Can't find variable: Symbol #498

KakarN · 2018-06-08T15:15:03Z

I am trying to integrate mobx/mobx-react into my react-native project. But I was stuck when I tried to import Provider into the main App.js.

I have this error:

Error: "Can't find variable: Symbol Evaluating module://mobx-react.js Evaluating module://App.js Loading module://App.js" in

On further checking I found that the latest version of the mobx/mobx-react was the problem. When I installed the old version, the error was gone.

You can check the latest mobx/mobx-react version snack here, which does not work.

And the old version of mobx/mobx-react version of snack here, which does work.

The text was updated successfully, but these errors were encountered:

mweststrate · 2018-06-08T19:45:20Z

Fixed in #499 and released as 5.2.2

KakarN · 2018-06-09T02:18:01Z

@mweststrate I am sorry, but I think it's not fixed yet. I have tried with the updated release version ("5.2.2"), but I am still getting the same error:

Error: "Can't find variable: Symbol Evaluating module://mobx.js Evaluating module://mobx-react.js Evaluating module://App.js Loading module://App.js" in

You can check the updated release version's snack here.

kennethnym · 2018-06-10T07:43:19Z

Same issue here with react-native@0.55.4 with mobx@5.0.0 and mobx-react@5.2.2. Downgrading mobx to 4.3.1 and mobx-react to 5.1.0 fixed the issue for me.

mweststrate · 2018-06-11T07:30:26Z

Should be fixed in 5.2.3

sasurau4 · 2018-06-11T09:22:02Z

Thank you for fixing!
But same issue here with react-native@0.54.4, mobx@5.0.0 and mobx-react@5.2.3 on Android emulator.
Turning on Debug JS Remotely fixed the issue for me.
snack here

mweststrate · 2018-06-11T09:35:56Z

MobX 5 doesn't work on RN Android, unless you upgrade your JavaScriptCore (See https://github.com/react-community/jsc-android-buildscripts#how-to-use-it-with-my-react-native-app). The default one is from 2014 (!!) and doesn't support any modern features and MobX 5 won't be compatible, use 4 instead Op ma 11 jun. 2018 om 11:22 schreef Daiki Ihara <notifications@github.com>:

…

Thank you for fixing! But same issue here with ***@***.***, ***@***.*** and ***@***.*** on Android emulator. Turning on Debug JS Remotely fixed the issue for me. snack here ***@***.***/mobx-react-updated-version> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#498 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABvGhAW08BkbCIwOnhM9f-lQkjY5fwAeks5t7ja7gaJpZM4UgfZd> .

sasurau4 · 2018-06-11T09:43:29Z

Oh I didn't know The default JavaScriptCore on Android is so old!!!
Think about upgrading jscore or using MobX v4 instead of v5.

Thanks!

juanamd · 2018-06-14T23:57:36Z

@mweststrate What you mention is really interesting; didn't know about RN and jsc.
I've tried your solution though, but it mentions that it requires a min sdk version of 21 for it to work. Is there any workaround to keep min version 16 while also being able to upgrade to mobx to v5.0+?

mweststrate · 2018-06-15T07:54:03Z

I have no clue about SDKs or something. I think that question is better asked at the repo that I linked to Op vr 15 jun. 2018 om 01:57 schreef Juan <notifications@github.com>:

…

@mweststrate <https://github.com/mweststrate> What you mention is really interesting; didn't know about RN and jsc. I've tried your solution though, but it mentions that it requires a min sdk version of 21 for it to work. Is there any workaround to keep min version 16 while also being able to upgrade to mobx to v5.0+? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#498 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABvGhHAt-VoNyj0AgMH4AW4xTvx0-19mks5t8vhxgaJpZM4UgfZd> .

z0nekill · 2018-07-04T08:23:59Z

Just followed the instructions that @mweststrate put together.. worked a treat!
cheers mate!

mobx: ^5.0.3
mobx-react: ^5.2.3
react-native: 0.55.4

Heads up as others are saying - the change requires setting the minimum android SDK version to 21. Otherwise you're looking at downgrading 👎

hvaoc · 2018-07-18T22:31:26Z

Version Info:

"mobx": "^5.0.3",
"mobx-react": "^5.2.3",
"react": "16.4.1",
"react-native": "^0.56.0"

Followed these steps based on @mweststrate 's response to fix this

Source: https://github.com/react-community/jsc-android-buildscripts#how-to-use-it-with-my-react-native-app

npm / yarn install jsc-android -D as dev dependency
Make changes to android gradle files

android/build.gradle

allprojects {
    repositories {
        mavenLocal()
        jcenter()
        maven {
            url 'https://maven.google.com'
        }
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../node_modules/react-native/android"
        }
        maven {
           // ADDED THIS - Local Maven repo containing AARs with JSC library built for Android
           url "$rootDir/../node_modules/jsc-android/dist" 
        }
    }
}

android/app/build.gradle

android {
   ...
   defaultConfig {
      minSdkVersion 21
   }
   ...
}

configurations.all {
    resolutionStrategy {
        force 'org.webkit:android-jsc:r224109'
    }
}

dependencies {
   ...
    compile 'org.webkit:android-jsc:r174650'    // ADDED THIS
   ...
}

tusharmutreja · 2018-08-09T11:22:19Z

MOBX COMPATIBILITY WITH react-native@0.56 ==> mobx to 4.3.1 and mobx-react to 5.1.0 .

tokinonagare · 2018-09-17T06:17:05Z

@hvaoc Thanks too much : ) you save my life.

