Lightning Record Edit Form js file

LightningRecordEditForm

import { LightningElement } from 'lwc';
import { NavigationMixin } from 'lightning/navigation';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';

export default class  LightningRecordEditForm extends NavigationMixin (LightningElement) {
    redirect = true;
    resetpage = false;
    handleSuccess(event) {
        const even = new ShowToastEvent({
            title: 'Success!',
            message: 'Record created!',
            variant: 'success'
        });
        this.dispatchEvent(even);
        if(this.redirect == true){
            console.log('handleSuccess'+this.redirect);
            let creditnoteId = event.detail.id;
            this[NavigationMixin.Navigate]({
                type: 'standard__recordPage',
                attributes: {
                    recordId:creditnoteId,
                    objectApiName:'Account',
                    actionName:'view'
                }
            })
        }
        if(this.resetpage== true){
            this.handleReset();
        }
    }

    handleError(event){
        const evt = new ShowToastEvent({
            title: 'Error!',
            message: event.detail.detail,
            variant: 'error',
            mode:'dismissable'
        });
        this.dispatchEvent(evt);
    }

    saveAndNewClick() {
        this.redirect = false;
        this.template.querySelector('lightning-record-edit-form').submit(this.fields);
        this.resetpage = true;
    }
    
    handleReset() {
       const inputFields = this.template.querySelectorAll(
           'lightning-input-field'
       );
       if (inputFields) {
           inputFields.forEach(field => {
               field.reset();
           });
       }
    }
    
    handleCancel(event){
        var url = window.location.href; 
        var value = url.substr(0,url.lastIndexOf('/') + 1);
        window.history.back();
        return false;
    }
}