JupyterLab plotly extension error: Cannot find module jupyter\lab\staging\node_modules\ejs\postinstall.js

Question

我正在尝试安装对 Plotly 的 JupyterLab 渲染器支持：

jupyter labextension install jupyterlab-plotly@4.10.0

我得到

RuntimeError: npm dependencies failed to install

日志文件包含以下内容：

[LabBuildApp] Building in C:\Users\<user>\anaconda3\share\jupyter\lab
[LabBuildApp] Node v14.11.0

[LabBuildApp] Yarn configuration loaded.
[LabBuildApp] Building jupyterlab assets (build:prod:minimize)
[LabBuildApp] > node C:\Users\<user>\anaconda3\lib\site-packages\jupyterlab\staging\yarn.js install --non-interactive
[LabBuildApp] yarn install v1.21.1
[1/5] Validating package.json...
[2/5] Resolving packages...
[3/5] Fetching packages...
info fsevents@2.1.3: The platform "win32" is incompatible with this module.
info "fsevents@2.1.3" is an optional dependency and failed compatibility check. Excluding it from installation.
info fsevents@1.2.13: The platform "win32" is incompatible with this module.
info "fsevents@1.2.13" is an optional dependency and failed compatibility check. Excluding it from installation.
[4/5] Linking dependencies...
warning " > @lumino/coreutils@1.5.0" has unmet peer dependency "crypto@1.0.1".
[5/5] Building fresh packages...
error C:\Users\<user>\anaconda3\share\jupyter\lab\staging\node_modules\ejs: Command failed.
Exit code: 1
Command: node ./postinstall.js
Arguments: 
Directory: C:\Users\<user>\anaconda3\share\jupyter\lab\staging\node_modules\ejs
Output:
internal/modules/cjs/loader.js:896
  throw err;
  ^

Error: Cannot find module 'C:\Users\<user>\anaconda3\share\jupyter\lab\staging\node_modules\ejs\postinstall.js'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:893:15)
    at Function.Module._load (internal/modules/cjs/loader.js:743:27)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
    at internal/main/run_main_module.js:17:47 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

[LabBuildApp] npm dependencies failed to install
[LabBuildApp] Traceback (most recent call last):

[LabBuildApp]   File "C:\Users\<user>\anaconda3\lib\site-packages\jupyterlab\debuglog.py", line 47, in debug_logging
    yield

[LabBuildApp]   File "C:\Users\<user>\anaconda3\lib\site-packages\jupyterlab\labapp.py", line 138, in start
    raise e

[LabBuildApp]   File "C:\Users\<user>\anaconda3\lib\site-packages\jupyterlab\labapp.py", line 134, in start
    build(name=self.name, version=self.version,

[LabBuildApp]   File "C:\Users\<user>\anaconda3\lib\site-packages\jupyterlab\commands.py", line 459, in build
    return handler.build(name=name, version=version, static_url=static_url,

[LabBuildApp]   File "C:\Users\<user>\anaconda3\lib\site-packages\jupyterlab\commands.py", line 652, in build
    raise RuntimeError(msg)

[LabBuildApp] RuntimeError: npm dependencies failed to install

[LabBuildApp] Exiting application: JupyterLab

当我打开 JupyterLab 时，我被要求做一个

jupyter lab build

在我尝试之后，我在日志文件中得到了同样的错误。

我正在使用 Windows10、node.js 14.11.0（使用 conda 安装）、JupyterLab 2.1.5

注意我试过了：

正在卸载 conda 的 node.js 并直接从 node-v12.18.3-x64.msi
卸载和安装 Anaconda

都没有运气。

Answer 1

可能是防火墙的问题。

尝试在 npm 的配置中设置代理，甚至关闭 strict-ssl：

npm config set strict-ssl false

和

npm config set proxy http://host:port

对于http

或

npm config set https-proxy https://host:port

对于https

Answer 2

好的，我想明白为什么会这样了，ejs 的第 2 版有一个 post 安装脚本，但它已从第 3 版中删除。它看起来像另一个包 cjs 出于某种原因试图直接调用 ejs/postInstall.js。

您似乎有一些依赖项不同步。我的建议是删除 node_modules 和 package-lock.json 并再次尝试安装命令。

如果这不起作用，请查找任何其他锁定文件，例如 yarn.lock 并删除它们，然后再次 node_modules。

祝你好运

Answer 3

根据您之前的评论，您确认您没有使用任何代理，这是导致这些错误的最常见原因之一。即使我尝试安装 jupyter lab 和 plotly 扩展，因为我也想尝试一下，它对我没有任何错误。

问题可能因您的环境而异。主要是因为损坏的 npm 包。您可以尝试以下任何步骤，它可能会成功

移动到目录 C:\Users\anaconda3\share\jupyter\lab\staging，并删除 node_module 文件夹。删除文件夹后，请从同一文件夹尝试运行命令 yarn install。如果没有错误那么你应该是好的。
如果上述方法不起作用，您可以使用命令yarn cache clean重置纱线缓存。并重试步骤 1。
如果仍然无效，请尝试删除 yarn.lock 文件，然后执行第 2 步和第 1 步。

节点：请备份您要删除的文件。也没有办法告诉你哪一步适合你，它只是点击和试用。

JupyterLab plotly extension error: Cannot find module jupyter\lab\staging\node_modules\ejs\postinstall.js

JupyterLab plotly extension error: Cannot find module jupyter\lab\staging\node_modules\ejs\postinstall.js

ejs

node.js

npm

plotly

jupyter-lab