The **error-if-index-how-many-or-array-are-not-valid** package provides a single utility function `errorIfIndex_howMany_orArray_areNotValid(index, howMany, array)` that throws a clear error when the supplied arguments are unusable: the `array` lacks a `.length` property, `index` is outside the bounds of the array (negative values are allowed), or `howMany` is not a positive integer. It’s aimed at JavaScript/Node developers who need lightweight, reusable argument validation for functions that work with array slices or similar index‑based operations.
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Function triggers error if a given index cannot exist in a given array length
Triggers error if argument is not integer of type 'number'
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