如何使用Gulp输出小型化和非小型化版本

Question

当我试图在一个任务中获得两个输出时，我得到了这个错误

我想要一个index.js在dist/，index.min.js在同一个文件夹中。

gulp.task('clean', (cb) =>
  del('dist/', cb)
);

gulp.task('scripts', ['clean'], () =>
  gulp.src('src/**.js')
    .pipe($.sourcemaps.init())
    .pipe($.babel())
    .pipe($.sourcemaps.write())
    .pipe(gulp.dest('dist/'))
    .pipe($.uglify({preserveComments: 'some'}))
    .pipe($.rename({ extname: '.min.js' }))
    .pipe($.size({title: 'scripts'}))
    .pipe($.sourcemaps.write('.'))
    .pipe(gulp.dest('dist/'))
);

这是一个错误：

[19:48:55] Requiring external module babel-core/register
[19:49:00] Using gulpfile ~/projects/ar-string/gulpfile.babel.js
[19:49:00] Starting 'clean'...
[19:49:00] Finished 'clean' after 19 ms
[19:49:00] Starting 'scripts'...

events.js:85
      throw er; // Unhandled 'error' event
        ^
Error
at new JS_Parse_Error (eval at <anonymous> (/home/mohamed/projects/ar-string/node_modules/gulp-uglify/node_modules/uglify-js/tools/node.js:24:4), <anonymous>:1508:18)
at js_error (eval at <anonymous> (/home/mohamed/projects/ar-string/node_modules/gulp-uglify/node_modules/uglify-js/tools/node.js:24:4), <anonymous>:1516:11)
at croak (eval at <anonymous> (/home/mohamed/projects/ar-string/node_modules/gulp-uglify/node_modules/uglify-js/tools/node.js:24:4), <anonymous>:2008:9)
at token_error (eval at <anonymous> (/home/mohamed/projects/ar-string/node_modules/gulp-uglify/node_modules/uglify-js/tools/node.js:24:4), <anonymous>:2016:9)
at unexpected (eval at <anonymous> (/home/mohamed/projects/ar-string/node_modules/gulp-uglify/node_modules/uglify-js/tools/node.js:24:4), <anonymous>:2022:9)
at semicolon (eval at <anonymous> (/home/mohamed/projects/ar-string/node_modules/gulp-uglify/node_modules/uglify-js/tools/node.js:24:4), <anonymous>:2042:43)
at simple_statement (eval at <anonymous> (/home/mohamed/projects/ar-string/node_modules/gulp-uglify/node_modules/uglify-js/tools/node.js:24:4), <anonymous>:2222:73)
at eval (eval at <anonymous> (/home/mohamed/projects/ar-string/node_modules/gulp-uglify/node_modules/uglify-js/tools/node.js:24:4), <anonymous>:2095:19)
at eval (eval at <anonymous> (/home/mohamed/projects/ar-string/node_modules/gulp-uglify/node_modules/uglify-js/tools/node.js:24:4), <anonymous>:2055:24)
at block_ (eval at <anonymous> (/home/mohamed/projects/ar-string/node_modules/gulp-uglify/node_modules/uglify-js/tools/node.js:24:4), <anonymous>:2335:20)

注:我认为错误在babel中。

Answer 1

对不起，问题在.babelrc文件中

在此之前：

{
  "presets": ["es2015"],
  "only": "gulpfile.babel.js",
  "retainLines": true
}

之后：

{
  "presets": ["es2015"],
  "retainLines": true
}