first commit

backend/lib/backend-lib.mjs

@@ -0,0 +1,3 @@
+export function backend() {
+  return 'backend';
+}

backend/package.json

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+{
+  "name": "backend",
+  "version": "1.0.0",
+  "scripts": {
+    "test": "jest"
+  },
+  "devDependencies": {
+    "babel-plugin-transform-es2015-modules-commonjs": "^6.26.2",
+    "jest": "^24.5.0"
+  },
+  "jest": {
+    "testEnvironment": "node",
+    "testMatch": [
+      "**/?(*.)(spec|test).?(m)js?(x)"
+    ],
+    "moduleFileExtensions": [
+      "js",
+      "mjs"
+    ],
+    "transform": {
+      "^.+\\.m?js$": "babel-jest"
+    }
+  },
+  "babel": {
+    "env": {
+      "test": {
+        "plugins": [
+          "transform-es2015-modules-commonjs"
+        ]
+      }
+    }
+  }
+}

backend/use-backend-lib.test.mjs

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+// Works fine
+
+import { backend } from './lib/backend-lib';
+
+test('test using backend library', () => {
+  expect(backend()).toBeTruthy();
+});

backend/use-project-lib.test.mjs

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+// Jest encountered an unexpected token
+
+import { foo } from '../lib/project-lib';
+
+test('test using project-level library', () => {
+  expect(foo()).toBeTruthy();
+});

lib/project-lib.mjs

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+export function foo() {
+  return 'foo';
+}