Make it easy to extend and add custom predicates about ow

[SamVerschueren]

I'm not sure about the syntax anymore. Maybe something like ow.predicate.validate(customPredicate | function)?

const ow = require('ow');
const owDate = require('ow-date');

// Custom predicate
ow('2017-09-12', ow.string.validate(owDate.date.after('2018-01-01')));

// Custom function
ow('foo', ow.string.validate(value => ({
    message: 'Expected the value to be foo',
    validator: value === 'foo'
});

Just some thoughts :)

[SamVerschueren]

The validate method is actually what is defines in #4. Except that is accepts a function which returns a boolean and not a validation object.

[sindresorhus]

Yeah, I like that API better too.

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[SamVerschueren]

@sindresorhus whats the path forward here? Do you want the API which accepts a validation object?

[sindresorhus]

Yeah, I can't think of a better API than what you've suggest in #40 (comment).

[SamVerschueren]

👌

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