Use native Object.assign()

.travis.yml

@@ -1,7 +1,9 @@
 language: node_js
 node_js:
   - "4"
+  - "5"
   - "6"
+  - "7"
 sudo: false
 install:
   - npm install npm -g

package.json

@@ -21,6 +21,9 @@
     "typescript",
     "ts"
   ],
+  "engines": {
+    "node": ">=4.3.0 <5.0.0 || >=5.10"
+  },
   "author": "James Brantly <james@jbrantly.com> (http://www.jbrantly.com/)",
   "license": "MIT",
   "bugs": {
@@ -31,7 +34,6 @@
     "colors": "^1.0.3",
     "enhanced-resolve": "^3.0.0",
     "loader-utils": "^0.2.6",
-    "object-assign": "^4.1.0",
     "semver": "^5.0.1"
   },
   "devDependencies": {

src/compilerSetup.ts

@@ -1,5 +1,4 @@
 import typescript = require('typescript');
-import objectAssign = require('object-assign');
 const semver = require('semver');
 
 import interfaces = require('./interfaces');
@@ -46,7 +45,7 @@ export function getCompilerOptions(
     compiler: typeof typescript,
     configParseResult: typescript.ParsedCommandLine
 ) {
-    const compilerOptions = objectAssign({}, configParseResult.options, {
+    const compilerOptions = Object.assign({}, configParseResult.options, {
         skipDefaultLibCheck: true,
         suppressOutputPathCheck: true, // This is why: https://github.com/Microsoft/TypeScript/issues/7363
     });

src/config.ts

@@ -1,4 +1,3 @@
-import objectAssign = require('object-assign');
 import typescript = require('typescript');
 import path = require('path');
 
@@ -52,7 +51,7 @@ export function getConfigFile(
     }
 
     if (!configFileError) {
-        configFile.config.compilerOptions = objectAssign({},
+        configFile.config.compilerOptions = Object.assign({},
             configFile.config.compilerOptions,
             loaderOptions.compilerOptions);
 

src/index.ts

@@ -1,6 +1,5 @@
 import path = require('path');
 import loaderUtils = require('loader-utils');
-import objectAssign = require('object-assign');
 require('colors');
 
 import instances = require('./instances');
@@ -73,7 +72,7 @@ function getLoaderOptions(loader: interfaces.Webpack) {
         return loaderOptionsCache[instanceName];
     }
 
-    const options = objectAssign({}, {
+    const options = Object.assign({}, {
         silent: false,
         logLevel: 'INFO',
         logInfoToStdOut: false,
@@ -203,7 +202,7 @@ function makeSourceMap(
 
     return {
         output: outputText.replace(/^\/\/# sourceMappingURL=[^\r\n]*/gm, ''),
-        sourceMap: objectAssign(JSON.parse(sourceMapText), {
+        sourceMap: Object.assign(JSON.parse(sourceMapText), {
             sources: [loaderUtils.getRemainingRequest(loader)],
             file: filePath,
             sourcesContent: [contents]

src/tsconfig.json

@@ -1,12 +1,16 @@
 {
     "compilerOptions": {
+        "target": "es5",
         "noImplicitAny": true,
         "noImplicitReturns": true,
         "noImplicitThis": false,
         "noUnusedLocals": true,
         "noUnusedParameters": true,
         "suppressImplicitAnyIndexErrors": true,
         "strictNullChecks": false,
+        "lib": [
+            "es5", "es2015.core"
+        ],
         "module": "commonjs",
         "moduleResolution": "node",
         "outDir": "../dist"

src/typings/console.log.d.ts

@@ -0,0 +1 @@
+declare const console: { log(...args: any[]): void };

src/utils.ts

@@ -1,7 +1,7 @@
 import typescript = require('typescript');
 import path = require('path');
 import fs = require('fs');
-import objectAssign = require('object-assign');
+
 import constants = require('./constants');
 import interfaces = require('./interfaces');
 
@@ -46,7 +46,7 @@ export function formatErrors(
             } else {
                 error = makeError({ rawMessage: messageText });
             }
-            return <interfaces.WebpackError>objectAssign(error, merge);
+            return <interfaces.WebpackError>Object.assign(error, merge);
         });
 }
 
@@ -73,7 +73,7 @@ export function makeError({ rawMessage, message, location, file }: MakeError): i
         loaderSource: 'ts-loader'
     };
 
-    return <interfaces.WebpackError>objectAssign(error, { location, file });
+    return <interfaces.WebpackError>Object.assign(error, { location, file });
 }
 
 export function appendTsSuffixIfMatch(patterns: RegExp[], path: string): string {

test/comparison-tests/nodeModulesMeaningfulErrorWhenImportingTs/expectedOutput-2.0/output.txt

@@ -4,9 +4,9 @@ chunk    {0} bundle.js (main) 52 bytes [rendered]
     [0] ./.test/nodeModulesMeaningfulErrorWhenImportingTs/app.ts 52 bytes {0} [built] [1 error]
 
 ERROR in ./.test/nodeModulesMeaningfulErrorWhenImportingTs/~/a/index.ts
-Module build failed: Error: Typescript emitted no output for node_modules\a\index.ts.
+Module build failed: Error: Typescript emitted no output for node_modules/a/index.ts.
 You should not need to recompile .ts files in node_modules.
 Please contact the package author to advise them to use --declaration --outDir.
 More https://github.com/Microsoft/TypeScript/issues/12358
-    at Object.loader (dist\index.js:33:15)
+    at Object.loader (dist/index.js:32:15)
  @ ./.test/nodeModulesMeaningfulErrorWhenImportingTs/app.ts 2:8-20

test/comparison-tests/nodeModulesMeaningfulErrorWhenImportingTs/expectedOutput-2.1/output.txt

@@ -5,9 +5,9 @@ chunk    {0} bundle.js (main) 501 bytes [entry] [rendered]
     [1] ./.test/nodeModulesMeaningfulErrorWhenImportingTs/app.ts 52 bytes {0} [built]
 
 ERROR in ./.test/nodeModulesMeaningfulErrorWhenImportingTs/~/a/index.ts
-Module build failed: Error: Typescript emitted no output for node_modules\a\index.ts.
+Module build failed: Error: Typescript emitted no output for node_modules/a/index.ts.
 You should not need to recompile .ts files in node_modules.
 Please contact the package author to advise them to use --declaration --outDir.
 More https://github.com/Microsoft/TypeScript/issues/12358
-    at Object.loader (dist\index.js:33:15)
+    at Object.loader (dist/index.js:32:15)
  @ ./.test/nodeModulesMeaningfulErrorWhenImportingTs/app.ts 2:8-20