@mjackson/file-storage
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Key/value storage for JavaScript File objects
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{
"version": 3,
"sources": ["../src/local.ts", "../src/lib/local-file-storage.ts", "../../lazy-file/src/fs.ts", "../../../node_modules/.pnpm/mrmime@2.0.0/node_modules/mrmime/index.mjs", "../../lazy-file/src/lib/byte-range.ts", "../../lazy-file/src/lib/lazy-file.ts"],
"sourcesContent": ["export { LocalFileStorage } from './lib/local-file-storage.ts';\n", "import * as fs from 'node:fs';\nimport * as fsp from 'node:fs/promises';\nimport * as path from 'node:path';\nimport { openFile, writeFile } from '@mjackson/lazy-file/fs';\n\nimport type { FileStorage, FileMetadata, ListOptions, ListResult } from './file-storage.ts';\n\ntype MetadataJson = Omit<FileMetadata, 'size'>;\n\n/**\n * A `FileStorage` that is backed by a directory on the local filesystem.\n *\n * Important: No attempt is made to avoid overwriting existing files, so the directory used should\n * be a new directory solely dedicated to this storage object.\n *\n * Note: Keys have no correlation to file names on disk, so they may be any string including\n * characters that are not valid in file names. Additionally, individual `File` names have no\n * correlation to names of files on disk, so multiple files with the same name may be stored in the\n * same storage object.\n */\nexport class LocalFileStorage implements FileStorage {\n #dirname: string;\n\n /**\n * @param directory The directory where files are stored\n */\n constructor(directory: string) {\n this.#dirname = path.resolve(directory);\n\n try {\n let stats = fs.statSync(this.#dirname);\n\n if (!stats.isDirectory()) {\n throw new Error(`Path \"${this.#dirname}\" is not a directory`);\n }\n } catch (error) {\n if (!isNoEntityError(error)) {\n throw error;\n }\n\n fs.mkdirSync(this.#dirname, { recursive: true });\n }\n }\n\n async get(key: string): Promise<File | null> {\n let { filePath, metaPath } = await this.#getPaths(key);\n\n try {\n let meta = await readMetadata(metaPath);\n\n return openFile(filePath, {\n lastModified: meta.lastModified,\n name: meta.name,\n type: meta.type,\n });\n } catch (error) {\n if (!isNoEntityError(error)) {\n throw error;\n }\n\n return null;\n }\n }\n\n async has(key: string): Promise<boolean> {\n let { metaPath } = await this.#getPaths(key);\n\n try {\n await fsp.access(metaPath);\n return true;\n } catch {\n return false;\n }\n }\n\n async list<T extends ListOptions>(options?: T): Promise<ListResult<T>> {\n let { cursor, includeMetadata = false, limit = 32, prefix } = options ?? {};\n\n let files: any[] = [];\n let foundCursor = cursor === undefined;\n let nextCursor: string | undefined;\n let lastHash: string | undefined;\n\n outerLoop: for await (let subdir of await fsp.opendir(this.#dirname)) {\n if (!subdir.isDirectory()) continue;\n\n for await (let file of await fsp.opendir(path.join(this.#dirname, subdir.name))) {\n if (!file.isFile() || !file.name.endsWith('.meta.json')) continue;\n\n let hash = file.name.slice(0, -10); // Remove \".meta.json\"\n\n if (foundCursor) {\n let meta = await readMetadata(path.join(this.#dirname, subdir.name, file.name));\n\n if (prefix != null && !meta.key.startsWith(prefix)) {\n continue;\n }\n\n if (files.length >= limit) {\n nextCursor = lastHash;\n break outerLoop;\n }\n\n if (includeMetadata) {\n let size = (await fsp.stat(path.join(this.#dirname, subdir.name, `${hash}.dat`))).size;\n files.push({ ...meta, size });\n } else {\n files.push({ key: meta.key });\n }\n } else if (hash === cursor) {\n foundCursor = true;\n }\n\n lastHash = hash;\n }\n }\n\n return {\n cursor: nextCursor,\n files,\n };\n }\n\n async put(key: string, file: File): Promise<File> {\n await this.set(key, file);\n return (await this.get(key))!;\n }\n\n async remove(key: string): Promise<void> {\n let { filePath, metaPath } = await this.#getPaths(key);\n\n try {\n await Promise.all([fsp.unlink(filePath), fsp.unlink(metaPath)]);\n } catch (error) {\n if (!isNoEntityError(error)) {\n throw error;\n }\n }\n }\n\n async set(key: string, file: File): Promise<void> {\n let { directory, filePath, metaPath } = await this.#getPaths(key);\n\n // Ensure directory exists\n await fsp.mkdir(directory, { recursive: true });\n\n await writeFile(filePath, file);\n\n let meta: MetadataJson = {\n key,\n lastModified: file.lastModified,\n name: file.name,\n type: file.type,\n };\n await fsp.writeFile(metaPath, JSON.stringify(meta));\n }\n\n async #getPaths(key: string): Promise<{ directory: string; filePath: string; metaPath: string }> {\n let hash = await computeHash(key);\n let directory = path.join(this.