strongly-typed

strongly-typed

Strongly-typed JavaScript objects, self-validating, with detailed error reports.

Support

IE9+ and everything else (same support as Object.create)

Usage

var TypeName = stronglyTyped(interface_definition, [prototype], [allowUnspecifiedFields])

interface_definition is a plain object of the expected structure with fields containing strings to match typeof in the typed objects.

You can also use null or empty {} to indicate that the field must exist, without specifying anything else about it.

You can also use [] to enforce field being an array (as typeof retrns "object" for arrays).

Example

var Person = stronglyTyped({
    "name": {
        first:"string",
        last:"string"
    },
    "age": "number",
    "favorites": []
})

//create instance
var joe = Person({
    "name": {
        first:"Joe",
        last:"Average"
    },
    "age": 52,
    "favorites": ["beer","game"]
})

//check type
Person.created(joe) === true

More examples in tests/index.js

No new keyword

Strongly typed objects are factories, not classes. Because it's better that way. See: https://medium.com/javascript-scene/how-to-fix-the-es6-class-keyword-2d42bb3f4caf