feat(clerk-js): Introduce legacy browser variant

.changeset/social-pandas-return.md

@@ -0,0 +1,5 @@
+---
+'@clerk/clerk-js': minor
+---
+
+Introduce `clerk.legacy.browser.js` for legacy browser support.

packages/clerk-js/bundlewatch.config.json

@@ -3,25 +3,25 @@
     { "path": "./dist/clerk.js", "maxSize": "593kB" },
     { "path": "./dist/clerk.browser.js", "maxSize": "74.2KB" },
     { "path": "./dist/clerk.headless*.js", "maxSize": "55KB" },
-    { "path": "./dist/ui-common*.js", "maxSize": "100KB" },
-    { "path": "./dist/vendors*.js", "maxSize": "36KB" },
-    { "path": "./dist/coinbase*.js", "maxSize": "35.5KB" },
+    { "path": "./dist/ui-common*.js", "maxSize": "102KB" },
+    { "path": "./dist/vendors*.js", "maxSize": "39KB" },
+    { "path": "./dist/coinbase*.js", "maxSize": "38KB" },
     { "path": "./dist/createorganization*.js", "maxSize": "5KB" },
     { "path": "./dist/impersonationfab*.js", "maxSize": "5KB" },
     { "path": "./dist/organizationprofile*.js", "maxSize": "12KB" },
     { "path": "./dist/organizationswitcher*.js", "maxSize": "5KB" },
     { "path": "./dist/organizationlist*.js", "maxSize": "5.5KB" },
-    { "path": "./dist/signin*.js", "maxSize": "12.5KB" },
+    { "path": "./dist/signin*.js", "maxSize": "14KB" },
     { "path": "./dist/signup*.js", "maxSize": "6.75KB" },
     { "path": "./dist/userbutton*.js", "maxSize": "5KB" },
     { "path": "./dist/userprofile*.js", "maxSize": "16KB" },
     { "path": "./dist/userverification*.js", "maxSize": "5KB" },
     { "path": "./dist/onetap*.js", "maxSize": "1KB" },
     { "path": "./dist/waitlist*.js", "maxSize": "1.3KB" },
-    { "path": "./dist/keylessPrompt*.js", "maxSize": "5.9KB" },
-    { "path": "./dist/pricingTable*.js", "maxSize": "5.28KB" },
+    { "path": "./dist/keylessPrompt*.js", "maxSize": "6.5KB" },
+    { "path": "./dist/pricingTable*.js", "maxSize": "5.5KB" },
     { "path": "./dist/checkout*.js", "maxSize": "3.05KB" },
-    { "path": "./dist/paymentSources*.js", "maxSize": "8.2KB" },
+    { "path": "./dist/paymentSources*.js", "maxSize": "8.5KB" },
     { "path": "./dist/up-billing-page*.js", "maxSize": "2.5KB" },
     { "path": "./dist/op-billing-page*.js", "maxSize": "2.5KB" },
     { "path": "./dist/sessionTasks*.js", "maxSize": "1KB" }

packages/clerk-js/package.json

@@ -52,7 +52,7 @@
     "test:coverage": "jest --collectCoverage && open coverage/lcov-report/index.html",
     "watch": "rspack build --config rspack.config.js --env production --watch"
   },
-  "browserslist": "last 2 years, Safari > 12, iOS > 12",
+  "browserslist": "last 2 years",
   "dependencies": {
     "@clerk/localizations": "workspace:^",
     "@clerk/shared": "workspace:^",
@@ -70,7 +70,7 @@
     "@zxcvbn-ts/language-common": "3.0.4",
     "browser-tabs-lock": "1.2.15",
     "copy-to-clipboard": "3.3.3",
-    "core-js": "3.26.1",
+    "core-js": "3.41.0",
     "crypto-js": "^4.2.0",
     "dequal": "2.0.3",
     "qrcode.react": "3.1.0",
@@ -94,5 +94,6 @@
   },
   "publishConfig": {
     "access": "public"
-  }
+  },
+  "browserslistLegacy": "Chrome > 73, Firefox > 66, Safari > 12, iOS > 12, Edge > 18, Opera > 58"
 }

packages/clerk-js/rspack.config.js

@@ -15,6 +15,7 @@ const variants = {
   clerkBrowser: 'clerk.browser',
   clerkHeadless: 'clerk.headless',
   clerkHeadlessBrowser: 'clerk.headless.browser',
+  clerkLegacyBrowser: 'clerk.legacy.browser',
 };
 
 const variantToSourceFile = {
@@ -23,16 +24,18 @@ const variantToSourceFile = {
   [variants.clerkBrowser]: './src/index.browser.ts',
   [variants.clerkHeadless]: './src/index.headless.ts',
   [variants.clerkHeadlessBrowser]: './src/index.headless.browser.ts',
+  [variants.clerkLegacyBrowser]: './src/index.legacy.browser.ts',
 };
 
