invar

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:nut_and_bolt: Expressive runtime invariants for JavaScript

invar 최신버젼 다운로드

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// repository documentation

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The reign of poor error messages is over! Expressive runtime invariants for JavaScript.

## Installation

$ npm install invar --save

## Usage

```javascript
import invar from 'invar'
```

---

### `invar(message)`

Check for truthiness.

#### Example

```javascript
invar(2 + 2 === 5, "I'm sorry Dave, I'm afraid I can't do that.")
```
 
#### Throws

Invariant Violation: I'm sorry Dave, I'm afraid I can't do that.

---

### `invar.equal(actual, expected, message)`

Check for shallow equality.

#### Example

```javascript
invar.equal(2 + 2, 5, "Daisy, Daisy, give me your answer do.")
```

#### Throws

Invariant Violation: Daisy, Daisy, give me your answer do.
        actual: 4
      expected: 5

---

### `invar.notEqual(actual, expected, message)`

Check for shallow unequality.

#### Example

```javascript
invar.notEqual(2 + 2, 4, "I've just picked up a fault in the AE35 unit.")
```

#### Throws

Invariant Violation: I've just picked up a fault in the AE35 unit.
        actual: 4
      expected: not 4

---

### `invar.req(arg)`

Always fail. Used for mandatory function arguments.

#### Example

```javascript
function myFunction (mandatoryArg = invar.req('mandatoryArg')) {}
myFunction()
```

#### Throws

Invariant Violation: Required argument 'mandatoryArg' not provided.

---

### `invar.fail(message)`

Always fail.

#### Example

```javascript
invar.fail("I'm afraid. I'm afraid, Dave. Dave, my mind is going.")
```

#### Throws

Invariant Violation: I'm afraid. I'm afraid, Dave. Dave, my mind is going.

## Development

Invar uses [JavaScript Standard Style](https://github.com/feross/standard), [Babel](https://babeljs.io/) for ES6+ support, and [Jest](http://facebook.github.io/jest/) for testing.

$ git clone git@github.com:pavlovml/invar.git
    $ make test

To run the tests on file changes:

$ env WATCH=true make test

## License

[BSD 3-Clause](https://github.com/pavlovml/invar/blob/master/LICENSE)

invar

invar 최신버젼 다운로드

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invar

invar 최신버젼 다운로드

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