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rOACCT/node_modules/css-to-react-native/src/transforms/flex.js
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flex.js
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			import {
			NONE,
			AUTO,
			NUMBER,
			LENGTH,
			UNSUPPORTED_LENGTH_UNIT,
			PERCENT,
			SPACE,
			} from '../tokenTypes'

			const defaultFlexGrow = 1
			const defaultFlexShrink = 1
			const defaultFlexBasis = 0

			export default tokenStream => {
			let flexGrow
			let flexShrink
			let flexBasis

			if (tokenStream.matches(NONE)) {
			tokenStream.expectEmpty()
			return { flexGrow: 0, flexShrink: 0, flexBasis: 'auto' }
			}

			tokenStream.saveRewindPoint()
			if (tokenStream.matches(AUTO) && !tokenStream.hasTokens()) {
			return { flexGrow: 1, flexShrink: 1, flexBasis: 'auto' }
			}
			tokenStream.rewind()

			let partsParsed = 0
			while (partsParsed < 2 && tokenStream.hasTokens()) {
			if (partsParsed !== 0) tokenStream.expect(SPACE)

			if (flexGrow === undefined && tokenStream.matches(NUMBER)) {
			flexGrow = tokenStream.lastValue

			tokenStream.saveRewindPoint()
			if (tokenStream.matches(SPACE) && tokenStream.matches(NUMBER)) {
			flexShrink = tokenStream.lastValue
			} else {
			tokenStream.rewind()
			}
			} else if (
			flexBasis === undefined &&
			tokenStream.matches(LENGTH, UNSUPPORTED_LENGTH_UNIT, PERCENT)
			) {
			flexBasis = tokenStream.lastValue
			} else if (flexBasis === undefined && tokenStream.matches(AUTO)) {
			flexBasis = 'auto'
			} else {
			tokenStream.throw()
			}

			partsParsed += 1
			}

			tokenStream.expectEmpty()

			if (flexGrow === undefined) flexGrow = defaultFlexGrow
			if (flexShrink === undefined) flexShrink = defaultFlexShrink
			if (flexBasis === undefined) flexBasis = defaultFlexBasis

			return { flexGrow, flexShrink, flexBasis }
			}