错误解析JSX

Question

我刚开始用gulp和babel在一起。我创建了一个构建任务(下面的简化版本)：

var gulp = require('gulp');
var babel = require('gulp-babel');

gulp.task('build', () => {
  return gulp.src('src/components/App.jsx')
    .pipe(babel())
    .pipe(gulp.dest('build'))
});

我的文件src/components/App.jsx看起来像：

/** @jsx React.DOM */

import React, {Component} from 'react';

class App extends Component {
  render() {
    return <div>Example</div>
  }
}

export default App;

我得到的错误是：

events.js:141
      throw er; // Unhandled 'error' event
      ^
SyntaxError: /Users/user/src/components/app.jsx: Unexpected token (8:6)
   6 |   render: () => {
   7 |     return (
>  8 |       <div>Test</div>
     |       ^
   9 |     )
  10 |   }
  11 | });
    at Parser.pp.raise (/Users/user/node_modules/gulp-babel/node_modules/babel-core/node_modules/babylon/lib/parser/location.js:24:13)
    at Parser.pp.unexpected (/Users/user/node_modules/gulp-babel/node_modules/babel-core/node_modules/babylon/lib/parser/util.js:91:8)
    at Parser.pp.parseExprAtom (/Users/user/node_modules/gulp-babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:514:12)
    at Parser.pp.parseExprSubscripts (/Users/user/node_modules/gulp-babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:267:19)
    at Parser.pp.parseMaybeUnary (/Users/user/node_modules/gulp-babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:247:19)
    at Parser.pp.parseExprOps (/Users/user/node_modules/gulp-babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:178:19)
    at Parser.pp.parseMaybeConditional (/Users/user/node_modules/gulp-babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:160:19)
    at Parser.pp.parseMaybeAssign (/Users/user/node_modules/gulp-babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:123:19)
    at Parser.pp.parseParenAndDistinguishExpression (/Users/user/node_modules/gulp-babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:566:26)
    at Parser.pp.parseExprAtom (/Users/user/node_modules/gulp-babel/node_modules/babel-core/node_modules/babylon/lib/parser/expression.js:471:19)

我肯定做错了什么，但我不知道是什么。有什么想法吗？

Answer 1

Babel从版本6开始，在默认情况下不会做任何事情，您必须提供一组要应用于源代码的变压器。

在您的示例中，您希望同时设置react和es2015转换器预置：

.pipe(babel({
    presets: ['react', 'es2015']
}))

进一步详情：

• https://babeljs.io/blog/2015/10/29/6.0.0/