为什么不能通过Npm脚本运行BASH脚本来设置Env变量? [英] Why Can't I Set Env Variables By Running A BASH Script From An Npm Script?

问题描述

我有一个nodejs javascript项目，但我想在本地设置一堆环境变量.创建了一个仅导出一些变量的bash文件:

I have a nodejs javascript project, but I would like to set a bunch of environment variables locally. created a bash file that just exports some variables:

#!/usr/bin/env bash

export waka=flaka
export fat=booty

当我使用点作为源代码并从命令行运行文件时，它工作正常:

When I use the dot to source and run the file from the command line it works fine:

. ./env.sh

我可以看到变量已设置

echo $waka  # prints "flaka"

但是我尝试通过将此命令添加到我的package.json中，使其成为npm脚本

But then I try to take this command and make it an npm script by adding it to my package.json

scripts: {
  "set-env": ". ./env.sh",
  ...
 }

然后运行它:

npm run set-env

脚本已运行，但未保存环境变量:

The script is run but the environment variables are not saved:

echo $waka  # prints undefined (assuming you didn't already run it from command line)

所以，我想知道为什么它不将环境变量保存为npm脚本，以及是否有可能以某种方式从npm脚本运行bash脚本，以便将环境变量保存为其余部分.命令提示符会话.谢谢！

So, I'm wondering why it doesn't save the envrionment variables as an npm script and if it's possible to run the bash script from an npm script in a way such that the environment variables will be saved for the rest of the command prompt session. Thanks!

推荐答案

npm 不是shell命令；它在一个单独的进程中运行，该进程派生另一个外壳，以运行 set-env 指定的命令. env.sh 被执行，但该外壳程序立即退出，此时更改已消失(然后 npm 本身退出).

npm is not a shell command; it runs in a separate process that forks another shell in order to run the command specified by set-env. env.sh is executed, but then that shell immediately exits, at which point the changes are gone (and then npm itself exits).

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