add rounding type option

CHANGELOG.md

@@ -0,0 +1,7 @@
+## 0.1.0 - 2018-08-28
+- **BREAKING** changed default rounding type from `significant`
+- Add `rounding` option, now rounding type can be specified: `default`, `significant`, `fixed` 
+- Fixed ending zeros not stripped after rounding
+
+## 0.0.1 - 2018-07-31
+- Initial 

README.md

@@ -31,9 +31,44 @@ prettyNum(12.123e-10); // => '0.0000000012123'
 prettyNum(0.00123456, {precision: 3}); // => '0.00123'
 prettyNum(12345678.12345, {thousandsSeparator: ' '}); // => '12 345 678.12345'
 prettyNum('00123456789.12300e-2', {precision: 3, thousandsSeparator: ' '}); // => '1 234 567.891'
+```
+
+### Options
+
+#### thousandsSeparator
+Defines the thousand grouping separator character
 
+#### precision
+Number of decimal digits to keep when rounding. Pass falsey value to not change precision.
+
+#### rounding
+Rounding type
+- `'default'` - reduce precision to specified number of decimal digits, strip unnecessary ending zeros. 
+
+```js
+prettyNum(0.01023456, {precision: 3});
+// => '0.01'
+prettyNum(0.00001203456, {precision: 3});
+// => '0'
 ```
 
+- `'significant'` - reduce precision to specified number of significant decimal digits, strip unnecessary ending zeros. Useful when rounding small values and they should not be rounded to 0
+```js
+prettyNum(0.01023456, {precision: 3, rounding: 'significant'});
+// => '0.0102'
+prettyNum(0.00001203456, {precision: 3, rounding: 'significant'});
+// => '0.000012'
+```  
+
+- `'fixed'` - reduce precision to specified number of decimal digits, pad with ending zeros.
+```js
+prettyNum(0.01023456, {precision: 3, rounding: 'significant'});
+// => '0.010'
+prettyNum(0.00001203456, {precision: 3, rounding: 'fixed'});
+// => '0.000'
+``` 
+
+
 
 ## License
 

build/rollup.config.js

@@ -9,12 +9,12 @@ export default {
         resolve(),
         babel({
             babelrc: false,
-            presets: [['env', { modules: false }]],
+            presets: [['@babel/preset-env', { modules: false }]],
         }),
     ],
     output: {
         file: 'dist/index.js',
         format: 'umd',
         name: 'prettyNum',
     }
-};
+};

build/rollup.uglify.config.js

@@ -10,7 +10,7 @@ export default {
         resolve(),
         babel({
             babelrc: false,
-            presets: [['env', { modules: false }]],
+            presets: [['@babel/preset-env', { modules: false }]],
         }),
         terser(), // uglifyjs alternative with es6 support
     ],
@@ -19,4 +19,4 @@ export default {
         format: 'umd',
         name: 'prettyNum',
     }
-};
+};