Configure Vite to build the SDK

.gitignore

@@ -17,8 +17,8 @@
 
 # production
 /storybook-static
-/build
 /dist
+/dist-vite
 /lib
 /esm
 *.tgz

build/plugins.mts

@@ -0,0 +1,35 @@
+import lodashTemplate from 'lodash/template';
+
+// inspired on https://dev.to/koistya/using-ejs-with-vite-48id and
+// https://github.com/difelice/ejs-loader/blob/master/index.js
+export const ejsPlugin = () => ({
+  name: 'compile-ejs',
+  async transform(src: string, id: string) {
+    const options = {
+      variable: 'ctx',
+      evaluate: /\{%([\s\S]+?)%\}/g,
+      interpolate: /\{\{([\s\S]+?)\}\}/g,
+      escape: /\{\{\{([\s\S]+?)\}\}\}/g,
+    };
+    if (id.endsWith('.ejs')) {
+      // @ts-ignore
+      const code = lodashTemplate(src, options);
+      return {code: `export default ${code}`, map: null};
+    }
+  },
+});
+
+export const cjsTokens = () => ({
+  name: 'process-cjs-tokens',
+  async transform(src, id) {
+    if (
+      id.endsWith('/design-tokens/dist/tokens.js') ||
+      id.endsWith('node_modules/@utrecht/design-tokens/dist/tokens.cjs')
+    ) {
+      return {
+        code: src.replace('module.exports = ', 'export default '),
+        map: null,
+      };
+    }
+  },
+});

build/utils.mts

@@ -0,0 +1,15 @@
+import {dependencies, peerDependencies} from '../package.json';
+
+const externalPackages = [
+  ...Object.keys(dependencies || {}),
+  ...Object.keys(peerDependencies || {}),
+  'formiojs',
+  'lodash',
+  '@formio/vanilla-text-mask',
+  '@babel/runtime',
+  '@utrecht/component-library-react',
+];
+
+// Creating regexes of the packages to make sure subpaths of the
+// packages are also treated as external
+export const packageRegexes = externalPackages.map(packageName => new RegExp(`^${packageName}(/.*)?`));

package.json

@@ -70,6 +70,7 @@
     "start": "npm run build:design-tokens && node scripts/start.js",
     "build": "node scripts/build.js && npm run build:esm",
     "build:esm": "rimraf dist/esm && NODE_ENV=production babel --no-babelrc --config-file ./.babelrc.esm-build --ignore 'src/**/*.spec.js','src/**/fixtures/**','src/setupTests.js','src/reportWebVitals.js' src --out-dir dist/esm",
+    "build:vite": "BUILD_TARGET=umd vite build && BUILD_TARGET=esm vite build",
     "test": "TZ=Europe/Amsterdam vitest",
     "test:storybook": "test-storybook --coverage",
     "clean": "rimraf dist/*",

src/formio/components/Number.js

@@ -1,5 +1,5 @@
 import {maskInput} from '@formio/vanilla-text-mask';
-import {set} from 'lodash';
+import set from 'lodash/set';
 import {Formio} from 'react-formio';
 
 import {setErrorAttributes} from '../utils';

src/formio/validators/plugins.js

@@ -1,4 +1,4 @@
-import {isEmpty} from 'lodash';
+import isEmpty from 'lodash/isEmpty';
 
 import {post} from '../../api';
 

src/sdk.jsx

@@ -1,5 +1,6 @@
 import ProtectedEval from '@formio/protected-eval';
 import 'flatpickr';
+import lodash from 'lodash';
 import {fixIconUrls as fixLeafletIconUrls} from 'map';
 import React from 'react';
 import {createRoot} from 'react-dom/client';
@@ -23,6 +24,11 @@ import OpenFormsModule from './formio/module';
 import OFLibrary from './formio/templates';
 import './styles.scss';
 
+// lodash must be bundled for Formio templates to work properly...
+if (typeof window !== 'undefined') {
+  window._ = lodash;
+}
+
 // use protected eval to not rely on unsafe-eval (CSP)
 Formio.use(ProtectedEval);
 

vite.config.mts

@@ -1,44 +1,69 @@
 /// <reference types="vitest/config" />
 // https://vitejs.dev/config/
 import react from '@vitejs/plugin-react';
-import lodashTemplate from 'lodash/template';
+import type {OutputOptions} from 'rollup';
 import {defineConfig} from 'vite';
 import jsconfigPaths from 'vite-jsconfig-paths';
 import {coverageConfigDefaults} from 'vitest/config';
 
