React Native with Expo:如何使用.env.local配置文件?

相反,您可以使用Expo“extra”配置属性。在app.json中的expo add下,让我们说myApiKey如下:

{
  "expo": {
    "name": "login-app",
    "slug": "login-app",
    "privacy": "public",
    "sdkVersion": "32.0.0",
    "platforms": [
      "ios",
      "android"
    ],
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/icon.png",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "supportsTablet": true
    },
    "extra": {
      "myApiKey" : "1234"
    }
  }
}

你可以在应用程序的任何地方使用它,而无需导入任何文件。就这样用吧:

Expo.Constants.manifest.extra.myApiKey

添加一个env.js文件:

import Constants from "expo-constants";

function getEnvVars() {
  if (__DEV__) {
    return returnEnvVars();
  } else {
      return new Promise(resolve => {
          resolve(Constants.manifest.extra);
      });
  }
}

async function returnEnvVars() {
  return await import("envLocal.js");
}

export default getEnvVars;

然后可以将env变量放入文件中 envLocal.js 这样地: 测试:“localhost”

以及你的产品变量 app.json 文件,如下所示:

{
  "expo": {
    "extra": {
      "test": "prod"
   }
}

最后你可以这样称呼它:

import getEnvVars from "../environment";
getEnvVars().then(vars => console.log(vars));