 /**
  *
  * @param {object} config
  * @param {'development'|'production'} config.mode
+ * @param {string} config.variant
  * @param {boolean} [config.disableRHC=false]
  * @returns { import('@rspack/cli').Configuration }
  */
-const common = ({ mode, disableRHC = false }) => {
+const common = ({ mode, variant, disableRHC = false }) => {
   return {
     mode,
     resolve: {
@@ -65,7 +68,7 @@ const common = ({ mode, disableRHC = false }) => {
         }),
     ].filter(Boolean),
     output: {
-      chunkFilename: `[name]_[fullhash:6]_${packageJSON.version}.js`,
+      chunkFilename: `[name]_${variant}_[fullhash:6]_${packageJSON.version}.js`,
     },
     /**
      * Remove the Stripe dependencies from the bundle, if RHC is disabled.
@@ -156,8 +159,10 @@ const svgLoader = () => {
   };
 };
 
-/** @type { () => (import('@rspack/core').RuleSetRule[]) } */
-const typescriptLoaderProd = () => {
+/** @type { (opts?: { targets?: string, useCoreJs?: boolean }) => (import('@rspack/core').RuleSetRule[]) } */
+const typescriptLoaderProd = (
+  { targets = packageJSON.browserslist, useCoreJs = false } = { targets: packageJSON.browserslist, useCoreJs: false },
+) => {
   return [
     {
       test: /\.(jsx?|tsx?)$/,
@@ -166,7 +171,13 @@ const typescriptLoaderProd = () => {
         loader: 'builtin:swc-loader',
         options: {
           env: {
-            targets: packageJSON.browserslist,
+            targets,
+            ...(useCoreJs
+              ? {
+                  mode: 'usage',
+                  coreJs: require('core-js/package.json').version,
+                }
+              : {}),
           },
           jsc: {
             parser: {
@@ -188,12 +199,20 @@ const typescriptLoaderProd = () => {
     },
     {
       test: /\.m?js$/,
+      exclude: /node_modules[\\/]core-js/,
       use: {
         loader: 'builtin:swc-loader',
         options: {
           env: {
-            targets: packageJSON.browserslist,
+            targets,
+            ...(useCoreJs
+              ? {
+                  mode: 'usage',
+                  coreJs: '3.41.0',
+                }
+              : {}),
           },
+          isModule: 'unknown',
         },
       },
     },
@@ -231,24 +250,28 @@ const typescriptLoaderDev = () => {
 
 /**
  * Used for production builds that have dynamicly loaded chunks.
- * @type { () => (import('@rspack/core').Configuration) }
+ * @type { (opts?: { targets?: string, useCoreJs?: boolean }) => (import('@rspack/core').Configuration) }
  * */
-const commonForProdChunked = () => {
+const commonForProdChunked = (
+  { targets = packageJSON.browserslist, useCoreJs = false } = { targets: packageJSON.browserslist, useCoreJs: false },
+) => {
   return {
     module: {
-      rules: [svgLoader(), ...typescriptLoaderProd()],
+      rules: [svgLoader(), ...typescriptLoaderProd({ targets, useCoreJs })],
     },
   };
 };
 
 /**
  * Used for production builds that combine all files into one single file (such as for Chrome Extensions).
- * @type { () => (import('@rspack/core').Configuration) }
+ * @type { (opts?: { targets?: string, useCoreJs?: boolean }) => (import('@rspack/core').Configuration) }
  * */
-const commonForProdBundled = () => {
+const commonForProdBundled = (
+  { targets = packageJSON.browserslist, useCoreJs = false } = { targets: packageJSON.browserslist, useCoreJs: false },
+) => {
   return {
     module: {
-      rules: [svgLoader(), ...typescriptLoaderProd()],
+      rules: [svgLoader(), ...typescriptLoaderProd({ targets, useCoreJs })],
     },
   };
 };
@@ -288,6 +311,14 @@ const commonForProd = () => {
       //   minChunkSize: 10000,
       // })
     ],
+    resolve: {
+      alias: {
+        // SWC will inject imports to `core-js` into the source files that utilize polyfilled functions. Because we
+        // use pnpm, imports from other packages (like `packages/shared`) will not resolve. This alias forces rspack
+        // to resolve all `core-js` imports to the version we have installed in `clerk-js`.
+        'core-js': path.dirname(require.resolve('core-js/package.json')),
+      },
+    },
   };
 };
 
