react-native mobx android realease报错解决方案

rn使用mobx时，debug模式没有任何问题，但是release时发现ios和android都会出现闪退现象。ios比较好弄，android费了一天功夫查阅各种资料最终解决了。下面把解决过程分享一下。

环境

"react": "16.4.1",

"react-native": "0.56.0",

"mobx": "^5.9.4",

"mobx-react": "5.2.0"

pckage.json

"devDependencies": {

    "@babel/core": "7.0.0-beta.47",

    "@babel/plugin-proposal-decorators": "7.0.0-beta.47",

    "@babel/plugin-transform-runtime": "7.0.0-beta.47",

    "@babel/runtime": "7.0.0-beta.47",

    "babel-jest": "24.1.0",

    "babel-preset-mobx": "^2.0.0",

    "babel-preset-react-native": "^5",

    "jest": "24.1.0",

    "metro-react-native-babel-preset": "^0.53.1",

    "react-test-renderer": "16.4.1"

  },

.babelrc

{

  "presets": ["react-native"],

  "plugins": [

        [ "@babel/plugin-proposal-decorators", {"legacy": true}],

        [ "@babel/plugin-transform-runtime",

        {

        "helpers": true,

        "polyfill": false,

        "regenerator": false

         }

    ]

]

}

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1.ios闪退解决方案

将你的index.js文件挪动到下一级文件夹，比如我的是src

外层index.js像下面这样

import { AppRegistry } from 'react-native';

import applyDecoratedDescriptor from '@babel/runtime/helpers/es6/applyDecoratedDescriptor';

import initializerDefineProperty from '@babel/runtime/helpers/es6/initializerDefineProperty';

Object.assign(babelHelpers, {

  applyDecoratedDescriptor,

  initializerDefineProperty

});

import App from './src';

AppRegistry.registerComponent('rn', () => App);

---

2.android闪退解决方案

android-studio下debug发现报错

Can not finde Symbol

Module AppRegistry is not a registered callable module

如果遇到这种错误，大多因为mobx的版本太高，android本身jscore不支持高版本的mobx，有两种解决方案，看mobx作者给的方案，https://github.com/mobxjs/mobx/issues/1582#issuecomment-416131218

我采用的是第一种方案，升级android 的jsc，具体过程参照https://fir.im/uxn7?release_id=5c3ea122ca87a81d10588db8，不过值得一提的是，packge.json里的jsc-android的版本必须与

build.gradle里的一致。注意

packge.json

"dependencies": {

.....省略

    "axios": "^0.18.0",

    "git": "^0.1.5",

    "jsc-android": "^236355.1.1",

.....省略

}

configurations.all {resolutionStrategy {force 'org.webkit:android-jsc:r236355'}}