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# Consola

> Elegant Console Logger for Node.js and Browser

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## Why Consola?

👌&nbsp; Easy to use<br>
💅&nbsp; Fancy output with fallback for minimal environments<br>
🔌&nbsp; Pluggable reporters<br>
💻&nbsp; Consistent command line interface (CLI) experience<br>
🏷&nbsp; Tag support<br>
🚏&nbsp; Redirect `console` and `stdout/stderr` to consola and easily restore redirect.<br>
🌐&nbsp; Browser support<br>
⏯&nbsp; Pause/Resume support<br>
👻&nbsp; Mocking support<br>
👮‍♂️&nbsp; Spam prevention by throttling logs<br>

## Installation

Using yarn:

```bash
yarn add consola
```

Using npm:

```bash
npm i consola
```

## Getting Started

```js
const consola = require('consola')

// See types section for all available types

consola.success('Built!')
consola.info('Reporter: Some info')
consola.error(new Error('Foo'))
```

Will display in the terminal:

![Screenshot 2020-01-28 at 14 15 15](https://user-images.githubusercontent.com/904724/73267133-af6b2f00-41d8-11ea-9f16-4a8243d19c43.png)

**NOTE:** Alternatively, you can import consola from source. But don't forget to whitelist it for transpilation:

```js
import consola from 'consola/src/node'
import consola from 'consola/src/browser'
```

## Methods

#### `<type>(logObject)` `<type>(args...)`

Log to all reporters.

Example: `consola.info('Message')`

A list of available types can be found [here](./src/types.js).

#### `addReporter(reporter)`

- Aliases: `add`

Register a custom reporter instance.

#### `removeReporter(reporter?)`

- Aliases: `remove`, `clear`

Remove a registered reporter.

If no arguments are passed all reporters will be removed.

#### `setReporters(reporter|reporter[])`

Replace all reporters.

#### `create(options)`

Create a new `Consola` instance and inherit all parent options for defaults.

#### `withDefaults(defaults)`

Create a new `Consola` instance with provided defaults

#### `withTag(tag)`

- Aliases: `withScope`

Create a new `Consola` instance with that tag.

#### `wrapConsole()` `restoreConsole()`

Globally redirect all `console.log`, etc calls to consola handlers.

#### `wrapStd()` `restoreStd()`

Globally redirect all stdout/stderr outputs to consola.

#### `wrapAll()` `restoreAll()`

Wrap both, std and console.

console uses std in the underlying so calling `wrapStd` redirects console too.
Benefit of this function is that things like `console.info` will be correctly redirected to the corresponding type.

#### `pauseLogs()` `resumeLogs()`

- Aliases: `pause`/`resume`

**Globally** pause and resume logs.

Consola will enqueue all logs when paused and then sends them to the reported when resumed.

#### `mockTypes`

- Aliases: `mock`

Mock all types. Useful for using with tests.

The first argument passed to `mockTypes` should be a callback function accepting `(typeName, type)` and returning the mocked value:

```js
consola.mockTypes((typeName, type) => jest.fn())
```

Please note that with the example above, everything is mocked independently for each type. If you need one mocked fn create it outside:

```js
const fn = jest.fn()
consola.mockTypes(() => fn)
```

If callback function returns a _falsy_ value, that type won't be mocked.

For example if you just need to mock `consola.fatal`:

```js
consola.mockTypes((typeName) => typeName === 'fatal' && jest.fn())
```

**NOTE:** Any instance of consola that inherits the mocked instance, will apply provided callback again.
This way, mocking works for `withTag` scoped loggers without need to extra efforts.

## Fields

#### `reporters`

An array of active reporters.

#### `level`

The level to display logs. Any logs at or above this level will be displayed.
List of available levels [here](./src/types.js).

You can set the log level using the `CONSOLA_LEVEL` environment variable, which must have the numeric log level as its value.

## `logObject`

The `logObject` is a free-to-extend object which will be passed to reporters.

Standard fields:

- `message`
- `additional`
- `args`
- `date`
- `tag`

Extra fields:

- `badge`

## Reporters

Choose between one of the built-in reporters or bring in your own one.

By default `FancyReporter` is registered for modern terminals or `BasicReporter` will be used if running in limited environments such as CIs.

Available reporters:

- [BasicReporter](./src/reporters/basic.js)
- [FancyReporter](./src/reporters/fancy.js)
- [JSONReporter](./src/reporters/json.js)
- [WinstonReporter](./src/reporters/winston.js)

### Creating your own reporter

A reporter (class or object) exposes `log(logObj)` method.
To get more info about how to write your own reporter, take a look into the linked implementations above.

## Types

Types are used to actually log messages to the reporters.
Each type is attached to a _logging level_.

A list of all available default types is [here](./src/types.js).

## Creating a new instance

Consola has a global instance and is recommended to use everywhere.
In case more control is needed, create a new instance.

```js
import consola from 'consola'

const logger = consola.create({
    // level: 4,
    reporters: [
      new consola.JSONReporter()
    ],
    defaults: {
      additionalColor: 'white'
    }
})
```

## Integrations

### With jest

```js
describe('your-consola-mock-test', () => {
  beforeAll(() => {
      // Redirect std and console to consola too
      // Calling this once is sufficient
      consola.wrapAll()
    })

    beforeEach(() => {
      // Re-mock consola before each test call to remove
      // calls from before
      consola.mockTypes(() => jest.fn())
    })


  test('your test', async () => {
    // Some code here

    // Let's retrieve all messages of `consola.log`
    // Get the mock and map all calls to their first argument
    const consolaMessages = consola.log.mock.calls.map(c => c[0])
    expect(consolaMessages).toContain('your message')
  })

})
```

### With jsdom

```js
{
  virtualConsole: new jsdom.VirtualConsole().sendTo(consola)
}
```

## License

MIT - Made with 💖 By Nuxt.js team!

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