✨ JSON 配置仅存储用户差异并与最新默认配置合并

src/pkg/config/config.test.ts

@@ -1,6 +1,8 @@
 import { describe, expect, it, beforeEach, afterEach, vi } from "vitest";
 import { SystemConfig } from "./config";
 import { MessageQueue } from "@Packages/message/message_queue";
+import { defaultConfig as eslintDefaultConfig } from "@Packages/eslint/linter-config";
+import { defaultConfig as editorDefaultConfig } from "@App/pkg/utils/monaco-editor/config";
 
 describe("SystemConfig 双 storage 与懒迁移", () => {
   let mq: MessageQueue;
@@ -296,6 +298,106 @@ describe("SystemConfig 双 storage 与懒迁移", () => {
     });
   });
 
+  describe("JSON 配置的稀疏存储与默认值合并", () => {
+    it("未修改时应返回最新默认配置", async () => {
+      await expect(config.getEslintConfig()).resolves.toBe(eslintDefaultConfig);
+      await expect(config.getEditorConfig()).resolves.toBe(editorDefaultConfig);
+    });
+
+    it("保存时应只存储与默认配置的差异", async () => {
+      const modified = JSON.parse(eslintDefaultConfig);
+      modified.rules["no-debugger"] = ["warn"];
+      modified.rules["custom/added-rule"] = ["error"];
+      config.setEslintConfig(JSON.stringify(modified));
+
+      await vi.waitFor(async () => {
+        const syncData = await chrome.storage.sync.get("system_eslint_config");
+        expect(JSON.parse(syncData["system_eslint_config"] as string)).toEqual({
+          format: "scriptcat-json-overrides",
+          version: 1,
+          overrides: { rules: { "no-debugger": ["warn"], "custom/added-rule": ["error"] } },
+        });
+      });
+    });
+
+    it("读取时应将存储的差异合并到最新默认配置", async () => {
+      await chrome.storage.sync.set({
+        system_eslint_config: JSON.stringify({
+          format: "scriptcat-json-overrides",
+          version: 1,
+          overrides: { rules: { "no-debugger": ["warn"] } },
+        }),
+      });
+
+      const result = JSON.parse(await new SystemConfig(new MessageQueue()).getEslintConfig());
+      const defaults = JSON.parse(eslintDefaultConfig);
+      expect(result.rules["no-debugger"]).toEqual(["warn"]);
+      expect(result.rules["no-empty"]).toEqual(defaults.rules["no-empty"]);
+      expect(result.globals).toEqual(defaults.globals);
+    });
+
+    it("旧版全量配置应自动获得新默认字段且保留用户改动", async () => {
+      // 模拟旧版本存储的全量 JSON：缺少后续新增的默认规则，且用户改过其中一条
+      const legacy = JSON.parse(eslintDefaultConfig);
+      legacy.rules["no-debugger"] = ["off"];
+      delete legacy.rules["no-empty"];
+      await chrome.storage.sync.set({ system_eslint_config: JSON.stringify(legacy) });
+
+      const result = JSON.parse(await new SystemConfig(new MessageQueue()).getEslintConfig());
+      expect(result.rules["no-debugger"]).toEqual(["off"]);
+      // 新增的默认规则应自动生效
+      expect(result.rules["no-empty"]).toEqual(JSON.parse(eslintDefaultConfig).rules["no-empty"]);
+
+      const stored = await chrome.storage.sync.get("system_eslint_config");
+      expect(JSON.parse(stored["system_eslint_config"] as string)).toEqual({
+        format: "scriptcat-json-overrides",
+        version: 1,
+        overrides: { rules: { "no-debugger": ["off"] } },
+      });
+    });
+
+    it("保存与默认配置一致的内容时应清除存储", async () => {
+      // 使用紧凑格式，验证差异按语义比较而非字符串比较
+      config.setEslintConfig(JSON.stringify(JSON.parse(eslintDefaultConfig)));
+
+      await vi.waitFor(async () => {
+        const syncData = await chrome.storage.sync.get("system_eslint_config");
+        expect(syncData["system_eslint_config"]).toBeUndefined();
+      });
+      // 重新读取（新实例，不走缓存）应返回默认配置
+      await expect(new SystemConfig(new MessageQueue()).getEslintConfig()).resolves.toBe(eslintDefaultConfig);
+    });
+
+    it("保存空字符串应恢复默认配置", async () => {
+      config.setEslintConfig(JSON.stringify({ rules: { "no-debugger": ["warn"] } }));
+      config.setEslintConfig("");
+
+      await vi.waitFor(async () => {
+        const syncData = await chrome.storage.sync.get("system_eslint_config");
+        expect(syncData["system_eslint_config"]).toBeUndefined();
+      });
+      await expect(config.getEslintConfig()).resolves.toBe(eslintDefaultConfig);
+    });
+
+    it("editor_config 同样只存储差异并合并读取", async () => {
+      const modified = JSON.parse(editorDefaultConfig);
+      modified.strict = false;
+      config.setEditorConfig(JSON.stringify(modified));
+
+      await vi.waitFor(async () => {
+        const syncData = await chrome.storage.sync.get("system_editor_config");
+        expect(JSON.parse(syncData["system_editor_config"] as string)).toEqual({
+          format: "scriptcat-json-overrides",
+          version: 1,
+          overrides: { strict: false },
+        });
+      });
+
+      const result = JSON.parse(await new SystemConfig(new MessageQueue()).getEditorConfig());
+      expect(result).toEqual({ ...JSON.parse(editorDefaultConfig), strict: false });
+    });
+  });
+
   describe("React 外部存储适配器", () => {
     it("同一配置键应返回稳定的 store 实例", () => {
       expect(config.externalStore("favicon_service")).toBe(config.externalStore("favicon_service"));

