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import { HydratedDocument, Model, Query, Schema, model } from 'mongoose';
interface Project {  name: string;  stars: number;}
type ProjectModelType = Model<Project, ProjectQueryHelpers>;// Query helpers should return `Query<any, Document<DocType>> & ProjectQueryHelpers`// to enable chaining.type ProjectModelQuery = Query<any, HydratedDocument<Project>, ProjectQueryHelpers> & ProjectQueryHelpers;interface ProjectQueryHelpers {  byName(this: ProjectModelQuery, name: string): ProjectModelQuery;}
const schema = new Schema<Project, ProjectModelType, {}, ProjectQueryHelpers>({  name: { type: String, required: true },  stars: { type: Number, required: true }});schema.query.byName = function(name: string): ProjectModelQuery {  return this.find({ name: name });};
// 2nd param to `model()` is the Model class to return.const ProjectModel = model<Project, ProjectModelType>('Project', schema);
ProjectModel.find().where('stars').gt(1000).byName('mongoose').exec();