Build generate-umd as well

package.json

@@ -44,6 +44,7 @@
     "np": "^6.2.3",
     "prettier": "^2.0.2",
     "rollup": "^2.9.0",
+    "rollup-plugin-node-builtins": "^2.1.2",
     "typescript": "^3.8.3"
   },
   "husky": {

rollup.config.js

@@ -1,30 +1,52 @@
 import commonjs from "@rollup/plugin-commonjs";
 import resolve from "@rollup/plugin-node-resolve";
 import babel from "@rollup/plugin-babel";
+import builtins from "rollup-plugin-node-builtins";
 
 const extensions = [".ts", ".js", ".json"];
 
-export default {
-  input: "src/cli.ts",
-  output: [
-    {
+export default [
+  // cjs
+  {
+    input: "src/cli.ts",
+    output: {
       dir: "build",
       format: "cjs",
     },
-  ],
-  plugins: [
-    babel({ babelHelpers: "bundled", extensions }),
-    resolve({ extensions, rootDir: "src" }),
-    commonjs({ extensions }),
-  ],
-  external: [
-    /node_modules/,
-    "graphql",
-    "glob",
-    "@oclif/command",
-    "@graphql-toolkit/graphql-tag-pluck",
-    "lodash",
-    "prettier",
-    "@oclif/errors/handle",
-  ],
-};
+    plugins: [
+      babel({ babelHelpers: "bundled", extensions }),
+      resolve({ extensions, rootDir: "src" }),
+      commonjs({ extensions }),
+    ],
+    // Prevent rollup from including node_modules
+    // I don't feel like including every package explicitly is the right way
+    // to do this, but it works for now
+    external: [
+      /node_modules/,
+      "graphql",
+      "glob",
+      "@oclif/command",
+      "@graphql-toolkit/graphql-tag-pluck",
+      "lodash/capitalize",
+      "lodash/flatMap",
+      "lodash/uniq",
+      "prettier",
+      "@oclif/errors/handle",
+    ],
+  },
+  // UMD for demo web page
+  {
+    input: "src/generate.ts",
+    output: {
+      file: "build/generate-umd.js",
+      format: "umd",
+      name: "ts-graphql-gen",
+    },
+    plugins: [
+      babel({ babelHelpers: "bundled", extensions }),
+      resolve({ extensions, rootDir: "src" }),
+      commonjs({ extensions }),
+      builtins(),
+    ],
+  },
+];

src/generate.ts

@@ -17,7 +17,8 @@ import {
   SelectionSetNode,
   GraphQLError,
 } from "graphql";
-import { capitalize, flatMap } from "lodash";
+import capitalize from "lodash/capitalize";
+import flatMap from "lodash/flatMap";
 
 import {
   Document,

src/print.ts

@@ -1,5 +1,5 @@
 import { EOL } from "os";
-import { uniq } from "lodash";
+import uniq from "lodash/uniq";
 
 import {
   SchemaTypeSummary,