diff --git a/lib/operators.js b/lib/operators.js
index 79a1da6..9370ff3 100644
--- a/lib/operators.js
+++ b/lib/operators.js
@@ -51,11 +51,12 @@ function processOperation(left, right, operator) {
 	var rightType = right.type;
 	var operatorName = operators[operator];
 
-	//0. unary: i++, -x
+	//0. unary: i++, -x, !x, ~x
 	if (!left) {
 		// scalar
 		if (this.types[rightType].length === 1) {
 			var a = null, b = right;
+
 			var res = Descriptor(calculate(a, b, operator), {
 				components: [calculate(a, b, operator)],
 				type: leftType,
@@ -64,7 +65,6 @@ function processOperation(left, right, operator) {
 			return res
 		}
 
-
 		// complex
 		var outType = rightType;
 		var vec = right;
@@ -325,6 +325,10 @@ function processOperation(left, right, operator) {
 			//x + 0
 			if (right == 0) opResult = left;
 		}
+		// !a, ~a
+		else if (operator == '~' || operator == '~') {
+			opResult = operator + right
+		}
 		else if (operator == '*') {
 			//0 * x
 			if (left == 0 || left.value === 0 || right == 0) opResult = 0;
@@ -343,7 +347,7 @@ function processOperation(left, right, operator) {
 		if (opResult == null) {
 			opResult = ''
 
-			// embrace complex operators
+			// complex operators
 			if (operator != '+' && operator != '-') {
 				if (/\s/.test(left) && !(left[0] == '(' && left[left.length - 1] == ')')) opResult += '(' + left + ')'
 				else opResult += left
diff --git a/package-lock.json b/package-lock.json
index b9c751a..d34b576 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,7 +18,6 @@
       },
       "devDependencies": {
         "almost-equal": "^1.1.0",
-        "cln": "^1.1.0",
         "gl-matrix": "^2.3.2",
         "glslify": "^7.1.1",
         "glslify-promise": "^1.0.2",
@@ -138,12 +137,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/cln": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/cln/-/cln-1.1.0.tgz",
-      "integrity": "sha512-hpXT0qDhgAP8RvpgrEfHFlRL5j+1wM3mASZQPDXCeDBuyhB71LRthpqxQNNGTAavrvfKO7g8Y60HJ9BN1Jk18w==",
-      "dev": true
-    },
     "node_modules/commander": {
       "version": "2.20.3",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
@@ -2289,12 +2282,6 @@
         "get-intrinsic": "^1.0.2"
       }
     },
-    "cln": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/cln/-/cln-1.1.0.tgz",
-      "integrity": "sha512-hpXT0qDhgAP8RvpgrEfHFlRL5j+1wM3mASZQPDXCeDBuyhB71LRthpqxQNNGTAavrvfKO7g8Y60HJ9BN1Jk18w==",
-      "dev": true
-    },
     "commander": {
       "version": "2.20.3",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
diff --git a/package.json b/package.json
index b1ef75d..a6a5df3 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,6 @@
   },
   "devDependencies": {
     "almost-equal": "^1.1.0",
-    "cln": "^1.1.0",
     "gl-matrix": "^2.3.2",
     "glslify": "^7.1.1",
     "glslify-promise": "^1.0.2",
diff --git a/test/api.js b/test/api.js
index b0839cd..63b8009 100644
--- a/test/api.js
+++ b/test/api.js
@@ -6,7 +6,7 @@ import CompileStream from '../stream.js'
 import test from 'tape'
 import StringStream from 'stream-array'
 import { Writable } from 'stream'
-import clean from 'cln'
+import clean from './util/clean.js'
 
 var compile = GLSL({})
 
diff --git a/test/functions.js b/test/functions.js
index 5ffe324..b2d9f26 100644
--- a/test/functions.js
+++ b/test/functions.js
@@ -1,7 +1,7 @@
 import test from 'tape'
 import GLSL, { compile } from '../index.js'
 import evaluate from './util/eval.js'
-import clean from 'cln'
+import clean from './util/clean.js'
 import almost from './util/almost.js'
 
 
diff --git a/test/index.html b/test/index.html
index 9c1f226..3db300e 100644
--- a/test/index.html
+++ b/test/index.html
@@ -6,7 +6,7 @@
 <script type="importmap">
 {
   "imports": {
-    "tape" : "../node_modules/tape/tape.js",
+    "tape" : "../node_modules/tape/tape.js"
   }
 }
 </script>
diff --git a/test/index.js b/test/index.js
index dd7e224..0d7bf97 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1,7 +1,7 @@
 import GLSL from '../index.js'
 import test from 'tape'
 import evaluate from './util/eval.js'
-import clean from 'cln'
+import clean from './util/clean.js'
 import glsl from 'glslify'
 
 import './functions.js'
@@ -608,6 +608,13 @@ test.skip('varying mat3 m[3]; m[1][0] = vec3(1., 1., 0.); m;', function (t) {
 	t.end()
 })
 
