for the node+mongoose project I wrote, the code that defines the mongoose module is stored in the models folder. If I write a module.exports= export, node will report an error.

here is a model

const mongoose = require("mongoose")
const Schema = mongoose.Schema
const mongoosePaginate = require("mongoose-paginate")

// 
/**
*fieldType:
 (input)text
 textarea
 (input)number
 (input)email
 (input)date
  (input)radio
 (input)checkbox
 select
 table
 (input)file(url)
*/
const FormModelSchema = new Schema({
    formName: String,
    instruction: String,
    userName: String,
    updateUserName: String,
    userId:String,
    updateUserId: String,
    createAt: {type: Date, default: Date.now},
    updateAt: {type: Date, default: Date.now},
    formFields: [{
        displayName: String,
        // fieldName:String,
        fieldType: String,
        placeholder:String,
        isRequired:{type: Boolean, default: false},
        value:String,
        column:String,
        fieldOptions:[{
            displayText:String,
        }],
        fieldOrder:Number
        // or   /
        // maxSize:String, 
    }]
})
// Defines a pre hook for the document.
FormModelSchema.pre("save", function(next) {
    if (this.isNew) {
        this.createAt = this.   updateAt = Date.now()
    }
    else {
        this.updateAt = Date.now()
    }
    next()
})
FormModelSchema.plugin(mongoosePaginate)

var FormModel=mongoose.model("FormModel", FormModelSchema)
module.exports=FormModel

this is an error message:

app.jsrequire modelsjs

:
modelformModel

model:

: