Remove duplicate output.

index.js

@@ -1,3 +1,5 @@
+"use strict"
+
 var eslint = require("eslint")
 var assign = require("object-assign")
 var loaderUtils = require("loader-utils")
@@ -8,6 +10,33 @@ var cache = createCache("eslint-loader")
 
 var engines = {}
 
+/**
+ * Class representing an ESLintError.
+ * @extends Error
+ */
+class ESLintError extends Error {
+  /**
+   * Create an ESLintError.
+   * @param {string} messages - Formatted eslint errors.
+   */
+  constructor(messages) {
+    super()
+    this.name = "ESLintError"
+    this.message = messages
+    this.stack = ""
+  }
+
+  /**
+   * Returns a stringified representation of our error. This method is called
+   * when an error is consumed by console methods
+   * ex: console.error(new ESLintError(formattedMessage))
+   * @return {string} error - A stringified representation of the error.
+   */
+  inspect() {
+    return this.message
+  }
+}
+
 /**
  * printLinterOutput
  *
@@ -80,17 +109,18 @@ function printLinterOutput(res, config, webpack) {
       }
 
       if (emitter) {
-        emitter(messages)
         if (config.failOnError && res.errorCount) {
-          throw new Error(
+          throw new ESLintError(
             "Module failed because of a eslint error.\n" + messages
           )
         }
         else if (config.failOnWarning && res.warningCount) {
-          throw new Error(
+          throw new ESLintError(
             "Module failed because of a eslint warning.\n" + messages
           )
         }
+
+        emitter(webpack.version === 2 ? new ESLintError(messages) : messages)
       }
       else {
         throw new Error(

test/formatter-multiple-entries.js

@@ -1,17 +1,12 @@
 var test = require("ava")
 var webpack = require("webpack")
 var conf = require("./utils/conf")
-var webpackWeirdPrefix = require("./utils/weird-prefix.js")
 var fs = require("fs")
+var path = require("path")
 
 test.cb("eslint-loader can be configured to write multiple eslint result files",
 function(t) {
   var outputFilename = "outputReport-[name].txt"
-  var outputFilenamesArr = [
-    "outputReport-error-multi-two.txt",
-    "outputReport-error-multi-one.txt",
-    "outputReport-error-multi.txt",
-  ]
   var config = conf(
     {
       entry: [
@@ -30,31 +25,32 @@ function(t) {
 
   /* Plan for the success count. Failure cases are going to fail anyway so the
    * count being off for those cases doesn't matter. */
-  t.plan(outputFilenamesArr.length * 2)
+  t.plan(config.entry.length * 2)
 
   webpack(config,
   function(err, stats) {
     if (err) {
       throw err
     }
 
-    for (var i = 0; i < outputFilenamesArr.length; i++) {
-      var filename = config.output.path + outputFilenamesArr[i]
+    stats.compilation.errors.forEach(function(error) {
+      var basename = path.basename(error.module.resource, ".js")
+      var filename = config.output.path + "outputReport-" + basename + ".txt"
 
       try {
         var contents = fs.readFileSync(filename, "utf8")
 
         t.pass("File '" + filename + "' has been created")
         t.is(
-          stats.compilation.errors[i].message,
-          webpackWeirdPrefix + contents,
+          error.message,
+          contents,
           "File '" + filename + "' Contents should equal output"
         )
       }
       catch (e) {
         t.fail("Expected file '" + filename + "' to have been created:" + e)
       }
-    }
+    })
 
     t.end()
   })

test/formatter-write.js

@@ -2,7 +2,6 @@
 var test = require("ava")
 var webpack = require("webpack")
 var conf = require("./utils/conf")
-var webpackWeirdPrefix = require("./utils/weird-prefix.js")
 var fs = require("fs")
 
 test.cb("eslint-loader can be configured to write eslint results to a file",
@@ -46,7 +45,7 @@ function(t) {
 
           t.is(
             stats.compilation.errors[0].message,
-            webpackWeirdPrefix + contents,
+            contents,
             "File Contents should equal output"
           )
         }