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- 'use strict';
- var GetIntrinsic = require('get-intrinsic');
- var define = require('define-data-property');
- var hasDescriptors = require('has-property-descriptors')();
- var gOPD = require('gopd');
- var $TypeError = GetIntrinsic('%TypeError%');
- var $floor = GetIntrinsic('%Math.floor%');
- module.exports = function setFunctionLength(fn, length) {
- if (typeof fn !== 'function') {
- throw new $TypeError('`fn` is not a function');
- }
- if (typeof length !== 'number' || length < 0 || length > 0xFFFFFFFF || $floor(length) !== length) {
- throw new $TypeError('`length` must be a positive 32-bit integer');
- }
- var loose = arguments.length > 2 && !!arguments[2];
- var functionLengthIsConfigurable = true;
- var functionLengthIsWritable = true;
- if ('length' in fn && gOPD) {
- var desc = gOPD(fn, 'length');
- if (desc && !desc.configurable) {
- functionLengthIsConfigurable = false;
- }
- if (desc && !desc.writable) {
- functionLengthIsWritable = false;
- }
- }
- if (functionLengthIsConfigurable || functionLengthIsWritable || !loose) {
- if (hasDescriptors) {
- define(fn, 'length', length, true, true);
- } else {
- define(fn, 'length', length);
- }
- }
- return fn;
- };
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