wireDecoratorHandleError.js

import { wire } from 'lwc';
import { getRecord } from 'lightning/uiRecordApi';

export default class MyComponent extends LightningElement {
    @api recordId;
    @track error;
    @wire(getRecord, { recordId: '$recordId', fields: ['Account.Name'] }, {
        error: this.handleError
    })
    account;

    handleError(error) {
        this.error = error;
    }
}