Updated opacity value type

package.json

@@ -123,8 +123,10 @@
           "description": "%configuration.folders.color%"
         },
         "material-icon-theme.opacity": {
-          "type": "string",
-          "default": "1",
+          "type": "number",
+          "default": 1,
+          "minimum": 0,
+          "maximum": 1,
           "description": "%configuration.opacity%"
         },
         "material-icon-theme.hidesExplorerArrows": {

src/icons/generator/iconOpacity.ts

@@ -5,9 +5,9 @@ import * as path from 'path';
  * Changes the opacity of all icons in the set.
  * @param opacity Opacity value
  */
-export const setIconOpacity = (opacity: string) => {
+export const setIconOpacity = (opacity: number) => {
     if (!validateOpacityValue(opacity)) {
-        return Promise.reject('Invalid opacity value! Opacity must be a decimal number between 0 and 1!');
+        return console.error('Invalid opacity value! Opacity must be a decimal number between 0 and 1!');
     }
 
     return new Promise((resolve, reject) => {
@@ -55,8 +55,8 @@ export const setIconOpacity = (opacity: string) => {
  * Validate the opacity value.
  * @param opacity Opacity value
  */
-export const validateOpacityValue = (opacity: string) => {
-    return +opacity >= 0 && +opacity <= 1;
+export const validateOpacityValue = (opacity: number) => {
+    return opacity <= 1 && opacity >= 0;
 };
 
 /**
@@ -77,7 +77,7 @@ const getSVGRootElement = (svg: string) => {
  * @param svgRoot Root element of the SVG icon.
  * @param opacity Opacity value.
  */
-const addOpacityAttribute = (svgRoot: string, opacity: string) => {
+const addOpacityAttribute = (svgRoot: string, opacity: number) => {
     const pattern = new RegExp(/\sopacity="[\d.]+"/);
     // if the opacity attribute already exists
     if (pattern.test(svgRoot)) {

src/icons/generator/jsonGenerator.ts

@@ -25,7 +25,7 @@ export const generateIconConfigurationObject = (options: IconJsonOptions): IconC
  */
 export const createIconFile = async (jsonOptions?: IconJsonOptions) => {
     // override the default options with the new options
-    const options = merge({}, getDefaultIconOptions(), jsonOptions);
+    const options: IconJsonOptions = merge({}, getDefaultIconOptions(), jsonOptions);
 
     const iconJSONPath = path.join(__dirname, '../../../', 'src', iconJsonName);
     const json = generateIconConfigurationObject(options);
@@ -59,7 +59,7 @@ export const getDefaultIconOptions = (): IconJsonOptions => ({
     },
     activeIconPack: 'angular',
     hidesExplorerArrows: false,
-    opacity: '1',
+    opacity: 1,
     files: { associations: {} },
     languages: { associations: {} },
 });

src/models/icons/iconJsonOptions.ts

@@ -1,7 +1,7 @@
 export interface IconJsonOptions {
     activeIconPack?: string;
     hidesExplorerArrows?: boolean;
-    opacity?: string;
+    opacity?: number;
     folders?: {
         theme?: string;
         color?: string;