Implemented plugin to provide constants to SCSS through custom function

.vite/plugins/scss-read-env-variable-function.js

@@ -0,0 +1,46 @@
+import { SassString, Value } from "sass";
+
+/**
+ * @return {import('vite').Plugin}
+ */
+export function ScssViteReadEnvVariableFunctionPlugin() {
+  return {
+    name: 'koloml:scss-read-env-variable-function',
+    apply: 'build',
+    enforce: 'post',
+
+    configResolved: config => {
+      config.css.preprocessorOptions ??= {};
+      config.css.preprocessorOptions.scss ??= {};
+      config.css.preprocessorOptions.scss.functions ??= {};
+
+      /**
+       * @param {Value[]} args
+       * @return {SassString}
+       */
+      config.css.preprocessorOptions.scss.functions['vite-read-env-variable($constant-name)'] = (args) => {
+        const constName = args[0].assertString('constant-name').text;
+
+        if (config.define && config.define.hasOwnProperty(constName)) {
+          let returnedValue = config.define[constName];
+
+          try {
+            returnedValue = JSON.parse(returnedValue);
+          } catch {
+            returnedValue = null;
+          }
+
+          if (typeof returnedValue !== 'string') {
+            console.warn(`Attempting to read the constant with non-string type: ${constName}`);
+            return new SassString('');
+          }
+
+          return new SassString(returnedValue);
+        }
+
+        console.warn(`Constant does not exist: ${constName}`);
+        return new SassString('');
+      }
+    }
+  }
+}