --watch",
-    "build:npm": "npm pack",
+    "build:npm": "ts-node ../../scripts/prepack.ts -noBundles && npm pack ./build",
     "circularDepCheck": "madge --circular src/index.ts",
     "clean": "rimraf dist esm build coverage",
     "fix": "run-s fix:eslint fix:prettier",
diff --git a/packages/gatsby/scripts/prepack.ts b/packages/gatsby/scripts/prepack.ts
new file mode 100644
index 000000000000..5aa95909d70c
--- /dev/null
+++ b/packages/gatsby/scripts/prepack.ts
@@ -0,0 +1,27 @@
+/* eslint-disable no-console */
+
+// DO NOT RUN this script yourself!
+// This is invoked from the main `prepack.ts` script in `sentry-javascript/scripts/prepack.ts`.
+
+import * as fs from 'fs';
+import * as path from 'path';
+
+const PACKAGE_ASSETS = ['gatsby-browser.js', 'gatsby-node.js'];
+
+export function prepack(buildDir: string): boolean {
+  // copy package-specific assets to build dir
+  return PACKAGE_ASSETS.every(asset => {
+    const assetPath = path.resolve(asset);
+    try {
+      if (!fs.existsSync(assetPath)) {
+        console.error(`Asset ${asset} does not exist.`);
+        return false;
+      }
+      fs.copyFileSync(assetPath, path.resolve(buildDir, asset));
+    } catch (error) {
+      console.error(`Error while copying ${asset} to ${buildDir}`);
+      return false;
+    }
+    return true;
+  });
+}
diff --git a/packages/gatsby/tsconfig.cjs.json b/packages/gatsby/tsconfig.cjs.json
index abd80f77e1ff..e3a918fc70af 100644
--- a/packages/gatsby/tsconfig.cjs.json
+++ b/packages/gatsby/tsconfig.cjs.json
@@ -3,6 +3,6 @@
 
   "compilerOptions": {
     "module": "commonjs",
-    "outDir": "dist"
+    "outDir": "build/dist"
   }
 }
diff --git a/packages/gatsby/tsconfig.esm.json b/packages/gatsby/tsconfig.esm.json
index b6ee3fa615c0..0b86c52918cc 100644
--- a/packages/gatsby/tsconfig.esm.json
+++ b/packages/gatsby/tsconfig.esm.json
@@ -3,6 +3,6 @@
 
   "compilerOptions": {
     "module": "es6",
-    "outDir": "esm"
+    "outDir": "build/esm"
   }
 }
diff --git a/packages/hub/.npmignore b/packages/hub/.npmignore
index 8904efca5aea..0514c96743ba 100644
--- a/packages/hub/.npmignore
+++ b/packages/hub/.npmignore
@@ -1,4 +1,9 @@
+# Info: the paths in this file are specified so that they align with the file
+# structure in `./build` where this file is copied to. This is done by the
+# prepack script `sentry-javascript/scripts/prepack.ts`.
+
 *
+
 !/dist/**/*
 !/esm/**/*
-!/build/types/**/*
+!/types/**/*
diff --git a/packages/hub/package.json b/packages/hub/package.json
index f274d7d5d5c2..8f40d5e0ffd1 100644
--- a/packages/hub/package.json
+++ b/packages/hub/package.json
@@ -9,8 +9,8 @@
   "engines": {
     "node": ">=6"
   },
-  "main": "dist/index.js",
-  "module": "esm/index.js",
+  "main": "build/dist/index.js",
+  "module": "build/esm/index.js",
   "types": "build/types/index.d.ts",
   "publishConfig": {
     "access": "public"
@@ -33,6 +33,7 @@
     "build:es5:watch": "yarn build:cjs:watch # *** backwards compatibility - remove in v7 ***",
     "build:esm:watch": "tsc -p tsconfig.esm.json --watch",
     "build:types:watch": "tsc -p tsconfig.types.json --watch",
+    "build:npm": "ts-node ../../scripts/prepack.ts -noBundles && npm pack ./build",
     "circularDepCheck": "madge --circular src/index.ts",
     "clean": "rimraf dist esm coverage",
     "fix": "run-s fix:eslint fix:prettier",
@@ -41,8 +42,7 @@
     "link:yarn": "yarn link",
     "lint": "run-s lint:prettier lint:eslint",
     "lint:eslint": "eslint . --cache --cache-location '../../eslintcache/' --format stylish",
-    "lint:prettier": "prettier --check \"{src,test,scripts}/**/*.ts\"",
-    "build:npm": "npm pack",
+    "lint:prettier": "prettier --check \"{src,test}/**/*.ts\"",
     "test": "jest",
     "test:watch": "jest --watch"
   },
diff --git a/packages/hub/tsconfig.cjs.json b/packages/hub/tsconfig.cjs.json
index abd80f77e1ff..e3a918fc70af 100644
--- a/packages/hub/tsconfig.cjs.json
+++ b/packages/hub/tsconfig.cjs.json
@@ -3,6 +3,6 @@
 
