fix(formatter): rewrite formatter do what it was supposed to do

- while writting a unit test, we found out the Bold Formatter was dealing with decimal values while it shouldn't

src/aurelia-slickgrid/formatters/boldFormatter.spec.ts

@@ -0,0 +1,16 @@
+import { Column } from '../models';
+import { boldFormatter } from './boldFormatter';
+
+describe('the Bold Formatter', () => {
+  it('should return an empty string when no value is passed', () => {
+    const value = null;
+    const result = boldFormatter(0, 0, value, {} as Column, {});
+    expect(result).toBe('');
+  });
+
+  it('should return a bold html formatted string when value is filled', () => {
+    const value = 'john';
+    const result = boldFormatter(0, 0, value, {} as Column, {});
+    expect(result).toBe(`<span style="font-weight: bold">${value}</span>`);
+  });
+});

src/aurelia-slickgrid/formatters/boldFormatter.ts

@@ -1,14 +1,5 @@
 import { Column, Formatter } from './../models/index';
-import { decimalFormatted } from './../services/utilities';
 
 export const boldFormatter: Formatter = (row: number, cell: number, value: any, columnDef: Column, dataContext: any) => {
-  const isNumber = (value === null || value === undefined || value === '') ? false : !isNaN(+value);
-
-  if (!isNumber) {
-    return '';
-  } else if (value >= 0) {
-    return `<span style="font-weight: bold">${decimalFormatted(value, 2, 2)}$</span>`;
-  } else {
-    return `<span style="font-weight: bold">${decimalFormatted(value, 2, 2)}$</span>`;
-  }
+  return value ? `<span style="font-weight: bold">${value}</span>` : '';
 };