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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.import { types } from "./_db.ts";
/** * Returns the media type associated with the file extension. Values are * normalized to lower case and matched irrespective of a leading `.`. * * When `extension` has no associated type, the function returns `undefined`. * * @example * ```ts * import { typeByExtension } from "https://deno.land/std@$STD_VERSION/media_types/type_by_extension.ts"; * * typeByExtension("js"); // `application/json` * typeByExtension(".HTML"); // `text/html` * typeByExtension("foo"); // undefined * typeByExtension("file.json"); // undefined * ``` */export function typeByExtension(extension: string): string | undefined {  extension = extension.startsWith(".") ? extension.slice(1) : extension;  // @ts-ignore workaround around denoland/dnt#148  return types.get(extension.toLowerCase());}