@angular-builders/custom-webpack
Version:
Custom webpack builders for Angular build facade. Allow to modify Angular build configuration without ejecting it
56 lines • 2.89 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.mergeConfigs = mergeConfigs;
const webpack_merge_1 = require("webpack-merge");
const lodash_1 = require("lodash");
const DEFAULT_MERGE_RULES = {
module: {
rules: {
test: webpack_merge_1.CustomizeRule.Match,
use: {
loader: webpack_merge_1.CustomizeRule.Match,
options: webpack_merge_1.CustomizeRule.Merge,
},
},
},
};
/**
* Returns true if a plugin has a meaningful, unique class name that can be used
* as a deduplication key. Plain object plugins (constructor.name === 'Object')
* cannot be reliably identified as duplicates of another plugin, so they must
* never be merged or deduplicated against other plugins.
*
* Concretely, Angular CLI injects anonymous plain-object plugins (e.g. the i18n
* hash-update plugin added in angular/angular-cli#16817) into the base webpack
* config. If those were matched against a user's plain-object plugin, the Angular
* plugin would be silently dropped or corrupted, breaking features like localized
* build hash regeneration.
*/
function isNamedPlugin(plugin) {
return (plugin != null &&
typeof plugin.constructor === 'function' &&
typeof plugin.constructor.name === 'string' &&
plugin.constructor.name !== '' &&
plugin.constructor.name !== 'Object');
}
function mergeConfigs(webpackConfig1, webpackConfig2, mergeRules = DEFAULT_MERGE_RULES, replacePlugins = false) {
const mergedConfig = (0, webpack_merge_1.mergeWithRules)(mergeRules)(webpackConfig1, webpackConfig2);
if (webpackConfig1.plugins && webpackConfig2.plugins) {
// Only named (class-based) plugins from conf1 participate in deduplication.
// Anonymous plain-object plugins (constructor.name === 'Object') are always
// treated as unique and prepended as-is — they cannot be identified as
// duplicates of user plugins.
const namedConf1Plugins = webpackConfig1.plugins.filter(isNamedPlugin);
const anonymousConf1Plugins = webpackConfig1.plugins.filter(p => !isNamedPlugin(p));
const namedConf1ExceptConf2 = (0, lodash_1.differenceWith)(namedConf1Plugins, webpackConfig2.plugins, (item1, item2) => item1.constructor.name === item2.constructor.name);
if (!replacePlugins) {
const conf1ByName = (0, lodash_1.keyBy)(namedConf1Plugins, 'constructor.name');
webpackConfig2.plugins = webpackConfig2.plugins.map(p => isNamedPlugin(p) && conf1ByName[p.constructor.name]
? (0, lodash_1.merge)(conf1ByName[p.constructor.name], p)
: p);
}
mergedConfig.plugins = [...anonymousConf1Plugins, ...namedConf1ExceptConf2, ...webpackConfig2.plugins];
}
return mergedConfig;
}
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