diff --git a/.github/workflows/test-env.yml b/.github/workflows/test-env.yml
new file mode 100644
index 000000000..35a8940e5
--- /dev/null
+++ b/.github/workflows/test-env.yml
@@ -0,0 +1,44 @@
+name: Environment Tests
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+
+  test-env:
+    name: Test Environments
+
+    runs-on: ubuntu-latest
+
+    env:
+      npm_config_registry: http://localhost:8043
+
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [ "ts-import-cjs-node16", "ts-import-esm-node16", "ts-import-cjs", "ts-import-esm" ]
+
+    steps:
+      - name: Use Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 18.x
+
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          path: "faux_modules/ethers"
+
+      - name: Install and run Faux Registry
+        uses: ethers-io/hijack-npm-action
+
+      - name: Copy tests to working directory
+        run: cp faux-npm/ethers/testcases/test-env/${{ matrix.test }}/* .
+
+      - name: Install packages
+        run: npm install
+
+      - name: Run tests
+        run: npm test
diff --git a/testcases/test-env/.gitignore b/testcases/test-env/.gitignore
new file mode 100644
index 000000000..f8159af09
--- /dev/null
+++ b/testcases/test-env/.gitignore
@@ -0,0 +1,2 @@
+*/node_modules/**
+*/pacakge-lock.json
diff --git a/testcases/test-env/ts-import-cjs-node16/.gitignore b/testcases/test-env/ts-import-cjs-node16/.gitignore
new file mode 100644
index 000000000..a358b8e00
--- /dev/null
+++ b/testcases/test-env/ts-import-cjs-node16/.gitignore
@@ -0,0 +1,2 @@
+index.d.ts
+index.js
diff --git a/testcases/test-env/ts-import-cjs-node16/index.ts b/testcases/test-env/ts-import-cjs-node16/index.ts
new file mode 100644
index 000000000..9c33b08f0
--- /dev/null
+++ b/testcases/test-env/ts-import-cjs-node16/index.ts
@@ -0,0 +1,5 @@
+import { ethers } from "ethers";
+
+console.log("Version:", ethers.version);
+
+console.log(ethers.getAddress("0x0123456789abcdef0123456789abcdef01234567"));
diff --git a/testcases/test-env/ts-import-cjs-node16/package.json b/testcases/test-env/ts-import-cjs-node16/package.json
new file mode 100644
index 000000000..74876a303
--- /dev/null
+++ b/testcases/test-env/ts-import-cjs-node16/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "test",
+  "dependencies": {
+    "ethers": "^6.0.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "version": "0.0.1",
+  "description": "Test case for simple import for ethers.",
+  "main": "index.js",
+  "private": true,
+  "publishConfig": { "access": "private" },
+  "scripts": {
+    "build": "tsc --project tsconfig.json",
+    "test": "npm run build && node index.js"
+  },
+  "license": "MIT"
+}
diff --git a/testcases/test-env/ts-import-cjs-node16/tsconfig.json b/testcases/test-env/ts-import-cjs-node16/tsconfig.json
new file mode 100644
index 000000000..1ec02a581
--- /dev/null
+++ b/testcases/test-env/ts-import-cjs-node16/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "declaration": true,
+    "importHelpers": false,
+    "lib": [
+      "dom",
+      "es2020",
+      "es5"
+    ],
+    "module": "es2020",
+    "moduleResolution": "node16",
+    "strict": true,
+    "target": "es2022"
+  },
+  "exclude": [ ],
+  "include": [
+    "./index.ts"
+  ],
+}
diff --git a/testcases/test-env/ts-import-cjs/.gitignore b/testcases/test-env/ts-import-cjs/.gitignore
new file mode 100644
index 000000000..a358b8e00
--- /dev/null
+++ b/testcases/test-env/ts-import-cjs/.gitignore
@@ -0,0 +1,2 @@
+index.d.ts
+index.js
diff --git a/testcases/test-env/ts-import-cjs/index.ts b/testcases/test-env/ts-import-cjs/index.ts
new file mode 100644
index 000000000..9c33b08f0
--- /dev/null
+++ b/testcases/test-env/ts-import-cjs/index.ts
@@ -0,0 +1,5 @@
+import { ethers } from "ethers";
+
+console.log("Version:", ethers.version);
+
+console.log(ethers.getAddress("0x0123456789abcdef0123456789abcdef01234567"));
diff --git a/testcases/test-env/ts-import-cjs/package.json b/testcases/test-env/ts-import-cjs/package.json
new file mode 100644
index 000000000..74876a303
--- /dev/null
+++ b/testcases/test-env/ts-import-cjs/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "test",
+  "dependencies": {
+    "ethers": "^6.0.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "version": "0.0.1",
+  "description": "Test case for simple import for ethers.",
+  "main": "index.js",
+  "private": true,
+  "publishConfig": { "access": "private" },
+  "scripts": {
+    "build": "tsc --project tsconfig.json",
+    "test": "npm run build && node index.js"
+  },
+  "license": "MIT"
+}
