Support cjs, esm and iife modules

web3.js/rollup.config.js

@@ -1,42 +1,76 @@
 import babel       from 'rollup-plugin-babel';
+import builtins    from 'rollup-plugin-node-builtins';
 import commonjs    from 'rollup-plugin-commonjs';
+import globals     from 'rollup-plugin-node-globals';
+import json        from 'rollup-plugin-json';
 import nodeResolve from 'rollup-plugin-node-resolve';
 import replace     from 'rollup-plugin-replace';
 import uglify      from 'rollup-plugin-uglify';
 
 const env = process.env.NODE_ENV;
 
-const config = {
-  input: 'src/index.js',
-  output: {
-    format: 'umd',
-    name: 'solanaWeb3',
-  },
+function generateConfig(configType) {
+  const config = {
+    input: 'src/index.js',
+    plugins: [
+      nodeResolve(),
+      babel({
+        exclude: '**/node_modules/**',
+        runtimeHelpers: true,
+      }),
+      replace({
+        'process.env.NODE_ENV': JSON.stringify(env),
+      }),
+      commonjs(),
+    ],
+  };
 
-  plugins: [
-    nodeResolve(),
-    babel({
-      exclude: '**/node_modules/**',
-      runtimeHelpers: true,
-    }),
-    replace({
-      'process.env.NODE_ENV': JSON.stringify(env),
-    }),
-    commonjs(),
-  ],
-};
+  if (env === 'production') {
+    config.plugins.push(
+      uglify({
+        compress: {
+          pure_getters: true,
+          unsafe: true,
+          unsafe_comps: true,
+          warnings: false,
+        },
+      }),
+    );
+  }
 
-if (env === 'production') {
-  config.plugins.push(
-    uglify({
-      compress: {
-        pure_getters: true,
-        unsafe: true,
-        unsafe_comps: true,
-        warnings: false,
+  switch (configType) {
+  case 'browser':
+    config.output = [
+      {
+        file: 'lib/index.iife.js',
+        format: 'iife',
+        name: 'solanaWeb3',
       },
-    }),
-  );
+    ];
+    config.plugins.unshift(json());
+    config.plugins.push(builtins());
+    config.plugins.push(globals());
+    break;
+  case 'node':
+    config.output = [
+      {
+        file: 'lib/index.cjs.js',
+        format: 'cjs',
+      },
+      {
+        file: 'lib/index.esm.js',
+        format: 'es',
+      },
+    ];
+    break;
+  default:
+    throw new Error(`Unknown configType: ${configType}`);
+  }
+
+  return config;
 }
 
-export default config;
+export default [
+  generateConfig('node'),
+  generateConfig('browser'),
+];