diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1847ab9..f3fea86 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 
 # Changelog
 
+## Trunk
+
+* ts: api tests
+* src: rewrite in js
+
 ## Version 3.2.0
 
 * package: fix rollup dev dependencies
diff --git a/dist/pad.cjs.js b/dist/pad.cjs.js
index 5e53de2..46526bd 100644
--- a/dist/pad.cjs.js
+++ b/dist/pad.cjs.js
@@ -314,7 +314,7 @@ var lib = function lib(text, length) {
     textnocolors = text.replace(escapecolor, '');
   }
 
-  padlength = options.fixed_width ? length - (textnocolors || text).length : length - wcwidth_1.config(options.wcwidth_options)(textnocolors || text);
+  padlength = options.fixed_width === true ? length - (textnocolors || text).length : length - wcwidth_1.config(options.wcwidth_options)(textnocolors || text);
 
   if (padlength < 0) {
     if (options.strip) {
diff --git a/dist/pad.d.ts b/dist/pad.d.ts
index 213767a..914744a 100644
--- a/dist/pad.d.ts
+++ b/dist/pad.d.ts
@@ -9,10 +9,39 @@ export = pad;
 /** Left pad */
 declare function pad(length: number, text: string, char?: string): string;
 // tslint:disable-next-line unified-signatures
-declare function pad(length: number, text: string, options?: { char?: string, colors?: boolean, strip?: boolean }): string;
+declare function pad(length: number, text: string, options?: pad.Options): string;
 /** Right pad */
 declare function pad(text: string, length: number, char?: string): string;
 // tslint:disable-next-line unified-signatures
-declare function pad(text: string, length: number, options?: { char?: string, colors?: boolean, strip?: boolean }): string;
+declare function pad(text: string, length: number, options?: pad.Options): string;
 
-declare namespace pad {}
+declare namespace pad {
+  
+    interface WCWidthOptions {
+      control?: number
+      nul?: number
+    }
+      
+    interface Options {
+      /**
+       * The character used to fill the gap.
+       */
+      char?: string
+      /**
+       * Adjust to hidden terminal color characters.
+       */
+      colors?: boolean
+      /**
+       * Remove characters from text if length smaller than text length, default to "false".
+       */
+      strip?: boolean
+      /**
+       * An optimization option to disable the usage of the wcwidth package to handle the discovery of characters using more than one column for display.
+       */
+      fixed_width?: boolean
+      /**
+       * Options passed to the wcwidth package used to calculate the display width of characters using more than one column.
+       */
+      wcwidth_options?: pad.WCWidthOptions
+    }
+}
diff --git a/dist/pad.esm.js b/dist/pad.esm.js
index 25b81e1..f77698f 100644
--- a/dist/pad.esm.js
+++ b/dist/pad.esm.js
@@ -312,7 +312,7 @@ var lib = function lib(text, length) {
     textnocolors = text.replace(escapecolor, '');
   }
 
-  padlength = options.fixed_width ? length - (textnocolors || text).length : length - wcwidth_1.config(options.wcwidth_options)(textnocolors || text);
+  padlength = options.fixed_width === true ? length - (textnocolors || text).length : length - wcwidth_1.config(options.wcwidth_options)(textnocolors || text);
 
   if (padlength < 0) {
     if (options.strip) {
diff --git a/dist/pad.umd.js b/dist/pad.umd.js
index 9a9470b..6651909 100644
--- a/dist/pad.umd.js
+++ b/dist/pad.umd.js
@@ -318,7 +318,7 @@
       textnocolors = text.replace(escapecolor, '');
     }
 
-    padlength = options.fixed_width ? length - (textnocolors || text).length : length - wcwidth_1.config(options.wcwidth_options)(textnocolors || text);
+    padlength = options.fixed_width === true ? length - (textnocolors || text).length : length - wcwidth_1.config(options.wcwidth_options)(textnocolors || text);
 
     if (padlength < 0) {
       if (options.strip) {
diff --git a/test/api.types.ts b/test/api.types.ts
index 719cc60..2f6b059 100644
--- a/test/api.types.ts
+++ b/test/api.types.ts
@@ -8,8 +8,8 @@ describe('API Types', () => {
   it('Arguments', () => {
     pad('text', 5).should.eql('text ')
     pad('text', 5, {}).should.eql('text ')
-    pad(5, 'text').should.eql('text ')
-    pad(5, 'text', {}).should.eql('text ')
+    pad(5, 'text').should.eql(' text')
+    pad(5, 'text', {}).should.eql(' text')
   })
   
   it('Options', () => {