refactor(extensions): reuse shared helper primitives

extensions/diffs/src/config.test.ts

@@ -7,6 +7,23 @@ import {
   resolveDiffsPluginSecurity,
 } from "./config.js";
 
+const FULL_DEFAULTS = {
+  fontFamily: "JetBrains Mono",
+  fontSize: 17,
+  lineSpacing: 1.8,
+  layout: "split",
+  showLineNumbers: false,
+  diffIndicators: "classic",
+  wordWrap: false,
+  background: false,
+  theme: "light",
+  fileFormat: "pdf",
+  fileQuality: "hq",
+  fileScale: 2.6,
+  fileMaxWidth: 1280,
+  mode: "file",
+} as const;
+
 describe("resolveDiffsPluginDefaults", () => {
   it("returns built-in defaults when config is missing", () => {
     expect(resolveDiffsPluginDefaults(undefined)).toEqual(DEFAULT_DIFFS_TOOL_DEFAULTS);
@@ -15,39 +32,9 @@ describe("resolveDiffsPluginDefaults", () => {
   it("applies configured defaults from plugin config", () => {
     expect(
       resolveDiffsPluginDefaults({
-        defaults: {
-          fontFamily: "JetBrains Mono",
-          fontSize: 17,
-          lineSpacing: 1.8,
-          layout: "split",
-          showLineNumbers: false,
-          diffIndicators: "classic",
-          wordWrap: false,
-          background: false,
-          theme: "light",
-          fileFormat: "pdf",
-          fileQuality: "hq",
-          fileScale: 2.6,
-          fileMaxWidth: 1280,
-          mode: "file",
-        },
+        defaults: FULL_DEFAULTS,
       }),
-    ).toEqual({
-      fontFamily: "JetBrains Mono",
-      fontSize: 17,
-      lineSpacing: 1.8,
-      layout: "split",
-      showLineNumbers: false,
-      diffIndicators: "classic",
-      wordWrap: false,
-      background: false,
-      theme: "light",
-      fileFormat: "pdf",
-      fileQuality: "hq",
-      fileScale: 2.6,
-      fileMaxWidth: 1280,
-      mode: "file",
-    });
+    ).toEqual(FULL_DEFAULTS);
   });
 
   it("clamps and falls back for invalid line spacing and indicators", () => {