Type check values
Function argument validation for humans
Define errors without frills, but with stack traces and instanceof support.
Validates if a value is a Date object.
The instanceof mechanism cross package/module versions.
Get the type of something. Seriously.
Validates if a value is a regular expression.
Simple Object type/name checks
Additional ESLint rules.
Variable type comparison
Pattern matcher for matching the types and structure of variables
Check if the given value is of the particular type or types.
compare the type of your value with one or several types
Create mixins which work with instanceof (friendly for unit tests).
Safely and simply extend native Error with prototype chaining support
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