+// #61
+test('foo=2.1;~~foo;', function (t) {
+	var compile = GLSL({ version: '300 es' })
+	t.deepEqual(evaluate(t.name, { version: '300 es' }), 2)
+	t.end()
+})
+
 // 	`
 // 	vec2 pos;
 // 	float height;
diff --git a/test/preprocessor.js b/test/preprocessor.js
index 0ab7d07..0a33226 100644
--- a/test/preprocessor.js
+++ b/test/preprocessor.js
@@ -1,6 +1,6 @@
 import test from 'tape'
-import {compile} from '../index.js'
-import clean from 'cln'
+import { compile } from '../index.js'
+import clean from './util/clean.js'
 
 test('Transform macro to commented', function (t) {
 	t.equal(clean(compile(`
diff --git a/test/primitives.js b/test/primitives.js
index 73a1b69..3b25354 100644
--- a/test/primitives.js
+++ b/test/primitives.js
@@ -1,7 +1,7 @@
 import GLSL from '../index.js'
 import test from 'tape'
 import evaluate from './util/eval.js'
-import clean from 'cln'
+import clean from './util/clean.js'
 
 
 var compile = GLSL({})
@@ -106,7 +106,7 @@ test('float(uint)', function (t) {
 
 // converts a Boolean value to a float
 test('float(bool)', function (t) {
-	t.equal(evaluate('+float(true);', {debug: false}), 1);
+	t.equal(evaluate('+float(true);', { debug: false }), 1);
 	t.equal(evaluate('+float(false);'), 0);
 	t.end()
 })
@@ -143,7 +143,7 @@ test('double(float)', function (t) {
 })
 
 
-test('should allow valid int initializations', function(t) {
+test('should allow valid int initializations', function (t) {
 	t.equal(
 		clean(compile('void main() { int test = 1; }')),
 		clean('function main () {\nvar test = 1;\n};'));
@@ -162,7 +162,7 @@ test('should allow valid int initializations', function(t) {
 	t.end()
 })
 
-test('should allow valid float initializations', function(t) {
+test('should allow valid float initializations', function (t) {
 	t.equal(
 		clean(compile('void main() { float test = 1.0; }')),
 		clean('function main () {\nvar test = 1.0;\n};'));
@@ -193,7 +193,7 @@ test('should allow valid float initializations', function(t) {
 	t.end()
 })
 
-test('should allow valid bool initializations', function(t) {
+test('should allow valid bool initializations', function (t) {
 	t.equal(
 		clean(compile('void main() { bool test = true; }')),
 		clean('function main () {\nvar test = true;\n};'));
@@ -206,50 +206,50 @@ test('should allow valid bool initializations', function(t) {
 	t.end()
 })
 
-test.skip('should throw on invalid int initializations', function(t) {
-	t.throws('void main() { int test = 1.0; }',    /Left and right arguments are of differing types/);
-	t.throws('void main() { int test = .04; }',    /Left and right arguments are of differing types/);
-	t.throws('void main() { int test = 0.50; }',   /Left and right arguments are of differing types/);
-	t.throws('void main() { int test = 55.23; }',  /Left and right arguments are of differing types/);
-	t.throws('void main() { int test = 5e3; }',    /Left and right arguments are of differing types/);
-	t.throws('void main() { int test = 5.5e3; }',  /Left and right arguments are of differing types/);
+test.skip('should throw on invalid int initializations', function (t) {
+	t.throws('void main() { int test = 1.0; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { int test = .04; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { int test = 0.50; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { int test = 55.23; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { int test = 5e3; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { int test = 5.5e3; }', /Left and right arguments are of differing types/);
 	t.throws('void main() { int test = 5.5e-3; }', /Left and right arguments are of differing types/);
-	t.throws('void main() { int test = .5e3; }',   /Left and right arguments are of differing types/);
-	t.throws('void main() { int test = true; }',   /Left and right arguments are of differing types/);
-	t.throws('void main() { int test = false; }',  /Left and right arguments are of differing types/);
+	t.throws('void main() { int test = .5e3; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { int test = true; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { int test = false; }', /Left and right arguments are of differing types/);
 	t.end()
 })
 
 
-test.skip('should throw on invalid float initializations', function(t) {
-	t.throws('void main() { float test = 1; }',     /Left and right arguments are of differing types/);
-	t.throws('void main() { float test = 55; }',    /Left and right arguments are of differing types/);
-	t.throws('void main() { float test = 0x23; }',  /Left and right arguments are of differing types/);
-	t.throws('void main() { float test = 023; }',   /Left and right arguments are of differing types/);
-	t.throws('void main() { float test = true; }',  /Left and right arguments are of differing types/);
+test.skip('should throw on invalid float initializations', function (t) {
+	t.throws('void main() { float test = 1; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { float test = 55; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { float test = 0x23; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { float test = 023; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { float test = true; }', /Left and right arguments are of differing types/);
 	t.throws('void main() { float test = false; }', /Left and right arguments are of differing types/);
 	t.end()
 })
 
