feat(clerk-js,clerk-react,types): Introduce state signals

.changeset/dull-cups-accept.md

@@ -0,0 +1,7 @@
+---
+'@clerk/clerk-js': patch
+'@clerk/clerk-react': patch
+'@clerk/types': patch
+---
+
+[Experimental] Signals

packages/clerk-js/bundlewatch.config.json

@@ -1,9 +1,9 @@
 {
   "files": [
-    { "path": "./dist/clerk.js", "maxSize": "620KB" },
-    { "path": "./dist/clerk.browser.js", "maxSize": "74KB" },
-    { "path": "./dist/clerk.legacy.browser.js", "maxSize": "115.08KB" },
-    { "path": "./dist/clerk.headless*.js", "maxSize": "55.2KB" },
+    { "path": "./dist/clerk.js", "maxSize": "621KB" },
+    { "path": "./dist/clerk.browser.js", "maxSize": "75KB" },
+    { "path": "./dist/clerk.legacy.browser.js", "maxSize": "117KB" },
+    { "path": "./dist/clerk.headless*.js", "maxSize": "57KB" },
     { "path": "./dist/ui-common*.js", "maxSize": "113KB" },
     { "path": "./dist/ui-common*.legacy.*.js", "maxSize": "118KB" },
     { "path": "./dist/vendors*.js", "maxSize": "40.2KB" },

packages/clerk-js/package.json

@@ -75,6 +75,7 @@
     "@swc/helpers": "^0.5.17",
     "@zxcvbn-ts/core": "3.0.4",
     "@zxcvbn-ts/language-common": "3.0.4",
+    "alien-signals": "2.0.6",
     "browser-tabs-lock": "1.3.0",
     "copy-to-clipboard": "3.3.3",
     "core-js": "3.41.0",

packages/clerk-js/src/core/clerk.ts

@@ -154,6 +154,7 @@ import {
   Waitlist,
 } from './resources/internal';
 import { navigateToTask } from './sessionTasks';
+import { State } from './state';
 import { warnings } from './warnings';
 
 type SetActiveHook = (intent?: 'sign-out') => void | Promise<void>;
@@ -211,6 +212,7 @@ export class Clerk implements ClerkInterface {
   public user: UserResource | null | undefined;
   public __internal_country?: string | null;
   public telemetry: TelemetryCollector | undefined;
+  public readonly __internal_state: State = new State();
 
   protected internal_last_error: ClerkAPIError | null = null;
   // converted to protected environment to support `updateEnvironment` type assertion

packages/clerk-js/src/core/events.ts

@@ -1,20 +1,28 @@
 import { createEventBus } from '@clerk/shared/eventBus';
 import type { TokenResource } from '@clerk/types';
 
+import type { BaseResource } from './resources/Base';
+
 export const events = {
   TokenUpdate: 'token:update',
   UserSignOut: 'user:signOut',
   EnvironmentUpdate: 'environment:update',
   SessionTokenResolved: 'session:tokenResolved',
+  ResourceUpdate: 'resource:update',
+  ResourceError: 'resource:error',
 } as const;
 
 type TokenUpdatePayload = { token: TokenResource | null };
+export type ResourceUpdatePayload = { resource: BaseResource };
+export type ResourceErrorPayload = { resource: BaseResource; error: unknown };
 
 type InternalEvents = {
   [events.TokenUpdate]: TokenUpdatePayload;
   [events.UserSignOut]: null;
   [events.EnvironmentUpdate]: null;
   [events.SessionTokenResolved]: null;
+  [events.ResourceUpdate]: ResourceUpdatePayload;
+  [events.ResourceError]: ResourceErrorPayload;
 };
 
 export const eventBus = createEventBus<InternalEvents>();

packages/clerk-js/src/core/resources/SignIn.ts

@@ -16,6 +16,7 @@ import type {
   EmailCodeConfig,
   EmailLinkConfig,
   EnterpriseSSOConfig,
+  OAuthStrategy,
   PassKeyConfig,
   PasskeyFactor,
   PhoneCodeConfig,
@@ -27,6 +28,7 @@ import type {
   SamlConfig,
   SignInCreateParams,
   SignInFirstFactor,
+  SignInFutureResource,
   SignInIdentifier,
   SignInJSON,
   SignInJSONSnapshot,
@@ -66,6 +68,7 @@ import {
   clerkVerifyPasskeyCalledBeforeCreate,
   clerkVerifyWeb3WalletCalledBeforeCreate,
 } from '../errors';
+import { eventBus } from '../events';
 import { BaseResource, UserData, Verification } from './internal';
 
 export class SignIn extends BaseResource implements SignInResource {
@@ -82,6 +85,21 @@ export class SignIn extends BaseResource implements SignInResource {
   createdSessionId: string | null = null;
   userData: UserData = new UserData(null);
 
