flow-runtime/lib/globalContext.js

import registerPrimitiveTypes from './registerPrimitiveTypes';
import registerBuiltinTypeConstructors from './registerBuiltins';
import registerTypePredicates from './registerTypePredicates';

import TypeContext from './TypeContext';

var globalContext = new TypeContext();
registerPrimitiveTypes(globalContext);
registerBuiltinTypeConstructors(globalContext);
registerTypePredicates(globalContext);

export default globalContext;