Add missing vendors file after r58271.

See #61324.



git-svn-id: https://develop.svn.wordpress.org/trunk@58273 602fd350-edb4-49c9-b593-d223f7449a82

tools/webpack/vendors.js

@@ -0,0 +1,58 @@
+/**
+ * External dependencies
+ */
+const { join } = require( 'path' );
+
+const importedVendors = {
+	react: { import: 'react', global: 'React' },
+	'react-dom': { import: 'react-dom', global: 'ReactDOM' },
+	'react-jsx-runtime': {
+		import: 'react/jsx-runtime',
+		global: 'ReactJSXRuntime',
+	},
+};
+
+module.exports = function (
+	env = { environment: 'production', watch: false, buildTarget: false }
+) {
+	const mode = env.environment;
+	let buildTarget = env.buildTarget
+		? env.buildTarget
+		: mode === 'production'
+		? 'build'
+		: 'src';
+    buildTarget = buildTarget + '/wp-includes/js/dist/vendor/';
+	return [
+		...Object.entries( importedVendors ).flatMap( ( [ name, config ] ) => {
+			return [ 'production', 'development' ].map( ( currentMode ) => {
+				return {
+					mode: currentMode,
+					target: 'browserslist',
+					output: {
+						filename:
+							currentMode === 'development'
+								? `[name].js`
+								: `[name].min.js`,
+						path: join( __dirname, '..', '..', buildTarget ),
+					},
+					entry: {
+						[ name ]: {
+							import: config.import,
+							library: {
+								name: config.global,
+								type: 'window',
+							},
+						},
+					},
+
+					externals:
+						name === 'react'
+							? {}
+							: {
+									react: 'React',
+							  },
+				};
+			} );
+		} ),
+	];
+};