Need to bump minimum Android SDK version to 21 too. Apparently, that error message is caused because older JavascriptCore doesn't support "Symbol". More: mobxjs/mobx-react#498 (comment)

pstanton · 2018-10-03T01:29:45Z

update to @tusharmutreja 's fine post:
"mobx": "^4.5.0",
"mobx-react": "^5.2.8",

works a treat.

JeffGuKang · 2018-10-23T10:20:16Z

update to @tusharmutreja 's fine post:
"mobx": "^4.5.0",
"mobx-react": "^5.2.8",

works a treat.

It works well on React-Native 0.57.

zdh · 2018-11-16T06:17:38Z

Same issue here with react-native@0.57.5 with mobx@5.6.0 and mobx-react@5.3.6.
Downgrading mobx to 4.3.1 or upgrade your JavaScriptCore.

That all works well on React-Native 0.57.5.

shuiRong · 2018-12-15T15:53:00Z

It's my setting: (works for me)
devDependencies

...
"@babel/plugin-proposal-decorators": "^7.2.2",
"metro-react-native-babel-preset": "0.50.0",
"babel-preset-mobx": "^2.0.0",
"jsc-android": "^236355.1.1",
 "mobx": "^5.8.0",
"mobx-react": "^5.4.3",
...

.babelrc

{
  "presets": ["module:metro-react-native-babel-preset","mobx"],
  "plugins": [
    ["@babel/plugin-proposal-decorators", { "legacy": true }]
  ]
}

and upgrade JavaScript Core

TyLy83 · 2018-12-17T21:33:10Z

Thank shuiRong,
Your solution work for me.

sanguineman91 · 2019-01-08T10:05:49Z

差评

lironhl · 2019-02-03T17:36:34Z

@hvaoc is declaring minSdkVersion 21, in android/app/build.gradle really necessary?

Needed to update the JavaScript Core to do this: mobxjs/mobx-react#498

igor90007 · 2019-03-04T18:48:42Z

"mobx": "4.9.2",
"mobx-react": "5.4.3",
"react-native": "0.58.6",
works good

mweststrate · 2019-03-04T19:42:37Z

Locking conversation, too many random comments that don't add anything to the conversation. Please open a new issue if still running into trouble not solved by what has been mentioned before already

KakarN mentioned this issue Jun 8, 2018

Can't find variable: Symbol mobxjs/mobx#1582

Closed

mweststrate closed this as completed Jun 8, 2018

Arrnas mentioned this issue Oct 2, 2018

Update native projects mysteriumnetwork/mysterium-vpn-mobile#6

Merged

heathkit added a commit to Team488/ScoutingApp that referenced this issue Mar 4, 2019

Got MobX working.

696f7d0

Needed to update the JavaScript Core to do this: mobxjs/mobx-react#498

mobxjs locked as off-topic and limited conversation to collaborators Mar 4, 2019

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Can't find variable: Symbol #498

Can't find variable: Symbol #498

KakarN commented Jun 8, 2018

mweststrate commented Jun 8, 2018

KakarN commented Jun 9, 2018

kennethnym commented Jun 10, 2018 •

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mweststrate commented Jun 11, 2018

sasurau4 commented Jun 11, 2018

mweststrate commented Jun 11, 2018 via email

sasurau4 commented Jun 11, 2018

juanamd commented Jun 14, 2018

mweststrate commented Jun 15, 2018 via email

z0nekill commented Jul 4, 2018

hvaoc commented Jul 18, 2018 •

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tusharmutreja commented Aug 9, 2018

tokinonagare commented Sep 17, 2018

pstanton commented Oct 3, 2018

JeffGuKang commented Oct 23, 2018

zdh commented Nov 16, 2018

shuiRong commented Dec 15, 2018 •

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TyLy83 commented Dec 17, 2018

sanguineman91 commented Jan 8, 2019

lironhl commented Feb 3, 2019

igor90007 commented Mar 4, 2019

mweststrate commented Mar 4, 2019

Can't find variable: Symbol #498

Can't find variable: Symbol #498

Comments

KakarN commented Jun 8, 2018

mweststrate commented Jun 8, 2018

KakarN commented Jun 9, 2018

kennethnym commented Jun 10, 2018 • edited Loading

mweststrate commented Jun 11, 2018

sasurau4 commented Jun 11, 2018

mweststrate commented Jun 11, 2018 via email

sasurau4 commented Jun 11, 2018

juanamd commented Jun 14, 2018

mweststrate commented Jun 15, 2018 via email

z0nekill commented Jul 4, 2018

hvaoc commented Jul 18, 2018 • edited Loading

tusharmutreja commented Aug 9, 2018

tokinonagare commented Sep 17, 2018

pstanton commented Oct 3, 2018

JeffGuKang commented Oct 23, 2018

zdh commented Nov 16, 2018

shuiRong commented Dec 15, 2018 • edited Loading

TyLy83 commented Dec 17, 2018

sanguineman91 commented Jan 8, 2019

lironhl commented Feb 3, 2019

igor90007 commented Mar 4, 2019

mweststrate commented Mar 4, 2019

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hvaoc commented Jul 18, 2018 •

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