Fix: Compare action should update its original comment instead of a n…

…ew comment (#6736)

.github/compare-assets/index.js

@@ -51,7 +51,45 @@ const runner = async () => {
 				.filter( Boolean )
 		);
 
+		let reportCommentId;
+
+		{
+			const currentComments = await octokit.rest.issues.listComments( {
+				owner,
+				repo,
+				issue_number: payload.pull_request.number,
+			} );
+
+			if (
+				Array.isArray( currentComments.data ) &&
+				currentComments.data.length > 0
+			) {
+				const comment = currentComments.data.find(
+					( comment ) =>
+						comment.body.includes( 'Script Dependencies Report' ) &&
+						comment.user.login === 'github-actions[bot]'
+				);
+
+				if ( comment ) {
+					reportCommentId = comment.id;
+				}
+			}
+		}
+
 		if ( Object.keys( changes ).length === 0 ) {
+			if ( reportCommentId ) {
+				await octokit.rest.issues.updateComment( {
+					owner,
+					repo,
+					comment_id: reportCommentId,
+					body:
+						'# Script Dependencies Report' +
+						'\n\n' +
+						'There is no changed script dependency between this branch and trunk.' +
+						'\n\n' +
+						'__This comment was automatically generated by the `./github/compare-assets` action.__',
+				} );
+			}
 			return;
 		}
 
@@ -82,24 +120,35 @@ const runner = async () => {
 			}
 		);
 
-		await octokit.rest.issues.createComment( {
-			owner,
-			repo,
-			issue_number: payload.pull_request.number,
-			body:
-				'# Script Dependencies Report' +
-				'\n\n' +
-				'The `compare-assets` action has detected some changed script dependencies between this branch and ' +
-				'trunk. Please review and confirm the following are correct before merging.' +
-				'\n\n' +
-				'| Script Handle | Added | Removed |    |' +
-				'\n' +
-				'| ------------- | ------| ------- | -- |' +
-				'\n' +
-				reportContent +
-				'\n\n' +
-				'__This comment was automatically generated by the `./github/compare-assets` action.__',
-		} );
+		const commentBody =
+			'# Script Dependencies Report' +
+			'\n\n' +
+			'The `compare-assets` action has detected some changed script dependencies between this branch and ' +
+			'trunk. Please review and confirm the following are correct before merging.' +
+			'\n\n' +
+			'| Script Handle | Added | Removed |    |' +
+			'\n' +
+			'| ------------- | ------| ------- | -- |' +
+			'\n' +
+			reportContent +
+			'\n\n' +
+			'__This comment was automatically generated by the `./github/compare-assets` action.__';
+
+		if ( reportCommentId ) {
+			await octokit.rest.issues.updateComment( {
+				owner,
+				repo,
+				comment_id: reportCommentId,
+				body: commentBody,
+			} );
+		} else {
+			await octokit.rest.issues.createComment( {
+				owner,
+				repo,
+				issue_number: payload.pull_request.number,
+				body: commentBody,
+			} );
+		}
 	} catch ( error ) {
 		setFailed( error.message );
 	}