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48 lines
1.3 KiB
JavaScript

'use strict';
var bind = require('function-bind');
var GetIntrinsic = require('get-intrinsic');
var $apply = GetIntrinsic('%Function.prototype.apply%');
var $call = GetIntrinsic('%Function.prototype.call%');
var $reflectApply = GetIntrinsic('%Reflect.apply%', true) || bind.call($call, $apply);
var $gOPD = GetIntrinsic('%Object.getOwnPropertyDescriptor%', true);
var $defineProperty = GetIntrinsic('%Object.defineProperty%', true);
var $max = GetIntrinsic('%Math.max%');
if ($defineProperty) {
try {
$defineProperty({}, 'a', { value: 1 });
} catch (e) {
// IE 8 has a broken defineProperty
$defineProperty = null;
}
}
module.exports = function callBind(originalFunction) {
var func = $reflectApply(bind, $call, arguments);
if ($gOPD && $defineProperty) {
var desc = $gOPD(func, 'length');
if (desc.configurable) {
// original length, plus the receiver, minus any additional arguments (after the receiver)
$defineProperty(
func,
'length',
{ value: 1 + $max(0, originalFunction.length - (arguments.length - 1)) }
);
}
}
return func;
};
var applyBind = function applyBind() {
return $reflectApply(bind, $apply, arguments);
};
if ($defineProperty) {
$defineProperty(module.exports, 'apply', { value: applyBind });
} else {
module.exports.apply = applyBind;
}