+  /**
+   * @experimental This experimental API is subject to change.
+   *
+   * An instance of `SignInFuture`, which has a different API than `SignIn`, intended to be used in custom flows.
+   */
+  __internal_future: SignInFuture | null = new SignInFuture(this);
+
+  /**
+   * @internal Only used for internal purposes, and is not intended to be used directly.
+   *
+   * This property is used to provide access to underlying Client methods to `SignInFuture`, which wraps an instance
+   * of `SignIn`.
+   */
+  __internal_basePost = this._basePost.bind(this);
+
   constructor(data: SignInJSON | SignInJSONSnapshot | null = null) {
     super();
     this.fromJSON(data);
@@ -451,6 +469,8 @@ export class SignIn extends BaseResource implements SignInResource {
       this.createdSessionId = data.created_session_id;
       this.userData = new UserData(data.user_data);
     }
+
+    eventBus.emit('resource:update', { resource: this });
     return this;
   }
 
@@ -470,3 +490,132 @@ export class SignIn extends BaseResource implements SignInResource {
     };
   }
 }
+
+class SignInFuture implements SignInFutureResource {
+  emailCode = {
+    sendCode: this.sendEmailCode.bind(this),
+    verifyCode: this.verifyEmailCode.bind(this),
+  };
+
+  constructor(readonly resource: SignIn) {}
+
+  get status() {
+    return this.resource.status;
+  }
+
+  async create(params: {
+    identifier?: string;
+    strategy?: OAuthStrategy | 'saml' | 'enterprise_sso';
+    redirectUrl?: string;
+    actionCompleteRedirectUrl?: string;
+  }): Promise<{ error: unknown }> {
+    eventBus.emit('resource:error', { resource: this.resource, error: null });
+    try {
+      await this.resource.__internal_basePost({
+        path: this.resource.pathRoot,
+        body: params,
+      });
+
+      return { error: null };
+    } catch (err) {
+      eventBus.emit('resource:error', { resource: this.resource, error: err });
+      return { error: err };
+    }
+  }
+
+  async password({ identifier, password }: { identifier: string; password: string }): Promise<{ error: unknown }> {
+    eventBus.emit('resource:error', { resource: this.resource, error: null });
+    try {
+      await this.resource.__internal_basePost({
+        path: this.resource.pathRoot,
+        body: { identifier, password },
+      });
+    } catch (err) {
+      eventBus.emit('resource:error', { resource: this.resource, error: err });
+      return { error: err };
+    }
+
+    return { error: null };
+  }
+
+  async sendEmailCode({ email }: { email: string }): Promise<{ error: unknown }> {
+    eventBus.emit('resource:error', { resource: this.resource, error: null });
+    try {
+      if (!this.resource.id) {
+        await this.create({ identifier: email });
+      }
+
+      const emailCodeFactor = this.resource.supportedFirstFactors?.find(f => f.strategy === 'email_code');
+
+      if (!emailCodeFactor) {
+        throw new Error('Email code factor not found');
+      }
+
+      const { emailAddressId } = emailCodeFactor;
+      await this.resource.__internal_basePost({
+        body: { emailAddressId, strategy: 'email_code' },
+        action: 'prepare_first_factor',
+      });
+    } catch (err: unknown) {
+      eventBus.emit('resource:error', { resource: this.resource, error: err });
+      return { error: err };
+    }
+
+    return { error: null };
+  }
+
+  async verifyEmailCode({ code }: { code: string }): Promise<{ error: unknown }> {
+    eventBus.emit('resource:error', { resource: this.resource, error: null });
+    try {
+      await this.resource.__internal_basePost({
+        body: { code, strategy: 'email_code' },
+        action: 'attempt_first_factor',
+      });
+    } catch (err: unknown) {
+      eventBus.emit('resource:error', { resource: this.resource, error: err });
+      return { error: err };
+    }
+
+    return { error: null };
+  }
+
+  async sso({
+    flow = 'auto',
+    strategy,
+    redirectUrl,
+    redirectUrlComplete,
+  }: {
+    flow?: 'auto' | 'modal';
+    strategy: OAuthStrategy | 'saml' | 'enterprise_sso';
+    redirectUrl: string;
+    redirectUrlComplete: string;
+  }): Promise<{ error: unknown }> {
+    eventBus.emit('resource:error', { resource: this.resource, error: null });
+    try {
+      if (flow !== 'auto') {
+        throw new Error('modal flow is not supported yet');
+      }
+
+      const redirectUrlWithAuthToken = SignIn.clerk.buildUrlWithAuth(redirectUrl);
+
+      if (!this.resource.id) {
+        await this.create({
+          strategy,
+          redirectUrl: redirectUrlWithAuthToken,
+          actionCompleteRedirectUrl: redirectUrlComplete,
+        });
+      }
+
+      const { status, externalVerificationRedirectURL } = this.resource.firstFactorVerification;
+
+      if (status === 'unverified' && externalVerificationRedirectURL) {
+        windowNavigate(externalVerificationRedirectURL);
+      }
+    } catch (err: unknown) {
+      eventBus.emit('resource:error', { resource: this.resource, error: err });
+      return { error: err };
+    }
+
+    return { error: null };
+  }
+}

