diff --git a/electron/main/index.ts b/electron/main/index.ts
index 7a31bf3..926f312 100644
--- a/electron/main/index.ts
+++ b/electron/main/index.ts
@@ -1,15 +1,12 @@
 import { app, BrowserWindow, ipcMain, shell } from "electron";
-import * as fs from "node:fs";
 import { createRequire } from "node:module";
 import os from "node:os";
 import path from "node:path";
 import { argv } from "node:process";
 import { fileURLToPath } from "node:url";
-import { type WorkspaceModel } from "../../src/contexts/workspace-context";
-import { VERSION, type FileVarDecl } from "../../src/misc/b3type";
+import { VERSION } from "../../src/misc/b3type";
 import * as b3util from "../../src/misc/b3util";
 import Path from "../../src/misc/path";
-import { readJson } from "../../src/misc/util";
 
 const require = createRequire(import.meta.url);
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
@@ -52,7 +49,6 @@ if (buildOutput || buildProject || buildHelp) {
     process.exit(1);
   }
   try {
-    let hasError = false;
     const project = Path.posixPath(buildProject!);
     const buildDir = Path.posixPath(buildOutput!);
     console.log("start build project:", project);
@@ -63,50 +59,7 @@ if (buildOutput || buildProject || buildHelp) {
     b3util.initWorkdir(workdir, (msg) => {
       console.error(`${msg}`);
     });
-    const settings = readJson<WorkspaceModel>(project).settings;
-    let buildScript: b3util.BuildScript | undefined;
-    if (settings.checkExpr) {
-      b3util.setCheckExpr(true);
-    }
-    if (settings.buildScript) {
-      const scriptPath = workdir + "/" + settings.buildScript;
-      try {
-        buildScript = eval(fs.readFileSync(scriptPath, "utf8"));
-      } catch (error) {
-        console.error(`'${scriptPath}' is not a valid build script`);
-      }
-    }
-    for (const path of Path.ls(Path.dirname(project), true)) {
-      if (path.endsWith(".json")) {
-        const buildpath = buildDir + "/" + path.substring(workdir.length + 1);
-        let tree = b3util.createBuildData(path);
-        if (buildScript) {
-          tree = b3util.processBatch(tree, path, buildScript);
-        }
-        if (!tree) {
-          continue;
-        }
-        if (tree.export === false) {
-          console.log("skip:", buildpath);
-          continue;
-        }
-        console.log("build:", buildpath);
-        const declare: FileVarDecl = {
-          import: tree.import.map((v) => ({ path: v, vars: [], depends: [] })),
-          declvar: tree.declvar.map((v) => ({ name: v.name, desc: v.desc })),
-          subtree: [],
-        };
-        b3util.refreshDeclare(tree.root, tree.group, declare);
-        if (!b3util.checkNodeData(tree?.root)) {
-          hasError = true;
-        }
-        if (buildScript?.writeFile) {
-          buildScript.writeFile(buildpath, tree);
-        }
-        fs.mkdirSync(Path.dirname(buildpath), { recursive: true });
-        fs.writeFileSync(buildpath, JSON.stringify(tree, null, 2));
-      }
-    }
+    const hasError = b3util.buildProject(project, buildDir);
     if (hasError) {
       console.error("build failed***");
       app.quit();
diff --git a/sample/scripts/build.js b/sample/scripts/build.js
index 07ec94a..902390d 100644
--- a/sample/scripts/build.js
+++ b/sample/scripts/build.js
@@ -29,11 +29,10 @@
     }
 
