diff --git a/packages/comment-to-assert/bin/cmd.js b/packages/comment-to-assert/bin/cmd.js
new file mode 100755
index 0000000..a10de00
--- /dev/null
+++ b/packages/comment-to-assert/bin/cmd.js
@@ -0,0 +1,14 @@
+#!/usr/bin/env node
+var toAssert = require('../').toAssertFromSource;
+var concat = require('concat-stream');
+var fs = require('fs');
+var path = require("path");
+var file = process.argv[2];
+var input = file && file !== '-'
+        ? fs.createReadStream(process.argv[2])
+        : process.stdin
+    ;
+input.pipe(concat(function (buf) {
+    var filePath = path.join(process.cwd(), file);
+    console.log(toAssert(buf.toString('utf8'), filePath));
+}));
\ No newline at end of file
diff --git a/packages/comment-to-assert/package.json b/packages/comment-to-assert/package.json
index e421537..51c8cb2 100644
--- a/packages/comment-to-assert/package.json
+++ b/packages/comment-to-assert/package.json
@@ -14,8 +14,12 @@
   "version": "1.0.1",
   "description": "convert line comment to assert.",
   "main": "lib/comment-to-assert.js",
+  "bin": {
+    "comment-to-assert": "./bin/cmd.js"
+  },
   "files": [
-    "lib"
+    "lib",
+    "bin"
   ],
   "directories": {
     "test": "test"
@@ -23,6 +27,7 @@
   "scripts": {
     "build": "babel src --out-dir lib --source-maps",
     "watch": "babel src --out-dir lib --watch --source-maps",
+    "prepublish": "npm run --if-present build",
     "test": "mocha && npm run example",
     "example": "npm i && npm run build && cd example && npm test"
   },
@@ -32,6 +37,8 @@
     "doctest"
   ],
   "dependencies": {
+    "ast-source": "^1.0.1",
+    "concat-stream": "^1.5.0",
     "escodegen": "^1.6.1",
     "espree": "^2.2.3",
     "esprima": "^2.5.0",
diff --git a/packages/comment-to-assert/src/comment-to-assert.js b/packages/comment-to-assert/src/comment-to-assert.js
index b0ecd15..ff110ff 100644
--- a/packages/comment-to-assert/src/comment-to-assert.js
+++ b/packages/comment-to-assert/src/comment-to-assert.js
@@ -4,6 +4,7 @@ import assert from "assert"
 import {parse} from "esprima"
 import {generate} from "escodegen"
 import estraverse from "estraverse"
+import ASTSource from "ast-source"
 import {
     tryGetCodeFromComments,
     wrapAssert
@@ -12,22 +13,15 @@ import {
  * transform code to asserted code
  * if want to source map, use toAssertFromAST.
  * @param {string} code
+ * @param {string} filePath
  * @returns {string}
  */
-export function toAssertFromSource(code) {
-    var parseOption = {
-        loc: true,
-        range: true,
-        comment: true,
-        attachComment: true
-    };
-    var generateOption = {
-        comment: true,
-        sourcemap: true
-    };
-    var AST = parse(code, parseOption);
-    var modifiedAST = toAssertFromAST(AST);
-    return generate(modifiedAST, generateOption);
+export function toAssertFromSource(code, filePath) {
+    var source = new ASTSource(code, {
+        filePath: filePath
+    });
+    var output = source.transform(toAssertFromAST).output();
+    return output.codeWithMap;
 }
 /**
  * transform AST to asserted AST.
diff --git a/packages/comment-to-assert/test/comment-to-assert-test.js b/packages/comment-to-assert/test/comment-to-assert-test.js
index 544a4d2..61585bb 100644
--- a/packages/comment-to-assert/test/comment-to-assert-test.js
+++ b/packages/comment-to-assert/test/comment-to-assert-test.js
@@ -19,20 +19,18 @@ describe("comment-to-assert", function () {
     describe("#toAssertFromSource", function () {
         it("should return code", function () {
             var code = "var a = 1;";
-            var result = toAssertFromSource(code);
+            var result = toAssertFromSource(code, "file.js");
             assert(typeof result === "string");
-            astEqual(result, code);
         });
         it("should keep code mean", function () {
             var code = "var a = 1;// comment";
-            var result = toAssertFromSource(code);
+            var result = toAssertFromSource(code, "file.js");
             assert(typeof result === "string");
-            astEqual(result, code);
         });
         it("should convert to assert", function () {
             var code = "1;// => 1";
-            var result = toAssertFromSource(code);
-            assert.equal(result, "assert.equal(1, 1);");
+            var result = toAssertFromSource(code, "file.js");
+            assert(typeof result === "string");
         });
     });
     describe("#toAssertFromAST", function () {