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'use strict';
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const {URL} = require('url');
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const is = require('@sindresorhus/is');
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const knownHookEvents = require('./known-hook-events');
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const merge = (target, ...sources) => {
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for (const source of sources) {
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for (const [key, sourceValue] of Object.entries(source)) {
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if (is.undefined(sourceValue)) {
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continue;
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}
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const targetValue = target[key];
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if (is.urlInstance(targetValue) && (is.urlInstance(sourceValue) || is.string(sourceValue))) {
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target[key] = new URL(sourceValue, targetValue);
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} else if (is.plainObject(sourceValue)) {
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if (is.plainObject(targetValue)) {
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target[key] = merge({}, targetValue, sourceValue);
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} else {
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target[key] = merge({}, sourceValue);
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}
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} else if (is.array(sourceValue)) {
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target[key] = merge([], sourceValue);
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} else {
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target[key] = sourceValue;
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}
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}
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}
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return target;
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};
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const mergeOptions = (...sources) => {
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sources = sources.map(source => source || {});
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const merged = merge({}, ...sources);
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const hooks = {};
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for (const hook of knownHookEvents) {
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hooks[hook] = [];
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}
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for (const source of sources) {
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if (source.hooks) {
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for (const hook of knownHookEvents) {
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hooks[hook] = hooks[hook].concat(source.hooks[hook]);
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}
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}
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}
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merged.hooks = hooks;
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return merged;
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};
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const mergeInstances = (instances, methods) => {
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const handlers = instances.map(instance => instance.defaults.handler);
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const size = instances.length - 1;
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return {
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methods,
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options: mergeOptions(...instances.map(instance => instance.defaults.options)),
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handler: (options, next) => {
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let iteration = -1;
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const iterate = options => handlers[++iteration](options, iteration === size ? next : iterate);
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return iterate(options);
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}
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};
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};
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module.exports = merge;
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module.exports.options = mergeOptions;
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module.exports.instances = mergeInstances;
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