mithril-proptypes
Awesome lightweight library for data validation and type checking for Mithril.js inspired by React PropTypes. You can you this library as a standalone dependency, because it doesn't have a binding with Mithril.js, though provides special tools to easy integration with Mitril.
Basic Usage
; const propTypes = id: PropTypesnumberisRequired name: PropTypesstring done: PropTypesboolean; const props = id: 1 name: 'Dmitry Salnikov' done: 'false'; propTypes; // WARN >> PropTypes warning: Wrong prop type for "done": "string" instead of declared "boolean"
With ES6 classes
If you use es6 classes for mithril components, then you can do the check in the constructor for example:
; const propTypes = id: PropTypesnumberisRequired name: PropTypesstring done: PropTypesboolean; { propTypes; thisprops = props; } { return <div className="TodoItem">thispropsname</div> ; }
MithrilComponent class
To simplify usage of such checks in the every your mithril component you can extend from the MithrilComponent class provided by this library:
; const propTypes = id: PropTypesnumberisRequired name: PropTypesstring done: PropTypesboolean; { superprops propTypes; thisprops = props; } { return <div className="TodoItem">thispropsname</div> ; }
Now this check is doing by MithrilComponent.
Additional features of MithrilComponent
MithrilComponent class also adds useful lifecycle method onUnload() to your component. This method will be called by mithril.js when this component is going to be removed from the DOM, so you can save some data for example.
; { super; thisprops = props; } { console; } { return <div className="App"></div>; }
Available Types
PropTypes:
- string
- number
- boolean
- function
- object
- array
- objectWith() - complex type
- arrayOf() - complex type
Complex Types
objectWith - is a type definition of each property of an object arrayOf - is a type definition of each item of an array (each property of object-item)
var props = someObject: first: 13 second: 'second' third: true someArray: id: 1 gender: 'male' married: false id: '2' gender: 'female' married: true id: 3 gender: 'male' married: false ; var propTypes = someObject: PropTypes someArray: PropTypesisRequired;
Required Props
Is some property is 'required' by the data doesn't contain this property - then check will print error. To mark some prop as required you can add '.isRequired' to each prop type:
var props = {}; var propTypes = someProp: PropTypesnumberisRequired; propTypes;// ERROR >> PropTypes warning: data for the required prop someProp is absent!
Install
At first - download and install Node.js if you need. It contains own package-manager - NPM. Then run npm to install all necessary dependencies
npm install mithril-proptypes --save
Use with Node.js
var checkProps = checkProps; // ... proptypes;
Panned Features
- Turn off checks for production