# mr-error

> Build and handle errors in the way they deserve.

Latest version **0.7.3** (published 2022-01-06) · ISC license · 0 weekly downloads

## Install

```sh
npm install mr-error
pnpm add mr-error
yarn add mr-error
bun add mr-error
```

## Health

**Score 25/100 (F)** — status: abandoned.

Positive: has types; no vulnerabilities; high quality score.

Warnings: low downloads; no esm support; pre 1.0.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 0.7.3 |
| Published | 2022-01-06 |
| First published | 2021-01-30 |
| Weekly downloads | 0 |
| License | ISC |
| TypeScript types | bundled |
| Module format | CommonJS |
| Dependencies | 0 |
| Unpacked size | 7 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 0 |
| Author | Ilia Donskikh |
| Maintainers | donivnpm |
| Keywords | errors |

## Links

- npm: https://www.npmjs.com/package/mr-error
- Repository: https://github.com/IlyaDonskikh/mr-error
- Homepage: https://github.com/IlyaDonskikh/mr-error#readme
- Issues: https://github.com/IlyaDonskikh/mr-error/issues
- npm.io page: https://npm.io/package/mr-error

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- [@suchipi/error-utils](https://npm.io/package/@suchipi/error-utils.md) — 78 weekly downloads

## Recent versions

- 0.7.3 (latest) — 2022-01-06
- 0.7.2 — 2022-01-06
- 0.7.1 — 2021-05-18
- 0.7.0 — 2021-04-03
- 0.6.1 — 2021-01-31
- 0.6.0 — 2021-01-30
- 0.5.0 — 2021-01-30

## README

# Mr.Error

![Node.js CI Tests](https://github.com/IlyaDonskikh/mr-error/actions/workflows/node.js.yml/badge.svg?branch=master)

The right way to bake errors.

<img width="200" alt="mr error" src="https://user-images.githubusercontent.com/3100222/118550668-a273a580-b765-11eb-882e-6c686a264b3d.png">

## Introduction

Errors building is one of the most common tasks in software development. `Mr.Error` gladly provides high-quality service to help your application cover all needs in this field.

Make errors your friends🤝 , not your enemies.

## Installation

Just one step.

```shell
npm i mr-error
```

And use it where you need it.

```typescript
import { MrError } from 'mr-error';
```

## Overview

This section explains how to generate, merge and even localize errors.

> Have a look at [🐨 Mr.Koa](https://github.com/IlyaDonskikh/mrkoa) boilerplate and [💼 Mr.UseCase](https://github.com/IlyaDonskikh/mr-use-case) package if you want to see `Mr.Error` in ready-to-use environment.

#### Generation

Let's create an instance and add a few errors:

```typescript
const instance = new MrError();

instance.add('email', 'format');
instance.add('password', 'length');
instance.add('password', 'length');
instance.add('password', 'security');

instance.errors; // => { email: ['format'], password: ['length', 'security'] }
```

As you see, `Mr.Error` is doing its work pretty well. It groups these errors and removes duplicates.

#### Merge

Now let's assume that we need to collect errors from different instances.

```typescript
const instanceFirst = new MrError();
const instanceSecond = new MrError();

instanceFirst.add('email', 'format');
instanceSecond.add('password', 'length');
instanceFirst.merge(instanceSecond);

instanceFirst.errors; // => { email: ['format'], password: ['length'] }
```

It seems that `Mr.Error` doesn't even break a sweat.

#### Localization

The localization feature is enabled with the help of the [i18n](https://github.com/mashpie/i18n-node) package.

```typescript
import i18n from 'i18n';

i18n.configure({
  locales: ['en'],
  directory: `${__dirname}/locales`,
  objectNotation: true,
  updateFiles: false,
  defaultLocale: 'en',
  staticCatalog: {
    en: require(`${__dirname}/locales/en`),
  },
});

class MrErrorLocalized extends MrError {
  protected localizationPackage = i18n;
}
```

Where `locales/en/index.js` contains:

```js
module.exports = {
  test: {
    text: {
      length: 'The text should be at least {{min}} characters long.',
    },
  },
};
```

Now we can utilise all localization power of `i18n` under `Mr.Error` hood. So, let's localize something.

```typescript
const instance = new MrErrorLocalized({ localePath: 'test' }); // default 'base'

instanceFirst.add('text', 'length', { replacements: { min: 10 } });

instance.messages(); // => { text: ['The text should be at least 10 characters long.'] }
```

As you may notice, `Mr.Error` not only perfectly localizes the error, but passes some information to localization data as well.

## Conclusion

`Mr.Error` is ready to take the role of error builder and has a simple interface to work with.

Give it a try!

---
_Source: https://npm.io/package/mr-error · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._