sprang-decorators

Various typescript decorators

@Autobind

Class decorator

import { Autobind } from './../decorators-module';

@Autobind
export class X {

    private _myVar;

    constructor() {}

    public method1() {
        this._myVar;
    }

    public method2(v:any) {
        this._myVar=v;
    }

}

When method1 or method2 are called "this" will always refer to X class instance.

Method decorator

import { Autobind } from './../decorators-module';

export class X {

    private _myVar;

    constructor() {}

    @Autobind
    public method1() {
        this._myVar;
    }

    public method2(v:any) {
        this._myVar=v;
    }

}

When method1 is called "this" will always refer to X class instance.

When method2 is called "this" will depend on the context.

@Override

import { Trace } from './../decorators-module';

export class X {

    @Autobind
    public myMethod() {}

}

export class Y {

    @Override
    public myMethod() {}

}

Override decorator will check that:

• X implements myMethod

• If myMethod of X is autobinded, myMethod of Y is automatically autobinded

@Trace

Class decorator

import { Trace } from './../decorators-module';

@Trace
export class X {

    private _myVar;

    constructor() {}

    public method1() {
        this._myVar;
    }

    public method2(v:any) {
        this._myVar=v;
    }

}

Every X instances creation + every call of methods will be logged in the console

Method decorator

import { Trace } from './../decorators-module';

export class X {

    private _myVar;

    constructor() {}

    @Trace
    public method1() {
        this._myVar;
    }

    public method2(v:any) {
        this._myVar=v;
    }

}

Every call to method1 will be logged in the console

Property decorator

import { Trace } from './../decorators-module';

export class X {

    @Trace
    private _myVar;

    constructor() {}

    public method1() {
        this._myVar;
    }

    public method2(v:any) {
        this._myVar=v;
    }

}

Every modification of _myvar will be logged in the console.