Unhandled rejection Error: Invalid arguments

[Kamilius]

I'm getting this error while trying to force webpack dev server to write files it serves for webpack itself. Most of files are successfuly "written" into a "dest" directory. But it fails at some point with following stack trace, which actually doesn't help to understand a problem:

[11:57:28] [write-file-webpack-plugin] asset: ./main-9c5ec44d5dd566b19756.js; destination: ./dist/main-9c5ec44d5dd566b19756.js [written] (6.39 MB)
[11:57:28] [write-file-webpack-plugin] asset: ./main-9c5ec44d5dd566b19756.css; destination: ./dist/main-9c5ec44d5dd566b19756.css [written] (479.77 KB)
[11:57:28] [write-file-webpack-plugin] asset: ./main-9c5ec44d5dd566b19756.js.map; destination: ./dist/main-9c5ec44d5dd566b19756.js.map [written] (7.64 MB)
[11:57:28] [write-file-webpack-plugin] asset: ./main-9c5ec44d5dd566b19756.css.map; destination: ./dist/main-9c5ec44d5dd566b19756.css.map [written] (106 B)
Unhandled rejection Error: Invalid arguments
    at filesize (/Users/example/project/node_modules/filesize/lib/filesize.js:50:10)
    at /Users/example/project/node_modules/write-file-webpack-plugin/dist/index.js:192:128
    at /Users/example/project/node_modules/write-file-webpack-plugin/node_modules/lodash/_createBaseFor.js:17:11
    at baseForOwn (/Users/example/project/node_modules/write-file-webpack-plugin/node_modules/lodash/_baseForOwn.js:13:20)
    at /Users/example/project/node_modules/write-file-webpack-plugin/node_modules/lodash/_createBaseEach.js:17:14
    at forEach (/Users/example/project/node_modules/write-file-webpack-plugin/node_modules/lodash/forEach.js:38:10)
    at Compiler.<anonymous> (/Users/example/project/node_modules/write-file-webpack-plugin/dist/index.js:166:35)
    at Compiler.applyPlugins (/Users/example/project/node_modules/tapable/lib/Tapable.js:26:37)
    at Watching._done (/Users/example/project/node_modules/webpack/lib/Compiler.js:78:17)
    at Watching.<anonymous> (/Users/example/project/node_modules/webpack/lib/Compiler.js:61:18)
    at Compiler.emitRecords (/Users/example/project/node_modules/webpack/lib/Compiler.js:282:37)
    at Watching.<anonymous> (/Users/example/project/node_modules/webpack/lib/Compiler.js:58:19)
    at /Users/example/project/node_modules/webpack/lib/Compiler.js:275:11
    at Compiler.applyPluginsAsync (/Users/example/project/node_modules/tapable/lib/Tapable.js:60:69)
    at Compiler.afterEmit (/Users/example/project/node_modules/webpack/lib/Compiler.js:272:8)
    at Compiler.<anonymous> (/Users/example/project/node_modules/webpack/lib/Compiler.js:267:14)
    at /Users/example/project/node_modules/async/lib/async.js:52:16
    at Object.async.forEachOf.async.eachOf (/Users/example/project/node_modules/async/lib/async.js:236:30)
    at Object.async.forEach.async.each (/Users/example/project/node_modules/async/lib/async.js:209:22)
    at Compiler.emitFiles (/Users/example/project/node_modules/webpack/lib/Compiler.js:235:20)
    at MemoryFileSystem.(anonymous function) [as mkdirp] (/Users/example/project/node_modules/webpack-dev-middleware/node_modules/memory-fs/lib/MemoryFileSystem.js:283:10)
    at Compiler.<anonymous> (/Users/example/project/node_modules/webpack/lib/Compiler.js:229:25)

Settings are all corresponding to a guide provided in README.md. devServer has an outputPath which equals to webpack.output.path.

Any thoughts?

[Kamilius]

At some point not a size of file, but a whole object is passed into "filesize" method, which fails a build. To fix that, a check what actually should be provided - parameter, or it's possible property "size", needs to be implemented.

[dfjones1981]

I had this error also, it failed when trying to process my favicon.png file:
new HtmlWebpackPlugin({ template: './src/index.html', inject: 'body', favicon: './src/favicon.png' }),

maybe that's a way to reproduce the error?

[gajus]

At some point not a size of file, but a whole object is passed into "filesize" method, which fails a build.

Can you build a test case for this?

[Kamilius]

@gajus I'll try if will have some spare time. Also need to remember what actually I've wanted to achieve back then (May 30).

Could you point me towards contribution manual? What are you using for unit-testing? (or testing in general)

[gajus]

Could you point me towards contribution manual? What are you using for unit-testing? (or testing in general)

Woah. A project without unit tests. How did that happen. Must have been in a rush. :-)

Looks like you have a free reign.