user.config.ts文件里提供的默認配置：

• userRoutingConfig
• userCmsConfig
• userTableConfigFactory - function

provideDefaultConfig的實現：

export function provideDefaultConfig(config: any = {}): ValueProvider {return {provide: DefaultConfigChunk,useValue: config,multi: true,}; }

運行時，作為 SAP Spartacus global configuration object這個龐大的配置對象，就是從一個個module里提供的默認配置，一點點合并而成的。

import { CommonModule } from '@angular/common'; import { NgModule } from '@angular/core'; import { ConfigModule } from '../../../config/config.module'; import {COST_CENTERS_NORMALIZER,COST_CENTER_NORMALIZER,COST_CENTER_SERIALIZER, } from '../../../cost-center/connectors/cost-center/converters'; import { OccCostCenterListNormalizer } from './converters/occ-cost-center-list-normalizer'; import { OccCostCenterNormalizer } from './converters/occ-cost-center-normalizer'; import { OccCostCenterSerializer } from './converters/occ-cost-center-serializer'; import { defaultOccCostCentersConfig } from './default-occ-cost-centers-config';@NgModule({imports: [CommonModule, ConfigModule.withConfig(defaultOccCostCentersConfig)],providers: [{provide: COST_CENTERS_NORMALIZER,useExisting: OccCostCenterListNormalizer,multi: true,},{provide: COST_CENTER_NORMALIZER,useExisting: OccCostCenterNormalizer,multi: true,},{provide: COST_CENTER_SERIALIZER,useExisting: OccCostCenterSerializer,multi: true,},], }) export class CostCenterOccModule {}

withConfig的實現：

import { ModuleWithProviders, NgModule } from '@angular/core'; import { provideConfig, provideConfigFactory } from './config-providers'; import { ConfigurationService } from './services/configuration.service';@NgModule({}) export class ConfigModule {// To make sure ConfigurationService will be instantiated, we inject it into// module constructorconstructor(_configurationService: ConfigurationService) {}/*** Import ConfigModule and contribute config to the global configuration** To provide default configuration in libraries provideDefaultConfig should be used instead.** @param config Config object to merge with the global configuration*/static withConfig(config: object): ModuleWithProviders<ConfigModule> {return {ngModule: ConfigModule,providers: [provideConfig(config)],};}/*** Import ConfigModule and contribute config to the global configuration using factory function** To provide default configuration in libraries provideDefaultConfigFactory should be used instead.** @param configFactory Factory function that will generate configuration* @param deps Optional dependencies to factory function*/static withConfigFactory(configFactory: Function,deps?: any[]): ModuleWithProviders<ConfigModule> {return {ngModule: ConfigModule,providers: [provideConfigFactory(configFactory, deps)],};}/*** Module with providers, should be imported only once, if possible, at the root of the app.** @param config*/static forRoot(config: any = {}): ModuleWithProviders<ConfigModule> {return {ngModule: ConfigModule,providers: [provideConfig(config)],};} }

更多Jerry的原創文章，盡在：“汪子熙”:

總結

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