Bunker is a module to calculate code coverage using native javascript burrito AST trickery.

var bunker = require('bunker');
var b = bunker('var x = 0; for (var i = 0; i < 30; i++) { x++ }');

var counts = {};

b.on('node', function (node) {
    if (!counts[node.id]) {
        counts[node.id] = { times : 0, node : node };
    }
    counts[node.id].times ++;
});

b.run();

Object.keys(counts).forEach(function (key) {
    var count = counts[key];
    console.log(count.times + ' : ' + count.node.source());
});

output:

$ node example/tiny.js 
1 : var x=0;
31 : i<30
30 : i++
30 : x++;
30 : x++

var bunker = require('bunker');

Create a new bunker code coverageifier with some source src.

The bunker object b is an EventEmitter that emits 'node' events with two parameters:

• node - the burrito node object
• stack - the stack, stackedy style

Include some source into the bunker.

Return the source wrapped with burrito.

Assign the statement-tracking functions into context.

Run the source using vm.runInNewContext() with some context. The statement-tracking functions will be added to context by assign().