property Process.env
Usage in Deno
```typescript import { type Process } from "node:node__process.d.ts"; ```The `process.env` property returns an object containing the user environment.
See [`environ(7)`](http://man7.org/linux/man-pages/man7/environ.7.html).
An example of this object looks like:
```js
{
TERM: 'xterm-256color',
SHELL: '/usr/local/bin/bash',
USER: 'maciej',
PATH: '~/.bin/:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin',
PWD: '/Users/maciej',
EDITOR: 'vim',
SHLVL: '1',
HOME: '/Users/maciej',
LOGNAME: 'maciej',
_: '/usr/local/bin/node'
}
```
It is possible to modify this object, but such modifications will not be
reflected outside the Node.js process, or (unless explicitly requested)
to other `Worker` threads.
In other words, the following example would not work:
```bash
node -e 'process.env.foo = "bar"' && echo $foo
```
While the following will:
```js
import { env } from 'node:process';
env.foo = 'bar';
console.log(env.foo);
```
Assigning a property on `process.env` will implicitly convert the value
to a string. **This behavior is deprecated.** Future versions of Node.js may
throw an error when the value is not a string, number, or boolean.
```js
import { env } from 'node:process';
env.test = null;
console.log(env.test);
// => 'null'
env.test = undefined;
console.log(env.test);
// => 'undefined'
```
Use `delete` to delete a property from `process.env`.
```js
import { env } from 'node:process';
env.TEST = 1;
delete env.TEST;
console.log(env.TEST);
// => undefined
```
On Windows operating systems, environment variables are case-insensitive.
```js
import { env } from 'node:process';
env.TEST = 1;
console.log(env.test);
// => 1
```
Unless explicitly specified when creating a `Worker` instance,
each `Worker` thread has its own copy of `process.env`, based on its
parent thread's `process.env`, or whatever was specified as the `env` option
to the `Worker` constructor. Changes to `process.env` will not be visible
across `Worker` threads, and only the main thread can make changes that
are visible to the operating system or to native add-ons. On Windows, a copy of `process.env` on a `Worker` instance operates in a case-sensitive manner
unlike the main thread.