An ESnext spec-compliant `Array.prototype.flatten` shim/polyfill/replacement that works as far down as ES3.
array.prototype.flatten is deprecated — find an alternative
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curl https://depscope.dev/api/check/npm/array.prototype.flattenFirst published · 2017-10-02T06:42:20.558Z
Last updated · 2018-02-24T07:03:28.135Z