Stytch token integration and side code

integration.ts

export const getStytchTokenFromSessionIdLambdaIntegration =  (
    stack: Construct,
    id:string,
    options:InfrastructureOptions) => {

    const getToken = new NodejsFunction(stack, id, {
        architecture: Architecture.ARM_64,
        entry: `${__dirname}/token.ts`,
        logRetention: RetentionDays.ONE_WEEK,
        timeout: Duration.minutes(1),
        memorySize: 256,
        initialPolicy: [
            new PolicyStatement({
                actions: ["ssm:GetParameter","ssm:DeleteParameter"],
                resources: ["*"],
            }),

        ],
        environment:{
            ENV: options.environ
        }
    });

    return getToken;
}

loadStytch.ts

export const whenJwtExpiresLocal = (token: string) => {
    try{
        const obj = parseJwt(token);
        return whenJwtExpiresMs(obj);
    }catch (e){
        Logger.ERROR(e);
        Logger.ERROR('ERROR DURING authenticateJwtLocal WITH ' + token);
        return null;
    }
}

export function whenJwtExpiresMs(payload: ParsedJwtSession) {
    const expAt = new Date(payload["https://stytch.com/session"].expires_at).getTime();
    const now = new Date().getTime();
    return expAt - now;
}