make campaign an enumeration of strings

Author: jivey

src/app/helpers/link.ts

@@ -50,7 +50,9 @@ function logoutLink() {
     return loginOrOutLink('logout');
 }
 
-function setUtmCampaign(url: string, campaign: string) {
+export type UtmCampaign = 'book-details' | 'subjects-dropdown';
+
+function setUtmCampaign(url: string, campaign: UtmCampaign) {
     try {
         const parsed = new URL(url);
 

src/app/pages/details/common/get-this-title-files/options.tsx

@@ -9,6 +9,7 @@ import {faCloudDownloadAlt} from '@fortawesome/free-solid-svg-icons/faCloudDownl
 import {faVolumeUp} from '@fortawesome/free-solid-svg-icons/faVolumeUp';
 import {faAmazon} from '@fortawesome/free-brands-svg-icons/faAmazon';
 import $ from '~/helpers/$';
+import {type UtmCampaign} from '~/helpers/link';
 import {treatSpaceOrEnterAsClick} from '~/helpers/events';
 import {useIntl, FormattedMessage} from 'react-intl';
 import OrderPrintCopy from './order-print-copy/order-print-copy';
@@ -197,7 +198,7 @@ export function PdfOption({model}: {model: Model}) {
     ) : null;
 }
 
-export function usePrintCopyDialog(campaign: string) {
+export function usePrintCopyDialog(campaign: UtmCampaign) {
     const [Dialog, open] = useDialog();
     const PCDialog = React.useCallback(
         ({text, slug}: {text: string; slug: string}) => (

src/app/pages/details/common/get-this-title-files/order-print-copy/order-print-copy.tsx

@@ -5,7 +5,7 @@ import {faUsers} from '@fortawesome/free-solid-svg-icons/faUsers';
 import {useIntl} from 'react-intl';
 import './order-print-copy.scss';
 import cmsFetch from '~/helpers/cms-fetch';
-import linkHelper from '~/helpers/link';
+import linkHelper, {type UtmCampaign} from '~/helpers/link';
 
 type Content = {
     headerText: string;
@@ -94,7 +94,7 @@ function useBookstoreContentLink(slug: string) {
     return url;
 }
 
-export default function OrderPrintCopy({slug, campaign}: {slug: string; campaign: string}) {
+export default function OrderPrintCopy({slug, campaign}: {slug: string; campaign: UtmCampaign}) {
     const {formatMessage} = useIntl();
     const bookstoreLink = useBookstoreContentLink(slug);
     const contentArray = React.useMemo(() => {