diff --git a/package.json b/package.json
index 5b49d570c7fc..4ac3da2478f9 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
     "packages/angular",
     "packages/browser",
     "packages/core",
+    "packages/dev-utils",
     "packages/ember",
     "packages/eslint-config-sdk",
     "packages/eslint-plugin-sdk",
diff --git a/packages/dev-utils/.eslintrc.js b/packages/dev-utils/.eslintrc.js
new file mode 100644
index 000000000000..5a2cc7f1ec08
--- /dev/null
+++ b/packages/dev-utils/.eslintrc.js
@@ -0,0 +1,3 @@
+module.exports = {
+  extends: ['../../.eslintrc.js'],
+};
diff --git a/packages/dev-utils/LICENSE b/packages/dev-utils/LICENSE
new file mode 100644
index 000000000000..8b42db873c95
--- /dev/null
+++ b/packages/dev-utils/LICENSE
@@ -0,0 +1,29 @@
+BSD 3-Clause License
+
+Copyright (c) 2019, Sentry
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/packages/dev-utils/README.md b/packages/dev-utils/README.md
new file mode 100644
index 000000000000..3cb99e498fa4
--- /dev/null
+++ b/packages/dev-utils/README.md
@@ -0,0 +1,17 @@
+<p align="center">
+  <a href="https://sentry.io" target="_blank" align="center">
+    <img src="https://sentry-brand.storage.googleapis.com/sentry-logo-black.png" width="280">
+  </a>
+  <br />
+</p>
+
+# Sentry JavaScript SDK Developer Utilities
+
+## Links
+
+- [Contribution Guide](https://github.com/getsentry/sentry-javascript/blob/master/CONTRIBUTING.md)
+- [SDK Developer Docs](https://develop.sentry.dev/sdk/)
+
+## General
+
+Common utilities used during development of the Sentry JavaScript SDKs. Internal only, does not follow semver.
diff --git a/packages/dev-utils/jest.config.js b/packages/dev-utils/jest.config.js
new file mode 100644
index 000000000000..24f49ab59a4c
--- /dev/null
+++ b/packages/dev-utils/jest.config.js
@@ -0,0 +1 @@
+module.exports = require('../../jest/jest.config.js');
diff --git a/packages/dev-utils/package.json b/packages/dev-utils/package.json
new file mode 100644
index 000000000000..c30faf35891a
--- /dev/null
+++ b/packages/dev-utils/package.json
@@ -0,0 +1,44 @@
+{
+  "name": "@sentry-internal/dev-utils",
+  "version": "7.0.0-beta.0",
+  "description": "Development utilities for all Sentry JavaScript SDKs",
+  "repository": "git://github.com/getsentry/sentry-javascript.git",
+  "homepage": "https://github.com/getsentry/sentry-javascript/tree/master/packages/dev-utils",
+  "author": "Sentry",
+  "license": "BSD-3-Clause",
+  "engines": {
+    "node": ">=8"
+  },
+  "main": "build/cjs/index.js",
+  "module": "build/esm/index.js",
+  "types": "build/types/index.d.ts",
+  "publishConfig": {
+    "access": "public"
+  },
+  "scripts": {
+    "build": "run-p build:rollup build:types",
+    "build:dev": "run-s build",
+    "build:rollup": "rollup -c rollup.npm.config.js",
+    "build:types": "tsc -p tsconfig.types.json",
+    "build:watch": "run-p build:rollup:watch build:types:watch",
+    "build:dev:watch": "run-s build:watch",
+    "build:rollup:watch": "rollup -c rollup.npm.config.js --watch",
+    "build:types:watch": "tsc -p tsconfig.types.json --watch",
+    "build:npm": "ts-node ../../scripts/prepack.ts && npm pack ./build",
+    "circularDepCheck": "madge --circular src/index.ts",
+    "clean": "rimraf build coverage cjs esm sentry-dev-utils-*.tgz",
+    "fix": "run-s fix:eslint fix:prettier",
+    "fix:eslint": "eslint . --format stylish --fix",
+    "fix:prettier": "prettier --write \"{src,test,scripts}/**/*.ts\"",
+    "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\"",
+    "test": "jest",
+    "test:watch": "jest --watch"
+  },
+  "volta": {
+    "extends": "../../package.json"
+  },
+  "sideEffects": false
+}
diff --git a/packages/dev-utils/rollup.npm.config.js b/packages/dev-utils/rollup.npm.config.js
new file mode 100644
index 000000000000..0d46ab9a3b96
--- /dev/null
+++ b/packages/dev-utils/rollup.npm.config.js
@@ -0,0 +1,8 @@
+import { makeBaseNPMConfig, makeNPMConfigVariants } from '../../rollup/index.js';
+
+export default makeNPMConfigVariants(
+  makeBaseNPMConfig({
+    // This way we don't have to worry about whether third-party packages have updated to ESM yet.
+    esModuleInterop: true,
+  }),
+);
diff --git a/packages/dev-utils/src/index.ts b/packages/dev-utils/src/index.ts
new file mode 100644
index 000000000000..086116d17372
--- /dev/null
+++ b/packages/dev-utils/src/index.ts
@@ -0,0 +1,2 @@
+// we need some import or export to exist, to satisfy the tsconfig --isolatedModules setting
+export const dummyExport = {};
diff --git a/packages/dev-utils/test/placeholder.test.ts b/packages/dev-utils/test/placeholder.test.ts
new file mode 100644
index 000000000000..72ed048e9d5f
--- /dev/null
+++ b/packages/dev-utils/test/placeholder.test.ts
@@ -0,0 +1,8 @@
+// we need some import or export to exist, to satisfy the tsconfig --isolatedModules setting
+import { dummyExport } from '../src';
+
+describe('placeholder tests', () => {
+  it('holds a place', () => {
+    expect(dummyExport).toEqual({});
+  });
+});
diff --git a/packages/dev-utils/tsconfig.json b/packages/dev-utils/tsconfig.json
new file mode 100644
index 000000000000..bf45a09f2d71
--- /dev/null
+++ b/packages/dev-utils/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+
+  "include": ["src/**/*"],
+
+  "compilerOptions": {
+    // package-specific options
+  }
+}
diff --git a/packages/dev-utils/tsconfig.test.json b/packages/dev-utils/tsconfig.test.json
new file mode 100644
index 000000000000..7e1c06749f7d
--- /dev/null
+++ b/packages/dev-utils/tsconfig.test.json
@@ -0,0 +1,20 @@
+{
+  "extends": "./tsconfig.json",
+
+  "include": ["test/**/*"],
+
+  "compilerOptions": {
+    // should include all types from `./tsconfig.json` plus types for all test frameworks used
+    "types": ["node", "jest"],
+
+    // other package-specific, test-specific options
+
+    // `es2020` is the recommended `lib` and `target` for Node 14
+    // see https://github.com/tsconfig/bases/blob/main/bases/node14.json
+    "lib": ["dom", "es2020"],
+    "target": "es2020",
+
+    // so we don't have to worry about how libraries we use export things
+    "esModuleInterop": true
+  }
+}
diff --git a/packages/dev-utils/tsconfig.types.json b/packages/dev-utils/tsconfig.types.json
new file mode 100644
index 000000000000..65455f66bd75
--- /dev/null
+++ b/packages/dev-utils/tsconfig.types.json
@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+
+  "compilerOptions": {
+    "declaration": true,
+    "declarationMap": true,
+    "emitDeclarationOnly": true,
+    "outDir": "build/types"
+  }
+}