Code Explainers

Code explainers tagged #fail-fast

typescript 
import { Module } from '@nestjs/common';
import { ConfigModule } from '@nestjs/config';
import * as Joi from 'joi';
 

Validating env config at boot in NestJS

configuration schema-validation environment-variables
Intermediate 8 steps
ruby 
class PaymentGateway
  class MissingCredentialError < StandardError; end
 
  def initialize(env: Rails.env)

Wrapping Rails credentials in a gateway

encapsulation credentials error handling
Intermediate 6 steps
typescript 
import { Module, Injectable } from '@nestjs/common';
import { ConfigModule, ConfigService } from '@nestjs/config';
import * as Joi from 'joi';
 

Validated, typed config in NestJS

configuration validation dependency-injection
Intermediate 6 steps