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Re:Bundle Phobia: find the cost of adding an npm package to ... by banjomonster on Monday December 18, 2017 @01:17PM (#15953821)
Array.isArray is available in the runtime, but it was a later addition so folks may be downloading it for compatibility. There is a LOT of that in the javascript ecosystem.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

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