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@kibibit/configit

v2.11.1

Published

a general typescript configuration service

Downloads

33,547

Readme

Unless forced to create a new service, this service will return the first created service

Usage

Create a new class to define your configuration. The class should extend the Config class from this repo

import { IsNumber, IsString } from 'class-validator';

import { BaseConfig, Configuration, ConfigVariable } from '@kibibit/configit';

@Configuration()
export class ProjectConfig extends BaseConfig {
  @ConfigVariable('Server port')
  @IsNumber()
  PORT: number;

  @ConfigVariable([
    'This is the slack API to talk and report to channel "hello"'
  ])
  @IsString()
  SLACK_API_KEY: string;
}

}

Then, in your code, initialize the config service when you bootstrap your application

import express from 'express';
import { ConfigService } from '@kibibit/configit';
import { ProjectConfig } from './project-config.model';

export const configService = new ConfigService<ProjectConfig>(ProjectConfig);
const app = express();

app.get( '/', ( req, res ) => {
  res.send( 'Hello world!' );
} );

app.listen(configService.config.PORT, () => {
  console.log(
    `server started at http://localhost:${ configService.config.PORT }`
  );
});

Extending the Configuration Service (Recommended)

You can extend the configuration to add your own customization and functions!

import { chain } from 'lodash';

import { ConfigService, IConfigServiceOptions } from '@kibibit/configit';
import { WinstonLogger } from '@kibibit/nestjs-winston';

import { ExtProjectConfig } from './ext-project-config.model';
import { initializeWinston } from './winston.config';

export class ExtConfigService extends ConfigService<ExtProjectConfig> {
  public logger: WinstonLogger;
  constructor(passedConfig?: Partial<ExtProjectConfig>, options: IConfigServiceOptions = {}) {
    super(ExtProjectConfig, passedConfig, options);

    initializeWinston(this.appRoot);
    this.logger = new WinstonLogger('');
  }

  getSlackApiObject() {
    const slackApiObject = chain(this.toPlainObject())
      .pickBy((value, key) => key.startsWith('SLACK_'))
      .mapKeys((value, key) => key.replace(/^SLACK_/i, ''))
      .mapKeys((value, key) => key.toLowerCase())
      .value();

    return slackApiObject;
  }
}

export const configService = new ExtConfigService() as ExtConfigService;

Features

  • Supports JSON\YAML files\env variables\cli flags as configuration inputs. See yaml-config in the examples folder
  • Supports shared configuration files (same file shared for multiple projects)
  • initialize a configuration file with --saveToFile or --init
  • save configuration files anywhere above your project's package.json
  • forced singleton for a single installation (reuse same class)
  • testable
  • The ability to create json schemas automatically and add descriptions to configuration variables
  • Get meaningfull errors when configuration is wrong!

Examples

See the examples folder for a variety of usage examples

Contributors ✨

Thanks goes to these wonderful people (emoji key):

This project follows the all-contributors specification. Contributions of any kind are welcome!

Stay in touch