Generate assertion for Object Type Application?

[victor-homyakov]

https://github.com/google/closure-compiler/wiki/Annotating-JavaScript-for-the-Closure-Compiler#type-application describes possible Type Application for Object: Object<string, someType>. It's easy to implement assert generation for this case as

/**
 * @param {Object<string, number>} x
 */

=>

Object.values(x).every(function (item) {
    return typeof item  === 'number';
});

AFAIK there is no need to generate assertion for first type (for object keys), as it will always be string.

If it looks good, then I'll make a PR.

[azu]

It looks good to me.

But, Object.values() is not parts of current ECMAScript yet.
(It will be included in ECMAScript 2017. Some enviroment is not implemented yet.)

It is better that use Object.keys(x) instead of Object.values(x), I think.

Object.keys(x).every(function (key) {
    return typeof x[key]  === 'number';
});