Merge pull request #19 from exoego/fix-diff

Fix diff calculation

src/compare.ts

@@ -28,15 +28,20 @@ This analysis was generated by [esbuild-bundle-analyzer](https://github.com/exoe
 
 		if (!currentStats) {
 			hasAnyChange = true;
-			return { ...baseStats, diff: -1, remark: "deleted", tree: undefined };
+			return {
+				...baseStats,
+				baseBytes: -1,
+				remark: "deleted",
+				tree: undefined,
+			};
 		}
 
 		const tree = fileTree.get(
 			treeKey(currentStats.metafile, currentStats.outfile),
 		);
 		if (!baseStats) {
 			hasAnyChange = true;
-			return { ...currentStats, diff: -1, remark: "added", tree };
+			return { ...currentStats, baseBytes: -1, remark: "added", tree };
 		}
 
 		const diff = currentStats.bytes - baseStats.bytes;
@@ -45,7 +50,7 @@ This analysis was generated by [esbuild-bundle-analyzer](https://github.com/exoe
 		}
 		return {
 			...currentStats,
-			diff,
+			baseBytes: baseStats.bytes,
 			tree,
 			remark: Math.sign(diff) ? "increased" : "decreased",
 		};
@@ -322,10 +327,11 @@ function renderNote(d: CompareResult, redThreshold: number): string {
 	if (d.remark === "added") {
 		return "🆕 Added";
 	}
-	if (d.diff) {
-		const percentChange = (d.diff / d.bytes) * 100;
+	const diff = d.bytes - d.baseBytes;
+	if (diff !== 0) {
+		const percentChange = (diff / d.baseBytes) * 100;
 		return `${renderStatusIndicator(percentChange, redThreshold)}${filesize(
-			d.diff,
+			diff,
 		)} (${sign(percentChange)}${percentChange.toFixed(1)}%)`;
 	}
 	return "✅  No change";

src/types.ts

@@ -9,7 +9,7 @@ export interface CompareResult {
 	metafile: string;
 	outfile: string;
 	bytes: number;
-	diff: number;
+	baseBytes: number;
 	remark: "added" | "deleted" | "increased" | "decreased";
 	tree: TreeMapNode | undefined;
 }