10 examples of 'firebase.auth().onauthstatechanged' in JavaScript

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export function onAuthStateChanged(callback: (user: firebase.User) => void): void {
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    firebase.auth().onAuthStateChanged(callback);
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}

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export function onAuthStateChanged(callback: Function) {
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  firebase.auth().onAuthStateChanged(callback);
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}

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export function onAuthStateChanged(
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  callback: (user: firebase.User | null) => void
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): void {
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  firebase.auth().onAuthStateChanged(callback);
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}

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export function onAuthStateChanged(cb: (u: types.User) => void) {
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  firebase.auth().onAuthStateChanged(cb);
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  firebase.auth().onAuthStateChanged((user: types.User) => {
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  });
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}

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onAuthStateChanged(): Observable {
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  return;
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}

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onAuthStateChanged_  (user) {
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    if (user) {
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        this.uid_ = user.uid;
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        // User signed in!
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        logger.info("AuthStatueChanged User : " + this.uid_ + " Signed In");
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        this.initFirebaseClient();
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    }  else {
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        logger.info('AuthStatueChanged User : SignOut');
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        if( this.uid_  ) {
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            this.unInitFirebaseClient();
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        };
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    };
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}

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public onAuthStateChanged(handler: (user: User) => void,  error?: (err) => any, completed?: Unsubscribe): Unsubscribe {
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  this.authStateChangedHandler = handler;
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  if (error) this.authStateOnErrorHandler = error;
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  console.log(">> added onAuthStateChanged handler");
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  handler(this.currentUser);
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  return () => {
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    this.authStateChangedHandler = undefined;
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    this.authStateOnErrorHandler = undefined;
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  };
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}

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function authStateObserver(user) {
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	if (user) { // User is signed in!
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		// Get the signed-in user's profile pic and name.
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		var profilePicUrl = getProfilePicUrl();
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		var userName = getUserName();
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		var data = {
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			message: 'Signed in as ' + userName,
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			timeout: 3000
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		};
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		signInSnackbarElement.MaterialSnackbar.showSnackbar(data);
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		// Set the user's profile pic and name.
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		userPicElement.style.backgroundImage = 'url(' + addSizeToGoogleProfilePic(profilePicUrl) + ')';
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		//		userNameElement.textContent = userName;
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		// Show user's profile and sign-out button.
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		//		userNameElement.removeAttribute('hidden');
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		userPicElement.removeAttribute('hidden');
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		signOutButtonElement.removeAttribute('hidden');
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		// Hide sign-in button.
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		signInButtonElement.setAttribute('hidden', 'true');
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		// We save the Firebase Messaging Device token and enable notifications.
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		saveMessagingDeviceToken();
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	} else { // User is signed out!
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		// Hide user's profile and sign-out button.
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		//		userNameElement.setAttribute('hidden', 'true');
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		userPicElement.setAttribute('hidden', 'true');
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		signOutButtonElement.setAttribute('hidden', 'true');
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		var data = {
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			message: 'Signed out!',
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			timeout: 3000
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		};
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		signInSnackbarElement.MaterialSnackbar.showSnackbar(data);
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		// Show sign-in button.
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		signInButtonElement.removeAttribute('hidden');
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	}
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}

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handleAuthStateChange(state, data) {
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	this.setState({ authState: state, authData: data });
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}

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public resumeState(user) {
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}