@akala/core/src/test/injector.ts

import { SimpleInjector } from '../injectors/simple-injector.js';
import assert from 'assert';
import { useInjector, inject } from '../injectors/reflection-injector.js';
import { it } from 'node:test'

/*var oldProxy = Proxy;

global['Proxy'] = new oldProxy(oldProxy, {
    get: function (target, key)
    {
        if (typeof (key) == 'symbol' && key == Symbol.hasInstance)
        {
            return function (o)
            {
                return o[Symbol.for('isChain')];
            }
        }
        return Reflect.get(target, key);
    }
});


var func = function (key?)
{
    console.log('original function');
    return new Promise((resolve, reject) =>
    {
        resolve(key);
    })
};

var func2 = function (dummy, key?)
{
    console.log('original function2');
    console.log(key);
};

var i1 = new Injector();
i1.register('$config', chain(func, function (keys, ...args)
{
    return [keys.join('.')];
}));

i1.register('$updateConfig', chain(func2, function (keys, dummy, key?: string)
{
    if (key)
        keys.push(key);
    return [dummy, keys.join('.')];
}));

i1.injectWithName(['$config.pwet.a.b.c'], function (config)
{
    config.then((result) =>
    {
        console.log('key: ' + result);
    })
})();


i1.injectWithName(['$updateConfig.pwet.a.b.c'], function (config)
{
    config({ x: 'y' }, 'd');
})();*/
it('injector should work', () =>
{

    const i = new SimpleInjector();
    i.register('os', 'linux')
    i.register('vendor', 'microsoft')
    i.register('action', 'loves')
    i.register('otherVendor', 'node')

    const subI = new SimpleInjector(i);
    @useInjector(subI)
    class A
    {
        @inject('os')
        public os: string;

        @inject()
        public vendor: string;

        public otherVendor: string;

        constructor(@inject('otherVendor') otherVendor?: string)
        {
            this.otherVendor = otherVendor;
        }

        public do(@inject('action') action: string)
        {
            return `${this.vendor} ${action} ${this.os}`;
        }

        public doOtherVendor(@inject('action') action: string)
        {
            return `${this.vendor} ${action} ${this.otherVendor}`;
        }
    }
    const a = new A();

    assert.strictEqual(a.os, i.resolve('os'), 'named injection does not work');
    assert.strictEqual(a.vendor, i.resolve('vendor'), 'implicit injection does not work');
    assert.strictEqual(a.otherVendor, i.resolve('otherVendor'), 'constructor injection does not work');
    assert.strictEqual(a.do('likes'), `${i.resolve<string>('vendor')} ${i.resolve<string>('action')} ${i.resolve<string>('os')}`, 'parameter injection does not work');


    class B extends A
    {
    }

    const b = new B();

    assert.strictEqual(b.os, i.resolve('os'), 'named injection does not work on inherited classes');
    assert.strictEqual(b.vendor, i.resolve('vendor'), 'implicit injection does not work on inherited classes');
    assert.strictEqual(b.do('loves'), 'microsoft loves linux', 'parameter injection does not work on inherited classes');
    assert.strictEqual(b.doOtherVendor('loves'), 'microsoft loves node', 'parameter injection does not work on inherited classes');

    // nested resolutions
    const i1 = new SimpleInjector();
    const i2 = i1.register('a', new SimpleInjector());
    i2.register('b.c', 'x');
    assert.strictEqual(i1.resolve('a.b.c'), 'x')
})