@xoid/feature/index.js

A plugin system to compose JavaScript classes

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

const defaultFrom = (a) => {
    throw new Error('`this.from` cannot be used outside the `compose` context.');
};
const current = {
    from: defaultFrom,
};
class Feature {
    constructor(options, from) {
        this.from = function (a) {
            return current.from(a);
        };
        this.getOptions = (defaultOptions) => (Object.assign(Object.assign({}, defaultOptions), this.externalOptions));
        this.options = options;
        this.externalOptions = options;
        if (from)
            this.from = from;
    }
}
const traversePrototypeChain = (instance, fn) => {
    const prototype = Object.getPrototypeOf(instance);
    const { constructor } = prototype;
    if (constructor === Feature || constructor === Function)
        return;
    fn(constructor);
    traversePrototypeChain(prototype, fn);
};
function registerFeature(contextMap, instance) {
    traversePrototypeChain(instance, (ctor) => contextMap.set(ctor, instance));
    if (instance.id)
        contextMap.set(instance.id, instance);
}
const compose = (config, getResult) => (options, overrides) => {
    const contextMap = new Map();
    function from(input) {
        const output = contextMap.get(typeof input === 'object' ? input.id : input);
        if (!output) {
            throw new Error(`Dependency '${input.name}' was not found in '${this.constructor.name}'.`);
        }
        return output;
    }
    current.from = from;
    // @ts-ignore
    if (overrides)
        config = [...config, ...overrides];
    config
        .map((item) => {
        const instance = new item(options, from);
        registerFeature(contextMap, instance);
        return instance;
    })
        .forEach((instance) => { var _a; return (_a = instance === null || instance === void 0 ? void 0 : instance.main) === null || _a === void 0 ? void 0 : _a.call(instance); });
    current.from = defaultFrom;
    return getResult(from, {});
};

exports.Feature = Feature;
exports.compose = compose;