build.js

// This file was generated by modules-webmake (modules for web) project.
// See: https://github.com/medikoo/modules-webmake

(function (modules) {
	var getModule, getRequire, require;
	getModule = (function (wrap) {
		return function (scope, tree, path, fullpath) {
			var name, dir, exports, module, fn, isDir;
			path = path.split('/');
			name = path.pop();
			if (!name) {
				isDir = true;
				name = path.pop();
			}
			if ((name === '.') || (name === '..')) {
				path.push(name);
				name = '';
			}
			while ((dir = path.shift())) {
				if (dir === '..') {
					scope = tree.pop();
				} else if (dir !== '.') {
					tree.push(scope);
					scope = scope[dir];
					if (!scope) {
						throw new Error("Could not find module '" + fullpath + "'");
					}
				}
			}
			if (name) {
				if (!isDir && scope[name + '.js']) {
					name += '.js';
				}
				if (typeof scope[name] === 'object') {
					tree.push(scope);
					scope = scope[name];
					name = 'index.js';
				}
			} else {
				name = 'index.js';
			}
			fn = scope[name];
			if (!fn) throw new Error("Could not find module '" + fullpath + "'");
			if (fn.hasOwnProperty('module')) return fn.module.exports;
			exports = {};
			fn.module = module = { exports: exports };
			fn.call(exports, exports, module, getRequire(scope, tree));
			return module.exports;
		};
	}(function (cmodule) {
		return function (ignore, module) {
			module.exports = cmodule.exports;
		};
	}));
	require = function (scope, tree, fullpath) {
		var name, path = fullpath, t = fullpath.charAt(0);
		if (t === '/') {
			path = path.slice(1);
			scope = modules['/'];
			tree = [];
		} else if (t !== '.') {
			name = path.split('/', 1)[0];
			scope = modules[name];
			tree = [];
			path = path.slice(name.length + 1) || scope[':mainpath:'];
		}
		return getModule(scope, tree, path, fullpath);
	};
	getRequire = function (scope, tree) {
		return function (path) {
			return require(scope, [].concat(tree), path);
		};
	};
	return getRequire(modules, []);
})({
	"foo": {
		"add.js": function (exports, module, require) {
			module.exports = function() {
				var sum = 0, i = 0, args = arguments, l = args.length;
				while (i < l) sum += args[i++];
				return sum;
			};
		},
		"increment.js": function (exports, module, require) {
			var add = require('./add');
			module.exports = function(val) {
				return add(val, 1);
			};

		},
		"program.js": function (exports, module, require) {
			var inc = require('./increment');
			var a = 1;
			inc(a); // 2
		}
	}
}
})("foo/program");

split.js

// add.js file
if (!window._modules.foo){
    window._modules.foo = {}
}
window._modules.foo['add.js'] = function (exports, module, require) {
    module.exports = function () {
        var sum = 0, i = 0, args = arguments, l = args.length;
        while (i < l) sum += args[i++];
        return sum;
    };
}

// increment.js

if (!window._modules.foo){
    window._modules.foo = {}
}
window._modules.foo['increment.js'] = function (exports, module, require) {
    var add = require('./add');
    module.exports = function (val) {
        return add(val, 1);
    };
}

//  file

if (!window._modules.foo){
    window._modules.foo = {}
}

window._modules.foo['program.js'] = function (exports, module, require) {
	var inc = require('./increment');
	var a = 1;
	inc(a); // 2
}

//

(function (modules) {
	var getModule, getRequire, require;
	getModule = (function (wrap) {
		return function (scope, tree, path, fullpath) {
			var name, dir, exports, module, fn, isDir;
			path = path.split('/');
			name = path.pop();
			if (!name) {
				isDir = true;
				name = path.pop();
			}
			if ((name === '.') || (name === '..')) {
				path.push(name);
				name = '';
			}
			while ((dir = path.shift())) {
				if (dir === '..') {
					scope = tree.pop();
				} else if (dir !== '.') {
					tree.push(scope);
					scope = scope[dir];
					if (!scope) {
						throw new Error("Could not find module '" + fullpath + "'");
					}
				}
			}
			if (name) {
				if (!isDir && scope[name + '.js']) {
					name += '.js';
				}
				if (typeof scope[name] === 'object') {
					tree.push(scope);
					scope = scope[name];
					name = 'index.js';
				}
			} else {
				name = 'index.js';
			}
			fn = scope[name];
			if (!fn) throw new Error("Could not find module '" + fullpath + "'");
			if (fn.hasOwnProperty('module')) return fn.module.exports;
			exports = {};
			fn.module = module = { exports: exports };
			fn.call(exports, exports, module, getRequire(scope, tree));
			return module.exports;
		};
	}(function (cmodule) {
		return function (ignore, module) {
			module.exports = cmodule.exports;
		};
	}));
	require = function (scope, tree, fullpath) {
		var name, path = fullpath, t = fullpath.charAt(0);
		if (t === '/') {
			path = path.slice(1);
			scope = modules['/'];
			tree = [];
		} else if (t !== '.') {
			name = path.split('/', 1)[0];
			scope = modules[name];
			tree = [];
			path = path.slice(name.length + 1) || scope[':mainpath:'];
		}
		return getModule(scope, tree, path, fullpath);
	};
	getRequire = function (scope, tree) {
		return function (path) {
			return require(scope, [].concat(tree), path);
		};
	};
	return getRequire(modules, []);
})(window._modules)("foo/program");