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Hello, world! I’m studying Graphql and I’m having a problem with this Mutation...
var schema = buildSchema('
    type userAccount {
        firstName: String!
        lastName: String!
        mobileNumber: String 
        email: String 
        password: String!
    }
    type Mutation {
        createAccount(
            firstName: String!, 
            lastName: String!,
            mobileNumber: String,
            email: String,
            password: String!
        ): userAccount
    }
');
var root = {
    createAccount: ({firstName, lastName, mobileNumber, email, password}) => {
// AccountModel.create é um model do sequelize que registra os dados, isso funciona, mas a mutation retorna null
        AccountModel.create({ 
            firstName,
            lastName,
            mobileNumber,
            email,
            password
        })
    }
};
// Then in localhost:3000/graphiql I do Mutation and it returns null(I should return the account I just registered)

Behold this post from the Graphql documentation itself.
– Gustavo Sampaio
Ah, and in the original code,
buildSchema, you put simple quotes (') or grave accent (```)?– Gustavo Sampaio
In the original code I used crases( ` )
– Gabriel Mendes