fix: Windows separator issue

Replacing all Windows' "\" separator to "/" to avoid throwing errors on successful tests

Author: adriantoine

src/index.js

@@ -1,5 +1,5 @@
 
-import { join, resolve, relative, isAbsolute, dirname, basename } from 'path';
+import { join, resolve, relative, isAbsolute, dirname, basename, sep } from 'path';
 import fs from 'fs';
 import { StringLiteral } from 'babel-types';
 import template from 'lodash.template';
@@ -161,7 +161,7 @@ export default function({ types: t }) {
                             if(!isAbsolute(aliasTo)) {
                                 aliasTo = join(process.cwd(), aliasTo);
                             }
-                            let relativeFilePath = relative(dirname(filename), aliasTo).replace(/\\/g, '/');
+                            let relativeFilePath = relative(dirname(filename), aliasTo).split(sep).join('/');
 
                             // In case the file path is the root of the alias, need to put a dot to avoid having an absolute path
                             if(relativeFilePath.length === 0) {

test/index.spec.js

@@ -96,7 +96,7 @@ test('works with libraries targeted with path.resolve', t => {
 test('should throw an error when there is no resolve config', t => {
     t.throws(
         () => transformFixture('basic/absolute.js', {config: 'no-resolve.config.js'}),
-        `${path.resolve(__dirname, 'fixtures/basic/absolute.js')}: The resolved config file doesn\'t contain a resolve configuration`
+        `${path.resolve(__dirname, 'fixtures/basic/absolute.js').split(path.sep).join('/')}: The resolved config file doesn\'t contain a resolve configuration`
     );
 });
 

test/no-default-config/no-config.spec.js

@@ -5,6 +5,6 @@ import {transformFixture} from '../utils';
 test('should throw an error when no config is found', t => {
     t.throws(
         () => transformFixture('basic/absolute.js', {config: 'my-webpack.config.js'}),
-        `${path.resolve(__dirname, '../fixtures/basic/absolute.js')}: Cannot find any of these configuration files: my-webpack.config.js, webpack.config.js, webpack.config.babel.js`
+        `${path.resolve(__dirname, '../fixtures/basic/absolute.js').split(path.sep).join('/')}: Cannot find any of these configuration files: my-webpack.config.js, webpack.config.js, webpack.config.babel.js`
     );
 });