diff --git a/.gitignore b/.gitignore
index 45a2bd3..f973d07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
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 .nyc_output
-badgen.min.js
+node_modules
+dist
diff --git a/.npmignore b/.npmignore
index 48cdaea..78e9e03 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,4 +1,5 @@
 .*
+src
 test
 bench
 preview
diff --git a/package-lock.json b/package-lock.json
index cbc62ca..70d2c58 100644
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@@ -8037,54 +5292,6 @@
       "integrity": "sha1-9pPymjFbUNmp2iZGp6ZkXJaYW2o=",
       "dev": true
     },
-    "yargs": {
-      "version": "10.1.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-10.1.2.tgz",
-      "integrity": "sha512-ivSoxqBGYOqQVruxD35+EyCFDYNEFL/Uo6FcOnz+9xZdZzK0Zzw4r4KhbrME1Oo2gOggwJod2MnsdamSG7H9ig==",
-      "dev": true,
-      "requires": {
-        "cliui": "^4.0.0",
-        "decamelize": "^1.1.1",
-        "find-up": "^2.1.0",
-        "get-caller-file": "^1.0.1",
-        "os-locale": "^2.0.0",
-        "require-directory": "^2.1.1",
-        "require-main-filename": "^1.0.1",
-        "set-blocking": "^2.0.0",
-        "string-width": "^2.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^3.2.1",
-        "yargs-parser": "^8.1.0"
-      },
-      "dependencies": {
-        "find-up": {
-          "version": "2.1.0",
-          "resolved": "https://registry.npmjs.org/find-up/-/find-up-2.1.0.tgz",
-          "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
-          "dev": true,
-          "requires": {
-            "locate-path": "^2.0.0"
-          }
-        }
-      }
-    },
-    "yargs-parser": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-8.1.0.tgz",
-      "integrity": "sha512-yP+6QqN8BmrgW2ggLtTbdrOyBNSI7zBa4IykmiV5R1wl1JWNxQvWhMfMdmzIYtKU7oP3OOInY/tl2ov3BDjnJQ==",
-      "dev": true,
-      "requires": {
-        "camelcase": "^4.1.0"
-      },
-      "dependencies": {
-        "camelcase": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
-          "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
-          "dev": true
-        }
-      }
-    },
     "yn": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
diff --git a/package.json b/package.json
index af5ccf4..0868f0c 100644
--- a/package.json
+++ b/package.json
@@ -5,23 +5,22 @@
   "repository": "amio/badgen",
   "author": "Amio <amio.cn@gmail.com>",
   "license": "ISC",
-  "main": "lib/index.js",
+  "main": "dist/index.js",
   "scripts": {
     "lint": "standard",
     "bench": "node bench/index.js",
     "preview": "node preview/serve.js",
     "snaptests": "TAP_SNAPSHOT=1 npm test",
-    "pretest": "npm run lint",
+    "pretest": "npm run lint && npm run build",
     "test": "tap test/*.spec.js --reporter spec --coverage",
-    "build": "lyo -o badgen.min.js",
+    "build": "ncc -s -m build src/index.js ",
     "prepublishOnly": "npm run build"
   },
   "devDependencies": {
+    "@zeit/ncc": "^0.13.0",
     "benchmark": "^2.1.4",
     "serve-marked": "0.4.0",
     "standard": "^12.0.0",
-    "tap": "^12.0.1",
-    "lyo": "latest"
-  },
-  "dependencies": {}
+    "tap": "^12.0.1"
+  }
 }
diff --git a/lib/bare.js b/src/bare.js
similarity index 100%
rename from lib/bare.js
rename to src/bare.js
diff --git a/lib/calc-text-width.js b/src/calc-text-width.js
similarity index 100%
rename from lib/calc-text-width.js
rename to src/calc-text-width.js
diff --git a/lib/color-presets.js b/src/color-presets.js
similarity index 100%
rename from lib/color-presets.js
rename to src/color-presets.js
diff --git a/lib/index.js b/src/index.js
similarity index 97%
rename from lib/index.js
rename to src/index.js
index 4ecf8c8..090a486 100644
--- a/lib/index.js
+++ b/src/index.js
@@ -5,7 +5,6 @@ const sanitize = str => str.replace(/\u0026/g, '&amp;').replace(/\u003C/g, '&lt;
 const bare = require('./bare.js')
 
 module.exports = ({ subject, status, color, style, icon, iconWidth = 13 }) => {
-  typeAssert(typeof subject === 'string', '<subject> must be string')
   typeAssert(typeof status === 'string', '<status> must be string')
 
