# Getting Started Guide (nodejs version)

This guide details using Blanket.js with a simple mocha test setup in NodeJS.

To begin you will need:
* an existing mocha tests (including the mocha module, `npm install mocha -g`)
* source files

1. Install Blanket: `npm install blanket`

2. Add the following to your package.json file:

```json
{
    "config": {
      "blanket": {
        "pattern": <string to match to source file paths>
      }
    }
}
```   
    
   If you omit this from your package.json, Blanket will default to "src".

   Alternatively, you may use `data-cover-never` to specify paths that should **not* be included, like so:

```json
{
    "config": {
      "blanket": {
        "pattern": [ "" ],
        "data-cover-never": [ "node_modules", "tests" ]
      }
    }
}
```   
   
   You may use an array of strings/ regexes instead of a single string/ regex.

3. Add Blanket as a require to your mocha command:

```mocha --require blanket```

4. Use the built-in html-cov reporter in mocha to display coverage results:

```mocha --require blanket -R html-cov > coverage.html```