Enable jest multi-root

1. Jest requires CJS exported module from interface.
2. Jest startup is quite slow :(
3. Made a workspace at the root to develop this package set.

Author: alexrecuenco

.vscode/settings.json

@@ -23,7 +23,6 @@
         "editor.tabSize": 4,
     },
     "eslint.useFlatConfig": true,
-    "jest.enable": true,
-    "jest.rootPath": "packages/",
+    "jest.enable": false,
     "vite.autoStart": false,
 }

package.cjs-template.json

@@ -0,0 +1,5 @@
+{
+    "//": "See fast-check for example of exporting both CJS and ESM. https://github.com/dubzzz/fast-check/blob/main/packages/vitest/package.json",
+    "type": "commonjs",
+    "sideEffects": false
+}

package.json

@@ -14,8 +14,8 @@
     "private": "true",
     "workspaces": [
         "packages/interface",
-        "packages/backend",
-        "packages/frontend"
+        "packages/frontend",
+        "packages/backend"
     ],
     "scripts": {
         "dev": "concurrently -k -n backend,frontend -c magenta,blue \"npm run dev -w backend\" \"npm run dev -w frontend\"",

packages/backend/.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "jest.enable": true
+}

packages/backend/jest.config.ts

@@ -13,7 +13,15 @@ const pathAliases = {
   [packageJson.name]: ['src'],
 };
 
-// See here for more info https://kulshekhar.github.io/ts-jest/docs/getting-started/presets/#advanced
+/**
+ * To get this to work for importing external ESM modules (i.e., interface being
+ * solely ESM, ) You currently need to run NODE_OPTIONS="$NODE_OPTIONS
+ * --experimental-vm-modules" npm test See
+ * https://jestjs.io/docs/ecmascript-modules Tracking jest issue
+ * https://github.com/jestjs/jest/issues/9430 See here for more presets
+ * https://kulshekhar.github.io/ts-jest/docs/getting-started/presets/#advanced
+ */
+
 const preset = createDefaultEsmPreset({
   tsconfig: './tsconfig.test.json',
 });

packages/backend/jest.setup.ts

@@ -3,6 +3,7 @@
  * https://github.com/dubzzz/fast-check/blob/1ceb2b982b754b99aef8d763723206605b67451e/example/jest.setup.js
  */
 
+import { jest } from '@jest/globals';
 import fc from 'fast-check';
 
 // Default timeout of 60s

packages/backend/package.json

@@ -1,5 +1,6 @@
 {
     "name": "backend",
+    "private": true,
     "version": "1.0.0",
     "main": "dist/src/index.js",
     "type": "module",

packages/backend/tsconfig.test.json

@@ -1,5 +1,5 @@
 {
-    "extends": "./tsconfig.json",
+    "extends": "./tsconfig.node.json",
     "compilerOptions": {
         "outDir": "./build-test",
         "types": ["node", "jest"],

packages/interface/package.json

@@ -9,6 +9,10 @@
             "import": {
                 "default": "./dist/src/index.js",
                 "types": "./dist/src/index.d.ts"
+            },
+            "require": {
+                "default": "./dist/cjs/src/index.js",
+                "types": "./dist/cjs/src/index.d.ts"
             }
         }
     },
@@ -18,7 +22,9 @@
     "description": "Interface between frontend and backend",
     "scripts": {
         "test": "tsc --build ./tsconfig.test.json",
-        "build": "tsc --build ./tsconfig.prod.json"
+        "build": "npm run build:prod:esm && npm run build:prod:cjs",
+        "build:prod:esm": "tsc --build tsconfig.esm.json",
+        "build:prod:cjs": "tsc --build tsconfig.cjs.json && cp ../../package.cjs-template.json dist/cjs/package.json"
     },
     "author": "Alex Recuenco",
     "license": "MIT",

packages/interface/tsconfig.cjs.json

@@ -0,0 +1,8 @@
+{
+    "extends": "./tsconfig.esm.json",
+    "compilerOptions": {
+        "outDir": "./dist/cjs",
+        "module": "CommonJS",
+        "moduleResolution": null,
+    },
+}