packages/clerk-js/src/core/signals.ts

@@ -0,0 +1,17 @@
+import { computed, signal } from 'alien-signals';
+
+import type { SignIn } from './resources/SignIn';
+
+export const signInSignal = signal<{ resource: SignIn | null }>({ resource: null });
+export const signInErrorSignal = signal<{ errors: unknown }>({ errors: null });
+
+export const signInComputedSignal = computed(() => {
+  const signIn = signInSignal().resource;
+  const errors = signInErrorSignal().errors;
+
+  if (!signIn) {
+    return { errors: null, signIn: null };
+  }
+
+  return { errors, signIn: signIn.__internal_future };
+});

packages/clerk-js/src/core/state.ts

@@ -0,0 +1,33 @@
+import type { State as StateInterface } from '@clerk/types';
+import { computed, effect } from 'alien-signals';
+
+import { eventBus } from './events';
+import type { BaseResource } from './resources/Base';
+import { SignIn } from './resources/SignIn';
+import { signInComputedSignal, signInErrorSignal, signInSignal } from './signals';
+
+export class State implements StateInterface {
+  signInResourceSignal = signInSignal;
+  signInErrorSignal = signInErrorSignal;
+  signInSignal = signInComputedSignal;
+
+  __internal_effect = effect;
+  __internal_computed = computed;
+
+  constructor() {
+    eventBus.on('resource:update', this.onResourceUpdated);
+    eventBus.on('resource:error', this.onResourceError);
+  }
+
+  private onResourceError = (payload: { resource: BaseResource; error: unknown }) => {
+    if (payload.resource instanceof SignIn) {
+      this.signInErrorSignal({ errors: payload.error });
+    }
+  };
+
+  private onResourceUpdated = (payload: { resource: BaseResource }) => {
+    if (payload.resource instanceof SignIn) {
+      this.signInResourceSignal({ resource: payload.resource });
+    }
+  };
+}

packages/react/src/experimental.ts

@@ -1,6 +1,7 @@
 export { CheckoutButton } from './components/CheckoutButton';
 export { PlanDetailsButton } from './components/PlanDetailsButton';
 export { SubscriptionDetailsButton } from './components/SubscriptionDetailsButton';
+export { useSignInSignal } from './hooks/useClerkSignal';
 
 export type {
   __experimental_CheckoutButtonProps as CheckoutButtonProps,

packages/react/src/hooks/useClerkSignal.ts

@@ -0,0 +1,52 @@
+import type { SignInFutureResource } from '@clerk/types';
+import { useCallback, useSyncExternalStore } from 'react';
+
+import { useIsomorphicClerkContext } from '../contexts/IsomorphicClerkContext';
+import { useAssertWrappedByClerkProvider } from './useAssertWrappedByClerkProvider';
+
+function useClerkSignal(signal: 'signIn'): { errors: unknown; signIn: SignInFutureResource | null } | null {
+  useAssertWrappedByClerkProvider('useSignInSignal');
+
+  const clerk = useIsomorphicClerkContext();
+
+  const subscribe = useCallback(
+    (callback: () => void) => {
+      if (!clerk.loaded || !clerk.__internal_state) {
+        return () => {};
+      }
+
+      return clerk.__internal_state.__internal_effect(() => {
+        switch (signal) {
+          case 'signIn':
+            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- we know that the state is defined
+            clerk.__internal_state!.signInSignal();
+            break;
+          default:
+            throw new Error(`Unknown signal: ${signal}`);
+        }
+        callback();
+      });
+    },
+    [clerk, clerk.loaded, clerk.__internal_state],
+  );
+  const getSnapshot = useCallback(() => {
+    if (!clerk.__internal_state) {
+      return null;
+    }
+
+    switch (signal) {
+      case 'signIn':
+        return clerk.__internal_state.signInSignal();
+      default:
+        throw new Error(`Unknown signal: ${signal}`);
+    }
+  }, [clerk.__internal_state]);
+
+  const value = useSyncExternalStore(subscribe, getSnapshot, getSnapshot);
+
+  return value;
+}
+
+export function useSignInSignal() {
+  return useClerkSignal('signIn');
+}

packages/react/src/isomorphicClerk.ts

@@ -44,6 +44,7 @@ import type {
   SignUpProps,
   SignUpRedirectOptions,
   SignUpResource,
+  State,
   TaskChooseOrganizationProps,
   UnsubscribeCallback,
   UserButtonProps,
@@ -714,6 +715,10 @@ export class IsomorphicClerk implements IsomorphicLoadedClerk {
     return this.clerkjs?.billing;
   }
 
+  get __internal_state(): State | undefined {
+    return this.clerkjs?.__internal_state;
+  }
+
   get apiKeys(): APIKeysNamespace | undefined {
     return this.clerkjs?.apiKeys;
   }