possibility to provide any processor options

Author: Alexey Litvinov

lib/index.js

@@ -26,7 +26,7 @@ module.exports = function setupHook({
   ignore,
   preprocessCss = identity,
   processCss,
-  to,
+  processorOpts,
   append = [],
   prepend = [],
   createImportedName,
@@ -96,7 +96,7 @@ module.exports = function setupHook({
 
     const source = preprocessCss(readFileSync(filename, 'utf8'), filename);
     // https://github.com/postcss/postcss/blob/master/docs/api.md#processorprocesscss-opts
-    const lazyResult = runner.process(source, assign({}, {from: filename}));
+    const lazyResult = runner.process(source, assign({}, processorOpts, {from: filename}));
 
     // https://github.com/postcss/postcss/blob/master/docs/api.md#lazywarnings
     lazyResult.warnings().forEach(message => console.warn(message.text));

lib/validate.js

@@ -9,7 +9,7 @@ const rules = {
   ignore:             'function|regex|string',
   preprocessCss:      'function',
   processCss:         'function',
-  to:                 'string',
+  processorOpts:      'object',
   // plugins
   append:             'array',
   prepend:            'array',
@@ -24,6 +24,7 @@ const tests = {
   array:    require('lodash').isArray,
   boolean:  require('lodash').isBoolean,
   function: require('lodash').isFunction,
+  object:   require('lodash').isPlainObject,
   regex:    require('lodash').isRegExp,
   string:   require('lodash').isString,
 };

package.json

@@ -57,6 +57,7 @@
     "in-publish": "^2.0.0",
     "isparta": "^4.0.0",
     "mocha": "^2.4.5",
+    "postcss-less": "^0.2.0",
     "sinon": "^1.17.3"
   }
 }

test/api/fixture/oceanic.less

@@ -0,0 +1,4 @@
+.color
+{
+  background: #1e2a35;
+}

test/api/processorOpts.js

@@ -0,0 +1,25 @@
+const detachHook = require('../sugar').detachHook;
+const dropCache = require('../sugar').dropCache;
+const identity = require('lodash').identity;
+
+const lessParser = require('postcss-less').parse;
+
+// https://github.com/postcss/postcss/blob/master/docs/api.md#processorprocesscss-opts
+suite('api/processorOpts()', () => {
+  test('should provide possibility to specify custom processor options, for example: parser', () => {
+    const tokens = require('./fixture/oceanic.less');
+    assert.deepEqual(tokens, {color: '_test_api_fixture_oceanic__color'});
+  });
+
+  setup(() => {
+    hook({
+      extensions: '.less',
+      processorOpts: {parser: lessParser},
+    });
+  });
+
+  teardown(() => {
+    detachHook('.less');
+    dropCache('./api/fixture/oceanic.less');
+  });
+});