nf build fails with EISDIR when the assets folder has a subfolder

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Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
node.js, typescript
领域
backend, cli

调研方向

从 src/lib/utils/files.ts 开始，重点查看第 9–10 行的 copyFiles，并追踪 nf build、nf dev 和 nf build --watch 如何使用它。添加一个单元测试，用于复制包含嵌套子文件夹的 assets 文件夹，然后验证整个目录树都能复制完成且不会出现 EISDIR。

由索引模型根据 Issue 内容生成。

描述

bug command:build good first issue
Which package is this bug report for?

@nanoforge-dev/cli

Which command is this bug report for?

build

Issue description

nf build fails with EISDIR as soon as the assets folder has a subfolder. copyFiles lists readdirSync(from, { recursive: true }), which returns folders as well as files, and calls copyFileSync on every entry without creating the subfolders in the output (src/lib/utils/files.ts#L9-L10). nf dev and nf build --watch fail the same way. Related to #12 (the feature that added the asset copy).

Steps to reproduce (reproduced with dist/nf.js):

  1. A client project with assets/a.png and assets/sprites/b.png.
  2. nf build
  3. Error: EISDIR: illegal operation on a directory, copyfile '.../assets/sprites' -> '.../dist/sprites', Build failed!, exit code 1. dist/ holds only a.png.

Expected: the whole assets tree is copied (e.g. fs.cpSync(from, to, { recursive: true })), with a unit test on a nested assets folder.

Found during a read-only audit of main at e95b881 (2026-11-11).

Code sample
// assets/a.png
// assets/sprites/b.png
// nf build  -> EISDIR: illegal operation on a directory, copyfile 'assets/sprites' -> 'dist/sprites'
Versions
  • @nanoforge-dev/cli 3.0.1 (main, e95b881)
  • Node.js 26.7.0
  • Bun 1.3.14 (bundled)
  • Linux
Issue priority

High (immediate attention needed)

I have tested this issue on a development release

e95b881

主要语言
TypeScript
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2
派生
2
平均合并
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  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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