Prepend all JavaScript files with "use strict"; that don't have it yet

prepend-use-strict.js

// To run:
// npm install globby
// node prepend-use-strict.js

var globby = require('globby');
var fs = require('fs');

globby('**/*.js', function(err, files) {
    for (var i = 0, m = files.length; i < m; i++) {
        var fileContent = fs.readFileSync(files[i]).toString();
        if (!fileContent.match("use strict")) {
            fileContent = "\"use strict\";\n\n" + fileContent;
            fs.writeFileSync(files[i], fileContent);
        }
    }
});

Add this to NPM!

You're a lifesaver, thank you for this!