   "compilerOptions": {
     "module": "commonjs",
-    "outDir": "dist"
+    "outDir": "build/dist"
   }
 }
diff --git a/packages/hub/tsconfig.esm.json b/packages/hub/tsconfig.esm.json
index b6ee3fa615c0..0b86c52918cc 100644
--- a/packages/hub/tsconfig.esm.json
+++ b/packages/hub/tsconfig.esm.json
@@ -3,6 +3,6 @@
 
   "compilerOptions": {
     "module": "es6",
-    "outDir": "esm"
+    "outDir": "build/esm"
   }
 }
diff --git a/packages/minimal/.npmignore b/packages/minimal/.npmignore
index 8904efca5aea..0514c96743ba 100644
--- a/packages/minimal/.npmignore
+++ b/packages/minimal/.npmignore
@@ -1,4 +1,9 @@
+# Info: the paths in this file are specified so that they align with the file
+# structure in `./build` where this file is copied to. This is done by the
+# prepack script `sentry-javascript/scripts/prepack.ts`.
+
 *
+
 !/dist/**/*
 !/esm/**/*
-!/build/types/**/*
+!/types/**/*
diff --git a/packages/minimal/package.json b/packages/minimal/package.json
index 671047736311..7caf902785cb 100644
--- a/packages/minimal/package.json
+++ b/packages/minimal/package.json
@@ -9,8 +9,8 @@
   "engines": {
     "node": ">=6"
   },
-  "main": "dist/index.js",
-  "module": "esm/index.js",
+  "main": "build/dist/index.js",
+  "module": "build/esm/index.js",
   "types": "build/types/index.d.ts",
   "publishConfig": {
     "access": "public"
@@ -33,8 +33,9 @@
     "build:es5:watch": "yarn build:cjs:watch # *** backwards compatibility - remove in v7 ***",
     "build:esm:watch": "tsc -p tsconfig.esm.json --watch",
     "build:types:watch": "tsc -p tsconfig.types.json --watch",
+    "build:npm": "ts-node ../../scripts/prepack.ts -noBundles && npm pack ./build",
     "circularDepCheck": "madge --circular src/index.ts",
-    "clean": "rimraf dist esm coverage",
+    "clean": "rimraf dist esm build coverage",
     "fix": "run-s fix:eslint fix:prettier",
     "fix:eslint": "eslint . --format stylish --fix",
     "fix:prettier": "prettier --write \"{src,test,scripts}/**/*.ts\"",
@@ -42,7 +43,6 @@
     "lint": "run-s lint:prettier lint:eslint",
     "lint:eslint": "eslint . --cache --cache-location '../../eslintcache/' --format stylish",
     "lint:prettier": "prettier --check \"{src,test,scripts}/**/*.ts\"",
-    "build:npm": "npm pack",
     "test": "jest",
     "test:watch": "jest --watch"
   },
diff --git a/packages/minimal/tsconfig.cjs.json b/packages/minimal/tsconfig.cjs.json
index abd80f77e1ff..e3a918fc70af 100644
--- a/packages/minimal/tsconfig.cjs.json
+++ b/packages/minimal/tsconfig.cjs.json
@@ -3,6 +3,6 @@
 
   "compilerOptions": {
     "module": "commonjs",
-    "outDir": "dist"
+    "outDir": "build/dist"
   }
 }
diff --git a/packages/minimal/tsconfig.esm.json b/packages/minimal/tsconfig.esm.json
index b6ee3fa615c0..0b86c52918cc 100644
--- a/packages/minimal/tsconfig.esm.json
+++ b/packages/minimal/tsconfig.esm.json
@@ -3,6 +3,6 @@
 
   "compilerOptions": {
     "module": "es6",
-    "outDir": "esm"
+    "outDir": "build/esm"
   }
 }
diff --git a/scripts/prepack.ts b/scripts/prepack.ts
index beecd1230f38..ea8b7ed97770 100644
--- a/scripts/prepack.ts
+++ b/scripts/prepack.ts
@@ -11,18 +11,23 @@ import * as fse from 'fs-extra';
 import * as path from 'path';
 
 const NPM_BUILD_DIR = 'build/npm';
+const BUILD_DIR = 'build';
+
 const ASSETS = ['README.md', 'LICENSE', 'package.json', '.npmignore'];
 const ENTRY_POINTS = ['main', 'module', 'types'];
 
