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flash-detect

FlashDetect

Detects the presence and version of the Shockwave Flash plugin.

FlashDetect = require('flash-detect');
console.log(new FlashDetect()); // FlashDetect {installed: true, raw: "Shockwave Flash 15.0 r0", major: 15, minor: 0, revision: -1...}

See more documentation and demo here: http://www.featureblend.com/javascript-flash-detection-library.html