diff --git a/testcases/test-env/ts-import-cjs/tsconfig.json b/testcases/test-env/ts-import-cjs/tsconfig.json
new file mode 100644
index 000000000..cf90c7550
--- /dev/null
+++ b/testcases/test-env/ts-import-cjs/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "declaration": true,
+    "importHelpers": false,
+    "lib": [
+      "dom",
+      "es2020",
+      "es5"
+    ],
+    "module": "es2020",
+    "moduleResolution": "node",
+    "strict": true,
+    "target": "es2022"
+  },
+  "exclude": [ ],
+  "include": [
+    "./index.ts"
+  ],
+}
diff --git a/testcases/test-env/ts-import-esm-node16/.gitignore b/testcases/test-env/ts-import-esm-node16/.gitignore
new file mode 100644
index 000000000..a358b8e00
--- /dev/null
+++ b/testcases/test-env/ts-import-esm-node16/.gitignore
@@ -0,0 +1,2 @@
+index.d.ts
+index.js
diff --git a/testcases/test-env/ts-import-esm-node16/index.ts b/testcases/test-env/ts-import-esm-node16/index.ts
new file mode 100644
index 000000000..9c33b08f0
--- /dev/null
+++ b/testcases/test-env/ts-import-esm-node16/index.ts
@@ -0,0 +1,5 @@
+import { ethers } from "ethers";
+
+console.log("Version:", ethers.version);
+
+console.log(ethers.getAddress("0x0123456789abcdef0123456789abcdef01234567"));
diff --git a/testcases/test-env/ts-import-esm-node16/package.json b/testcases/test-env/ts-import-esm-node16/package.json
new file mode 100644
index 000000000..a6968c744
--- /dev/null
+++ b/testcases/test-env/ts-import-esm-node16/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "test",
+  "dependencies": {
+    "ethers": "^6.0.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "version": "0.0.1",
+  "description": "Test case for simple import for ethers.",
+  "main": "index.js",
+  "private": true,
+  "publishConfig": {
+    "access": "private"
+  },
+  "type": "module",
+  "scripts": {
+    "build": "tsc --project tsconfig.json",
+    "test": "npm run build && node index.js"
+  },
+  "keywords": [
+    "ethers",
+    "tests",
+    "typescipt"
+  ],
+  "author": "Richard Moore <me@ricmoo.com>",
+  "license": "MIT"
+}
diff --git a/testcases/test-env/ts-import-esm-node16/tsconfig.json b/testcases/test-env/ts-import-esm-node16/tsconfig.json
new file mode 100644
index 000000000..1ec02a581
--- /dev/null
+++ b/testcases/test-env/ts-import-esm-node16/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "declaration": true,
+    "importHelpers": false,
+    "lib": [
+      "dom",
+      "es2020",
+      "es5"
+    ],
+    "module": "es2020",
+    "moduleResolution": "node16",
+    "strict": true,
+    "target": "es2022"
+  },
+  "exclude": [ ],
+  "include": [
+    "./index.ts"
+  ],
+}
diff --git a/testcases/test-env/ts-import-esm/.gitignore b/testcases/test-env/ts-import-esm/.gitignore
new file mode 100644
index 000000000..a358b8e00
--- /dev/null
+++ b/testcases/test-env/ts-import-esm/.gitignore
@@ -0,0 +1,2 @@
+index.d.ts
+index.js
diff --git a/testcases/test-env/ts-import-esm/index.ts b/testcases/test-env/ts-import-esm/index.ts
new file mode 100644
index 000000000..9c33b08f0
--- /dev/null
+++ b/testcases/test-env/ts-import-esm/index.ts
@@ -0,0 +1,5 @@
+import { ethers } from "ethers";
+
+console.log("Version:", ethers.version);
+
+console.log(ethers.getAddress("0x0123456789abcdef0123456789abcdef01234567"));
diff --git a/testcases/test-env/ts-import-esm/package.json b/testcases/test-env/ts-import-esm/package.json
new file mode 100644
index 000000000..a6968c744
--- /dev/null
+++ b/testcases/test-env/ts-import-esm/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "test",
+  "dependencies": {
+    "ethers": "^6.0.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "version": "0.0.1",
+  "description": "Test case for simple import for ethers.",
+  "main": "index.js",
+  "private": true,
+  "publishConfig": {
+    "access": "private"
+  },
+  "type": "module",
+  "scripts": {
+    "build": "tsc --project tsconfig.json",
+    "test": "npm run build && node index.js"
+  },
+  "keywords": [
+    "ethers",
+    "tests",
+    "typescipt"
+  ],
+  "author": "Richard Moore <me@ricmoo.com>",
+  "license": "MIT"
+}
diff --git a/testcases/test-env/ts-import-esm/tsconfig.json b/testcases/test-env/ts-import-esm/tsconfig.json
new file mode 100644
index 000000000..cf90c7550
--- /dev/null
+++ b/testcases/test-env/ts-import-esm/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "declaration": true,
+    "importHelpers": false,
+    "lib": [
+      "dom",
+      "es2020",
+      "es5"
+    ],
+    "module": "es2020",
+    "moduleResolution": "node",
+    "strict": true,
+    "target": "es2022"
+  },
+  "exclude": [ ],
+  "include": [
+    "./index.ts"
+  ],
+}