Fix the undefined type problem with api docgen for typescript files

Author: ingeniumed

packages/docgen/lib/get-export-entries.js

@@ -54,10 +54,10 @@ module.exports = ( token ) => {
 	}
 
 	const name = [];
-	if ( token.declaration === null ) {
+	if ( ! token.declaration ) {
 		token.specifiers.forEach( ( specifier ) =>
 			name.push( {
-				localName: specifier.local.name,
+				localName: specifier.local?.name,
 				exportName: specifier.exported.name,
 				module: token.source?.value ?? null,
 				lineStart: specifier.loc.start.line,

packages/docgen/test/get-export-entries.js

@@ -502,4 +502,30 @@ describe( 'Export entries', () => {
 			} ),
 		] );
 	} );
+
+	it( 're-exporting node module for external use', () => {
+		expect(
+			firstExport(
+				`
+				export * as Y from 'yjs';
+			`,
+				`
+				/**
+				 * Exports the entire API of Yjs.
+				 *
+				 * @module yjs
+				 */
+				export { Doc, Transaction, YArray as Array, YMap as Map, YText as Text, YXmlText as XmlText, YXmlHook as XmlHook, YXmlElement as XmlElement, YXmlFragment as XmlFragment, YXmlEvent, YMapEvent, YArrayEvent, YTextEvent, YEvent, Item, AbstractStruct, GC, Skip, ContentBinary, ContentDeleted, ContentDoc, ContentEmbed, ContentFormat, ContentJSON, ContentAny, ContentString, ContentType, AbstractType, getTypeChildren, createRelativePositionFromTypeIndex, createRelativePositionFromJSON, createAbsolutePositionFromRelativePosition, compareRelativePositions, AbsolutePosition, RelativePosition, ID, createID, compareIDs, getState, Snapshot, createSnapshot, createDeleteSet, createDeleteSetFromStructStore, cleanupYTextFormatting, snapshot, emptySnapshot, findRootTypeKey, findIndexSS, getItem, getItemCleanStart, getItemCleanEnd, typeListToArraySnapshot, typeMapGetSnapshot, typeMapGetAllSnapshot, createDocFromSnapshot, iterateDeletedStructs, applyUpdate, applyUpdateV2, readUpdate, readUpdateV2, encodeStateAsUpdate, encodeStateAsUpdateV2, encodeStateVector, UndoManager, decodeSnapshot, encodeSnapshot, decodeSnapshotV2, encodeSnapshotV2, decodeStateVector, logUpdate, logUpdateV2, decodeUpdate, decodeUpdateV2, relativePositionToJSON, isDeleted, isParentOf, equalSnapshots, PermanentUserData, tryGc, transact, AbstractConnector, logType, mergeUpdates, mergeUpdatesV2, parseUpdateMeta, parseUpdateMetaV2, encodeStateVectorFromUpdate, encodeStateVectorFromUpdateV2, encodeRelativePosition, decodeRelativePosition, diffUpdate, diffUpdateV2, convertUpdateFormatV1ToV2, convertUpdateFormatV2ToV1, obfuscateUpdate, obfuscateUpdateV2, UpdateEncoderV1, UpdateEncoderV2, UpdateDecoderV1, UpdateDecoderV2, equalDeleteSets, mergeDeleteSets, snapshotContainsUpdate } from "./internals.js";
+			`
+			)
+		).toEqual( [
+			expect.objectContaining( {
+				lineStart: 1,
+				lineEnd: 1,
+				localName: undefined,
+				exportName: 'Y',
+				module: 'yjs',
+			} ),
+		] );
+	} );
 } );