chore: build script persists optimized SVGs

scripts/build.ts

@@ -32,8 +32,17 @@ async function build(rootDir: string) {
     await createCheatsheet(version, rootDir, distDir, svgSymbolsContent, srcSvgData);
 
     await createWebTypes(version, rootDir, distDir, srcSvgData);
-
-    await copyToTesting(rootDir, distDir, srcSvgData);
+
+    await Promise.all([
+      await copyToTesting(rootDir, distDir, srcSvgData),
+      /**
+       * Writes the optimized SVGs back to its source directory. This directory is where
+       * SVGs are pulled from when previewing Ionicons in the Stencil dev server. 
+       * As a result, we want to ensure that what we are testing is that same as
+       * what users will see in production.
+       */
+      await writeSVGData(srcSvgDir, srcSvgData)
+    ]);
   } catch (e) {
     console.error(e);
     process.exit(1);
@@ -192,18 +201,27 @@ async function optimizeSvg(
   await fs.writeFile(svgData.distSvgFilePath, sourceSvg.data);
 }
 
+/**
+ * Writes SVG data to a directory.
+ * @param distDir - The directory to write the SVG files
+ * @param svgData - An array of SVG data to write
+ */
+async function writeSVGData(distDir: string, svgData: SvgData[]) {
+  await Promise.all(
+    svgData.map(async (svgData) => {      
+      const outPath = join(distDir, svgData.fileName);
+      await fs.writeFile(outPath, svgData.optimizedSvgContent);
+    }),
+  );
+}
+
 async function copyToTesting(rootDir: string, distDir: string, srcSvgData: SvgData[]) {
   const testDir = join(rootDir, 'www');
   const testBuildDir = join(testDir, 'build');
   const testSvgDir = join(testBuildDir, 'svg');
   await fs.ensureDir(testSvgDir);
-
-  await Promise.all(
-    srcSvgData.map(async (svgData) => {
-      const testSvgFilePath = join(testSvgDir, svgData.fileName);
-      await fs.writeFile(testSvgFilePath, svgData.optimizedSvgContent);
-    }),
-  );
+
+  await writeSVGData(testSvgDir, srcSvgData);
 
   const distCheatsheetFilePath = join(distDir, 'cheatsheet.html');
   const testCheatsheetFilePath = join(testDir, 'cheatsheet.html');