please explain the following code:

import { CATEGORIES\_EN\_US, PRODUCTS\_EN\_US } from 'App/constants/collections'
import { getCollection } from 'App/utils/firestore'
import { Parser } from 'json2csv';

(async () => {
 const products = await getCollection({
 collection: PRODUCTS\_EN\_US
 })

 const categories = await getCollection({
 collection: CATEGORIES\_EN\_US
 })

 const vtexCategoriesMap = {
 'Serums & Treatments': 1200,
 'Masks': 1300,
 'Cleansers': 1400,
 'Essence & Toners': 1500,
 'Eye Care': 1600,
 'Face Oils': 1700,
 'Face': 2100,
 'Eyes': 2200,
 'Lips': 2300,
 'Makeup Removers': 2400,
 'Moisturizers': 3100,
 'Body Wash & Scrubs': 3200,
 'Hair Care': 3300,
 'Sun Protection': 3400,
 'Hand Care': 3500
 }

 let categoryMap = {}

 const mapChildCategoryIdsToNames = categories => {
 categories.map(category => {
 if (category?.children?.length) {
 for (const childCategory of category.children) {
 if (childCategory.categoryId) {
 categoryMap[childCategory.categoryId] = childCategory.name
 }
 }
 }
 })

 return categoryMap
 }

 const mappedCategories = mapChildCategoryIdsToNames(categories)

 const assignVtexCategoryId = product => product?.categories?.map(productCategoryId => {
 if (productCategoryId in mappedCategories) {
 if (mappedCategories[productCategoryId] in vtexCategoriesMap) {
 product.vtexCategoryId = vtexCategoriesMap[mappedCategories[productCategoryId]]
 }
 }
 })

 const fields = [
 'id',
 'sku',
 'parentSku',
 'productId',
 'typeId',
 'draft',
 'vtexCategoryId',
 'title',
 'description',
 'simpleDescription',
 'metaDescription',
 'metaTitle',
 'shortDescription',
 'howToUse',
 'ingredients.fullIngredients',
 'ingredients.activeIngredients',
 'ingredients.afterIngredients',
 'ingredients.keyIngredients',
 'image.altText',
 'image.imageUrl',
 'image.bundledSkuInterruptImageUrl',
 'image.bundledSkuInterruptImageAltText',
 'safetyFirstMessage',
 'barcode',
 'inStock',
 'certifications',
 'isShippable',
 'price',
 'specialPrice',
 'specialPriceFrom',
 'specialPriceTo',
 'CV',
 'PV',
 'QV',
 'SV',
 'hostValue',
 'flags',
 'widgets',
 'hideFromEnrollingConsultant',
 'visibility',
 'bestFor',
 'bestSeller',
 'barcode',
 'categories',
 'parentCategoryIds',
 'positions',
 'doNotShipAlone',
 'googleProductCategory',
 'handle',
 'hideFromEnrollingConsultant',
 'includeInProductFeed',
 'isGWP',
 'maxQuantity',
 'metaDescription',
 'recyclingInfo',
 'newFrom',
 'newTo',
 'notCrawlable',
 'disableProductDetailPage',
 'preOrder',
 'preOrderConsultant',
 'stockNotify',
 'taxClass',
 'upSellIds',
 'swatches.colorHexCode',
 'swatches.position',
 'swatches.swatchlabel',
 'productVolume',
 'size',
 'weight',
 'galleryImages',
 'isFinalSaleConfig',
 'isVirtual',
 'autoshipEligible',
 'autoshipFrequency',
 'autoshipPeriod',
 'altPromotion',
 'productVariety',
 'information.info',
 'information.infoList',
 'enrollmentLabel',
 'enrollmentValue',
 'video.videoLink',
 'altVideo'
 ];

 const options = { fields };

 const parser = new Parser(options);

 const productsForExport = [];

 products.map(product => {
 const allVariantsDisabled = (product.variants && product.variants.every(variant => variant.draft === true))

 if (product.draft === false || (product.draft === false && !allVariantsDisabled)) {
 const { variants, visibility, flags } = product;

 if (product.image && product.image.gallery && product.image.gallery.length) {
 product.galleryImages = product.image.gallery.map(galleryImage => `sortOrder: ${galleryImage.sortOrder}, url: ${galleryImage.url}`)
 }

 if (product.information && product.information.infoList && product.information.infoList.length) {
 product.information.infoList = product.information.infoList.map(infoListEntry => `ordinal: ${infoListEntry.ordinal}, lineInfo: ${infoListEntry.lineInfo}`)
 }

 product.enrollmentLabel = product.label
 product.enrollmentValue = product.value

 assignVtexCategoryId(product)

 productsForExport.push(product);

 if (variants && variants.length) {
 variants.map(variant => {
 if (variant.draft === false) {
 productsForExport.push({
 ...variant,
 flags,
 visibility,
 parentSku: product.sku
 })
 }
 });
 }
 }
 });

 const csv = parser.parse(productsForExport);

 console.info(csv)
})()
다음 코드를 설명해 주세요:

