How to use the webiny-model.IntegerAttribute function in webiny-model

let type = null;
    let resolve = null;

    if (attr instanceof BufferAttribute) {
        type = GraphQLString;
    }

    if (attr instanceof attrs.CharAttribute) {
        type = GraphQLString;
    }

    if (attr instanceof attrs.BooleanAttribute) {
        type = GraphQLBoolean;
    }

    if (attr instanceof attrs.IntegerAttribute) {
        type = GraphQLInt;
    }

    if (attr instanceof attrs.FloatAttribute) {
        type = GraphQLFloat;
    }

    if (attr instanceof attrs.ArrayAttribute) {
        type = new GraphQLList(GraphQLJSON);
    }

    if (attr instanceof attrs.ObjectAttribute) {
        type = GraphQLJSON;
    }

    if (attr instanceof ModelAttribute) {