fix(emitErrors): no console output when file(s) are clean (#71)

* tests: add test for lint-free + emitErrors case

and use const for assured block scoping

* fix: use helper functions for results filtering

* fix: remove unneeded lodash.defaultTo dependency

lib/lint-dirty-modules-plugin.js

@@ -1,7 +1,7 @@
 'use strict';
 
 var assign = require('object-assign');
-var defaultTo = require('lodash.defaultto');
+var defaultTo = require('ramda').defaultTo;
 var minimatch = require('minimatch');
 var runCompilation = require('./run-compilation');
 
@@ -67,7 +67,7 @@ LintDirtyModulesPlugin.prototype.getChangedFiles = function getChangedFiles (fil
 };
 
 function hasFileChanged (filename, timestamp) {
-  return defaultTo(this.prevTimestamps[filename], this.startTime) < defaultTo(timestamp, Infinity);
+  return defaultTo(this.startTime)(this.prevTimestamps[filename]) < defaultTo(Infinity)(timestamp);
 }
 
 module.exports = LintDirtyModulesPlugin;

lib/run-compilation.js

@@ -1,6 +1,7 @@
 'use strict';
 
 var chalk = require('chalk');
+var R = require('ramda');
 var linter = require('./linter');
 var errorMessage = require('./constants').errorMessage;
 
@@ -19,13 +20,12 @@ module.exports = function runCompilation (options, compiler, done) {
     .then(function linterSuccess (lint) {
       var results = lint.results;
 
-      warnings = options.emitErrors === false ? results : results.filter(function (file) {
-        return !file.errored && file.warnings && file.warnings.length;
-      });
-
-      errors = options.emitErrors === false ? [] : results.filter(function (file) {
-        return file.errored;
-      });
+      if (options.emitErrors === false) {
+        warnings = results.filter(R.either(fileHasErrors, fileHasWarnings));
+      } else {
+        warnings = results.filter(R.both(R.complement(fileHasErrors), fileHasWarnings));
+        errors = results.filter(fileHasErrors);
+      }
 
       if (options.quiet === false) {
         console.warn(options.formatter(results));
@@ -53,3 +53,11 @@ module.exports = function runCompilation (options, compiler, done) {
     callback();
   });
 };
+
+function fileHasErrors (file) {
+  return file.errored;
+}
+
+function fileHasWarnings (file) {
+  return file.warnings && file.warnings.length;
+}

package.json

@@ -36,9 +36,9 @@
   "dependencies": {
     "arrify": "^1.0.1",
     "chalk": "^1.1.3",
-    "lodash.defaultto": "^4.14.0",
     "minimatch": "^3.0.3",
     "object-assign": "^4.1.0",
+    "ramda": "^0.23.0",
     "stylelint": "^7.7.0"
   },
   "devDependencies": {

test/index.test.js

@@ -1,15 +1,15 @@
 'use strict';
 
-var assign = require('object-assign');
-var td = require('testdouble');
+const assign = require('object-assign');
+const td = require('testdouble');
 
-var StyleLintPlugin = require('../');
+const StyleLintPlugin = require('../');
 
-var pack = require('./helpers/pack');
-var webpack = require('./helpers/webpack');
-var baseConfig = require('./helpers/base-config');
-var configFilePath = getPath('./.stylelintrc');
-var errorMessage = require('../lib/constants').errorMessage;
+const pack = require('./helpers/pack');
+const webpack = require('./helpers/webpack');
+const baseConfig = require('./helpers/base-config');
+const configFilePath = getPath('./.stylelintrc');
+const errorMessage = require('../lib/constants').errorMessage;
 
 describe('stylelint-webpack-plugin', function () {
   it('works with a simple file', function () {
@@ -46,7 +46,7 @@ describe('stylelint-webpack-plugin', function () {
   });
 
   it('fails on errors when asked to', function () {
-    var config = {
+    const config = {
       context: './test/fixtures/single-error',
       plugins: [
         new StyleLintPlugin({
@@ -65,7 +65,7 @@ describe('stylelint-webpack-plugin', function () {
   });
 
   it('fails when .stylelintrc is not a proper format', function () {
-    var config = {
+    const config = {
       context: './test/fixtures/single-error',
       plugins: [
         new StyleLintPlugin({
@@ -92,7 +92,7 @@ describe('stylelint-webpack-plugin', function () {
     });
 
