WriteStream - node__tty.d.ts - Node

class WriteStream

extends net.Socket

Usage in Deno

```typescript import { WriteStream } from "node:node__tty.d.ts"; ```

Represents the writable side of a TTY. In normal circumstances, `process.stdout` and `process.stderr` will be the only`tty.WriteStream` instances created for a Node.js process and there should be no reason to create additional instances.

Constructors

new



WriteStream(fd: number)

Properties



columns: number

A `number` specifying the number of columns the TTY currently has. This property is updated whenever the `'resize'` event is emitted.



isTTY: boolean

A `boolean` that is always `true`.



rows: number

A `number` specifying the number of rows the TTY currently has. This property is updated whenever the `'resize'` event is emitted.

Methods



addListener(event: string,
listener: (...args: any[]) => void,
): this



addListener(event: "resize",
listener: () => void,
): this



clearLine(dir: Direction,
callback?: () => void,
): boolean

`writeStream.clearLine()` clears the current line of this `WriteStream` in a direction identified by `dir`.



clearScreenDown(callback?: () => void): boolean

`writeStream.clearScreenDown()` clears this `WriteStream` from the current cursor down.



cursorTo(x: number,
y?: number,
callback?: () => void,
): boolean

`writeStream.cursorTo()` moves this `WriteStream`'s cursor to the specified position.



cursorTo(x: number,
callback: () => void,
): boolean



emit(event: string | symbol,
...args: any[],
): boolean



emit(event: "resize"): boolean



getColorDepth(env?: object): number

Returns: * `1` for 2, * `4` for 16, * `8` for 256, * `24` for 16,777,216 colors supported. Use this to determine what colors the terminal supports. Due to the nature of colors in terminals it is possible to either have false positives or false negatives. It depends on process information and the environment variables that may lie about what terminal is used. It is possible to pass in an `env` object to simulate the usage of a specific terminal. This can be useful to check how specific environment settings behave. To enforce a specific color support, use one of the below environment settings. * 2 colors: `FORCE_COLOR = 0` (Disables colors) * 16 colors: `FORCE_COLOR = 1` * 256 colors: `FORCE_COLOR = 2` * 16,777,216 colors: `FORCE_COLOR = 3` Disabling color support is also possible by using the `NO_COLOR` and `NODE_DISABLE_COLORS` environment variables.



getWindowSize(): [number, number]

`writeStream.getWindowSize()` returns the size of the TTY corresponding to this `WriteStream`. The array is of the type `[numColumns, numRows]` where `numColumns` and `numRows` represent the number of columns and rows in the corresponding TTY.



hasColors(count?: number): boolean

Returns `true` if the `writeStream` supports at least as many colors as provided in `count`. Minimum support is 2 (black and white). This has the same false positives and negatives as described in `writeStream.getColorDepth()`. ```js process.stdout.hasColors(); // Returns true or false depending on if `stdout` supports at least 16 colors. process.stdout.hasColors(256); // Returns true or false depending on if `stdout` supports at least 256 colors. process.stdout.hasColors({ TMUX: '1' }); // Returns true. process.stdout.hasColors(2 ** 24, { TMUX: '1' }); // Returns false (the environment setting pretends to support 2 ** 8 colors). ```



hasColors(env?: object): boolean



hasColors(count: number,
env?: object,
): boolean



moveCursor(dx: number,
dy: number,
callback?: () => void,
): boolean

`writeStream.moveCursor()` moves this `WriteStream`'s cursor _relative_ to its current position.



on(event: string,
listener: (...args: any[]) => void,
): this



on(event: "resize",
listener: () => void,
): this



once(event: string,
listener: (...args: any[]) => void,
): this



once(event: "resize",
listener: () => void,
): this



prependListener(event: string,
listener: (...args: any[]) => void,
): this



prependListener(event: "resize",
listener: () => void,
): this



prependOnceListener(event: string,
listener: (...args: any[]) => void,
): this



prependOnceListener(event: "resize",
listener: () => void,
): this