use the .cjs extension for CJS files

packages/rxjs/integration/import/fixtures/commonjs/package.json

@@ -2,9 +2,9 @@
   "name": "rxjs-import-test",
   "private": true,
   "version": "0.0.1",
-  "main": "./index.js",
+  "main": "./index.cjs",
   "scripts": {
-    "test": "node ./index.js"
+    "test": "node ./index.cjs"
   },
   "dependencies": {}
 }

packages/rxjs/integration/import/fixtures/webpack-bundle/package.json

@@ -3,7 +3,7 @@
   "private": true,
   "version": "0.0.1",
   "scripts": {
-    "test": "node ./test.js"
+    "test": "node ./test.cjs"
   },
   "dependencies": {
     "html-webpack-plugin": "^5.5.3",

packages/rxjs/integration/import/fixtures/webpack-bundle/test.js → packages/rxjs/integration/import/fixtures/webpack-bundle/test.cjs

@@ -1,7 +1,7 @@
 const puppeteer = require('puppeteer');
 const Webpack = require('webpack');
 const WebpackDevServer = require('webpack-dev-server');
-const webpackConfig = require('./webpack.config.js');
+const webpackConfig = require('./webpack.config.cjs');
 
 // const __filename = fileURLToPath(import.meta.url);
 // const __dirname = dirname(__filename);

packages/rxjs/package.json

@@ -61,13 +61,13 @@
   "scripts": {
     "lint": "eslint --ext=ts,js src spec spec-dtslint",
     "dtslint": "npm run lint && tsc -b ./src/tsconfig.types.json",
-    "test": "cross-env TS_NODE_PROJECT=tsconfig.mocha.json mocha --config spec/support/.mocharc.js \"spec/**/*-spec.ts\"",
+    "test": "cross-env TS_NODE_PROJECT=tsconfig.mocha.json mocha --config spec/support/.mocharc.cjs \"spec/**/*-spec.ts\"",
     "test:esm": "node spec/module-test-spec.mjs",
     "test:circular": "dependency-cruiser --validate .dependency-cruiser.json -x \"^node_modules\" dist/esm",
-    "test:import": "node integration/import/runner.js",
+    "test:import": "node integration/import/runner.cjs",
     "compile": "tsc -b ./src/tsconfig.cjs.json ./src/tsconfig.cjs.spec.json ./src/tsconfig.esm.json ./src/tsconfig.types.json ./src/tsconfig.types.spec.json ./spec/tsconfig.json",
     "build:clean": "shx rm -rf ./dist",
-    "build": "yarn build:clean && yarn compile && node ./tools/generate-alias.js",
+    "build": "yarn build:clean && yarn compile && node ./tools/generate-alias.cjs",
     "watch": "nodemon -w \"src/\" -w \"spec/\" -e ts -x npm test",
     "watch:dtslint": "nodemon -w \"src/\" -w \"spec-dtslint/\" -e ts -x yarn dtslint",
     "copy_common_package_files": "node ../../scripts/copy-common-package-files.js"