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import { Schema, Document, connection } from 'mongoose';
interface ITest extends Document {  foo: string;  getAnswer(): number;}
const TestSchema = new Schema<ITest>({  foo: { type: String, required: true }});
TestSchema.methods.getAnswer = function(): number {  console.log(this.foo.trim());  return 42;};
const Test = connection.model<ITest>('Test', TestSchema);
Test.create({ foo: 'test' });
const doc: ITest = new Test({ foo: 'test' });
Math.floor(doc.getAnswer());