'App/constants/collections'에서 { CATEGORIES\_EN\_US, PRODUCTS\_EN\_US }를 임포트합니다.
'App/utils/firestore'에서 { getCollection }을 가져옵니다.
'json2csv'에서 { Parser }를 가져옵니다;

(async () => {
 const products = await getCollection({
 collection: products\_en\_us
 })

 const categories = await getCollection({
 collection: CATEGORIES\_EN\_US
 })

 const vtexCategoriesMap = {
 '세럼 & 트리트먼트': 1200,
 'Masks': 1300,
 'Cleansers': 1400,
 '에센스 & 토너': 1500,
 '아이 케어': 1600,
 '페이스 오일': 1700,
 '얼굴': 2100,
 '눈': 2200,
 '입술': 2300,
 '메이크업 리무버': 2400,
 '모이스처라이저': 3100,
 '바디워시 & 스크럽': 3200,
 '헤어 케어': 3300,
 '자외선 차단제': 3400,
 '핸드 케어': 3500
 }

 let categoryMap = {}

 const mapChildCategoryIdsToNames = categories => {}
 categories.map(category => {
 if (category?.children?.length) {
 for (const childCategory of category.children) {
 if (childCategory.categoryId) {
 categoryMap[childCategory.categoryId] = childCategory.name
 }
 }
 }
 })

 반환 카테고리맵
 }

 const mappedCategories = mapChildCategoryIdsToNames(categories)

 const assignVtexCategoryId = product => product?.categories?.map(productCategoryId => {
 if (mappedCategories에 productCategoryId) { {
 if (mappedCategories[productCategoryId] in vtexCategoriesMap) { {
 product.vtexCategoryId = vtexCategoriesMap[mappedCategories[productCategoryId]]]
 }
 }
 })

 const fields = [
 'id',
 'sku',
 'parentSku',
 'productId',
 'typeId',
 'draft',
 'vtexCategoryId',
 'title',
 '설명',
 '간단한 설명',
 '메타설명',
 '메타타이틀',
 'shortDescription',
 'howToUse',
 'ingredients.fullIngredients',
 'ingredients.activeIngredients',
 'ingredients.afterIngredients',
 'ingredients.keyIngredients',
 'image.altText',
 'image.imageUrl',
 'image.bundledSkuInterruptImageUrl',
 'image.bundledSkuInterruptImageAltText',
 '안전제일메시지',
 '바코드',
 'inStock',
 '인증',
 'isShippable',
 'price',
 '특별가격',
 'specialPriceFrom',
 'specialPriceTo',
 'CV',
 'PV',
 'QV',
 'SV',
 'hostValue',
 'flags',
 '위젯',
 'hideFromEnrollingConsultant',
 '가시성',
 'bestFor',
 '베스트셀러',
 '바코드',
 '카테고리',
 '부모 카테고리 아이디',
 'positions',
 'doNotShipAlone',
 '구글제품카테고리',
 'handle',
 'hideFromEnrollingConsultant',
 '포함상품피드',
 'isGWP',
 '최대수량',
 '메타설명',
 '재활용정보',
 'newFrom',
 'newTo',
 'notCrawlable',
 'disableProductDetailPage',
 'preOrder',
 'preOrderConsultant',
 'stockNotify',
 'taxClass',
 'upSellIds',
 'swatches.colorHexCode',
 'swatches.position',
 'swatches.swatchlabel',
 'productVolume',
 'size',
 'weight',
 'galleryImages',
 'isFinalSaleConfig',
 'isVirtual',
 'autoshipEligible',
 '자동배송빈도',
 '자동배송기간',
 'altPromotion',
 '제품종류',
 'information.info',
 '정보.정보목록',
 '등록라벨',
 '등록값',
 'video.videoLink',
 'altVideo'
 ];

 const options = { fields };

 const 파서 = 새로운 파서(옵션);

 const productsForExport = [];

 products.map(product => {
 const allVariantsDisabled = (product.variants && product.variants.every(variant => variant.draft === true))

 if (product.draft === false || (product.draft === false && !allVariantsDisabled)) {
 const { variants, 가시성, 플래그 } = product;

 if (product.image && product.image.gallery && product.image.gallery.length) {
 product.galleryImages = product.image.gallery.map(galleryImage => `sortOrder: ${galleryImage.sortOrder}, url: ${galleryImage.url}`)
 }

 if (product.information && product.information.infoList && product.information.infoList.length) {
 product.information.infoList = product.information.infoList.map(infoListEntry => `서수: ${infoListEntry.ordinal}, lineInfo: ${infoListEntry.lineInfo}`)
 }

 제품.등록라벨 = 제품.라벨
 product.enrollmentValue = 제품.값

 할당V텍스카테고리아이디(제품)

 productsForExport.push(product);

 if (variants && variants.length) {
 variants.map(variant => {
 if (variant.draft === false) {
 productsForExport.push({
 ...variant,
 flags,
 가시성,
 parentSku: product.sku
 })
 }
 });
 }
 }
 });

 const csv = parser.parse(productsForExport);

 콘솔.정보(csv)
})()