Ionic 参考错误:全局不是使用web3定义的

deikduxw  于 2022-12-16  发布在  Ionic
关注(0)|答案(3)|浏览(150)

我一直在尝试将Web 3安装到我的Ionic v4项目中。当我为项目提供服务时,它一直抛出错误。我收到一个错误,指出引用错误:未定义全局。
1.开始新的Ionic项目
1.安装web 3:npm安装--保存web 3
1.安装节点类型:npm安装--保存设备@类型/节点
1.编辑一些代码来访问web 3:

import { Component } from '@angular/core';
import { Web3 } from 'web3'; 

@Component({
  selector: 'app-home',
  templateUrl: 'home.page.html',
  styleUrls: ['home.page.scss'],
})
export class HomePage {

  web3 = new Web3(new Web3.providers.HttpProvider('https://rinkeby.infura.io/v3/apikey...'));

  constructor() {}

  test(){
    console.log(this.web3);
  }
}

1.运行离子服务器
1.编译成功,但我在谷歌浏览器的控制台像这样的错误

core.js:9110 ERROR Error: Uncaught (in promise): ReferenceError: global is not defined
ReferenceError: global is not defined
    at Object../node_modules/stream-http/lib/capability.js (capability.js:1)
    at __webpack_require__ (bootstrap:84)
    at Object../node_modules/stream-http/lib/request.js (request.js:1)
    at __webpack_require__ (bootstrap:84)
    at Object../node_modules/stream-http/index.js (index.js:1)
    at __webpack_require__ (bootstrap:84)
    at Object../node_modules/xhr2-cookies/dist/xml-http-request.js (xml-http-request.js:21)
    at __webpack_require__ (bootstrap:84)
    at Object../node_modules/xhr2-cookies/dist/index.js (index.js:6)
    at __webpack_require__ (bootstrap:84)
    at resolvePromise (zone-evergreen.js:797)
    at resolvePromise (zone-evergreen.js:754)
    at zone-evergreen.js:858
    at ZoneDelegate.invokeTask (zone-evergreen.js:391)
    at Object.onInvokeTask (core.js:34182)
    at ZoneDelegate.invokeTask (zone-evergreen.js:390)
    at Zone.runTask (zone-evergreen.js:168)
    at drainMicroTaskQueue (zone-evergreen.js:559)

package.json

{
  "name": "my-app",
  "version": "0.0.1",
  "author": "Ionic Framework",
  "homepage": "https://ionicframework.com/",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/common": "~8.1.2",
    "@angular/compiler": "~8.1.2",
    "@angular/core": "~8.1.2",
    "@angular/forms": "~8.1.2",
    "@angular/platform-browser": "~8.1.2",
    "@angular/platform-browser-dynamic": "~8.1.2",
    "@angular/router": "~8.1.2",
    "@ionic-native/core": "^5.0.0",
    "@ionic-native/splash-screen": "^5.0.0",
    "@ionic-native/status-bar": "^5.0.0",
    "@ionic/angular": "^4.7.1",
    "core-js": "^2.5.4",
    "rxjs": "~6.5.1",
    "tslib": "^1.9.0",
    "web3": "^1.2.0",
    "zone.js": "~0.9.1"
  },
  "devDependencies": {
    "@angular-devkit/architect": "~0.801.2",
    "@angular-devkit/build-angular": "~0.801.2",
    "@angular-devkit/core": "~8.1.2",
    "@angular-devkit/schematics": "~8.1.2",
    "@angular/cli": "~8.1.2",
    "@angular/compiler": "~8.1.2",
    "@angular/compiler-cli": "~8.1.2",
    "@angular/language-service": "~8.1.2",
    "@ionic/angular-toolkit": "~2.0.0",
    "@types/jasmine": "~3.3.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "^8.9.5",
    "codelyzer": "^5.0.0",
    "jasmine-core": "~3.4.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.1.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.15.0",
    "typescript": "~3.4.3"
  },
  "description": "An Ionic project"
}

我在这里找到了一个建议https://github.com/ethereum/web3.js/issues/2260#issuecomment-458519127。我遵循了每一步,但我也得到了同样的错误。
如何将web 3导入到Ionic项目中?

izj3ouym

izj3ouym1#

我在WalletConnect上遇到了这个问题。这是我最终得到的解决方案:
我只是导入钱包连接通过:

import WalletConnectProvider from '@walletconnect/web3-provider/dist/umd/index.min.js';

为了让这些类型正常工作,我创建了一个d.ts文件:

declare module '@walletconnect/web3-provider/dist/umd/index.min.js' {
  import WalletConnectProvider from '@walletconnect/web3-provider/dist/esm/index';
  export default WalletConnectProvider
}
niknxzdl

niknxzdl2#

不确定离子有自己的polyfill,但你可以添加到您的polyfill

(window as any).global = window;
if (global === undefined) {
   var global = window;
}
2skhul33

2skhul333#

如果再出现一个错误Uncatch ReferenceError:进程未定义,则添加process.env

export default defineConfig({
  ...
  ...

  define: {
    global: {},
    'process.env': {}
  },
})

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