lib/transforms/executeJavaScriptInOrder.js

var vm = require('vm');

// Only really makes sense when queryObj matches a single initial asset.
module.exports = function (queryObj, context) {
    if (typeof queryObj === 'undefined') {
        throw new Error('executeJavaScriptInOrder: The queryObj parameter is mandatory.');
    }
    return function executeJavaScriptInOrder(assetGraph) {
        if (!context) {
            context = vm.createContext();
        }
        var assetsInOrder = [];
        assetGraph.findAssets(queryObj).forEach(function (initialAsset) {
            Array.prototype.push.apply(assetsInOrder, assetGraph.collectAssetsPostOrder(initialAsset, {to: {type: 'JavaScript'}}));
        });
        assetsInOrder.forEach(function (asset) {
            try {
                vm.runInContext(asset.text, context, asset.url || '(inline)');
            } catch (e) {
                // Script.runInContext won't report the file name on error until node.js 0.5.5:
                // https://github.com/joyent/node/commit/c05936ca13681059c7aeecfe3a608e4e1afa800a
                throw new Error('transforms.executeJavaScriptInOrder: Error in ' + (asset.url || '(inline script)') + ":\n" + e.stack);
            }
        });
    };
};