module.exports = function (defs) {

var used = [];

var usedResult = [];

var fork = {};

function use(plugin) {

var idx = used.indexOf(plugin);

if (idx === -1) {

idx = used.length;

used.push(plugin);

usedResult[idx] = plugin(fork);

}

return usedResult[idx];

}

fork.use = use;

var types = use(require('./lib/types'));

defs.forEach(use);

types.finalize();

var exports = {

Type: types.Type,

builtInTypes: types.builtInTypes,

namedTypes: types.namedTypes,

builders: types.builders,

defineMethod: types.defineMethod,

getFieldNames: types.getFieldNames,

getFieldValue: types.getFieldValue,

eachField: types.eachField,

someField: types.someField,

getSupertypeNames: types.getSupertypeNames,

astNodesAreEquivalent: use(require("./lib/equiv")),

finalize: types.finalize,

Path: use(require('./lib/path')),

NodePath: use(require("./lib/node-path")),

PathVisitor: use(require("./lib/path-visitor")),

use: use

};

exports.visit = exports.PathVisitor.visit;

return exports;

};