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// Copyright 2019-2020 Yusuke Sakurai. All rights reserved. MIT license.const kBasicContentTypes: [string, string][] = [  [".html", "text/html"],  [".md", "text/markdown"],  [".txt", "text/plain"],  [".css", "text/css"],  [".jpg", "image/jpeg"],  [".jpeg", "image/jpeg"],  [".png", "image/png"],  [".gif", "image/gif"],  [".pdf", "application/pdf"],  [".zip", "application/zip"],  [".svg", "image/svg+xml"],  [".webp", "image/webp"],  [".js", "application/javascript"],  [".mjs", "application/javascript"],  [".jsx", "application/javascript"],  [".ts", "application/javascript"],  [".tsx", "application/javascript"],  [".json", "application/json"],];
const typeByExt: Map<string, string> = kBasicContentTypes.reduce(  (map, [e, t]) => map.set(e, t),  new Map(),);const extByType: Map<string, string> = kBasicContentTypes.reduce(  (map, [e, t]) => map.set(t, e),  new Map(),);
export function contentTypeByExt(extWithDot: string): string | undefined {  return typeByExt.get(extWithDot);}
export function extByContentType(contentType: string): string | undefined {  return extByType.get(contentType);}