update

__tests__/unit/utils/slug.test.ts

@@ -0,0 +1,22 @@
+import { expect, test } from "vitest";
+import { sluggize } from "../../../src/utils/slug";
+
+test('should sluggize from string array - without prefix and fallback option', () => {
+  expect(sluggize(['foo', 'bar'])).toEqual('/foo/bar');
+});
+
+test('should sluggize from number array - without prefix and fallback option', () => {
+  expect(sluggize([1, 2])).toEqual('/1/2');
+});
+
+test('should sluggize from array - without fallback option', () => {
+  expect(sluggize(['foo', 'bar'], '_prefix')).toEqual('/_prefix/foo/bar');
+});
+
+test('should sluggize returns fallback (undefined) if slug can not convert to array', () => {
+  expect(sluggize({'hoge': 'piyo'}, '_prefix')).toEqual(undefined);
+});
+
+test('should sluggize returns fallback string if slug can not convert to array', () => {
+  expect(sluggize({'hoge': 'piyo'}, '_prefix', 'fallback_str')).toEqual('fallback_str');
+});

src/utils/slug.ts

@@ -0,0 +1,20 @@
+export function sluggize(
+    slug: any,  // NOTE: Next.js request context is any.
+    prefix: string | undefined = undefined,
+    fallback: string | undefined = undefined
+  ) {
+    try {
+      console.log()
+      if (slug instanceof Array) {
+        const p = prefix === undefined ? undefined : '/' + prefix;
+        const s = slug as Array<string>;
+        const arr = [p].concat(s);
+        return arr.join('/');
+       } else {
+        return fallback;
+      }
+    } catch {
+      return fallback;
+    }
+}
+