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readline: lazy loaded

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PR-URL: https://github.com/nodejs/node/pull/20567
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
This commit is contained in:
Ruben Bridgewater 2018-05-06 23:09:01 +02:00
parent d0bb9b1205
commit 2bfba0dd33
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1 changed files with 7 additions and 1 deletions
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8
lib/tty.js
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@ -26,9 +26,11 @@ const net = require('net');
const { TTY, isTTY } = process.binding('tty_wrap'); const { TTY, isTTY } = process.binding('tty_wrap');
const errors = require('internal/errors'); const errors = require('internal/errors');
const { ERR_INVALID_FD, ERR_TTY_INIT_FAILED } = errors.codes; const { ERR_INVALID_FD, ERR_TTY_INIT_FAILED } = errors.codes;
const readline = require('readline');
const { getColorDepth } = require('internal/tty'); const { getColorDepth } = require('internal/tty');
// Lazy loaded for startup performance.
let readline;
function isatty(fd) { function isatty(fd) {
return Number.isInteger(fd) && fd >= 0 && isTTY(fd); return Number.isInteger(fd) && fd >= 0 && isTTY(fd);
} }
@ -122,15 +124,19 @@ WriteStream.prototype._refreshSize = function() {
// Backwards-compat // Backwards-compat
WriteStream.prototype.cursorTo = function(x, y) { WriteStream.prototype.cursorTo = function(x, y) {
if (readline === undefined) readline = require('readline');
readline.cursorTo(this, x, y); readline.cursorTo(this, x, y);
}; };
WriteStream.prototype.moveCursor = function(dx, dy) { WriteStream.prototype.moveCursor = function(dx, dy) {
if (readline === undefined) readline = require('readline');
readline.moveCursor(this, dx, dy); readline.moveCursor(this, dx, dy);
}; };
WriteStream.prototype.clearLine = function(dir) { WriteStream.prototype.clearLine = function(dir) {
if (readline === undefined) readline = require('readline');
readline.clearLine(this, dir); readline.clearLine(this, dir);
}; };
WriteStream.prototype.clearScreenDown = function() { WriteStream.prototype.clearScreenDown = function() {
if (readline === undefined) readline = require('readline');
readline.clearScreenDown(this); readline.clearScreenDown(this);
}; };
WriteStream.prototype.getWindowSize = function() { WriteStream.prototype.getWindowSize = function() {