gulp 无法正常使用babel

Question

已经安装过babel和presets-es2015

package.json中都有相应依赖

{
  "name": "test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-preset-es2015": "^6.24.1",
    "gulp": "^3.9.1",
    "gulp-babel": "^6.1.2"
  }
}

gulpfile.js

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

gulp.task("es5", function() {
    return gulp.src("es5/test.js")
        .pipe(babel({
            presets: ["es2015"]               
        }))
        .pipe(gulp.dest("es6"));
});

目录结构：

运行起来就报错：Error: Couldn't find preset "es2015" relative to directory "C:\Users\Li\Desktop"

用：presets: ['es2015'].map(require.resolve)报：Error: Cannot find module 'es2015'

但是我都安装了呀，package.json里面也都有显示

Answer 1

1. babel-presets-es2015先确认一下有没有安装好。

2. 第二个pipe里面的内容和.babelrc重复了，只需要一个就可以了

Answer 2

试试

npm i babel-core -D