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readline: fix calling constructor without new #1385

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readline: fix calling constructor without new #1385

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5 changes: 4 additions & 1 deletion lib/readline.js
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,10 @@ exports.createInterface = function(input, output, completer, terminal) {

function Interface(input, output, completer, terminal) {
if (!(this instanceof Interface)) {
return new Interface(input, output, completer, terminal);
// call the constructor preserving original number of arguments
const self = Object.create(Interface.prototype);
Interface.apply(self, arguments);
return self;
}

this._sawReturn = false;
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12 changes: 12 additions & 0 deletions test/parallel/test-readline-interface.js
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Original file line number Diff line number Diff line change
Expand Up @@ -216,6 +216,18 @@ function isWarned(emitter) {
fi.emit('data', ''); // removes listener
});

// calling readline without `new`
fi = new FakeInput();
rli = readline.Interface({ input: fi, output: fi, terminal: terminal });
called = false;
rli.on('line', function(line) {
called = true;
assert.equal(line, 'asdf');
});
fi.emit('data', 'asdf\n');
assert.ok(called);
rli.close();

if (terminal) {
// question
fi = new FakeInput();
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