Use a fake outDir option for --allowJs support

package.json

@@ -50,6 +50,7 @@
     "mocha": "^2.1.0",
     "ntypescript": "^1.201507091536.1",
     "proxyquire": "^1.7.2",
+    "semver": "^5.1.0",
     "tslint": "^3.10.2",
     "tslint-config-standard": "^1.0.0",
     "typescript": "1.8.7",

src/index.spec.ts

@@ -1,6 +1,8 @@
 import { expect } from 'chai'
 import { exec } from 'child_process'
 import { join, normalize } from 'path'
+import semver = require('semver')
+import ts = require('typescript')
 import proxyquire = require('proxyquire')
 import { register, VERSION } from './index'
 
@@ -43,6 +45,24 @@ describe('ts-node', function () {
       })
     })
 
+    if (semver.gte(ts.version, '1.8.0')) {
+      it('should allow js', function (done) {
+        exec(
+          [
+            BIN_EXEC,
+            '-o "{\\\"allowJs\\\":true}"',
+            '-p "import { main } from \'./tests/allow-js/run\';main()"'
+          ].join(' '),
+          function (err, stdout) {
+            expect(err).to.not.exist
+            expect(stdout).to.equal('hello world\n')
+
+            return done()
+          }
+        )
+      })
+    }
+
     it('should eval code', function (done) {
       exec(
         `${BIN_EXEC} -e "import * as m from './tests/module';console.log(m.example('test'))"`,

src/index.ts

@@ -97,10 +97,15 @@ function readConfig (options: Options, cwd: string, ts: TSCommon) {
       inlineSourceMap: true,
       inlineSources: true,
       declaration: false,
-      noEmit: false
+      noEmit: false,
+      outDir: `tmp${Math.random().toString(36).substr(2)}`
     }
   )
 
+  // Delete options that *should not* be passed through.
+  delete result.config.compilerOptions.out
+  delete result.config.compilerOptions.outFile
+
   // Resolve before getting `dirname` to work around Microsoft/TypeScript#2965
   const basePath = fileName ? dirname(resolve(fileName)) : cwd
 

tests/allow-js/run.js

@@ -0,0 +1,3 @@
+export function main () {
+  return 'hello world'
+}

typings.json

@@ -17,5 +17,8 @@
   "globalDevDependencies": {
     "chai": "registry:dt/chai#3.4.0+20160216071402",
     "mocha": "registry:dt/mocha#2.2.5+20151023103246"
+  },
+  "devDependencies": {
+    "semver": "registry:npm/semver#5.0.0+20160211003958"
   }
 }