javascript - 标识符“_toConsumableArray”已被声明
问题描述
启动我的Redux
应用程序时遇到这样的问题:
./node_modules/draftjs-md-converter/dist/index.js
Syntax error: /Users/vlasenkona/Desktop/gris-seqr2/ui/node_modules/draftjs-md-converter/dist/index.js: Identifier '_toConsumableArray' has already been declared (196:9)
194 | var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
195 |
> 196 | function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
| ^
197 |
198 | var parse = require('@textlint/markdown-to-ast').parse;
199 |
at parser.next (<anonymous>)
启动脚本如下:
'use strict';
// Do this as the first thing so that any code reading it knows the right env.
process.env.BABEL_ENV = 'development';
process.env.NODE_ENV = 'development';
// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on('unhandledRejection', err => {
throw err;
});
// Ensure environment variables are read.
require('../config/env');
const fs = require('fs');
const chalk = require('chalk');
const webpack = require('webpack');
const WebpackDevServer = require('webpack-dev-server');
const clearConsole = require('react-dev-utils/clearConsole');
const {
choosePort,
createCompiler,
prepareProxy,
prepareUrls,
} = require('react-dev-utils/WebpackDevServerUtils');
const openBrowser = require('react-dev-utils/openBrowser');
const paths = require('../config/paths');
const config = require('../config/webpack.config.dev');
const createDevServerConfig = require('../config/webpackDevServer.config');
const useYarn = fs.existsSync(paths.yarnLockFile);
const isInteractive = process.stdout.isTTY;
// Tools like Cloud9 rely on this.
const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
const HOST = process.env.HOST || '0.0.0.0';
// We attempt to use the default port but if it is busy, we offer the user to
// run on a different port. `detect()` Promise resolves to the next free port.
choosePort(HOST, DEFAULT_PORT)
.then(port => {
if (port == null) {
// We have not found a port.
return;
}
const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
const appName = require(paths.appPackageJson).name;
const urls = prepareUrls(protocol, HOST, port);
// Create a webpack compiler that is configured with custom messages.
const compiler = createCompiler(webpack, config, appName, urls, useYarn);
// Load proxy config
const proxySetting = require(paths.appPackageJson).proxy;
const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
// Serve webpack assets generated by the compiler over a web sever.
const serverConfig = createDevServerConfig(
proxyConfig,
urls.lanUrlForConfig
);
const devServer = new WebpackDevServer(compiler, serverConfig);
// Launch WebpackDevServer.
devServer.listen(port, HOST, err => {
if (err) {
return console.log(err);
}
if (isInteractive) {
clearConsole();
}
console.log(chalk.cyan('Starting the development server...\n'));
openBrowser(urls.localUrlForBrowser);
});
['SIGINT', 'SIGTERM'].forEach(function(sig) {
process.on(sig, function() {
devServer.close();
process.exit();
});
});
})
.catch(err => {
if (err && err.message) {
console.log(err.message);
}
process.exit(1);
});
该应用程序的启动工作正常,直到我切换到babel7
,其过程(和相关配置文件)可以在我的另一个线程中找到:
我尝试更新draftjs-md-converter
到最新版本,但没有解决问题。我在这个线程中发现:
可能会发生这样的错误,因为该应用程序以某种方式启动了两次,但不确定为什么它现在开始这样做。
解决方案
可以在这里找到解决方案:
https://github.com/kadikraman/draftjs-md-converter/pull/56
这是因为Babel 7和Draftjs-md-converter都定义了 _toConsumableArray函数。因此,拉取请求是实际 github 页面上的问题,它是用 parcel 构建的,解决方案如下:
git clone https://github.com/kadikraman/draftjs-md-converter.git
cd draftjs-md-converter
git checkout origin/chore/use-parcel-for-bundling
npm i
npm run compile
之后,将dist文件夹中的文件复制到node_modules/draftjs-md-converter/dist/一个解决了这个问题。
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