velt/process: standard input#

import { lines, readLine } from "velt/process". Reads standard input. The sync and async readers share one buffered stream. Text is UTF-8, and invalid bytes become U+FFFD. Before a read waits for input, what the program wrote to standard output is flushed, as in Node: a prompt printed with console.log is on the screen while the program waits for the answer.

• readLine(): Promise<string | null> / readLineSync(): the line without \n / \r\n, or null at end of input.
• lines(): AsyncGenerator<string, IoError>: the remaining lines, as readLine reads them, for for await (const line of lines()) (in Node: for await (const line of readline.createInterface({ input: process.stdin }))).
• readAll(): Promise<string> / readAllSync(): everything left on standard input.
• readAllBytes(): Promise<u8[]> / readAllBytesSync(): the same, as raw bytes.
• stdin.isTTY: whether standard input is a terminal (velt/process).

import { lines } from "velt/process";

let n = 0;
for await (const line of lines()) {
  n++;
  console.log(`${n}: ${line}`);
}

import { readLine } from "velt/process";

console.log("Your name?");
const name = (await readLine()) ?? "stranger";
console.log(`Hello, ${name}`);