Function asInteger

A function that tries to retrieve an environment variable from the process.env object and, if it succeeds, validates that it can be parsed as an integer, and, if so, returns it as a number value.

Throws

An Error instance explaining that the variable was either not found or that it could not be parsed into a valid integer.

See

asOptionalInteger

Note

Internally, this function uses Number.parseInt to try to convert the string into an integer. That means, for example, that a value like "123_test" will yield "123" instead of failing. In other words, if Number.parseInt returns something other than NaN, this function won't throw.