Refactor glob.js

Added function `importGlob()` to enclose operations and improve error handling.

build/utils/glob.js

@@ -12,6 +12,9 @@
 
 import { promisify } from 'node:util';
 
+/**
+ * @type {string[]} A list of packages to attempt import.
+ */
 const candidates = [
     'tiny-glob',
     'globby',
@@ -19,12 +22,24 @@ const candidates = [
     'glob',
 ];
 
-var glob, module;
+export default await importGlob();
+
+/**
+ * Imports the first available glob function.
+ *
+ * @throws {TypeError} If no glob library was found.
+ * @return {function}
+ */
+async function importGlob() {
+    let glob, module;
 
     for (let name of candidates) {
         try {
             module = await import(name);
-        module = module.default;
+
+            if (typeof module.default !== 'function') {
+                throw new TypeError(`Expected ${name} to be a function`);
+            }
 
             /**
              * Wrap the function to ensure
@@ -32,34 +47,26 @@ for (let name of candidates) {
              */
             switch (name) {
                 case 'tiny-glob':
-                glob = createArrayableGlob(module, {
+                    return createArrayableGlob(module.default, {
                         filesOnly: true
                     });
-                break;
 
                 case 'glob':
-                glob = promisify(module);
-                break;
+                    return promisify(module.default);
 
                 default:
-                glob = module;
-                break;
+                    return module.default;
             }
-
-        break; // loop
         } catch (err) {
             // swallow this error; skip to the next candidate.
         }
     }
 
-if (!glob) {
     throw new TypeError(
         `No glob library was found, expected one of: ${modules.join(', ')}`
     );
 }
 
-export default glob;
-
 /**
  * Creates a wrapper function for the glob function
  * to provide support for arrays of patterns.