Refactor(icons): Create shared filter function for SVG build scripts

See lmc-eu/spirit-design-system@03b0e0d.

packages/icons/scripts/buildConstants.js

@@ -2,13 +2,14 @@ const fs = require('fs');
 const path = require('path');
 // eslint-disable-next-line import/no-extraneous-dependencies
 const jsdom = require('jsdom');
+const { filterSvgFiles } = require('./shared');
 
 const svgSrcDir = path.resolve(__dirname, `../dist/svg`);
 const distFile = path.resolve(__dirname, `../dist/icons.js`);
 
 const buildContants = (srcDir, file) => {
   fs.readdir(srcDir, (err, files) => {
-    const svgs = files.filter((el) => path.extname(el) === '.svg');
+    const svgs = filterSvgFiles(files);
 
     if (svgs.length > 0) {
       const icons = {};

packages/icons/scripts/buildSvg.js

@@ -1,13 +1,13 @@
 const fs = require('fs');
 const path = require('path');
+const { filterSvgFiles } = require('./shared');
 
 const svgSrcDir = path.resolve(__dirname, `../src/svg`);
 const svgDistDir = path.resolve(__dirname, `../dist/svg`);
 
 const normalizeAndCopySvg = (srcDir, distDir) => {
   fs.readdir(srcDir, (err, files) => {
-    if (files?.length > 0) {
-      const svgs = files.filter((el) => path.extname(el) === '.svg');
+    const svgs = filterSvgFiles(files);
 
       if (svgs.length > 0) {
         let sprite = '<svg xmlns="http://www.w3.org/2000/svg" style="display: none;">\n';

packages/icons/scripts/shared.js

@@ -0,0 +1,8 @@
+const path = require('path');
+
+const filterSvgFiles = (fileNames) =>
+  fileNames.filter((fileName) => path.extname(fileName) === '.svg' && fileName !== 'sprite.svg');
+
+module.exports = {
+  filterSvgFiles,
+};