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rOACCT/node_modules/csso/lib/replace/Dimension.js
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Dimension.js
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			var packNumber = require('./Number').pack;
			var MATH_FUNCTIONS = {
			'calc': true,
			'min': true,
			'max': true,
			'clamp': true
			};
			var LENGTH_UNIT = {
			// absolute length units
			'px': true,
			'mm': true,
			'cm': true,
			'in': true,
			'pt': true,
			'pc': true,

			// relative length units
			'em': true,
			'ex': true,
			'ch': true,
			'rem': true,

			// viewport-percentage lengths
			'vh': true,
			'vw': true,
			'vmin': true,
			'vmax': true,
			'vm': true
			};

			module.exports = function compressDimension(node, item) {
			var value = packNumber(node.value, item);

			node.value = value;

			if (value === '0' && this.declaration !== null && this.atrulePrelude === null) {
			var unit = node.unit.toLowerCase();

			// only length values can be compressed
			if (!LENGTH_UNIT.hasOwnProperty(unit)) {
			return;
			}

			// issue #362: shouldn't remove unit in -ms-flex since it breaks flex in IE10/11
			// issue #200: shouldn't remove unit in flex since it breaks flex in IE10/11
			if (this.declaration.property === '-ms-flex' \|\|
			this.declaration.property === 'flex') {
			return;
			}

			// issue #222: don't remove units inside calc
			if (this.function && MATH_FUNCTIONS.hasOwnProperty(this.function.name)) {
			return;
			}

			item.data = {
			type: 'Number',
			loc: node.loc,
			value: value
			};
			}
			};