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We can create an instance of the interface using the readline.createInterface(), as shown below. Each instance of an interface is associated with a single Writeable and a single Readable stream. The Readline module provides a way of reading a datastream, one line at a time. Optionally, interface specifies a readline.Interface instance for which autocompletion is disabled when copy-pasted input is detected. To use the Readline module, we need to create an interface for reading and writing data to and from the stream.Īn interface is an abstraction that helps us interact with the stream. interface readline.InterfaceConstructor The readline.emitKeypressEvents() method causes the given Readable stream to begin emitting 'keypress' events corresponding to received input. The node:readline module provides an interface for reading data from a Readable stream (such as process.stdin ) one line at a time. CodeĪs an example, let’s write two lines on STDOUT and remove the second line.
![nodejs readline nodejs readline](https://i.stack.imgur.com/Fx7af.png)
In other words, TypeScript is also NodeJS so you can use any NodeJS module in TypeScript including the readline module.
#Nodejs readline code#
At the end, your TypeScript code once compiled will generate NodeJS code. Otherwise, Readline.clearLine() returns true. FredDanna You're right but TypeScript is just a language which adds a layer over NodeJS code to add things like type checks.
![nodejs readline nodejs readline](https://www.venturelessons.com/wp-content/uploads/2020/4/screen_200429_073125.png)
An example of a web server written with Node. Readline.clearLine() returns a boolean it returns false if the stream expects the calling code to wait for the drain event to be emitted. readline repl report stream stream/web stringdecoder test timers tls traceevents tty url util v8 vm wasi workerthreads. node options V8 options script.js -e 'script' - arguments Please see the Command-line options document for more information. 1: Clears line to the right of the cursor.Ĭallback : The function that is invoked at the end of the operation.-1: Clears line to the left of the cursor.Prototype readline.clearLine(stream, dir)ĭir : dir determines the direction relative to the cursor that will be cleared.
![nodejs readline nodejs readline](http://i.stack.imgur.com/psKx9.png)
Readline.clearLine() clears the current line on the TTY stream in the direction specified by the user. Note that once youve invoked this module, your node program will not terminate. The Readline.clearLine() method is contained in the ReadLine module, which provides an internal API for reading and writing data to and from the standard input.output streams. Readline allows reading of a stream (such as STDIN) on a line-by-line basis.
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