user.config.ts檔案裡定義的配置是如何合并到SAP Spartacus的标準配置裡去的

user.config.ts檔案裡提供的預設配置：

userRoutingConfig

userCmsConfig

userTableConfigFactory - function

provideDefaultConfig的實作：

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

運作時，作為 SAP Spartacus global configuration object這個龐大的配置對象，就是從一個個module裡提供的預設配置，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的實作：

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 constructor
  constructor(_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)],
    };
  }
}