PostCSS 错误：[object Object] 不是 PostCSS 插件

错误来自于postcss插件，我想我可能写错了。

我正在尝试添加cssnano and autoprefixer to the postcss plugin.

gulp/node_modules/gulp-postcss/node_modules/postcss/lib/processor.js:143
        throw new Error(i + ' is not a PostCSS plugin');
        ^

Error: [object Object] is not a PostCSS plugin
    at Processor.normalize (/Applications/XAMPP/xamppfiles/htdocs/sites/gulp/node_modules/gulp-postcss/node_modules/postcss/lib/processor.js:143:15)
    at new Processor (/Applications/XAMPP/xamppfiles/htdocs/sites/gulp/node_modules/gulp-postcss/node_modules/postcss/lib/processor.js:51:25)
    at postcss (/Applications/XAMPP/xamppfiles/htdocs/sites/gulp/node_modules/gulp-postcss/node_modules/postcss/lib/postcss.js:73:10)
    at Transform.stream._transform (/Applications/XAMPP/xamppfiles/htdocs/sites/gulp/node_modules/gulp-postcss/index.js:47:5)
    at Transform._read (_stream_transform.js:167:10)
    at Transform._write (_stream_transform.js:155:12)
    at doWrite (_stream_writable.js:300:12)
    at writeOrBuffer (_stream_writable.js:286:5)
    at Transform.Writable.write (_stream_writable.js:214:11)
    at DestroyableTransform.ondata (/Applications/XAMPP/xamppfiles/htdocs/sites/gulp/node_modules/gulp-sass/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:531:20)
Mac-a45e60e72dad:gulp JoeKonst$ 

My code:

// Dependancies
var gulp = require('gulp'),
    browserSync = require('browser-sync'),
    plumber = require('gulp-plumber'),
    autoprefixer = require('gulp-autoprefixer'),
    uglify = require('gulp-uglify'),
    compass = require('gulp-compass'),
    rename = require('gulp-rename'),
    nano = require('cssnano'),
    del = require('del'),
    postcss = require('gulp-postcss'),
    sass = require('gulp-sass');

// Styles
gulp.task('styles', function(){
    gulp.src('sass/main.scss')
    .pipe(sass())
    .pipe(postcss([autoprefixer({browsers: ['last 2 versions']}), nano()]))
    .pipe(gulp.dest('css/'));

    gulp.watch('sass/**/*.scss', ['styles']);
});

// Tasks
gulp.task('default', ['styles']);

@rizkit - 我找到了fix https://github.com/postcss/autoprefixer/issues/1358#issuecomment-693175534这很简单。赶紧跑npm i -d postcss问题就解决了。

基本上，你两者都需要gulp-postcss and postcss依赖项中的插件才能正常工作。我假设gulp-postcss插件需要更新postcss项目中的包引用可以正确修复它，所以我们只需要包含gulp-postcss将来。