fix: 🐛 ensures name subset helper always has a unique name

BREAKING CHANGE: The `IconNameSubset` helper is now dynamically
generated based off of the `interfaceName` property. Any references to
this will need updating.

fix nivekcode#91

README.md

@@ -1,7 +1,9 @@
 ![Logo](https://raw.githubusercontent.com/kreuzerk/svg-to-ts/master/assets/logo.png)
 
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
+
 [![All Contributors](https://img.shields.io/badge/all_contributors-9-orange.svg?style=flat-square)](#contributors-)
+
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
@@ -382,12 +384,12 @@ advantages:
 
 ## Can I use the icons to generate a type?
 
-If you have a method that decides which icon should be returned its useful to add a return type. To do so you can take advantage of the `IconNameSubset` helper generated by `svg-to-ts`.
+If you have a method that decides which icon should be returned its useful to add a return type. To do so you can take advantage of the name subset helper generated by `svg-to-ts`. The name of the helper will be dynamically generated depending upon the value provided for the `interfaceName` property. An `interfaceName` of `MyIcon` will generate a helper called `MyIconNameSubset` as shown in the following example.
 
 ```typescript
 import {IconNameSubset, myIconSmile, myIconLaugh} from 'my-icon-lib';
 
-type emojiIcons = IconNameSubset<[typeof myIconSmile, typeof myIconLaugh]>;
+type emojiIcons = MyIconNameSubset<[typeof myIconSmile, typeof myIconLaugh]>;
 
 // resulting type is equal to type = 'smile' | 'laugh';
 
@@ -422,6 +424,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 
 <!-- markdownlint-enable -->
 <!-- prettier-ignore-end -->
+
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!

src/lib/generators/code-snippet-generators.spec.ts

@@ -156,7 +156,7 @@ describe('Generators', () => {
     it('should generate the correct type helper statement', () => {
       const interfaceName = 'MyIcons';
       const expectedStatement = `
-        export type IconNameSubset<T extends Readonly<${interfaceName}[]>> = T[number]['name'];
+        export type ${interfaceName}NameSubset<T extends Readonly<${interfaceName}[]>> = T[number]['name'];
        `;
 
       const generatedStatement = generateTypeHelper(interfaceName);
@@ -170,7 +170,7 @@ describe('Generators', () => {
 
       const expectedStatement = `
         import {${interfaceName}} from './${iconsFolderName}/${modelFileName}';
-        export type IconNameSubset<T extends Readonly<${interfaceName}[]>> = T[number]['name'];
+        export type ${interfaceName}NameSubset<T extends Readonly<${interfaceName}[]>> = T[number]['name'];
        `;
 
       const generatedStatement = generateTypeHelperWithImport(interfaceName, iconsFolderName, modelFileName);

src/lib/generators/code-snippet-generators.ts

@@ -89,7 +89,7 @@ export const generateVariableName = (prefix: string, filenameWithoutEnding): str
 };
 
 export const generateTypeHelper = (interfaceName: string): string => `
-    export type IconNameSubset<T extends Readonly<${interfaceName}[]>> = T[number]['name'];
+    export type ${interfaceName}NameSubset<T extends Readonly<${interfaceName}[]>> = T[number]['name'];
     `;
 
 export const generateTypeHelperWithImport = (