---
module: [kind=event] key
---

<!--
SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

SPDX-License-Identifier: MPL-2.0
-->

This event is fired when any key is pressed while the terminal is focused.

This event returns a numerical "key code" (for instance, <kbd>F1</kbd> is 290). This value may vary between versions and
so it is recommended to use the constants in the [`keys`] API rather than hard coding numeric values.

If the button pressed represented a printable character, then the [`key`] event will be followed immediately by a [`char`]
event. If you are consuming text input, use a [`char`] event instead!

## Return values
1. [`string`]: The event name.
2. [`number`]: The numerical key value of the key pressed.
3. [`boolean`]: Whether the key event was generated while holding the key ([`true`]), rather than pressing it the first time ([`false`]).

## Example
Prints each key when the user presses it, and if the key is being held.

```lua
while true do
  local event, key, is_held = os.pullEvent("key")
  print(("%s held=%s"):format(keys.getName(key), is_held))
end
```