All files index.ts

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import Config from "./config";
import ProductionConfig from "./production-config";
import TestConfig from "./test-config";
 
export default class Configuration {
  private _config: Config;
  public apiKey: string;
 
  constructor(apiKey?: string) {
    if (!(apiKey || process.env.SENDGRID_API_KEY)) {
      throw new Error(
        "[ProductionConfiguration.constructor] SENDGRID_API_KEY undefined."
      );
    }
 
    this.apiKey = apiKey || process.env.SENDGRID_API_KEY;
  }
 
  public get config(): Config {
    if (typeof this._config !== "undefined") {
      return this._config;
    }
 
    if (process.env.NODE_ENV === "test") {
      this._config = new TestConfig();
    } else {
      this._config = new ProductionConfig();
    }
 
    return this._config;
  }
}