asset.downloadAsync is not a function

I seem to be getting an error with the async loading.

My code looks a little like this in my App.js;

import React from 'react'
import PropTypes from 'prop-types'
import { MaterialIcons, MaterialCommunityIcons } from '@expo/vector-icons'

import { AppLoading } from 'expo'
import { Asset } from 'expo-asset'
import * as Font from 'expo-font'

import './src/shared/config'

import Rubik from './assets/fonts/Rubik-Regular.ttf'
import RubikItalic from './assets/fonts/Rubik-Italic.ttf'
import RubikMedium from './assets/fonts/Rubik-Medium.ttf'
import RubikMediumItalic from './assets/fonts/Rubik-MediumItalic.ttf'

import iconInverted from './assets/images/icon-inverted.png'
import logoInverted from './assets/images/logo-inverted.png'
import logoPrimary from './assets/images/logo-primary.png'
import signInBackground from './assets/images/sign-in-background.png'
import splash from './assets/images/splash.png'

import HybridApp from './src/HybridApp'

global.Intl = require('intl')

class App extends React.Component {
  state = {
    isLoadingComplete: false,

  loadResourcesAsync = async () => {
    console.warn('loading async...')
    return Promise.all([
        // Preload assets here....
        rubik: Rubik,
        'rubik-italic': RubikItalic,
        'rubik-medium': RubikMedium,
        'rubik-medium-italic': RubikMediumItalic,

  handleLoadingError = error => {
    // In this case, you might want to report the error to your error
    // reporting service, for example Sentry

  handleFinishLoading = () => {
    console.warn('finish loading...')
    // this.setState({ isLoadingComplete: true })

  render = () => {
    const { isLoadingComplete } = this.state
    const { skipLoadingScreen } = this.props
    if (!isLoadingComplete && !skipLoadingScreen) {
      return (
    return <HybridApp />

App.propTypes = {
  skipLoadingScreen: PropTypes.bool,

export default App

This is a pretty close match to the example code that is found on Expo.

I am getting an error in the console;

TypeError: asset.downloadAsync is not a function
    at _loadSingleFontAsync$ (Font.js:87)
    at tryCatch (runtime.js:45)
    at Generator.invoke [as _invoke] (runtime.js:271)
    at Generator.prototype.<computed> [as next] (runtime.js:97)
    at tryCatch (runtime.js:45)
    at invoke (runtime.js:135)
    at runtime.js:170
    at tryCallTwo (core.js:45)
    at doResolve (core.js:200)
    at new Promise (core.js:66)

And i then get an error on screen about using Rubik before it’s ready. I am unsure why this is. I can only assume that something is falling over in the Font import?

Hey @alexborton- is this in a managed Expo project? If it is, make sure you’ve run expo install expo-asset

Besides that, I’d try and see if clearing node_modules and reinstalling solves the issue

I am having the same issue, it only seemed to start happening after I updated Expo to 33 I’m pretty sure (though it could have been at some point when I went from 28 -> 32).

After reading your reply I installed expo-asset and cleared node_modules but it did not seem to make any difference.

I ended up removing these Material and MaterialCommunity fonts from the Font.loadAsync

Doesn’t appear that i need to pre-load them, so for simplicity, i’m not anymore

Yeah, I also stopped preloading them, but it continued to complain that I was using the font before it was loaded so I started using Roboto instead of Roboto_Medium, though I am still seeing the warning show up in the logs.

I have the same issue. Upgrade to Expokit 33.
Is the error caused by Asset.loadAsync or Font.loadAsync?

This topic was automatically closed 15 days after the last reply. New replies are no longer allowed.