refactor(deps): use external module

Author: TomokiMiyauci

_tools/meta.ts

@@ -98,5 +98,15 @@ export const makeOptions = (version: string): BuildOptions => ({
       name: "@httpland/accept-ranges-parser",
       version: "1.0.0",
     },
+    "https://deno.land/x/prelude_js@1.0.0/trim.ts": {
+      name: "@miyauci/prelude",
+      version: "1.0.0",
+      subPath: "trim",
+    },
+    "https://deno.land/x/prelude_js@1.0.0/to_lower_case.ts": {
+      name: "@miyauci/prelude",
+      version: "1.0.0",
+      subPath: "to_lower_case",
+    },
   },
 });

deps.ts

@@ -14,6 +14,7 @@ export { isNumber } from "https://deno.land/x/isx@1.1.1/is_number.ts";
 export { isNegativeNumber } from "https://deno.land/x/isx@1.1.1/number/is_negative_number.ts";
 export { isValidDate } from "https://deno.land/x/isx@1.1.1/date/is_valid_date.ts";
 export { trim } from "https://deno.land/x/prelude_js@1.0.0/trim.ts";
+export { toLowerCase } from "https://deno.land/x/prelude_js@1.0.0/to_lower_case.ts";
 export {
   type Handler,
   type Middleware,

utils.ts

@@ -17,6 +17,7 @@ import {
   Status,
   SuccessfulStatus,
   type Token,
+  toLowerCase,
 } from "./deps.ts";
 import type { Precondition } from "./types.ts";
 
@@ -102,7 +103,7 @@ export function withoutConditionHeaders(
   additionalConditionHeaders: readonly string[] = [],
 ): Headers {
   additionalConditionHeaders = distinct(additionalConditionHeaders)
-    .map((v) => v.toLowerCase());
+    .map(toLowerCase);
 
   function isBannedHeader(key: string): boolean {
     return isConditionalHeader(key) ||