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Can't use Intl.NumberFormat without Debug JS Remotely turned on #15382

vendramini opened this Issue Aug 5, 2017 · 3 comments


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vendramini commented Aug 5, 2017

Is this a bug report?

I think so.

Have you read the Contributing Guidelines?



  1. react-native -v: 0.46.4, cli: 2.0.1
  2. node -v: 8.2.1
  3. npm -v: 5.3.0

Then, specify:

  • Target Platform: Both, but I just tested on Android for now.
  • Development Operating System: Linux Mint 17
  • Build tools: I use JetBrains PHPStorm to code. Build with default react-native run-*

Steps to Reproduce

(Write your steps here:)

  1. Try to use a simple code:
export const formatReal = (value) => {
    const formatter = new Intl.NumberFormat('pt-BR', {
        style: 'currency',
        currency: 'BRL',
        minimumFractionDigits: 2,

    return formatter.format(value);
  1. Works if the debugger is conected.
  2. Turn off debugger from device.
  3. Explodes an error: "Can't find variable: Intl".

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hey99xx commented Aug 6, 2017

It's very possible that Chrome has Intl defined, but Android JSC engine which is closer to iOS 8's JSC engine doesn't. This is not a bug with react-native; you'll always see newer JS variables / functions while working with a debugger that what ships with your app. For example localeCompare would also behave differently according to #12597

You'll need to polyfill Intl on Android with a package such as


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newyankeecodeshop commented Aug 7, 2017

You can also use SoftwareMansion's work which brings an updated JavaScriptCore to Android:

The version roughly matches the JavaScriptCore bundled with iOS 10.3, so it has many of the modern JavaScript APIs, including Intl. Note that there is a special build that includes the full locale stack. I've started using this in a React Native project, and it works very well.


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vendramini commented Aug 7, 2017

@newyankeecodeshop very interesting, I will use this on future apps.

I solved using @hey99xx solution. I'm just importing intl and specifics locales.

Thank you, guys!

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