Picklist in LWC Datatable Inline Edit

public class AccountDataController {
    
    @AuraEnabled (cacheable=true)
    public static List<Account> fetchAccounts(){
        return [SELECT Id, Name, Type, Phone 
                FROM Account WHERE Type !='' LIMIT 10];       
    }
}

<template>

</template>

import LightningDatatable from 'lightning/datatable';
import picklistColumn from './picklistColumn.html';
import pickliststatic from './pickliststatic.html'

export default class LWCCustomDatatableType extends LightningDatatable {
    static customTypes = {
        picklistColumn: {
            template: pickliststatic,
            editTemplate: picklistColumn,
            standardCellLayout: true,
            typeAttributes: ['label', 'placeholder', 'options', 'value', 'context', 'variant','name']
        }
    };
}

<template>
    <!-- header -->
    <div class="slds-tabs_card">
		<div class="slds-page-header">
			<div class="slds-page-header__row">
				<div class="slds-page-header__col-title">
					<div class="slds-media">
						<div class="slds-media__figure">
							<span class="slds-icon_container slds-icon-standard-opportunity">
								 <lightning-icon icon-name="standard:recipe" alternative-text="recipe" title="recipe"></lightning-icon>
                            </span>
						</div>
						<div class="slds-media__body">
							<div class="slds-page-header__name">
								<div class="slds-page-header__name-title">
									<h1>
										<span>PickList In LWC Inline Datatable Edit</span>
										<span class="slds-page-header__title slds-truncate" title="Recently Viewed">TechDicer</span>
									</h1>
								</div>
							</div>
						</div>
					</div>
				</div>
			</div>
		</div>
	</div> <br/>
    <!-- /header -->

    <!-- create folder card -->
    <lightning-card  variant="Narrow"  title="PickList In LWC Inline Datatable Edit" icon-name="standard:folder" class="cardSpinner">
        <!-- loader -->
        <div if:true={showSpinner}>
            <lightning-spinner
                alternative-text="Loading..." variant="brand">
            </lightning-spinner>
        </div>
        <!-----/loader-------->
        <div class="slds-var-p-around_small">
            <template if:true={data}>
                <c-l-w-c-custom-datatable-type
                    key-field="Id" 
                    data={data} 
                    columns={columns} 
                    onvalueselect={handleSelection}
                    draft-values={draftValues} 
                    oncellchange={handleCellChange}
                    onsave={handleSave}
                    oncancel={handleCancel}
                    hide-checkbox-column>
                </c-l-w-c-custom-datatable-type>
            </template>
        </div>
    </lightning-card>
</template>

import { LightningElement, track, wire } from 'lwc';
import fetchAccounts from '@salesforce/apex/AccountDataController.fetchAccounts';
import ACCOUNT_OBJECT from '@salesforce/schema/Account';
import TYPE_FIELD from '@salesforce/schema/Account.Type';
import { updateRecord } from 'lightning/uiRecordApi';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';
import { refreshApex } from '@salesforce/apex';
import { getPicklistValues, getObjectInfo } from 'lightning/uiObjectInfoApi';

const columns = [
    { label: 'Name', fieldName: 'Name', editable: true },
    { label: 'Phone', fieldName: 'Phone', type: 'phone', editable: true },
    {
        label: 'Type', fieldName: 'Type', type: 'picklistColumn', editable: true, typeAttributes: {
            placeholder: 'Choose Type', options: { fieldName: 'pickListOptions' }, 
            value: { fieldName: 'Type' }, // default value for picklist,
            context: { fieldName: 'Id' } // binding account Id with context variable to be returned back
        }
    }
]

export default class CustomDatatableDemo extends LightningElement {
    columns = columns;
    showSpinner = false;
    @track data = [];
    @track accountData;
    @track draftValues = [];
    lastSavedData = [];
    @track pickListOptions;

    @wire(getObjectInfo, { objectApiName: ACCOUNT_OBJECT })
    objectInfo;

    //fetch picklist options
    @wire(getPicklistValues, {
        recordTypeId: "$objectInfo.data.defaultRecordTypeId",
        fieldApiName: TYPE_FIELD
    })

    wirePickList({ error, data }) {
        if (data) {
            this.pickListOptions = data.values;
        } else if (error) {
            console.log(error);
        }
    }

    //here I pass picklist option so that this wire method call after above method
    @wire(fetchAccounts, { pickList: '$pickListOptions' })
    accountData(result) {
        this.accountData = result;
        if (result.data) {
            this.data = JSON.parse(JSON.stringify(result.data));

            this.data.forEach(ele => {
                ele.pickListOptions = this.pickListOptions;
            })

            this.lastSavedData = JSON.parse(JSON.stringify(this.data));

        } else if (result.error) {
            this.data = undefined;
        }
    };

    updateDataValues(updateItem) {
        let copyData = JSON.parse(JSON.stringify(this.data));

        copyData.forEach(item => {
            if (item.Id === updateItem.Id) {
                for (let field in updateItem) {
                    item[field] = updateItem[field];
                }
            }
        });

        //write changes back to original data
        this.data = [...copyData];
    }

    updateDraftValues(updateItem) {
        let draftValueChanged = false;
        let copyDraftValues = [...this.draftValues];
        //store changed value to do operations
        //on save. This will enable inline editing &
        //show standard cancel & save button
        copyDraftValues.forEach(item => {
            if (item.Id === updateItem.Id) {
                for (let field in updateItem) {
                    item[field] = updateItem[field];
                }
                draftValueChanged = true;
            }
        });

        if (draftValueChanged) {
            this.draftValues = [...copyDraftValues];
        } else {
            this.draftValues = [...copyDraftValues, updateItem];
        }
    }

    //handler to handle cell changes & update values in draft values
    handleCellChange(event) {
        //this.updateDraftValues(event.detail.draftValues[0]);
        let draftValues = event.detail.draftValues;
        draftValues.forEach(ele=>{
            this.updateDraftValues(ele);
        })
    }

    handleSave(event) {
        this.showSpinner = true;
        this.saveDraftValues = this.draftValues;

        const recordInputs = this.saveDraftValues.slice().map(draft => {
            const fields = Object.assign({}, draft);
            return { fields };
        });

        // Updateing the records using the UiRecordAPi
        const promises = recordInputs.map(recordInput => updateRecord(recordInput));
        Promise.all(promises).then(res => {
            this.showToast('Success', 'Records Updated Successfully!', 'success', 'dismissable');
            this.draftValues = [];
            return this.refresh();
        }).catch(error => {
            console.log(error);
            this.showToast('Error', 'An Error Occured!!', 'error', 'dismissable');
        }).finally(() => {
            this.draftValues = [];
            this.showSpinner = false;
        });
    }

    handleCancel(event) {
        //remove draftValues & revert data changes
        this.data = JSON.parse(JSON.stringify(this.lastSavedData));
        this.draftValues = [];
    }

    showToast(title, message, variant, mode) {
        const evt = new ShowToastEvent({
            title: title,
            message: message,
            variant: variant,
            mode: mode
        });
        this.dispatchEvent(evt);
    }

    // This function is used to refresh the table once data updated
    async refresh() {
        await refreshApex(this.accountData);
    }
}

.cardSpinner{
    position: relative;;
}