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react-firebaseui18 lists no main file and has no index.js, so it can't be directly required. If this is a mistake, please let us know. It may however contain internal files that you can require manually:
require("firebase/package.json"); // firebase is a peer dependency.
require("react/package.json"); // react is a peer dependency.
// require("react-firebaseui18/[??]")
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