Created
May 2, 2022 05:41
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NestJS get injected instance by name
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| // Pull out instance of a class from moduleContainer | |
| // 'nicer' alternative to globals | |
| // loops over all instances in a module, so probably don't do this at runtime | |
| import {Injectable, Inject} from "@nestjs/common"; | |
| import {ConfigType} from "@nestjs/config"; | |
| import {ModulesContainer} from "@nestjs/core"; | |
| import {InstanceWrapper} from "@nestjs/core/injector/instance-wrapper"; | |
| const config.name = 'MyInjectedClass'; | |
| const instances = Array.from(this.modulesContainer.values()) | |
| .map((module) => { | |
| return Array.from(module['providers'].values()) | |
| }).reduce((arr1, arr2) => { | |
| return arr1.concat(arr2); | |
| }).filter((instance: InstanceWrapper) => { | |
| return instance.name === config.name; | |
| }); | |
| if (instances.length > 1) { | |
| throw new Error(`More than one injected instance of ${config.name} - in this module`); | |
| } | |
| if (instances.length === 0) { | |
| throw new Error(`No injected instances of ${config.name} - please inject it somewhere`); | |
| } | |
| const instance = instances[0].instance as InstanceType < any > ; |
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