overmind/es/config/merge.js

Frictionless state management

import isPlainObject from "is-plain-obj";

//#region src/config/merge.ts
function copy(target, source) {
	return Object.keys(source).reduce((aggr, key) => {
		if (key === "__esModule") return aggr;
		if (isPlainObject(source[key])) aggr[key] = copy(target[key] || {}, source[key]);
		else if (Array.isArray(source[key])) aggr[key] = source[key];
		else {
			const originalDescriptor = Object.getOwnPropertyDescriptor(source, key);
			const isAGetter = originalDescriptor && "get" in originalDescriptor;
			const value = source[key];
			if (isAGetter) Object.defineProperty(aggr, key, originalDescriptor);
			else aggr[key] = value;
		}
		return aggr;
	}, target);
}
function merge(...configurations) {
	const rootConfiguration = configurations.shift();
	return configurations.reduce((aggr, config) => {
		const stateDuplicates = aggr.state ? Object.keys(aggr.state).some((key) => config.state ? Object.keys(config.state).includes(key) : false) : false;
		const actionsDuplicates = aggr.actions ? Object.keys(aggr.actions).some((key) => config.actions ? Object.keys(config.actions).includes(key) : false) : false;
		const effectsDuplicates = aggr.effects ? Object.keys(aggr.effects).some((key) => config.effects ? Object.keys(config.effects).includes(key) : false) : false;
		if (stateDuplicates) throw new Error("Merge conflict: at least one state definition contains a duplicate key");
		if (actionsDuplicates) throw new Error("Merge conflict: at least one actions definition contains a duplicate key");
		if (effectsDuplicates) throw new Error("Merge conflict: at least one effects definition contains a duplicate key");
		return {
			state: copy(aggr.state, config.state || {}),
			effects: {
				...aggr.effects,
				...config.effects
			},
			actions: {
				...aggr.actions,
				...config.actions
			}
		};
	}, {
		state: {},
		actions: {},
		effects: {},
		...rootConfiguration
	});
}

//#endregion
export { merge };
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