# All files / core/injector container.ts

89.36% Statements 84/94
82.86% Branches 29/35
89.66% Functions 26/29
90.11% Lines 82/91

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     import { DynamicModule } from '@nestjs/common';
    import { GLOBAL_MODULE_METADATA } from '@nestjs/common/constants';
    import { Type } from '@nestjs/common/interfaces/type.interface';
    import { ApplicationConfig } from '../application-config';
    import { CircularDependencyException } from '../errors/exceptions/circular-dependency.exception';
    import { InvalidModuleException } from '../errors/exceptions/invalid-module.exception';
    import { UnknownModuleException } from '../errors/exceptions/unknown-module.exception';
    import { ApplicationReferenceHost } from '../helpers/application-ref-host';
    import { ExternalContextCreator } from '../helpers/external-context-creator';
    import { Reflector } from '../services';
    import { ModuleCompiler } from './compiler';
    import { Module } from './module';
    import { ModulesContainer } from './modules-container';

    export class NestContainer {
      private readonly globalModules = new Set<Module>();
      private readonly moduleCompiler = new ModuleCompiler();
      private readonly modules = new ModulesContainer();
      private readonly dynamicModulesMetadata = new Map<
        string,
        Partial<DynamicModule>
      >();
      private readonly reflector = new Reflector();
      private readonly applicationRefHost = new ApplicationReferenceHost();
      private externalContextCreator: ExternalContextCreator;
      private modulesContainer: ModulesContainer;
      private applicationRef: any;

      constructor(
        private readonly _applicationConfig: ApplicationConfig = void 0,
      ) {}

      get applicationConfig(): ApplicationConfig | undefined {
        return this._applicationConfig;
      }

      public setApplicationRef(applicationRef: any) {
        this.applicationRef = applicationRef;

        if (!this.applicationRefHost) {
          return;
        }
        this.applicationRefHost.applicationRef = applicationRef;
      }

      public getApplicationRef() {
        return this.applicationRef;
      }

      public async addModule(
        metatype: Type<any> | DynamicModule | Promise<DynamicModule>,
        scope: Type<any>[],
      ) {
        if (!metatype) {
          throw new InvalidModuleException(scope);
        }
        const { type, dynamicMetadata, token } = await this.moduleCompiler.compile(
          metatype,
          scope,
        );
        if (this.modules.has(token)) {
          return;
        }
        const module = new Module(type, scope, this);
        this.modules.set(token, module);

        this.addDynamicMetadata(token, dynamicMetadata, [].concat(scope, type));
        this.isGlobalModule(type) && this.addGlobalModule(module);
      }

      public addDynamicMetadata(
        token: string,
        dynamicModuleMetadata: Partial<DynamicModule>,
        scope: Type<any>[],
      ) {
        if (!dynamicModuleMetadata) {
          return undefined;
        }
        this.dynamicModulesMetadata.set(token, dynamicModuleMetadata);

        const { modules, imports } = dynamicModuleMetadata;
        this.addDynamicModules(modules, scope);
        this.addDynamicModules(imports, scope);
      }

      public addDynamicModules(modules: any[], scope: Type<any>[]) {
        if (!modules) {
          return undefined;
        }
        modules.forEach(module => this.addModule(module, scope));
      }

      public isGlobalModule(metatype: Type<any>): boolean {
        return !!Reflect.getMetadata(GLOBAL_MODULE_METADATA, metatype);
      }

      public addGlobalModule(module: Module) {
        this.globalModules.add(module);
      }

      public getModules(): ModulesContainer {
        return this.modules;
      }

      public async addRelatedModule(
        relatedModule: Type<any> | DynamicModule,
        token: string,
      ) {
        Iif (!this.modules.has(token)) return;

        const module = this.modules.get(token);
        const parent = module.metatype;

        const scope = [].concat(module.scope, parent);
        const { token: relatedModuleToken } = await this.moduleCompiler.compile(
          relatedModule,
          scope,
        );
        const related = this.modules.get(relatedModuleToken);
        module.addRelatedModule(related);
      }

      public addComponent(component: Type<any>, token: string): string {
        if (!component) {
          throw new CircularDependencyException();
        }
        if (!this.modules.has(token)) {
          throw new UnknownModuleException();
        }
        const module = this.modules.get(token);
        return module.addComponent(component);
      }

      public addInjectable(injectable: Type<any>, token: string) {
        Eif (!this.modules.has(token)) {
          throw new UnknownModuleException();
        }
        const module = this.modules.get(token);
        module.addInjectable(injectable);
      }

      public addExportedComponent(exportedComponent: Type<any>, token: string) {
        if (!this.modules.has(token)) {
          throw new UnknownModuleException();
        }
        const module = this.modules.get(token);
        module.addExportedComponent(exportedComponent);
      }

      public addController(controller: Type<any>, token: string) {
        if (!this.modules.has(token)) {
          throw new UnknownModuleException();
        }
        const module = this.modules.get(token);
        module.addRoute(controller);
      }

      public clear() {
        this.modules.clear();
      }

      public replace(toReplace, options: any & { scope: any[] | null }) {
        [...this.modules.values()].forEach(module => {
          module.replace(toReplace, options);
        });
      }

      public bindGlobalScope() {
        this.modules.forEach(module => this.bindGlobalsToRelatedModules(module));
      }

      public bindGlobalsToRelatedModules(module: Module) {
        this.globalModules.forEach(globalModule =>
          this.bindGlobalModuleToModule(module, globalModule),
        );
      }

      public bindGlobalModuleToModule(module: Module, globalModule: Module) {
        if (module === globalModule) {
          return undefined;
        }
        module.addRelatedModule(globalModule);
      }

      public getDynamicMetadataByToken(
        token: string,
        metadataKey: keyof DynamicModule,
      ): any[] {
        const metadata = this.dynamicModulesMetadata.get(token);
        Iif (metadata && metadata[metadataKey]) {
          return metadata[metadataKey] as any[];
        }
        return [];
      }

      public getReflector(): Reflector {
        return this.reflector;
      }

      public getExternalContextCreator(): ExternalContextCreator {
        if (!this.externalContextCreator) {
          this.externalContextCreator = ExternalContextCreator.fromContainer(this);
        }
        return this.externalContextCreator;
      }

      public getApplicationRefHost(): ApplicationReferenceHost {
        return this.applicationRefHost;
      }

      public getModulesContainer(): ModulesContainer {
        if (!this.modulesContainer) {
          this.modulesContainer = this.getModules();
        }
        return this.modulesContainer;
      }
    }

    export interface InstanceWrapper<T> {
      name: any;
      metatype: Type<T>;
      instance: T;
      isResolved: boolean;
      isPending?: boolean;
      done$?: Promise<void>;
      inject?: Type<any>[];
      isNotMetatype?: boolean;
      forwardRef?: boolean;
      async?: boolean;
    }