possibility to set up "to" option to the lazyResult instance

Author: mightyaleksey

package.json

@@ -7,10 +7,12 @@
     "node": ">=0.12"
   },
   "dependencies": {
+    "lodash.assign": "^3.2.0",
     "lodash.identity": "^3.0.0",
     "lodash.isarray": "^3.0.4",
     "lodash.isfunction": "^3.0.6",
-    "lodash.isstring": "^3.0.1"
+    "lodash.isstring": "^3.0.1",
+    "lodash.pick": "^3.1.0"
   },
   "devDependencies": {
     "babel": "^5.8.20",

src/index.js

@@ -2,7 +2,9 @@ import hook from './hook';
 import { readFileSync } from 'fs';
 import { dirname, sep, relative, resolve } from 'path';
 import { get, removeQuotes } from './utility';
+import assign from 'lodash.assign';
 import identity from 'lodash.identity';
+import pick from 'lodash.pick';
 import postcss from 'postcss';
 
 import ExtractImports from 'postcss-modules-extract-imports';
@@ -17,6 +19,7 @@ let tokensByFile = {};
 const preProcess = identity;
 let postProcess;
 // defaults
+let lazyResultOpts = {};
 let plugins = [LocalByDefault, ExtractImports, Scope];
 let rootDir = process.cwd();
 
@@ -26,6 +29,7 @@ let rootDir = process.cwd();
  * @param  {function} opts.generateScopedName
  * @param  {function} opts.processCss
  * @param  {string}   opts.rootDir
+ * @param  {string}   opts.to
  * @param  {array}    opts.use
  */
 export default function setup(opts = {}) {
@@ -35,6 +39,8 @@ export default function setup(opts = {}) {
 
   postProcess = get('processCss', null, 'function', opts) || null;
   rootDir = get('rootDir', ['root', 'd'], 'string', opts) || process.cwd();
+  // https://github.com/postcss/postcss/blob/master/docs/api.md#processorprocesscss-opts
+  lazyResultOpts = pick(opts, ['to']);
 
   const customPlugins = get('use', ['u'], 'array', opts);
   if (customPlugins) {
@@ -83,7 +89,7 @@ function fetch(_newPath, _sourcePath, _trace) {
   const CSSSource = preProcess(readFileSync(filename, 'utf8'));
 
   const result = postcss(plugins.concat(new Parser({ fetch, trace })))
-    .process(CSSSource, {from: rootRelativePath})
+    .process(CSSSource, assign(lazyResultOpts, {from: rootRelativePath}))
     .root;
 
   tokens = result.tokens;