First commit

Author: Robin Genske

package-lock.json

@@ -0,0 +1,28 @@
+{
+  "name": "jest-esm-test",
+  "version": "1.0.0",
+  "description": "",
+  "main": "src/index.js",
+  "scripts": {
+    "start": "node .",
+    "lint": "eslint .",
+    "test": "NODE_OPTIONS='--experimental-vm-modules' jest"
+  },
+  "author": "Robin",
+  "license": "UNLICENSED",
+  "dependencies": {
+    "config": "^3.3.6",
+    "pino": "^7.2.0",
+    "ws": "^8.2.3"
+  },
+  "type": "module",
+  "devDependencies": {
+    "eslint": "^8.2.0",
+    "eslint-config-airbnb-base": "^15.0.0",
+    "eslint-plugin-import": "^2.25.3",
+    "eslint-plugin-jest": "^25.2.4",
+    "jest": "^27.3.1",
+    "nodemon": "^2.0.15",
+    "pino-pretty": "^7.2.0"
+  }
+}

package.json

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+export const getCurrentState = () => {
+  return 5;
+}

src/a.js

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+import { getCurrentState } from './a.js'
+
+describe('a', () => {
+  describe('getCurrentState', () => {
+    it('it should return 5', () => {
+      expect(getCurrentState()).toBe(5);
+    })
+  })
+})

src/a.test.js

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+import { WebSocketServer } from 'ws'
+import { createServer } from 'https'
+
+export const getCurrentState = () => {
+  const server = createServer({})
+  const wss = new WebSocketServer({ server })
+
+  return 5
+}

src/b.js

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+import { getCurrentState } from './b.js'
+
+describe('b', () => {
+  describe('getCurrentState', () => {
+    it('it should return 5', () => {
+      expect(getCurrentState()).toBe(5);
+    })
+  })
+})

src/b.test.js

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+import { getCurrentState as aGetCurrentState } from './a.js'
+import { getCurrentState as bGetCurrentState } from './b.js'
+
+aGetCurrentState()
+bGetCurrentState()