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                                                                                                                                                                                     'use strict';
var numberIsNan = require('number-is-nan');

module.exports = function (x) {
	if (numberIsNan(x)) {
		return false;
	}

	// https://github.com/nodejs/io.js/blob/cff7300a578be1b10001f2d967aaedc88aee6402/lib/readline.js#L1369

	// code points are derived from:
	// http://www.unix.org/Public/UNIDATA/EastAsianWidth.txt
	if (x >= 0x1100 && (
		x <= 0x115f ||  // Hangul Jamo
		0x2329 === x || // LEFT-POINTING ANGLE BRACKET
		0x232a === x || // RIGHT-POINTING ANGLE BRACKET
		// CJK Radicals Supplement .. Enclosed CJK Letters and Months
		(0x2e80 <= x && x <= 0x3247 && x !== 0x303f) ||
		// Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
		0x3250 <= x && x <= 0x4dbf ||
		// CJK Unified Ideographs .. Yi Radicals
		0x4e00 <= x && x <= 0xa4c6 ||
		// Hangul Jamo Extended-A
		0xa960 <= x && x <= 0xa97c ||
		// Hangul Syllables
		0xac00 <= x && x <= 0xd7a3 ||
		// CJK Compatibility Ideographs
		0xf900 <= x && x <= 0xfaff ||
		// Vertical Forms
		0xfe10 <= x && x <= 0xfe19 ||
		// CJK Compatibility Forms .. Small Form Variants
		0xfe30 <= x && x <= 0xfe6b ||
		// Halfwidth and Fullwidth Forms
		0xff01 <= x && x <= 0xff60 ||
		0xffe0 <= x && x <= 0xffe6 ||
		// Kana Supplement
		0x1b000 <= x && x <= 0x1b001 ||
		// Enclosed Ideographic Supplement
		0x1f200 <= x && x <= 0x1f251 ||
		// CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
		0x20000 <= x && x <= 0x3fffd)) {
		return true;
	}

	return false;
}