aproba
This is the same as the aproba module except modified to not use Error.captureStackTrace which doesn't work in browsers. Admittedly, the trace gets some extraneous stuff, but I don't know a better way.
A ridiculously light-weight function argument validator
var validate = require("aproba-browser")
function myfunc(a, b, c) {
// `a` must be a string, `b` a number, `c` a function
validate('SNF', arguments) // [a,b,c] is also valid
}
myfunc('test', 23, function () {}) // ok
myfunc(123, 23, function () {}) // type error
myfunc('test', 23) // missing arg error
myfunc('test', 23, function () {}, true) // too many args error
Valid types are:
| type | description |
|---|
- | matches any type A | Array.isArray OR an arguments object S | typeof == string N | typeof == number F | typeof == function O | typeof == object and not type A and not type E B | typeof == boolean E | instanceof Error OR null
Validation failures throw one of three exception types, distinguished by a
code property of EMISSINGARG, EINVALIDTYPE or ETOOMANYARGS.
If you pass in an invalid type then it will throw with a code of
EUNKNOWNTYPE.
If an error argument is found and is not null then the remaining arguments will not be validated.
Why this exists
I wanted a very simple argument validator. It needed to do two things:
-
Be more concise and easier to use than assertions
-
Not encourage an infinite bikeshed of DSLs
This is why types are specified by a single character and there's no such thing as an optional argument.
This is not intended to validate user data. This is specifically about asserting the interface of your functions.
If you need greater validation, I encourage you to write them by hand or look elsewhere.