Is it possible to access types and methods, etc, from the util.api.md file?

[marcusx2]

For example, the following

// @public (undocumented)
export function createMockUserToken(token: EmulatorMockTokenOptions, projectId?: string): string;

seems to be public, but undocumented. How can I access this function? I tried things like

import { createMockUserToken } from 'https://www.gstatic.com/firebasejs/10.3.0/firebase-util.js'
import { createMockUserToken } from 'https://www.gstatic.com/firebasejs/10.3.0/firebase-utils.js'
import { createMockUserToken } from 'https://www.gstatic.com/firebasejs/10.3.0/firebase-emulator.js'
import { createMockUserToken } from 'https://www.gstatic.com/firebasejs/10.3.0/firebase-emulators.js'

but it doesn't work. It doesn't look like the utils package is exposed for end users. Is there some way I can access this api, or is it intentionally hidden?