diff --git a/src/models/articles.model.js b/src/models/articles.model.js
index 5aea1317..178f54c1 100644
--- a/src/models/articles.model.js
+++ b/src/models/articles.model.js
@@ -16,14 +16,14 @@ const { getRegionCoordinatesFromDocument } = require('../util/solr')
 
 const { getExternalFragment } = require('../hooks/iiif')
 
-const ACCESS_RIGHT_NOT_SPECIFIED = 'na'
-const ACCESS_RIGHT_OPEN_PRIVATE = 'OpenPrivate'
-const ACCESS_RIGHT_CLOSED = 'Closed'
-const ACCESS_RIGHT_OPEN_PUBLIC = 'OpenPublic'
+export const ACCESS_RIGHT_NOT_SPECIFIED = 'na'
+export const ACCESS_RIGHT_OPEN_PRIVATE = 'OpenPrivate'
+export const ACCESS_RIGHT_CLOSED = 'Closed'
+export const ACCESS_RIGHT_OPEN_PUBLIC = 'OpenPublic'
 
-const ARTICLE_SOLR_FL_MINIMAL = ['id', 'item_type_s', 'doc_type_s']
+export const ARTICLE_SOLR_FL_MINIMAL = ['id', 'item_type_s', 'doc_type_s']
 
-const ARTICLE_SOLR_FL_LIST_ITEM = [
+export const ARTICLE_SOLR_FL_LIST_ITEM = [
   'id',
   'lg_s', // 'fr',
   'title_txt_fr',
@@ -65,7 +65,7 @@ const ARTICLE_SOLR_FL_LIST_ITEM = [
   'rights_bm_get_img_l',
 ]
 
-const ARTICLE_SOLR_FL_LITE = [
+export const ARTICLE_SOLR_FL_LITE = [
   'id',
   'lg_s', // 'fr',
   'content_txt_fr',
@@ -98,7 +98,7 @@ const ARTICLE_SOLR_FL_LITE = [
   'loc_entities_dpfs',
 ]
 
-const ARTICLE_SOLR_FL_TO_CSV = [
+export const ARTICLE_SOLR_FL_TO_CSV = [
   'id',
   'lg_s', // 'fr',
 
@@ -125,9 +125,9 @@ const ARTICLE_SOLR_FL_TO_CSV = [
   'loc_entities_dpfs',
 ]
 
-const ARTICLE_SOLR_FL_SEARCH = ARTICLE_SOLR_FL_LITE.concat(['pp_plain:[json]'])
+export const ARTICLE_SOLR_FL_SEARCH = ARTICLE_SOLR_FL_LITE.concat(['pp_plain:[json]'])
 
-const ARTICLE_SOLR_FL = ARTICLE_SOLR_FL_LITE.concat([
+export const ARTICLE_SOLR_FL = ARTICLE_SOLR_FL_LITE.concat([
   'lb_plain:[json]',
   'rb_plain:[json]',
   'pp_plain:[json]',
@@ -188,7 +188,7 @@ class ArticleMatch extends Fragment {
   }
 }
 
-class BaseArticle {
+export class BaseArticle {
   constructor({
     uid = '',
     type = '',
@@ -758,19 +758,6 @@ class Article extends BaseArticle {
   }
 }
 
-// module.exports.SequelizeFactory = model;
-module.exports = Article
-module.exports.solrFactory = Article.solrFactory
-module.exports.Model = Article
-module.exports.BaseArticle = BaseArticle
-module.exports.ARTICLE_SOLR_FL = ARTICLE_SOLR_FL
-module.exports.ARTICLE_SOLR_FL_LITE = ARTICLE_SOLR_FL_LITE
-module.exports.ARTICLE_SOLR_FL_SEARCH = ARTICLE_SOLR_FL_SEARCH
-module.exports.ARTICLE_SOLR_FL_LIST_ITEM = ARTICLE_SOLR_FL_LIST_ITEM
-module.exports.ARTICLE_SOLR_FL_TO_CSV = ARTICLE_SOLR_FL_TO_CSV
-module.exports.ARTICLE_SOLR_FL_MINIMAL = ARTICLE_SOLR_FL_MINIMAL
-
-module.exports.ACCESS_RIGHT_NOT_SPECIFIED = ACCESS_RIGHT_NOT_SPECIFIED
-module.exports.ACCESS_RIGHT_OPEN_PRIVATE = ACCESS_RIGHT_OPEN_PRIVATE
-module.exports.ACCESS_RIGHT_CLOSED = ACCESS_RIGHT_CLOSED
-module.exports.ACCESS_RIGHT_OPEN_PUBLIC = ACCESS_RIGHT_OPEN_PUBLIC
+export default Article
+export const solrFactory = Article.solrFactory
+export const Model = Article
diff --git a/src/services/articles/articles.class.ts b/src/services/articles/articles.class.ts
index 16a59017..67804f38 100644
--- a/src/services/articles/articles.class.ts
+++ b/src/services/articles/articles.class.ts
@@ -4,7 +4,7 @@ import { Op } from 'sequelize'
 import { NotFound } from '@feathersjs/errors'
 
 import initSequelizeService, { Service as SequelizeService } from '../sequelize.service'
-import Article from '../../models/articles.model'
+import Article, { ARTICLE_SOLR_FL_LIST_ITEM } from '../../models/articles.model'
 import Issue from '../../models/issues.model'
 import { measureTime } from '../../util/instruments'
 import { ImpressoApplication } from '../../types'
@@ -85,7 +85,7 @@ export class Service {
   }
 
   async _find(params: FindOptions) {
-    const fl = Article.ARTICLE_SOLR_FL_LIST_ITEM
+    const fl = ARTICLE_SOLR_FL_LIST_ITEM
     const pageUids = (params.query.filters || []).filter(d => d.type === 'page').map(d => d.q)
 
     debug('[find] use auth user:', params.user ? params.user.uid : 'no user')
@@ -148,7 +148,7 @@ export class Service {
           article.pages = addonsIndex[article.uid].pages.map((d: any) => (d.constructor === Object ? d : d.toJSON()))
         }
         if (pageUids.length === 1) {
-          article.regions = article?.regions?.filter(r => pageUids.indexOf(r.pageUid) !== -1)
+          article.regions = article?.regions?.filter((r: { pageUid: string }) => pageUids.indexOf(r.pageUid) !== -1)
         }
         article.assignIIIF()
         return article
@@ -158,7 +158,7 @@ export class Service {
 
   async get(id: string, params: any) {
     debug(`[get:${id}] with auth params:`, params.user ? params.user.uid : 'no user found')
-    const fl = Article.ARTICLE_SOLR_FL_LIST_ITEM.concat([
+    const fl = ARTICLE_SOLR_FL_LIST_ITEM.concat([
       'lb_plain:[json]',
       'rb_plain:[json]',
       'pp_plain:[json]',