lib/src/lifecycle/AppClass.ts

import {Application} from './Application';
import {Container, DependencyKey} from "@extollo/di";

/**
 * Base type for a class that supports binding methods by string.
 */
export interface Bindable {
    getBoundMethod(methodName: string): (...args: any[]) => any
}

/**
 * Returns true if the given object is bindable.
 * @param what
 * @return boolean
 */
export function isBindable(what: any): what is Bindable {
    return (
        what
        && typeof what.getBoundMethod === 'function'
        && what.getBoundMethod.length === 1
        && typeof what.getBoundMethod('getBoundMethod') === 'function'
    )
}

/**
 * Base for classes that gives access to the global application and container.
 */
export class AppClass {
    /** The global application instance. */
    private readonly appClassApplication!: Application;

    constructor() {
        this.appClassApplication = Application.getApplication();
    }

    /** Get the global Application. */
    protected app(): Application {
        return this.appClassApplication;
    }

    /** Get the global Container. */
    protected container(): Container {
        return this.appClassApplication;
    }

    /** Call the `make()` method on the global container. */
    protected make<T>(target: DependencyKey, ...parameters: any[]): T {
        return this.container().make<T>(target, ...parameters)
    }

    /**
     * Get the method with the given name from this class, bound to this class.
     * @param {string} methodName
     * @return function
     */
    public getBoundMethod(methodName: string): (...args: any[]) => any {
        // @ts-ignore
        if ( typeof this[methodName] !== 'function' ) {
            throw new TypeError(`Attempt to get bound method for non-function type: ${methodName}`)
        }

        return (...args: any[]): any => {
            // @ts-ignore
            return this[methodName](...args)
        }
    }
}