-// inspired on https://dev.to/koistya/using-ejs-with-vite-48id and
-// https://github.com/difelice/ejs-loader/blob/master/index.js
-const ejsPlugin = () => ({
-  name: 'compile-ejs',
-  async transform(src: string, id: string) {
-    const options = {
-      variable: 'ctx',
-      evaluate: /\{%([\s\S]+?)%\}/g,
-      interpolate: /\{\{([\s\S]+?)\}\}/g,
-      escape: /\{\{\{([\s\S]+?)\}\}\}/g,
-    };
-    if (id.endsWith('.ejs')) {
-      // @ts-ignore
-      const code = lodashTemplate(src, options);
-      return {code: `export default ${code}`, map: null};
+import {cjsTokens, ejsPlugin} from './build/plugins.mjs';
+import {packageRegexes} from './build/utils.mjs';
+
+// type definition for our custom envvars
+declare global {
+  namespace NodeJS {
+    interface ProcessEnv {
+      BUILD_TARGET: 'umd' | 'esm';
+    }
+  }
+}
+
+const buildTarget = process.env.BUILD_TARGET || 'umd';
+
+/**
+ * Rollup output options for ESM build, which is what we package in the NPM package
+ * under the 'esm' subdirectory.
+ *
+ * The ESM package is experimental. Known issues:
+ * @fixme
+ *
+ * - the react-intl translations are not distributed yet (also broken in CRA/babel build!)
+ */
+const esmOutput = {
+  dir: 'dist-vite/esm',
+  format: 'esm',
+  preserveModules: true,
+  preserveModulesRoot: 'src',
+  entryFileNames: '[name].js',
+  assetFileNames: ({name}) => {
+    if (name?.endsWith('.css')) {
+      return '[name].[ext]';
     }
+    return 'static/media/[name].[hash:8].[ext]';
   },
-});
+} satisfies OutputOptions;
 
-const cjsTokens = () => ({
-  name: 'process-cjs-tokens',
-  async transform(src, id) {
-    if (
-      id.endsWith('/design-tokens/dist/tokens.js') ||
-      id.endsWith('node_modules/@utrecht/design-tokens/dist/tokens.cjs')
-    ) {
-      return {
-        code: src.replace('module.exports = ', 'export default '),
-        map: null,
-      };
+/**
+ * Rollup output options for UMD bundle, included in the NPM package but
+ * the primary distribution mechanism is in a Docker image.
+ *
+ * @todo - optimize with bundle splitting/chunk management.
+ */
+const umdOutput = {
+  dir: 'dist-vite',
+  format: 'umd',
+  exports: 'named',
+  name: 'OpenForms',
+  generatedCode: 'es2015',
+  entryFileNames: 'open-forms-sdk.js',
+  assetFileNames: ({name}) => {
+    if (name === 'style.css') {
+      return 'open-forms-sdk.css';
     }
+    return 'static/media/[name].[hash:8].[ext]';
   },
-});
+  inlineDynamicImports: true,
+} satisfies OutputOptions;
 
 export default defineConfig({
   base: './',
@@ -54,6 +79,20 @@ export default defineConfig({
     cjsTokens(),
     ejsPlugin(),
   ],
+  build: {
+    target: 'modules', // the default
+    assetsInlineLimit: 8 * 1024, // 8 KiB
+    cssCodeSplit: false,
+    sourcemap: buildTarget !== 'esm',
+    outDir: 'dist-vite/umd',
+    rollupOptions: {
+      input: 'src/sdk.jsx',
+      // do not externalize anything in UMD build - bundle everything
+      external: buildTarget === 'esm' ? packageRegexes : undefined,
+      output: buildTarget === 'esm' ? esmOutput : umdOutput,
+      preserveEntrySignatures: 'strict',
+    },
+  },
   css: {
     preprocessorOptions: {
       scss: {