@@ -336,14 +367,21 @@ const prodConfig = ({ mode, env, analysis }) => {
           ],
         }
       : {},
-    common({ mode }),
+    common({ mode, variant: variants.clerkBrowser }),
     commonForProd(),
     commonForProdChunked(),
   );
 
+  const clerkLegacyBrowser = merge(
+    entryForVariant(variants.clerkLegacyBrowser),
+    common({ mode, variant: variants.clerkLegacyBrowser }),
+    commonForProd(),
+    commonForProdChunked({ targets: packageJSON.browserslistLegacy, useCoreJs: true }),
+  );
+
   const clerkHeadless = merge(
     entryForVariant(variants.clerkHeadless),
-    common({ mode }),
+    common({ mode, variant: variants.clerkHeadless }),
     commonForProd(),
     commonForProdChunked(),
     // Disable chunking for the headless variant, since it's meant to be used in a non-browser environment and
@@ -362,50 +400,62 @@ const prodConfig = ({ mode, env, analysis }) => {
 
   const clerkHeadlessBrowser = merge(
     entryForVariant(variants.clerkHeadlessBrowser),
-    common({ mode }),
+    common({ mode, variant: variants.clerkHeadlessBrowser }),
     commonForProd(),
     commonForProdChunked(),
     // externalsForHeadless(),
   );
 
-  const clerkEsm = merge(entryForVariant(variants.clerk), common({ mode }), commonForProd(), commonForProdBundled(), {
-    experiments: {
-      outputModule: true,
-    },
-    output: {
-      filename: '[name].mjs',
-      libraryTarget: 'module',
-    },
-    plugins: [
-      // Include the lazy chunks in the bundle as well
-      // so that the final bundle can be imported and bundled again
-      // by a different bundler, eg the webpack instance used by react-scripts
-      new rspack.optimize.LimitChunkCountPlugin({
-        maxChunks: 1,
-      }),
-    ],
-    optimization: {
-      splitChunks: false,
+  const clerkEsm = merge(
+    entryForVariant(variants.clerk),
+    common({ mode, variant: variants.clerk }),
+    commonForProd(),
+    commonForProdBundled(),
+    {
+      experiments: {
+        outputModule: true,
+      },
+      output: {
+        filename: '[name].mjs',
+        libraryTarget: 'module',
+      },
+      plugins: [
+        // Include the lazy chunks in the bundle as well
+        // so that the final bundle can be imported and bundled again
+        // by a different bundler, eg the webpack instance used by react-scripts
+        new rspack.optimize.LimitChunkCountPlugin({
+          maxChunks: 1,
+        }),
+      ],
+      optimization: {
+        splitChunks: false,
+      },
     },
-  });
+  );
 
-  const clerkCjs = merge(entryForVariant(variants.clerk), common({ mode }), commonForProd(), commonForProdBundled(), {
-    output: {
-      filename: '[name].js',
-      libraryTarget: 'commonjs',
-    },
-    plugins: [
-      // Include the lazy chunks in the bundle as well
-      // so that the final bundle can be imported and bundled again
-      // by a different bundler, eg the webpack instance used by react-scripts
-      new rspack.optimize.LimitChunkCountPlugin({
-        maxChunks: 1,
-      }),
-    ],
-    optimization: {
-      splitChunks: false,
+  const clerkCjs = merge(
+    entryForVariant(variants.clerk),
+    common({ mode, variant: variants.clerk }),
+    commonForProd(),
+    commonForProdBundled(),
+    {
+      output: {
+        filename: '[name].js',
+        libraryTarget: 'commonjs',
+      },
+      plugins: [
+        // Include the lazy chunks in the bundle as well
+        // so that the final bundle can be imported and bundled again
+        // by a different bundler, eg the webpack instance used by react-scripts
+        new rspack.optimize.LimitChunkCountPlugin({
+          maxChunks: 1,
+        }),
+      ],
+      optimization: {
+        splitChunks: false,
+      },
     },
-  });
+  );
 
