include commonjs version in bundled package

Added support for both ESM and CommonJS module formats in the @kubernetes/client-node package. Created tsconfig.cjs.json and tsconfig.esm.json to manage outputs. This change optimizes performance for testing frameworks such as jest that still rely on commonjs

Author: lucavb

package.json

@@ -8,21 +8,27 @@
         "url": "https://github.com/kubernetes-client/javascript.git"
     },
     "files": [
-        "dist/*.ts",
-        "dist/*.js",
-        "dist/gen/*.ts",
-        "dist/gen/*.js",
-        "dist/gen/**/*.ts",
-        "dist/gen/**/*.js",
+        "dist/{mjs,cjs}/*.ts",
+        "dist/{mjs,cjs}/*.js",
+        "dist/{mjs,cjs}/gen/*.ts",
+        "dist/{mjs,cjs}/gen/*.js",
+        "dist/{mjs,cjs}/gen/**/*.ts",
+        "dist/{mjs,cjs}/gen/**/*.js",
         "README.md"
     ],
-    "main": "dist/index.js",
-    "types": "dist/index.d.ts",
+    "main": "dist/mjs/index.js",
+    "types": "dist/mjs/index.d.ts",
+    "exports": {
+        ".": {
+            "require": "./dist/cjs/index.js",
+            "import": "./dist/esm/index.js"
+        }
+    },
     "scripts": {
         "format": "prettier --log-level error --write \"./src/**/*.ts\"",
         "lint": "eslint \".\" && prettier --check \"./src/**/*.ts\"",
         "clean": "rm -Rf node_modules/ dist/",
-        "build": "tsc",
+        "build": "tsc -p tsconfig.esm.json && tsc -p tsconfig.cjs.json",
         "build-with-tests": "tsc --project tsconfig-with-tests.json && cp 'src/test/echo space.js' dist/test",
         "generate": "./generate-client.sh",
         "watch": "tsc --watch",

tsconfig.cjs.json

@@ -0,0 +1,10 @@
+{
+    "compilerOptions": {
+        "module": "CommonJS",
+        "moduleResolution": "node",
+        "outDir": "dist/cjs"
+    },
+    "exclude": ["node_modules", "src/*_test.ts", "src/test", "dist"],
+    "extends": "./tsconfig.json",
+    "include": ["*.ts", "src/**/*"]
+}

tsconfig.esm.json

@@ -0,0 +1,8 @@
+{
+    "compilerOptions": {
+        "outDir": "dist/mjs"
+    },
+    "exclude": ["node_modules", "src/*_test.ts", "src/test", "dist"],
+    "extends": "./tsconfig.json",
+    "include": ["*.ts", "src/**/*"]
+}

tsconfig.json

@@ -20,5 +20,16 @@
         // "declarationMap": true
     },
     "exclude": ["node_modules", "src/*_test.ts", "src/test", "dist"],
-    "include": ["*.ts", "src/**/*"]
+    "include": ["*.ts", "src/**/*"],
+    "reference": [
+        {
+            "path": "tsconfig.cjs.json"
+        },
+        {
+            "path": "tsconfig.mjs.json"
+        },
+        {
+            "path": "tsconfig-with-tests.json"
+        }
+    ]
 }