wip lazy loading luxon on models.js

searchlib/lib/models.js

@@ -1,5 +1,4 @@
 import registry from '@eeacms/search/registry';
-import { DateTime } from 'luxon';
 
 function getHighlight(hit, fieldName) {
   if (
@@ -116,39 +115,53 @@ export class BasicModel {
 }
 
 export class ResultModel extends BasicModel {
+  constructor(record, config, field_filters) {
+    super(record, config, field_filters);
+    this._getDateTime = this._getDateTime.bind(this);
+  }
+
+  async _getDateTime() {
+    if (!this._DateTime) {
+      const { DateTime } = await import('luxon');
+      this._DateTime = DateTime;
+    }
+    return this._DateTime;
+  }
+
+  async _getDateTimeValue(fieldName) {
+    const DateTime = await this._getDateTime();
+    const raw = this._result[fieldName]?.raw;
+    return raw ? DateTime.fromISO(raw) : null;
+  }
+
+  async _getDaysSinceIssued() {
+    const DateTime = await this._getDateTime();
+    const issued = (await this._getDateTimeValue('issued')) ?? DateTime.local();
+    return DateTime.local().diff(issued, 'days').as('days');
+  }
+
   get daysSinceIssued() {
-    const raw = this._result['issued']?.raw;
-    const issued = raw ? DateTime.fromISO(raw) : DateTime.local();
-    const res = DateTime.local().diff(issued, 'days').as('days');
-    return res;
+    return this._getDaysSinceIssued();
   }
 
   get id() {
     return this.id?.raw;
   }
 
   get isNew() {
-    const raw = this._result['issued']?.raw;
-    const issued = raw ? DateTime.fromISO(raw) : DateTime.local();
-    const res = DateTime.local().diff(issued, 'days').as('days');
-
-    return res < 30;
+    return this._getDaysSinceIssued().then(
+      (daysSinceIssued) => daysSinceIssued < 30,
+    );
   }
 
   get issued() {
-    const raw = this._result['issued']?.raw;
-    return raw ? DateTime.fromISO(raw) : null;
+    return this._getDateTimeValue('issued');
   }
 
   get expires() {
-    const raw = this._result['expires']?.raw;
-    return raw ? DateTime.fromISO(raw) : null;
+    return this._getDateTimeValue('expires');
   }
 
-  // get isExpired() {
-  //   return this.expires ? this.expires < DateTime.local() : false;
-  // }
-
   get isExpired() {
     return this._result?.['expires']?.raw
       ? Date.parse(this._result['expires']?.raw) < Date.now()