   /** @type { () => (import('@rspack/core').Configuration) } */
   const commonForNoRHC = () => ({
@@ -424,7 +474,7 @@ const prodConfig = ({ mode, env, analysis }) => {
 
   const clerkEsmNoRHC = merge(
     entryForVariant(variants.clerkNoRHC),
-    common({ mode, disableRHC: true }),
+    common({ mode, disableRHC: true, variant: variants.clerkNoRHC }),
     commonForProd(),
     commonForProdBundled(),
     commonForNoRHC(),
@@ -441,7 +491,7 @@ const prodConfig = ({ mode, env, analysis }) => {
 
   const clerkCjsNoRHC = merge(
     entryForVariant(variants.clerkNoRHC),
-    common({ mode, disableRHC: true }),
+    common({ mode, disableRHC: true, variant: variants.clerkNoRHC }),
     commonForProd(),
     commonForProdBundled(),
     commonForNoRHC(),
@@ -458,7 +508,16 @@ const prodConfig = ({ mode, env, analysis }) => {
     return [clerkBrowser];
   }
 
-  return [clerkBrowser, clerkHeadless, clerkHeadlessBrowser, clerkEsm, clerkEsmNoRHC, clerkCjs, clerkCjsNoRHC];
+  return [
+    clerkBrowser,
+    clerkLegacyBrowser,
+    clerkHeadless,
+    clerkHeadlessBrowser,
+    clerkEsm,
+    clerkEsmNoRHC,
+    clerkCjs,
+    clerkCjsNoRHC,
+  ];
 };
 
 /**
@@ -527,31 +586,31 @@ const devConfig = ({ mode, env }) => {
     // prettier-ignore
     [variants.clerk]: merge(
       entryForVariant(variants.clerk),
-      common({ mode }),
+      common({ mode, variant: variants.clerk }),
       commonForDev(),
     ),
     // prettier-ignore
     [variants.clerkBrowser]: merge(
       entryForVariant(variants.clerkBrowser),
       isSandbox ? { entry: { sandbox: './sandbox/app.ts' } } : {},
-      common({ mode }),
+      common({ mode, variant: variants.clerkBrowser }),
       commonForDev(),
     ),
     // prettier-ignore
     [variants.clerkBrowserNoRHC]: merge(
       entryForVariant(variants.clerkBrowserNoRHC),
-      common({ mode, disableRHC: true }),
+      common({ mode, disableRHC: true, variant: variants.clerkBrowserNoRHC }),
       commonForDev(),
     ),
     [variants.clerkHeadless]: merge(
       entryForVariant(variants.clerkHeadless),
-      common({ mode }),
+      common({ mode, variant: variants.clerkHeadless }),
       commonForDev(),
       // externalsForHeadless(),
     ),
     [variants.clerkHeadlessBrowser]: merge(
       entryForVariant(variants.clerkHeadlessBrowser),
-      common({ mode }),
+      common({ mode, variant: variants.clerkHeadlessBrowser }),
       commonForDev(),
       // externalsForHeadless(),
     ),

packages/clerk-js/src/index.browser.ts

@@ -3,8 +3,6 @@
 // eslint-disable-next-line
 import './utils/setWebpackChunkPublicPath';
 
-import 'regenerator-runtime/runtime';
-
 import { Clerk } from './core/clerk';
 
 import { mountComponentRenderer } from './ui/Components';

packages/clerk-js/src/index.legacy.browser.ts

@@ -0,0 +1,38 @@
+// It's crucial this is the first import,
+// otherwise chunk loading will not work
+// eslint-disable-next-line
+import './utils/setWebpackChunkPublicPath';
+
+import 'regenerator-runtime/runtime';
+
+import { Clerk } from './core/clerk';
+
+import { mountComponentRenderer } from './ui/Components';
+
+Clerk.mountComponentRenderer = mountComponentRenderer;
+
+const publishableKey =
+  document.querySelector('script[data-clerk-publishable-key]')?.getAttribute('data-clerk-publishable-key') ||
+  window.__clerk_publishable_key ||
+  '';
+
+const proxyUrl =
+  document.querySelector('script[data-clerk-proxy-url]')?.getAttribute('data-clerk-proxy-url') ||
+  window.__clerk_proxy_url ||
+  '';
+
+const domain =
+  document.querySelector('script[data-clerk-domain]')?.getAttribute('data-clerk-domain') || window.__clerk_domain || '';
+
+// Ensure that if the script has already been injected we don't overwrite the existing Clerk instance.
+if (!window.Clerk) {
+  window.Clerk = new Clerk(publishableKey, {
+    proxyUrl,
+    // @ts-expect-error
+    domain,
+  });
+}
+
+if (module.hot) {
+  module.hot.accept();
+}