-test.skip('should throw on invalid bool initializations', function(t) {
-	t.throws('void main() { bool test = 1; }',      /Left and right arguments are of differing types/);
-	t.throws('void main() { bool test = 55; }',     /Left and right arguments are of differing types/);
-	t.throws('void main() { bool test = 0x23; }',   /Left and right arguments are of differing types/);
-	t.throws('void main() { bool test = 023; }',    /Left and right arguments are of differing types/);
-	t.throws('void main() { bool test = 1.0; }',    /Left and right arguments are of differing types/);
-	t.throws('void main() { bool test = .04; }',    /Left and right arguments are of differing types/);
-	t.throws('void main() { bool test = 0.50; }',   /Left and right arguments are of differing types/);
-	t.throws('void main() { bool test = 55.23; }',  /Left and right arguments are of differing types/);
-	t.throws('void main() { bool test = 5e3; }',    /Left and right arguments are of differing types/);
-	t.throws('void main() { bool test = 5.5e3; }',  /Left and right arguments are of differing types/);
+test.skip('should throw on invalid bool initializations', function (t) {
+	t.throws('void main() { bool test = 1; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { bool test = 55; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { bool test = 0x23; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { bool test = 023; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { bool test = 1.0; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { bool test = .04; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { bool test = 0.50; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { bool test = 55.23; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { bool test = 5e3; }', /Left and right arguments are of differing types/);
+	t.throws('void main() { bool test = 5.5e3; }', /Left and right arguments are of differing types/);
 	t.throws('void main() { bool test = 5.5e-3; }', /Left and right arguments are of differing types/);
-	t.throws('void main() { bool test = .5e3; }',   /Left and right arguments are of differing types/);
+	t.throws('void main() { bool test = .5e3; }', /Left and right arguments are of differing types/);
 	t.end()
 })
 
 
 
-test('should default ints to 0', function(t) {
+test('should default ints to 0', function (t) {
 	t.equal(
 		clean(compile('void main() { int test; }')),
 		clean('function main () {\nvar test = 0;\n};'));
@@ -259,23 +259,22 @@ test('should default ints to 0', function(t) {
 	t.end()
 })
 
-test('should default floats to 0.0', function(t) {
+test('should default floats to 0.0', function (t) {
 	t.equal(
 		clean(compile('void main() { float test; }')),
 		clean('function main () {\nvar test = 0;\n};'));
 	t.equal(
 		clean(compile('void main() { float test, foo; }')),
-	clean('function main () {\nvar test = 0, foo = 0;\n};'));
+		clean('function main () {\nvar test = 0, foo = 0;\n};'));
 	t.end()
 })
 
-test('should default bools to 0 (false)', function(t) {
+test('should default bools to 0 (false)', function (t) {
 	t.equal(
 		clean(compile('void main() { bool test; }')),
 		clean('function main () {\nvar test = false;\n};'));
 	t.equal(
 		clean(compile('void main() { bool test, foo; }')),
-	clean('function main () {\nvar test = false, foo = false;\n};'));
+		clean('function main () {\nvar test = false, foo = false;\n};'));
 	t.end()
 })
-
diff --git a/test/structs.js b/test/structs.js
index fddeb09..590ef18 100644
--- a/test/structs.js
+++ b/test/structs.js
@@ -1,7 +1,7 @@
 import GLSL from '../index.js'
 import test from 'tape'
 import evaluate from './util/eval.js'
-import clean from 'cln'
+import clean from './util/clean.js'
 
 var compile = GLSL({})
 
diff --git a/test/util/clean.js b/test/util/clean.js
new file mode 100644
index 0000000..620d36b
--- /dev/null
+++ b/test/util/clean.js
@@ -0,0 +1,17 @@
+export default function clean(str) {
+  if (Array.isArray(str)) str = String.raw.apply(String, arguments)
+
+  return str.trim()
+
+    //remove empty lines
+    .replace(/^\s*\n/gm, '')
+
+    //remove indentation/tabulation
+    .replace(/^\s*/gm, '')
+
+    //transform all \r to \n
+    .replace(/[\n\r]+/g, '\n')
+
+    //replace duble spaces/tabs to single ones
+    .replace(/(\s)\s+/g, '$1')
+}
diff --git a/test/vectors.js b/test/vectors.js
index b294168..35e5161 100644
--- a/test/vectors.js
+++ b/test/vectors.js
@@ -3,7 +3,7 @@ import test from 'tape'
 import GLSL, { compile } from '../index.js'
 import almost from './util/almost.js'
 import evaluate from './util/eval.js'
-import clean from 'cln'
+import clean from './util/clean.js'
 
 // constructors