     it('sends messages to the console', function () {
-      var config = {
+      const config = {
         context: './test/fixtures/syntax-error',
         plugins: [
           new StyleLintPlugin({
@@ -111,15 +111,14 @@ describe('stylelint-webpack-plugin', function () {
   });
 
   context('without StyleLintPlugin configuration', function () {
-    var config = {
-      context: './test/fixtures/lint-free',
+    const config = {
       plugins: [
         new StyleLintPlugin()
       ]
     };
 
     it('works by using stylelint#cosmiconfig under the hood', function () {
-      return pack(assign({}, baseConfig, config))
+      return pack(assign({}, baseConfig, config, { context: './test/fixtures/lint-free' }))
         .then(function (stats) {
           expect(stats.compilation.errors).to.have.length(0);
           expect(stats.compilation.warnings).to.have.length(0);
@@ -136,7 +135,7 @@ describe('stylelint-webpack-plugin', function () {
 
   context('interop with NoErrorsPlugin', function () {
     it('works when failOnError is false', function () {
-      var config = {
+      const config = {
         context: './test/fixtures/single-error',
         plugins: [
           new StyleLintPlugin({
@@ -154,8 +153,7 @@ describe('stylelint-webpack-plugin', function () {
     });
 
     context('when failOnError is true', function () {
-      var config = {
-        context: './test/fixtures/single-error',
+      const config = {
         plugins: [
           new StyleLintPlugin({
             configFile: configFilePath,
@@ -167,7 +165,7 @@ describe('stylelint-webpack-plugin', function () {
       };
 
       it('throws when there is an error', function () {
-        return pack(assign({}, baseConfig, config))
+        return pack(assign({}, baseConfig, config, { context: './test/fixtures/single-error' }))
           .then(expect.fail)
           .catch(function (err) {
             expect(err).to.be.instanceof(Error);
@@ -184,19 +182,26 @@ describe('stylelint-webpack-plugin', function () {
   });
 
   context('when `emitErrors` is disabled', function () {
-    it('emits errors as warnings when asked to', function () {
-      var config = {
-        context: './test/fixtures/single-error',
-        plugins: [
-          new StyleLintPlugin({
-            configFile: configFilePath,
-            quiet: true,
-            emitErrors: false
-          })
-        ]
-      };
+    const config = {
+      plugins: [
+        new StyleLintPlugin({
+          configFile: configFilePath,
+          quiet: true,
+          emitErrors: false
+        })
+      ]
+    };
 
-      return pack(assign({}, baseConfig, config))
+    it('does not print warnings or errors when there are none', function () {
+      return pack(assign({}, baseConfig, config, { context: './test/fixtures/lint-free' }))
+        .then(function (stats) {
+          expect(stats.compilation.errors).to.have.length(0);
+          expect(stats.compilation.warnings).to.have.length(0);
+        });
+    });
+
+    it('emits errors as warnings when asked to', function () {
+      return pack(assign({}, baseConfig, config, { context: './test/fixtures/single-error' }))
         .then(function (stats) {
           expect(stats.compilation.errors).to.have.length(0);
           expect(stats.compilation.warnings).to.have.length(1);
@@ -205,18 +210,7 @@ describe('stylelint-webpack-plugin', function () {
     });
 
     it('still indicates that warnings are warnings, even when emitting errors as warnings too', function () {
-      var config = {
-        context: './test/fixtures/rule-warning',
-        plugins: [
-          new StyleLintPlugin({
-            configFile: configFilePath,
-            quiet: true,
-            emitErrors: false
-          })
-        ]
-      };
-
-      return pack(assign({}, baseConfig, config))
+      return pack(assign({}, baseConfig, config, { context: './test/fixtures/rule-warning' }))
         .then(function (stats) {
           expect(stats.compilation.errors).to.have.length(0);
           expect(stats.compilation.warnings).to.have.length(1);
@@ -227,7 +221,7 @@ describe('stylelint-webpack-plugin', function () {
 
   context('lintDirtyModulesOnly flag is enabled', function () {
     it('skips linting on initial run', function () {
-      var config = {
+      const config = {
         context: './test/fixtures/single-error',
         plugins: [
           new StyleLintPlugin({
@@ -246,7 +240,7 @@ describe('stylelint-webpack-plugin', function () {
     });
 
     it('still skips on initial run with `emitErrors` disabled', function () {
-      var config = {
+      const config = {
         context: './test/fixtures/single-error',
         plugins: [
           new StyleLintPlugin({