| 123456789101112131415161718192021222324252627282930 | let Declaration = require('../declaration')let flexSpec = require('./flex-spec')class Flex extends Declaration {  /**   * Return property name by final spec   */  normalize() {    return 'flex'  }  /**   * Return flex property for 2009 and 2012 specs   */  prefixed(prop, prefix) {    let spec    ;[spec, prefix] = flexSpec(prefix)    if (spec === 2009) {      return prefix + 'box-flex'    }    if (spec === 2012) {      return prefix + 'flex-positive'    }    return super.prefixed(prop, prefix)  }}Flex.names = ['flex-grow', 'flex-positive']module.exports = Flex
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