Function collectLibs

test/fixtures/snapshot/typescript.js:108411–108419

(sourceFile, ret)

            return ret;
        }
        function collectLibs(sourceFile, ret) {
            ts.forEach(sourceFile.libReferenceDirectives, function (ref) {
                var lib = host.getLibFileFromReference(ref);
                if (lib) {
                    ret.set(ts.toFileNameLowerCase(ref.fileName), true);
                }
            });
            return ret;
        }
        function filterBindingPatternInitializers(name) {
            if (name.kind === 79 /* SyntaxKind.Identifier */) {
                return name;