GenIoTs

!Licence

> Generate io-ts codecs for classes by decorating props

Installation

``bash
$ npm install --save @orchestrator/gen-io-ts
`

_NOTE_: Library uses globalThis variable to get Reflect object.
You can either provide it manually via provideReflect() function
or make sure that Reflect API is loaded globally (via polyfills).

If required - you may need to load globalThis polyfill.

Usage

First decorate your properties that you want to validate:

`ts
// my-class.ts

import { Property } from '@orchestrator/gen-io-ts';

class MyClass {
@Property() // This will validate prop to be a string
prop: string;
internalProp: any;
}
`

Now generate codec type for your decorated class:

`ts
// main.ts

import { genIoType } from '@orchestrator/gen-io-ts';

import { MyClass } from './my-class.ts';

const myClassType = genIoType(MyClass);

// Then you can validate the type
myClassType.decode({ prop: 'ok' }); // This will produce Right({prop: 'ok'})
myClassType.decode({ prop: false }); // This will produce Left([...])
`

You can now report any validation errors as usual in io-ts:

`ts
import { ThrowReporter } from 'io-ts/lib/ThrowReporter';

ThrowReporter.report(myClassType.decode({...})); // This will throw errors
`

NOTE: By default every property is optional.
To change it - see Required property section.

Advanced usage

$3

Every property is configured to be NOT required, which means you can assign
null/undefined values and validation will not fail.

To change that set isRequired option to true:

`ts
import { Property } from '@orchestrator/gen-io-ts';

class MyClass {
@Property({ isRequired: true }) // Will now fail if null/undefined was set
prop: string;
}
`

$3

Allows to override default inferred type with custom:

`ts
import { Property } from '@orchestrator/gen-io-ts';

class MyClass {
@Property({ type: typeOf(Boolean) }) // Will now allow only booleans instead of strings
prop: string;
}
`

$3

Allows to override/adjust(refine) default type:

`ts
import * as t from 'io-ts';
import { Property } from '@orchestrator/gen-io-ts';

class MyClass {
@Property({
typeFactory: type => t.refine(type, str => str.length > 0, 'NotEmpty'),
}) // Will now allow only non empty strings
prop: string;
}
`

_See: io-ts Refinements for more usage info._

---

This project was generated with Angular CLI version 7.1.4.

Development server

Run ng serve for a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.

Code scaffolding

Run ng generate component component-name to generate a new component. You can also use ng generate directive|pipe|service|class|guard|interface|enum|module.

Build

Run ng build to build the project. The build artifacts will be stored in the dist/ directory. Use the --prod flag for a production build.

Running unit tests

Run ng test to execute the unit tests via Karma.

Running end-to-end tests

Run ng e2e to execute the end-to-end tests via Protractor.

Further help

To get more help on the Angular CLI use ng help` or go check out the Angular CLI README.