gulp-imagemin：无法加载默认插件 xxx

Question

环境：

• Windows 7的
• 节点 6.9.5

我使用这样的插件npm。但我收到一个错误。从一些视频来看，这是正确的。它与imagemin的版本有关吗？

// gulpfile.js

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

var app = {
  srcPath: 'src/',
  devPath: 'build/',
  prdPath: 'dist/', //????
}
gulp.task('image', function() {
  gulp.src(app.srcPath + 'image/**/*')
  .pipe(gulp.dest(app.devPath + 'image'))
  .pipe(imagemin())
  .pipe(gulp.dest(app.prdPath + 'image'))
})

当我“吞咽图像”时，出现错误：

[13:05:56] Using gulpfile ~\Desktop\study\angularapp\gulpfile.js
[13:05:56] Starting 'image'...
[13:05:56] Finished 'image' after 6.96 ms
[13:05:56] gulp-imagemin: Couldn't load default plugin "gifsicle"
[13:05:56] gulp-imagemin: Couldn't load default plugin "jpegtran"
[13:05:56] gulp-imagemin: Couldn't load default plugin "optipng"
[13:05:56] gulp-imagemin: Minified 1 image (saved 0 B - 0%)

我用过npm install imagemin-optipng，但还是不行。像这样的依赖项：

"devDependencies": {
"clean-css": "^4.0.5",
"gulp": "^3.9.1",
"gulp-clean": "^0.3.2",
"gulp-concat": "^2.6.1",
"gulp-connect": "^5.0.0",
"gulp-cssmin": "^0.1.7",
"gulp-imagemin": "^3.1.1",
"gulp-less": "^3.3.0",
"gulp-load-plugins": "^1.5.0",
"gulp-uglify": "^2.0.1",
"lodash": "^4.17.4",
"open": "^0.0.5"

}

它怎么了？

Answer 1

我有同样的问题，我发现这是因为默认插件没有正确安装。

npm install imagemin-jpegtran imagemin-svgo imagemin-gifsicle imagemin-optipng --save

此警告是由这些行代码#L12引发的

const loadPlugin = (plugin, args) => {
  try {
    return require(`imagemin-${plugin}`).apply(null, args);
  } catch (err) {
    gutil.log(`gulp-imagemin: Couldn't load default plugin "${plugin}"`);
  }
};

如果在catch中记录错误，我们可以看到Module not found xxx。

try {
  return require(`imagemin-${plugin}`).apply(null, args);
} catch (err) {
  console.log(err); // and will throw error: XX Module Not Found
  gutil.log(`gulp-imagemin: Couldn't load default plugin "${plugin}"`);
}

所以我们可以安装丢失的包。

如果还有一些错误，只需重新安装 imagemin

npm uninstall gulp-imagemin --save
npm install gulp-imagemin --save