# session.Session.unsetEnvironment

- **Module:** session
- **Package:** libtmux
- **Language:** TypeScript
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-ts/blob/073b9d7dedad900bff6f5ec0ea47794e40225870/packages/libtmux/src/session.ts#L304
- **Page:** https://libtmux.org/en/ts/latest/reference/session-session-unsetenvironment/

```
unsetEnvironment(name: string): Promise<void>
```

Drop a variable from this session's environment entirely.

## Examples

```ts
await session.unsetEnvironment("EDITOR");
```

## Parameters

- `name` (`string`)

## tmux command

The tmux commands behind `unsetEnvironment`.

- [`set-environment`](/en/tmux/latest/manual/set-environment/)

## tmux C API

The C declarations in tmux that implement these commands.

- [`cmd_set_environment_entry`](/en/tmux/latest/reference/c-variable-cmd_set_environment_entry/) (attribute)
- [`cmd_set_environment_exec`](/en/tmux/latest/reference/c-function-cmd-set-environment-c-cmd_set_environment_exec/) (function)

## Guides

Pages that discuss `unsetEnvironment`.

- [Environment](/en/ts/latest/topics/environment/)

## In other ports

Unset a variable in a session's environment

| Language | Equivalent |
| --- | --- |
| Python | [`libtmux.Session.unset_environment`](/en/py/latest/reference/libtmux-session-unset_environment/) (method) |
| Ruby | [`LibTmux::Session#unset_environment`](/en/ruby/latest/reference/libtmux-session-unset_environment/) (method) |
| Lua | [`libtmux.Session:unset_environment`](/en/lua/latest/reference/libtmux-session-unset_environment/) (method) |
| Rust | [`session.Session.unset_environment`](/en/rs/latest/reference/session-session-unset_environment/) (method) |
| Go | [`tmux.Session.UnsetEnvironment`](/en/go/latest/reference/tmux-session-unsetenvironment/) (method) |
| Java | no equivalent on `Session` |
| C# | no equivalent on `Session` |
| C++ | no equivalent on `Session` |
| Swift | [`Server.unsetEnvironment(_:in:)`](/en/swift/latest/reference/server-unsetenvironment(_-in-)/) (method) |

No equivalent is recorded in PowerShell, Julia, Elixir, Kotlin, Scala or F#.