src/pkg/config/config.ts

@@ -9,6 +9,8 @@ import defaultTypeDefinition from "@App/template/scriptcat.d.tpl";
 import { toCamelCase } from "../utils/utils";
 import EventEmitter from "eventemitter3";
 import { STORAGE_LOCAL_KEYS } from "./consts";
+import { decodeJsonConfig, diffJsonConfig, type DecodedJsonConfig } from "./json_overrides";
+import { legacyJsonConfigDefaults } from "./json_config_legacy_defaults";
 
 export const SystemConfigChange = "systemConfigChange";
 
@@ -170,6 +172,11 @@ interface SystemConfigEntry {
   store?: unknown;
 }
 
+interface JsonConfigDefault {
+  current: string;
+  legacy: string;
+}
+
 type GetterFn<T extends SystemConfigKey> = (
   ...args: any[]
 ) => Promise<SystemConfigValueType<T>> | SystemConfigValueType<T>;
@@ -195,6 +202,31 @@ export class SystemConfig {
   // 设备相关的配置项，使用 chrome.storage.local（不跨设备同步）
   private readonly localStorage = new ChromeStorage("system", false);
 
+  // JSON 配置项的默认配置：storage 只保存与默认配置的稀疏差异，
+  // 缓存与消息广播中始终是合并后的完整配置（#1517）
+  private readonly jsonConfigDefaults: Partial<Record<SystemConfigKey, JsonConfigDefault>> = {
+    eslint_config: { current: defaultConfig, legacy: legacyJsonConfigDefaults.eslint_config },
+    editor_config: { current: editorDefaultConfig, legacy: legacyJsonConfigDefaults.editor_config },
+  };
+
+  // 读取解码：将存储的用户差异合并到最新默认配置
+  private decodeStored(key: SystemConfigKey, stored: unknown): DecodedJsonConfig | { value: unknown } {
+    const defaults = this.jsonConfigDefaults[key];
+    if (defaults !== undefined && typeof stored === "string") {
+      return decodeJsonConfig(defaults.current, defaults.legacy, stored);
+    }
+    return { value: stored };
+  }
+
+  // 写入编码：只保存与默认配置的差异，完全一致时返回 undefined（清除存储）
+  private encodeForStorage(key: SystemConfigKey, value: unknown): unknown {
+    const defaults = this.jsonConfigDefaults[key];
+    if (defaults !== undefined && typeof value === "string") {
+      return diffJsonConfig(defaults.current, value);
+    }
+    return value;
+  }
+
   private isLocalKey(key: string): boolean {
     return STORAGE_LOCAL_KEYS.has(key);
   }
@@ -286,6 +318,17 @@ export class SystemConfig {
     return syncVal as T;
   }
 
