Add rollup config.

Author: rickypc

rollup.config.js

@@ -0,0 +1,143 @@
+/* rollup.config.js - Rollup configuration.
+ * Copyright (c) 2019 - 2021  Richard Huang <rickypc@users.noreply.github.com>
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import babel from '@rollup/plugin-babel';
+import copy from 'rollup-plugin-copy';
+import del from 'rollup-plugin-delete';
+import fs from 'fs';
+import path from 'path';
+import { terser } from 'rollup-plugin-terser';
+import pkg from './package.json';
+
+const banner = `/*! ${pkg.name} v${pkg.version} | (c) ${pkg.author.name} <${pkg.author.email}> | ${pkg.license} */`;
+const external = [
+  'react',
+  'react/jsx-runtime',
+];
+const globals = {
+  react: 'React',
+  'react/jsx-runtime': 'jsxRuntime',
+};
+const input = ['./src/index.js'];
+const writePackage = (json, to) => ({
+  generateBundle() {
+    const {
+      devDependencies,
+      eslintConfig,
+      jest,
+      scripts,
+      ...output
+    } = json;
+    delete output.babel;
+    fs.writeFileSync(path.resolve(to), JSON.stringify(output));
+  },
+  name: 'write-package',
+});
+
+export default [
+  // CJS and ESM.
+  {
+    external,
+    input,
+    onwarn: (warning, next) => {
+      if (warning.code === 'UNUSED_EXTERNAL_IMPORT') return;
+      next(warning);
+    },
+    output: [
+      {
+        banner,
+        exports: 'named',
+        file: `dist/${pkg.main}`,
+        format: 'cjs',
+        globals,
+        sourcemap: true,
+        strict: false,
+      },
+      {
+        banner,
+        exports: 'named',
+        file: `dist/${pkg.module}`,
+        format: 'esm',
+        globals,
+        sourcemap: true,
+        strict: false,
+      },
+    ],
+    plugins: [
+      // Begin run once.
+      del({
+        targets: 'dist/*',
+      }),
+      copy({
+        targets: [
+          { src: ['example.js', 'README.md'], dest: 'dist' },
+        ],
+      }),
+      writePackage(pkg, 'dist/package.json'),
+      // End run once.
+      babel({
+        babelrc: false,
+        babelHelpers: 'bundled',
+        exclude: 'node_modules/**',
+        presets: [
+          '@babel/flow',
+          [
+            '@babel/react',
+            {
+              runtime: 'automatic',
+            },
+          ],
+        ],
+      }),
+      terser({
+        compress: false,
+        mangle: false,
+      }),
+    ],
+  },
+  // UMD.
+  {
+    external,
+    input,
+    output: [
+      {
+        banner,
+        esModule: false,
+        exports: 'named',
+        file: 'dist/index.umd.js',
+        format: 'umd',
+        globals,
+        name: 'reactStoreContextHooks',
+        sourcemap: true,
+      },
+    ],
+    plugins: [
+      babel({
+        babelrc: false,
+        babelHelpers: 'bundled',
+        exclude: 'node_modules/**',
+        presets: [
+          [
+            '@babel/preset-env',
+            {
+              exclude: ['transform-typeof-symbol'],
+              targets: {
+                browsers: [
+                  'last 2 versions',
+                  '> 5%',
+                ],
+              },
+            },
+          ],
+          '@babel/flow',
+          '@babel/react',
+        ],
+      }),
+      terser(),
+    ],
+  },
+];