“babel plugin react intl”没有按预期工作

create-react-app 命令。现在我想用印地语和英语提供我的网站。 yahoo/react-intl . 我还安装了babel插件react intl插件。还添加了.babelrc文件。

我的 .babelrc

{
"presets": ["es2015", "react"],
"plugins": [
  [
    "react-intl",
    {
      "messagesDir": "./build/messages/"
    }
  ]
]
}

但是我没有从js文件中提取消息到 ./build/messages/

我不知道我在哪里犯了错误。

我的index.js是:

import React from "react";
import ReactDOM from "react-dom";
import { IntlProvider, addLocaleData } from "react-intl";
import hi from "react-intl/locale-data/hi";
import en from "react-intl/locale-data/en";

import registerServiceWorker from "./registerServiceWorker";
import Hello from "./components/Hello";

addLocaleData([...en, ...hi]);

ReactDOM.render(
  <IntlProvider locale="hi" messages={/*comming soon*/}>
    <Hello />
  </IntlProvider>,
  document.getElementById("root")
);
registerServiceWorker();

我的敌人 Hello.js

import React, { Component } from "react";
import { FormattedMessage } from "react-intl";

class Hello extends Component {
  render() {
    return (
      <div>
        <h1>
          <FormattedMessage id="Hello.heading" defaultMessage="Hello world" />
        </h1>
        <p>
          <FormattedMessage
            id="Hello.paragraph"
            defaultMessage="This is my world"
          />
        </p>
      </div>
    );
  }
}

export default Hello;

我的 package.json

{
"name": "i18n-myexamplae",
"version": "0.1.0",
"private": true,
"dependencies": {
  "react": "^16.4.2",
  "react-dom": "^16.4.2",
  "react-intl": "^2.4.0",
  "react-scripts": "1.1.4"
},
"scripts": {
  "start": "react-scripts start",
  "build": "react-scripts build",
  "test": "react-scripts test --env=jsdom",
  "eject": "react-scripts eject"
},
"devDependencies": {
  "babel-plugin-react-intl": "^2.4.0"
}
}