| | |
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| | | 'use strict'; |
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| | | var $ = require('../internals/export'); |
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| | | var global = require('../internals/global'); |
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| | | var fails = require('../internals/fails'); |
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| | | var isArray = require('../internals/is-array'); |
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| | | var isObject = require('../internals/is-object'); |
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| | |
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| | | var IS_CONCAT_SPREADABLE = wellKnownSymbol('isConcatSpreadable'); |
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| | | var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF; |
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| | | var MAXIMUM_ALLOWED_INDEX_EXCEEDED = 'Maximum allowed index exceeded'; |
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| | | var TypeError = global.TypeError; |
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| | | |
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| | | // We can't use this feature detection in V8 since it causes |
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| | | // deoptimization and serious performance degradation |
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| | |
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| | | // `Array.prototype.concat` method |
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| | | // https://tc39.es/ecma262/#sec-array.prototype.concat |
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| | | // with adding support of @@isConcatSpreadable and @@species |
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| | | $({ target: 'Array', proto: true, forced: FORCED }, { |
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| | | $({ target: 'Array', proto: true, arity: 1, forced: FORCED }, { |
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| | | // eslint-disable-next-line no-unused-vars -- required for `.length` |
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| | | concat: function concat(arg) { |
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| | | var O = toObject(this); |
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