SF-3163a Forward compatibility with the upcoming draft source arrays

src/SIL.XForge.Scripture/ClientApp/src/app/translate/draft-generation/draft-utils.ts

@@ -1,6 +1,7 @@
 import { SFProjectProfile } from 'realtime-server/lib/esm/scriptureforge/models/sf-project';
 import { TranslateSource } from 'realtime-server/lib/esm/scriptureforge/models/translate-config';
 import language_code_mapping from '../../../../../language_code_mapping.json';
+import { hasArrayProp } from '../../../type-utils';
 import { SelectableProjectWithLanguageCode } from '../../core/paratext.service';
 
 /** Represents draft sources as a set of two {@link TranslateSource} arrays, and one {@link SFProjectProfile} array. */
@@ -70,6 +71,16 @@ export function projectToDraftSources(project: SFProjectProfile): DraftSourcesAs
   const draftingSources: TranslateSource[] & ({ length: 0 } | { length: 1 }) = [];
   const trainingTargets: [SFProjectProfile] = [project];
   const draftConfig = project.translateConfig.draftConfig;
+  // Forward compatibility with the upcoming SF-3163 change to allow draft sources as arrays
+  if (
+    hasArrayProp(project.translateConfig.draftConfig, 'trainingSources') &&
+    hasArrayProp(project.translateConfig.draftConfig, 'draftingSources')
+  ) {
+    const trainingSources: TranslateSource[] = [...project.translateConfig.draftConfig.trainingSources] as any[];
+    const draftingSources: TranslateSource[] = [...project.translateConfig.draftConfig.draftingSources] as any[];
+    const trainingTargets: SFProjectProfile[] = [project];
+    return { trainingSources, trainingTargets, draftingSources };
+  }
   let trainingSource: TranslateSource | undefined;
   if (draftConfig.alternateTrainingSourceEnabled && draftConfig.alternateTrainingSource != null) {
     trainingSource = draftConfig.alternateTrainingSource;

src/SIL.XForge.Scripture/ClientApp/src/type-utils.ts

@@ -24,6 +24,10 @@ export function hasProp<X, Y extends PropertyKey>(value: X, property: Y): value
   return (isObj(value) || isFn(value)) && property in value;
 }
 
+export function hasArrayProp<X, Y extends PropertyKey>(value: X, property: Y): value is X & Record<Y, unknown[]> {
+  return hasProp(value, property) && Array.isArray(value[property]);
+}
+
 export function hasStringProp<X, Y extends PropertyKey>(value: X, property: Y): value is X & Record<Y, string> {
   return hasProp(value, property) && typeof value[property] === 'string';
 }