importing flatbuffers correctly with typescript

In typescript I am using flatbuffers like this:

import {flatbuffers} from 'flatbuffers';const builder = new flatbuffers.Builder(1);

then I compile to js to be use with react-native:

const flatbuffers_1 = require("flatbuffers");const builder = new flatbuffers_1.flatbuffers.Builder(1);

but I get error:

undefined is not an object (evaluating 'new flatbuffers_1.flatbuffers.Builder')

What happen?