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This repository was archived by the owner on May 29, 2019. It is now read-only.
This repository was archived by the owner on May 29, 2019. It is now read-only.

Unexpected: "ERROR in <blah> doesn't export content" #42

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@roblg

Description

@roblg

When running ./node_modules/webpack/bin/webpack.js --watch, an error shows up in the terminal after changing a CSS file ("ERROR in doesn't export content"), and the webpack compilation seems to run twice.

The high-level setup is as follows: two entry points, one (OneEntry.js) does a synchronous require of Dep.js, and the other (TwoEntry.js) does a require.ensure of Dep.js. Dep.js requires Dep.css. Changing Dep.css while running with --watch triggers the error message.

The final output doesn't seem to be affected (at least in my simple example here), but it's still a scary message. I started to step through it with node-debug, but didn't get much farther than figuring out where the error was coming from -- line 156 of extract-text-webpack-plugin/index.js. I'll probably look at it at little further tomorrow.

My webpack.config.js:

var ExtractTextPlugin = require("extract-text-webpack-plugin");

module.exports = {
    target: "web",
    debug: true,
    // devtool: "source-map",
    entry: {
        One: './OneEntry.js',
        Two: './TwoEntry.js'
    },
    output: {
        path: "./target",
        filename: "[name].bundle.js"
    },
    module: {
        loaders: [            
            { test: /\.css$/, loader: ExtractTextPlugin.extract("style-loader", "css-loader") },
        ]
    },
    plugins: [
        new ExtractTextPlugin("[name].styles.css")
    ]
};

OneEntry.js

require('./Dep.js');

module.exports = function () {
    console.log("OneEntry");
}

TwoEntry.js

module.exports = function () {
    require.ensure([], function (require) {
        var One = require('./Dep.js');
    });
}

Dep.js

require('./Dep.css');

module.exports = function helloWorld() {
    console.log("Hello, World!");
}

Dep.css

body {
    font-weight: normal;
}

Console output:

[10:30:58] extract-text-plugin-bug-repro$ ./node_modules/webpack/bin/webpack.js --watch
Hash: 1af67a17d8cdba702d4f
Version: webpack 1.4.13
Time: 123ms
         Asset  Size  Chunks             Chunk Names
 Two.bundle.js  3850       0  [emitted]  Two
 1.1.bundle.js   332       1  [emitted]
 One.bundle.js  1886    2, 1  [emitted]  One
One.styles.css    32    2, 1  [emitted]  One
   [0] ./OneEntry.js 81 {2} [built]
   [0] ./TwoEntry.js 113 {0} [built]
   [1] ./Dep.js 103 {1} {2} [built]
    + 4 hidden modules
Child extract-text-webpack-plugin:
        + 2 hidden modules
Hash: 33291634f4065e501d4e
Version: webpack 1.4.13
Time: 24ms
         Asset  Size  Chunks             Chunk Names
 1.1.bundle.js   332       1  [emitted]
 One.bundle.js  1886    2, 1  [emitted]  One
One.styles.css    30    2, 1  [emitted]  One
    + 7 hidden modules
Child extract-text-webpack-plugin:
        + 2 hidden modules
Hash: 2ed4f9458139cfb59089
Version: webpack 1.4.13
Time: 8ms
         Asset  Size  Chunks             Chunk Names
 1.1.bundle.js  1253       1  [emitted]
 One.bundle.js  2807    2, 1  [emitted]  One
One.styles.css    30    2, 1  [emitted]  One
    + 7 hidden modules

ERROR in /path/extract-text-plugin-bug-repro/node_modules/extract-text-webpack-plugin/loader.js?{"omit":1,"extract":true,"remove":true}!/path/extract-text-plugin-bug-repro/node_modules/style-loader/index.js!/path/extract-text-plugin-bug-repro/node_modules/css-loader/index.js!/path/extract-text-plugin-bug-repro/Dep.css doesn't export content

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