+  private migrateStored(key: SystemConfigKey, value: string | undefined): Promise<void> {
+    const entry = this.cacheEntry(key);
+    const storage = this.getStorage(key);
+    const persist = () => (value === undefined ? storage.remove(key) : storage.set(key, value));
+    const asyncOp = entry.pendingWrite ? entry.pendingWrite.then(persist, persist) : persist();
+    entry.pendingWrite = asyncOp;
+    return asyncOp.then(() => {
+      if (entry.pendingWrite === asyncOp) entry.pendingWrite = undefined;
+    });
+  }
+
   private _get<T extends string | number | boolean | object>(
     key: SystemConfigKey,
     defaultValue: WithAsyncValue<Exclude<T, undefined>>
@@ -297,14 +340,23 @@ export class SystemConfig {
     }
     const version = entry.version;
     const storage = this.getStorage(key);
-    return storage.get(key).then((val) => {
+    return storage.get(key).then(async (val) => {
       if (version !== entry.version) {
         return entry.hasValue && entry.value !== undefined ? (entry.value as T) : this.resolveDefault<T>(defaultValue);
       }
       if (val !== undefined) {
+        const decoded = this.decodeStored(key, val);
+        if ("migration" in decoded && decoded.migration) {
+          await this.migrateStored(key, decoded.migration.value);
+          if (version !== entry.version) {
+            return entry.hasValue && entry.value !== undefined
+              ? (entry.value as T)
+              : this.resolveDefault<T>(defaultValue);
+          }
+        }
         entry.hasValue = true;
-        entry.value = val;
-        return val as T;
+        entry.value = decoded.value;
+        return decoded.value as T;
       }
       // 对 local key，回退读取 sync storage（兼容旧版本数据迁移）
       if (this.isLocalKey(key)) {
@@ -334,14 +386,13 @@ export class SystemConfig {
     entry.version += 1;
     const writeVersion = entry.version;
     const storage = this.getStorage(key);
-    const persist = () => (value === undefined ? storage.remove(key) : storage.set(key, value));
-    if (value === undefined) {
-      entry.hasValue = true;
-      entry.value = undefined;
-    } else {
-      entry.hasValue = true;
-      entry.value = value;
-    }
+    const persist = () => {
+      if (value === undefined) return storage.remove(key);
+      const stored = this.encodeForStorage(key, value);
+      return stored === undefined ? storage.remove(key) : storage.set(key, stored);
+    };
+    entry.hasValue = true;
+    entry.value = value;
     // 同一配置键可能在输入框逐字编辑时被高频写入。chrome.storage 的异步回调
     // 不保证多次并发写入按调用顺序完成，旧写入后完成会把新值覆盖掉；按键串行化
     // 持久化可确保最终落盘值与内存中的最新快照一致，不影响不同配置键并行保存。
@@ -485,8 +536,7 @@ export class SystemConfig {
 
   setEslintConfig(v: string) {
     if (v === "") {
-      this._set("eslint_config", defaultConfig);
-      return;
+      v = defaultConfig;
     }
     JSON.parse(v);
     return this._set("eslint_config", v);
@@ -498,8 +548,7 @@ export class SystemConfig {
 
   setEditorConfig(v: string) {
     if (v === "") {
-      this._set("editor_config", editorDefaultConfig);
-      return;
+      v = editorDefaultConfig;
     }
     JSON.parse(v);
     return this._set("editor_config", v);