angular-cli-builders/src/custom-webpack/webpack-config-merger.js

A set of additional builders for angular-cli

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const webpackMerge = require("webpack-merge");
const lodash_1 = require("lodash");
const joinArrays = require('webpack-merge/lib/join-arrays');
class WebpackConfigMerger {
    static merge(webpackConfig1, webpackConfig2, mergeStrategies = {}, replacePlugins = false) {
        return webpackMerge({
            customizeArray: replacePlugins ? mergeReplacePlugins(customizeArray(mergeStrategies)) : customizeArray(mergeStrategies),
            customizeObject: customizeObject(mergeStrategies)
        })(webpackConfig1, webpackConfig2);
    }
}
exports.WebpackConfigMerger = WebpackConfigMerger;
function mergeReplacePlugins(defaultArrayMerger) {
    return (a, b, key) => {
        let plugins;
        if (key === 'plugins') {
            const aExceptb = lodash_1.differenceWith(a, b, (item1, item2) => item1.constructor.name === item2.constructor.name);
            plugins = [...aExceptb, ...b];
        }
        else {
            plugins = defaultArrayMerger(a, b, key);
        }
        return plugins;
    };
}
function customizeArray(strategies) {
    return (a, b, key) => {
        switch (strategies[key]) {
            case 'prepend':
                return [...b, ...a];
            case 'replace':
                return b;
            default: // append
                return undefined;
        }
    };
}
function customizeObject(strategies) {
    return (a, b, key) => {
        switch (strategies[key]) {
            case 'prepend':
                return lodash_1.mergeWith({}, b, a, joinArrays());
            case 'replace':
                return b;
            default: // append
                return undefined;
        }
    };
}
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