Fix #6: issue with relative paths

Transforms specified in package.json were being resolved relative
to the current file, as oppoosed to relative to the package.json
file. This would cause the resolve to fail on files not in the
root directory if the transform was specified as a relative file.

Author: hughsk

fixtures/relative/index.js

@@ -0,0 +1,3 @@
+const regl = require('regl/lib/util/check')
+
+console.log(regl)

fixtures/relative/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "fixture",
+  "version": "1.0.0",
+  "browserify": {
+    "transform": [
+      "brfs"
+    ]
+  }
+}

index.js

@@ -43,7 +43,7 @@ function loader (source) {
         }
 
         resolve(name, {
-          basedir: dirname
+          basedir: pkgDir
         }, function (err, name) {
           if (err) return next(err)
 

package.json

@@ -21,11 +21,12 @@
   "devDependencies": {
     "brfs": "^1.4.2",
     "npm-which": "^2.0.0",
+    "regl": "^1.3.0",
     "standard": "^5.4.1",
     "tap-spec": "^4.1.1",
     "tape": "^4.4.0",
     "through2": "^2.0.0",
-    "webpack": "^1.12.9"
+    "webpack": "^2.2.1"
   },
   "scripts": {
     "test": "node test.js | tspec",

test.js

@@ -39,6 +39,33 @@ test('ify-loader', function (t) {
   })
 })
 
+test('relative transforms', function (t) {
+  const wpack = which.sync('webpack', { cwd: __dirname })
+  const input = path.join(__dirname, 'fixtures', 'relative', 'index.js')
+  const output = path.join(__dirname, 'fixtures', 'relative', 'bundle.js')
+
+  t.plan(2)
+
+  try {
+    fs.unlinkSync(output)
+  } catch (e) {}
+
+  spawn(wpack, [
+    input,
+    output,
+    '--module-bind', 'js=' + __dirname
+  ], {
+    stdio: ['pipe', 'pipe', 2]
+  }).once('exit', function (code) {
+    t.doesNotThrow(function () {
+      fs.statSync(output)
+    }, 'bundle.js was created')
+    fs.unlinkSync(output)
+
+    t.ok(!code, 'exit code was 0')
+  })
+})
+
 test('error handling', function (t) {
   const wpack = which.sync('webpack', { cwd: __dirname })
   const input = path.join(__dirname, 'fixtures', 'errors', 'index.js')