Error: Received a non-Vinyl object in dest()

[ThePeach]

Hello I've stumbled this error and have no idea what's wrong.

I'm using the following versions of npm and node:

$ npm --version && node --version
5.5.1
v8.9.3

I'm also using the latest version of metalsmith (2.3.0) and of metalsmith-tags (2.0.0) with gulp 4.
Here's the list of deps from package.json:

  "devDependencies": {
    "@babel/core": "^7.0.0-beta.32",
    "@babel/preset-env": "^7.0.0-beta.32",
    "@buildit/gravy": "^1.3.0",
    "babel-core": "^6.26.0",
    "babel-plugin-transform-es2015-modules-umd": "^6.24.1",
    "babel-preset-env": "^1.6.1",
    "breakpoint-sass": "^2.7.1",
    "browser-sync": "^2.18.13",
    "del": "^3.0.0",
    "eslint": "^4.3.0",
    "eslint-config-standard": "^10.2.1",
    "eslint-plugin-import": "^2.7.0",
    "eslint-plugin-node": "^5.1.1",
    "eslint-plugin-promise": "^3.5.0",
    "eslint-plugin-standard": "^3.0.1",
    "eyeglass": "^1.2.1",
    "gulp": "github:gulpjs/gulp#4.0",
    "gulp-autoprefixer": "^4.0.0",
    "gulp-babel": "^7.0.0",
    "gulp-clean-css": "^3.7.0",
    "gulp-concat": "^2.6.1",
    "gulp-filter": "^5.0.0",
    "gulp-front-matter": "^1.3.0",
    "gulp-if": "^2.0.2",
    "gulp-imagemin": "^3.3.0",
    "gulp-rename": "^1.2.2",
    "gulp-replace": "^0.6.1",
    "gulp-sass": "^3.1.0",
    "gulp-size": "^2.1.0",
    "gulp-sourcemaps": "^2.6.0",
    "gulp-uglify": "^3.0.0",
    "gulpsmith": "^0.5.5",
    "handlebars": "^4.0.10",
    "helper-moment": "^0.2.0",
    "imagemin-jpeg-recompress": "^5.1.0",
    "imagemin-pngquant": "^5.0.1",
    "metalsmith": "^2.3.0",
    "metalsmith-assets": "^0.1.0",
    "metalsmith-collections": "^0.9.0",
    "metalsmith-debug": "^1.1.0",
    "metalsmith-html-minifier": "^2.2.0",
    "metalsmith-layouts": "^1.8.1",
    "metalsmith-mapsite": "^1.0.4",
    "metalsmith-markdown": "^0.2.1",
    "metalsmith-md-summary": "0.0.1",
    "metalsmith-metallic": "^2.0.2",
    "metalsmith-permalinks": "^0.5.0",
    "metalsmith-serve": "0.0.7",
    "metalsmith-tags": "^2.0.0",
    "metalsmith-watch": "^1.0.3",
    "stylelint-config-sass-guidelines": "^3.0.1",
    "stylelint-order": "^0.6.0",
    "stylelint-scss": "^1.5.1",
    "susy": "^3.0.0",
    "swag": "^0.7.0",
    "yargs": "^8.0.2"
  },

the pipeline for metalsmith is more or less the following (reduced to the minimum where the error is still reproducible, i.e. if I disable tags and add anything else, it works fine).

function metalsmith () {
  return gulp.src(paths.pages.src)
    .pipe(fmFilter)
    .pipe(frontMatter({
      property: 'frontMatter'
    })).on('data', function (file) {
      assign(file, file.frontMatter);
      delete file.frontMatter;
    })
    .pipe(fmFilter.restore)
    .pipe(
      gulpsmith()
        .use(tags({
          'handle': 'tags',
          'path': 'tags/:tag/index.html',
          'layout': 'posts-list.hbs',
          'sortBy': 'published',
          'reverse': true,
          'skipMetadata': false,
          'slug': { 'mode': 'rfc3986' },
          'hyphenate': true
        }))        .use(debug())
    )
    .pipe(gulpIf(PRODUCTION, replace('.css', '.min.css')))
    .pipe(gulp.dest(paths.pages.dest))
    .pipe(browserSync.reload({ stream: true }));
}

the error I'm getting is the following:

[14:10:15] 'metalsmith' errored after 1.02 s
[14:10:15] Error: Received a non-Vinyl object in `dest()`
    at DestroyableTransform.normalize [as _transform] (/Users/peach/repos/blog.smartart.it-static/node_modules/vinyl-fs/lib/dest/prepare.js:16:17)
    at DestroyableTransform.Transform._read (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_transform.js:182:10)
    at DestroyableTransform.Transform._write (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_transform.js:170:83)
    at doWrite (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_writable.js:406:64)
    at writeOrBuffer (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_writable.js:395:5)
    at DestroyableTransform.Writable.write (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_writable.js:322:11)
    at Pumpify.Duplexify._write (/Users/peach/repos/blog.smartart.it-static/node_modules/duplexify/index.js:201:22)
    at doWrite (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_writable.js:406:64)
    at writeOrBuffer (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_writable.js:395:5)
    at Pumpify.Writable.write (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_writable.js:322:11)
    at DestroyableTransform.ondata (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_readable.js:612:20)
    at emitOne (events.js:116:13)
    at DestroyableTransform.emit (events.js:211:7)
    at addChunk (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_readable.js:284:12)
    at readableAddChunk (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_readable.js:271:11)
    at DestroyableTransform.Readable.push (/Users/peach/repos/blog.smartart.it-static/node_modules/readable-stream/lib/_stream_readable.js:238:10)

any help would be greatly appreciated

[ThePeach]

thanks to Woody on the metalsmith slack channel, I managed to narrow down the culprit of this mess, and it seems it's down to the latest version of Gulp since they upgraded their dependency of vinyl-fs to v3 gulpjs/gulp@c1ba80c#diff-b9cfc7f2cdf78a7f4b91a753d10865a2

Regardless, this means that metalsmith-tags and possibly metalsmith-mapsite are going to have problems going forward.

[ThePeach]

this has been solved with the release of gulpsmith 0.6.0.