chore: Add some array utils (#582)

src/cli/cli-utils.ts

@@ -1,5 +1,6 @@
 import { CAC, Command } from 'cac';
 import consola, { LogLevels } from 'consola';
+import { filterTruthy, toArray } from '~/core/utils/arrays';
 import { printHeader } from '~/core/utils/log';
 import { formatDuration } from '~/core/utils/time';
 import { ValidationError } from '~/core/utils/validation';
@@ -56,8 +57,8 @@ export function getArrayFromFlags<T>(
   flags: any,
   name: string,
 ): T[] | undefined {
-  const array = [flags[name]].flat() as Array<T | undefined>;
-  const result = array.filter((item) => item != null) as T[];
+  const array = toArray<T | undefined>(flags[name]);
+  const result = filterTruthy(array);
   return result.length ? result : undefined;
 }
 

src/core/utils/arrays.ts

@@ -21,3 +21,14 @@ export function some<T>(
     if (predicate(array[i], i)) return true;
   return false;
 }
+
+/**
+ * Convert an item or array to an array.
+ */
+export function toArray<T>(a: T | T[]): T[] {
+  return Array.isArray(a) ? a : [a];
+}
+
+export function filterTruthy<T>(array: Array<T | undefined>): T[] {
+  return array.filter((item) => !!item) as T[];
+}

src/core/utils/building/build-entrypoints.ts

@@ -5,6 +5,7 @@ import { dirname, resolve } from 'path';
 import type { Ora } from 'ora';
 import pc from 'picocolors';
 import { wxt } from '../../wxt';
+import { toArray } from '../arrays';
 
 export async function buildEntrypoints(
   groups: EntrypointGroup[],
@@ -13,7 +14,7 @@ export async function buildEntrypoints(
   const steps: BuildStepOutput[] = [];
   for (let i = 0; i < groups.length; i++) {
     const group = groups[i];
-    const groupNames = [group].flat().map((e) => e.name);
+    const groupNames = toArray(group).map((e) => e.name);
     const groupNameColored = groupNames.join(pc.dim(', '));
     spinner.text =
       pc.dim(`[${i + 1}/${groups.length}]`) + ` ${groupNameColored}`;

src/storage.ts

@@ -8,6 +8,7 @@
 import { Storage, browser } from '~/browser';
 import { dequal } from 'dequal/lite';
 import { logger } from './sandbox/utils/logger';
+import { toArray } from './core/utils/arrays';
 
 export const storage = createStorage();
 
@@ -107,7 +108,7 @@ function createStorage(): WxtStorage {
       await driver.removeItem(metaKey);
     } else {
       const newFields = getMetaValue(await driver.getItem(metaKey));
-      [properties].flat().forEach((field) => delete newFields[field]);
+      toArray(properties).forEach((field) => delete newFields[field]);
       await driver.setItem(metaKey, newFields);
     }
   };