+const packageWithBundles = !process.argv.includes('-noBundles');
+const buildDir = packageWithBundles ? NPM_BUILD_DIR : BUILD_DIR;
+
 // check if build dir exists
 try {
-  if (!fs.existsSync(path.resolve(NPM_BUILD_DIR))) {
-    console.error(`Directory ${NPM_BUILD_DIR} DOES NOT exist`);
+  if (!fs.existsSync(path.resolve(buildDir))) {
+    console.error(`Directory ${buildDir} DOES NOT exist`);
     console.error("This script should only be executed after you've run `yarn build`.");
     process.exit(1);
   }
 } catch (error) {
-  console.error(`Error while looking up directory ${NPM_BUILD_DIR}`);
+  console.error(`Error while looking up directory ${buildDir}`);
   process.exit(1);
 }
 
@@ -34,9 +39,9 @@ ASSETS.forEach(asset => {
       console.error(`Asset ${asset} does not exist.`);
       process.exit(1);
     }
-    fs.copyFileSync(assetPath, path.resolve(NPM_BUILD_DIR, asset));
+    fs.copyFileSync(assetPath, path.resolve(buildDir, asset));
   } catch (error) {
-    console.error(`Error while copying ${asset} to ${NPM_BUILD_DIR}`);
+    console.error(`Error while copying ${asset} to ${buildDir}`);
     process.exit(1);
   }
 });
@@ -45,9 +50,9 @@ ASSETS.forEach(asset => {
 // copy CDN bundles into npm dir to temporarily keep bundles in npm tarball
 // inside the tarball, they are located in `build/`
 // for now, copy it by default, unless explicitly forbidden via an command line arg
-const tmpCopyBundles = !process.argv.includes('-skipBundleCopy');
+const tmpCopyBundles = packageWithBundles && !process.argv.includes('-skipBundleCopy');
 if (tmpCopyBundles) {
-  const npmTmpBundlesPath = path.resolve(NPM_BUILD_DIR, 'build');
+  const npmTmpBundlesPath = path.resolve(buildDir, 'build');
   const cdnBundlesPath = path.resolve('build', 'bundles');
   try {
     if (!fs.existsSync(npmTmpBundlesPath)) {
@@ -55,18 +60,20 @@ if (tmpCopyBundles) {
     }
     void fse.copy(cdnBundlesPath, npmTmpBundlesPath);
   } catch (error) {
-    console.error(`Error while tmp copying CDN bundles to ${NPM_BUILD_DIR}`);
+    console.error(`Error while tmp copying CDN bundles to ${buildDir}`);
     process.exit(1);
   }
 }
+// end remove
+
 // package.json modifications
-const packageJsonPath = path.resolve(NPM_BUILD_DIR, 'package.json');
+const packageJsonPath = path.resolve(buildDir, 'package.json');
 // eslint-disable-next-line @typescript-eslint/no-var-requires
 const pkgJson: { [key: string]: unknown } = require(packageJsonPath);
 
 // modify entry points to point to correct paths (i.e. strip out the build directory)
 ENTRY_POINTS.filter(entryPoint => pkgJson[entryPoint]).forEach(entryPoint => {
-  pkgJson[entryPoint] = (pkgJson[entryPoint] as string).replace(`${NPM_BUILD_DIR}/`, '');
+  pkgJson[entryPoint] = (pkgJson[entryPoint] as string).replace(`${buildDir}/`, '');
 });
 
 delete pkgJson.scripts;
@@ -81,4 +88,34 @@ try {
   process.exit(1);
 }
 
-console.log(`\nSuccessfully finished prepack commands for ${pkgJson.name}\n`);
+async function runPackagePrepack(packagePrepackPath: string): Promise<void> {
+  const { prepack } = await import(packagePrepackPath);
+  if (prepack && typeof prepack === 'function') {
+    const isSuccess = prepack(buildDir);
+    if (!isSuccess) {
+      process.exit(1);
+    }
+  } else {
+    console.error(`Could not find a prepack function in ${packagePrepackPath}.`);
+    console.error(
+      'Make sure, your package-specific prepack script exports `function prepack(buildDir: string): boolean`.',
+    );
+    process.exit(1);
+  }
+}
+
+// execute package specific settings
+// 1. check if a package called `<package-root>/scripts/prepack.ts` exitsts
+// if yes, 2.) execute that script for things that are package-specific
+void (async () => {
+  const packagePrepackPath = path.resolve('scripts', 'prepack.ts');
+  try {
+    if (fs.existsSync(packagePrepackPath)) {
+      await runPackagePrepack(packagePrepackPath);
+    }
+  } catch (error) {
+    console.error(`Error while trying to access ${packagePrepackPath.toString()}`);
+    process.exit(1);
+  }
+  console.log(`\nSuccessfully finished prepack commands for ${pkgJson.name}\n`);
+})();