   if (!subject && !icon) {
diff --git a/lib/widths-verdana-110.json b/src/widths-verdana-110.json
similarity index 100%
rename from lib/widths-verdana-110.json
rename to src/widths-verdana-110.json
diff --git a/tap-snapshots/test-index.spec.js-TAP.test.js b/tap-snapshots/test-index.spec.js-TAP.test.js
index 24b0200..38246b2 100644
--- a/tap-snapshots/test-index.spec.js-TAP.test.js
+++ b/tap-snapshots/test-index.spec.js-TAP.test.js
@@ -162,3 +162,51 @@ exports[`test/index.spec.js TAP generate badge with { subject, status, icon, sty
   <image x="40" y="35" width="130" height="132" xlink:href="data:image/svg+xml;base64,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"/>
 </svg>
 `
+
+exports[`test/index.spec.js TAP generate bare badge with { status } > snapshot 1`] = `
+<svg width="47" height="20" viewBox="0 0 470 200" xmlns="http://www.w3.org/2000/svg">
+  <linearGradient id="a" x2="0" y2="100%">
+    <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
+    <stop offset="1" stop-opacity=".1"/>
+  </linearGradient>
+  <mask id="m"><rect width="470" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#m)">
+    <rect width="470" height="200" fill="#08C" x="0"/>
+    <rect width="470" height="200" fill="url(#a)"/>
+  </g>
+  <g fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
+    <text x="65" y="148" textLength="355" fill="#000" opacity="0.25">v1.0.0</text>
+    <text x="55" y="138" textLength="355">v1.0.0</text>
+  </g>
+</svg>
+`
+
+exports[`test/index.spec.js TAP generate bare badge with { status, color } > snapshot 1`] = `
+<svg width="47" height="20" viewBox="0 0 470 200" xmlns="http://www.w3.org/2000/svg">
+  <linearGradient id="a" x2="0" y2="100%">
+    <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
+    <stop offset="1" stop-opacity=".1"/>
+  </linearGradient>
+  <mask id="m"><rect width="470" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#m)">
+    <rect width="470" height="200" fill="#ADF" x="0"/>
+    <rect width="470" height="200" fill="url(#a)"/>
+  </g>
+  <g fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
+    <text x="65" y="148" textLength="355" fill="#000" opacity="0.25">v1.0.0</text>
+    <text x="55" y="138" textLength="355">v1.0.0</text>
+  </g>
+</svg>
+`
+
+exports[`test/index.spec.js TAP generate bare badge with { status, style } > snapshot 1`] = `
+<svg width="47" height="20" viewBox="0 0 470 200" xmlns="http://www.w3.org/2000/svg">
+  <g>
+    <rect fill="#08C" x="0" width="470" height="200"/>
+  </g>
+  <g fill="#fff" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
+    <text x="65" y="148" textLength="355" fill="#000" opacity="0.1">v1.0.0</text>
+    <text x="55" y="138" textLength="355">v1.0.0</text>
+  </g>
+</svg>
+`
diff --git a/test/bare.spec.js b/test/bare.spec.js
deleted file mode 100644
index 104300a..0000000
--- a/test/bare.spec.js
+++ /dev/null
@@ -1,23 +0,0 @@
-const tap = require('tap')
-const bare = require('../lib/bare.js')
-
-tap.test('generate bare badge with { status }', t => {
-  const svg = bare({ status: 'v1.0.0' })
-  t.ok(typeof svg === 'string', 'successfully generated')
-  t.matchSnapshot(svg, 'snapshot')
-  t.end()
-})
-
-tap.test('generate bare badge with { status, color }', t => {
-  const svg = bare({ status: 'v1.0.0', color: 'ADF' })
-  t.ok(typeof svg === 'string', 'successfully generated')
-  t.matchSnapshot(svg, 'snapshot')
-  t.end()
-})
-
-tap.test('generate bare badge with { status, style }', t => {
-  const svg = bare({ status: 'v1.0.0', style: 'flat' })
-  t.ok(typeof svg === 'string', 'successfully generated')
-  t.matchSnapshot(svg, 'snapshot')
-  t.end()
-})
diff --git a/test/calc-text-width.spec.js b/test/calc-text-width.spec.js
index b9032d5..f5f62f0 100644
--- a/test/calc-text-width.spec.js
+++ b/test/calc-text-width.spec.js
@@ -1,5 +1,5 @@
 const tap = require('tap')
-const calcWidth = require('../lib/calc-text-width.js').Verdana110
+const calcWidth = require('../src/calc-text-width.js').Verdana110
 
 tap.test('basic functions', t => {
   t.ok(typeof calcWidth === 'function', 'export calcWidth function')
diff --git a/test/index.spec.js b/test/index.spec.js
index 3dfa1a4..8e7f522 100644
--- a/test/index.spec.js
+++ b/test/index.spec.js
@@ -54,8 +54,28 @@ tap.test('generate badge with { subject, status, icon, style }', t => {
   t.end()
 })
 
-tap.test('type checking', t => {
-  t.throws(() => badgen({ status: '' }), TypeError, 'throw if subject is non-string')
-  t.throws(() => badgen({ subject: '' }), TypeError, 'throw if status is non-string')
+tap.test('generate bare badge with { status }', t => {
+  const svg = badgen({ status: 'v1.0.0' })
+  t.ok(typeof svg === 'string', 'successfully generated')
+  t.matchSnapshot(svg, 'snapshot')
+  t.end()
+})
+
+tap.test('generate bare badge with { status, color }', t => {
+  const svg = badgen({ status: 'v1.0.0', color: 'ADF' })
+  t.ok(typeof svg === 'string', 'successfully generated')
+  t.matchSnapshot(svg, 'snapshot')
+  t.end()
+})
+
+tap.test('generate bare badge with { status, style }', t => {
+  const svg = badgen({ status: 'v1.0.0', style: 'flat' })
+  t.ok(typeof svg === 'string', 'successfully generated')
+  t.matchSnapshot(svg, 'snapshot')
+  t.end()
+})
+
+tap.test('type checking', t => {
+  t.throws(() => badgen({}), TypeError, 'throw if status is non-string')
   t.end()
 })