     interface BuildScript {
-        processTree?(tree: TreeModel, path: string): TreeModel | null;
-
-        processNode?(node: NodeModel, tree: TreeModel): NodeModel | null;
-
-        writeFile?(path: string, tree: TreeModel): void;
+      processTree?(tree: TreeModel, path: string): TreeModel | null;
+      processNode?(node: NodeModel, tree: TreeModel): NodeModel | null;
+      onWriteFile?(path: string, tree: TreeModel): void;
+      onComplete?(status: "success" | "failure"): void;
     }
 */
 ({
@@ -45,4 +44,7 @@
     console.log(`processNode ${tree.name} ${node.name}#${node.id}`);
     return node;
   },
+  onComplete: (status) => {
+    console.log(`onComplete ${status}`);
+  },
 });
diff --git a/src/contexts/workspace-context.ts b/src/contexts/workspace-context.ts
index 8b168fa..52a691e 100644
--- a/src/contexts/workspace-context.ts
+++ b/src/contexts/workspace-context.ts
@@ -394,47 +394,7 @@ export const useWorkspace = create<WorkspaceStore>((set, get) => ({
       const debug = console.debug;
       console.debug = () => {};
       try {
-        let hasError = false;
-
-        let buildScript: b3util.BuildScript | undefined;
-        if (workspace.settings.buildScript) {
-          const scriptPath = workspace.workdir + "/" + workspace.settings.buildScript;
-          if (fs.existsSync(scriptPath)) {
-            buildScript = eval(fs.readFileSync(scriptPath, "utf8"));
-          }
-        }
-
-        workspace.allFiles.forEach((file) => {
-          const buildpath = buildDir + "/" + workspace.relative(file.path);
-          let tree = b3util.createBuildData(file.path);
-          if (buildScript) {
-            tree = b3util.processBatch(tree, file.path, buildScript);
-          }
-
-          if (!tree) {
-            return;
-          }
-
-          if (tree.export === false) {
-            console.log("skip:", buildpath);
-            return;
-          }
-          console.log("build:", buildpath);
-          const declare: FileVarDecl = {
-            import: tree.import.map((v) => ({ path: v, vars: [], depends: [] })),
-            declvar: tree.declvar.map((v) => ({ name: v.name, desc: v.desc })),
-            subtree: [],
-          };
-          b3util.refreshDeclare(tree.root, tree.group, declare);
-          if (!b3util.checkNodeData(tree?.root)) {
-            hasError = true;
-          }
-          if (buildScript?.writeFile) {
-            buildScript.writeFile(buildpath, tree);
-          }
-          fs.mkdirSync(Path.dirname(buildpath), { recursive: true });
-          fs.writeFileSync(buildpath, JSON.stringify(tree, null, 2));
-        });
+        const hasError = b3util.buildProject(workspace.path, buildDir);
         if (hasError) {
           message.error(i18n.t("buildFailed"));
         } else {
diff --git a/src/misc/b3util.ts b/src/misc/b3util.ts
index 55c560b..9430d38 100644
--- a/src/misc/b3util.ts
+++ b/src/misc/b3util.ts
@@ -1,5 +1,6 @@
 import * as fs from "fs";
 import { ExpressionEvaluator, NodeDef } from "../behavior3/src/behavior3";
+import { type WorkspaceModel } from "../contexts/workspace-context";
 import {
   FileVarDecl,
   ImportDef,
@@ -22,12 +23,12 @@ import { readJson, readTree } from "./util";
 
 export interface BatchScript {
   processTree?(tree: TreeModel, path: string): TreeModel | null;
-
   processNode?(node: NodeModel, tree: TreeModel): NodeModel | null;
 }
 
 export interface BuildScript extends BatchScript {
-  writeFile?(path: string, tree: TreeModel): void;
+  onWriteFile?(path: string, tree: TreeModel): void;
+  onComplete?(status: "success" | "failure"): void;
 }
 
 export class NodeDefs extends Map<string, NodeDef> {
@@ -807,6 +808,54 @@ export const processBatch = (tree: TreeModel | null, path: string, batch: BatchS
   return tree;
 };
 
+export const buildProject = (project: string, buildDir: string) => {
+  let hasError = false;
+  const settings = readJson<WorkspaceModel>(project).settings;
+  let buildScript: BuildScript | undefined;
+  if (settings.checkExpr) {
+    setCheckExpr(true);
+  }
+  if (settings.buildScript) {
+    const scriptPath = workdir + "/" + settings.buildScript;
+    try {
+      buildScript = eval(fs.readFileSync(scriptPath, "utf8"));
+    } catch (e) {
+      console.error(`'${scriptPath}' is not a valid build script`);
+    }
+  }
+  for (const path of Path.ls(Path.dirname(project), true)) {
+    if (path.endsWith(".json")) {
+      const buildpath = buildDir + "/" + path.substring(workdir.length + 1);
+      let tree = createBuildData(path);
+      if (buildScript) {
+        tree = processBatch(tree, path, buildScript);
+      }
+      if (!tree) {
+        continue;
+      }
+      if (tree.export === false) {
+        console.log("skip:", buildpath);
+        continue;
+      }
+      console.log("build:", buildpath);
+      const declare: FileVarDecl = {
+        import: tree.import.map((v) => ({ path: v, vars: [], depends: [] })),
+        declvar: tree.declvar.map((v) => ({ name: v.name, desc: v.desc })),
+        subtree: [],
+      };
+      refreshDeclare(tree.root, tree.group, declare);
+      if (!checkNodeData(tree?.root)) {
+        hasError = true;
+      }
+      buildScript?.onWriteFile?.(buildpath, tree);
+      fs.mkdirSync(Path.dirname(buildpath), { recursive: true });
+      fs.writeFileSync(buildpath, JSON.stringify(tree, null, 2));
+    }
+  }
+  buildScript?.onComplete?.(hasError ? "failure" : "success");
+  return hasError;
+};
+
 export const createFileData = (data: TreeGraphData, includeSubtree?: boolean) => {
   const nodeData: NodeModel = {
     id: Number(data.id),