How to implement user authentication

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        const info = new OAuthInfo({
            appId: "YOUR_CLIENT_ID",
        });


        esriId.registerOAuthInfos([info]);
        esriId
            .checkSignInStatus(info.portalUrl + "/sharing")
            .then(() => {
                handleSignedIn();
            })
            .catch(() => {
                handleSignedOut();
            });

        document.getElementById("sign-in").addEventListener("click", function () {
            esriId.getCredential(info.portalUrl + "/sharing");
        });

        document.getElementById("sign-out").addEventListener("click", function () {
            esriId.destroyCredentials();
            window.location.reload();
        });
        let map;

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            const authorizationEndpoint = 'https://www.arcgis.com/sharing/rest/oauth2/authorize'+
            '?client_id=' + clientId +
            '&code_challenge=' + codeChallenge +
            '&code_challenge_method=S256' +
            '&redirect_uri=' + window.encodeURIComponent(redirectUri)+
            '&response_type=code'+
            '&expiration=20160';

            signInButton.addEventListener('click', () => window.open(authorizationEndpoint, 'oauth-window', 'height=400,width=600,menubar=no,location=yes,resizable=yes,scrollbars=yes,status=yes'));

            signOutButton.addEventListener('click', () => updateSession(false));

            const oauthCallback = (authorizationCode) => {

                const tokenEndpoint = 'https://www.arcgis.com/sharing/rest/oauth2/token';

                fetch(tokenEndpoint, {
                    method:'POST',
                    body: JSON.stringify({
                        client_id:clientId,
                        grant_type:'authorization_code',
                        code:authorizationCode,
                        redirect_uri:redirectUri,
                        code_verifier:codeVerifier
                    }),
                    headers: {
                        "Content-type": "application/json; charset=UTF-8"
                    }
                })

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        function handleSignedIn() {

            map = new Map({
                basemap: "arcgis/topographic" // basemap styles service
            });
            const view = new MapView({
                map: map,
                center: [-118.805, 34.027], // Longitude, latitude
                zoom: 13, // Zoom level
                container: "viewDiv" // Div element
            });

        }