JavaScript Code Contract Libraries?

Question

I am just starting up a new web application and I want to implement some form of contract\'esque style validation in my JavaScript. I did some quick googling, and came across Js

Answer 1

I may suggest you the next code contracts library: dbc-code-contracts.

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NPM: https://www.npmjs.com/package/dbc-code-contracts

GitLab repo (home): https://gitlab.com/o.oleg/orbios.dbc#README

CI-builds with the unit-tests: https://gitlab.com/o.oleg/orbios.dbc/-/jobs/

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Sample code:

Dbc.Contract.throwException = true;

const domId = "my-div";
const div   = document.createElement("div");
div.id .    = domId;
document.body.appendChild(div);

const state = Dbc.Dom.removeById(domId);
Dbc.Contract.isTrue(state);
Dbc.Contract.isNull(document.getElementById(domId));

The following contracts are supported (2nd November, 2017):

1. isFunction
2. isObject
3. isSymbol
4. isBoolean
5. isTrue
6. isFalse
7. isString
8. isEmptyString
9. isNotEmptyString
10. areStringsEqual
11. isNumber
12. isNumberLess
13. isNumberBigger
14. areNumbersEqual
15. isValueNaN
16. isDefined
17. isUndefined
18. isNull
19. isArray
20. isEmptyArray
21. isNotEmptyArray
22. isObjectImmutable
23. isPromise
24. isPrototypeOf

Also, there are internal contract checks, inside the DOM methods from this library.