#dirname, hash.slice(0, 2));\n\n return {\n directory,\n filePath: path.join(directory, `${hash}.dat`),\n metaPath: path.join(directory, `${hash}.meta.json`),\n };\n }\n}\n\nasync function readMetadata(metaPath: string): Promise<MetadataJson> {\n return JSON.parse(await fsp.readFile(metaPath, 'utf-8'));\n}\n\nasync function computeHash(key: string, algorithm = 'SHA-256'): Promise<string> {\n let digest = await crypto.subtle.digest(algorithm, new TextEncoder().encode(key));\n return Array.from(new Uint8Array(digest))\n .map((b) => b.toString(16).padStart(2, '0'))\n .join('');\n}\n\nfunction isNoEntityError(obj: unknown): obj is NodeJS.ErrnoException & { code: 'ENOENT' } {\n return obj instanceof Error && 'code' in obj && (obj as NodeJS.ErrnoException).code === 'ENOENT';\n}\n", "import * as fs from 'node:fs';\nimport * as path from 'node:path';\nimport { lookup } from 'mrmime';\n\nimport { type LazyContent, LazyFile } from './lib/lazy-file.ts';\n\nexport interface OpenFileOptions {\n /**\n * Overrides the name of the file. Default is the name of the file on disk.\n */\n name?: string;\n /**\n * Overrides the MIME type of the file. Default is determined by the file extension.\n */\n type?: string;\n /**\n * Overrides the last modified timestamp of the file. Default is the file's last modified time.\n */\n lastModified?: number;\n}\n\n/**\n * Returns a `File` from the local filesytem.\n *\n * [MDN `File` Reference](https://developer.mozilla.org/en-US/docs/Web/API/File)\n *\n * @param filename The path to the file\n * @param options Options to override the file's metadata\n * @returns A `File` object\n */\nexport function openFile(filename: string, options?: OpenFileOptions): File {\n let stats = fs.statSync(filename);\n\n if (!stats.isFile()) {\n throw new Error(`Path \"${filename}\" is not a file`);\n }\n\n let content: LazyContent = {\n byteLength: stats.size,\n stream(start, end) {\n return streamFile(filename, start, end);\n },\n };\n\n return new LazyFile(content, options?.name ?? path.basename(filename), {\n type: options?.type ?? lookup(filename),\n lastModified: options?.lastModified ?? stats.mtimeMs,\n });\n}\n\nfunction streamFile(filename: string, start = 0, end = Infinity): ReadableStream<Uint8Array> {\n let read = fs.createReadStream(filename, { start, end: end - 1 }).iterator();\n\n return new ReadableStream({\n async pull(controller) {\n let { done, value } = await read.next();\n\n if (done) {\n controller.close();\n } else {\n controller.enqueue(new Uint8Array(value.buffer, value.byteOffset, value.byteLength));\n }\n },\n });\n}\n\n// Preserve backwards compat with v3.0\nexport { type OpenFileOptions as GetFileOptions, openFile as getFile };\n\n/**\n * Writes a `File` to the local filesytem and resolves when the stream is finished.\n *\n * [MDN `File` Reference](https://developer.mozilla.org/en-US/docs/Web/API/File)\n *\n * @param to The path to write the file to, or an open file descriptor\n * @param file The file to write\n * @returns A promise that resolves when the file is written\n */\nexport function writeFile(to: string | number | fs.promises.FileHandle, file: File): Promise<void> {\n return new Promise(async (resolve, reject) => {\n let writeStream =\n typeof to === 'string'\n ? fs.createWriteStream(to)\n : fs.createWriteStream('ignored', { fd: to });\n\n try {\n for await (let chunk of file.stream()) {\n writeStream.write(chunk);\n }\n\n writeStream.end(() => {\n resolve();\n });\n } catch (error) {\n writeStream.end(() => {\n reject(error);\n });\n }\n });\n}\n", "const mimes = {\n \"3g2\": \"video/3gpp2\",\n \"3gp\": \"video/3gpp\",\n \"3gpp\": \"video/3gpp\",\n \"3mf\": \"model/3mf\",\n \"aac\": \"audio/aac\",\n \"ac\": \"application/pkix-attr-cert\",\n \"adp\": \"audio/adpcm\",\n \"adts\": \"audio/aac\",\n \"ai\": \"application/postscript\",\n \"aml\": \"application/automationml-aml+xml\",\n \"amlx\": \"application/automationml-amlx+zip\",\n \"amr\": \"audio/amr\",\n \"apng\": \"image/apng\",\n \"appcache\": \"text/cache-manifest\",\n \"appinstaller\": \"application/appinstaller\",\n \"appx\": \"application/appx\",\n \"appxbundle\": \"application/appxbundle\",\n \"asc\": \"application/pgp-keys\",\n \"atom\": \"application/atom+xml\",\n \"atomcat\": \"application/atomcat+xml\",\n \"atomdeleted\": \"application/atomdeleted+xml\",\n \"atomsvc\": \"application/atomsvc+xml\",\n \"au\": \"audio/basic\",\n \"avci\": \"image/avci\",\n \"avcs\": \"image/avcs\",\n \"avif\": \"image/avif\",\n \"aw\": \"application/applixware\",\n \"bdoc\": \"application/bdoc\",\n \"bin\": \"application/octet-stream\",\n \"bmp\": \"image/bmp\",\n \"bpk\": \"application/octet-stream\",\n \"btf\": \"image/prs.btif\",\n \"btif\": \"image/prs.btif\",\n \"buffer\": \"application/octet-stream\",\n \"ccxml\": \"application/ccxml+xml\",\n \"cdfx\": \"application/cdfx+xml\",\n \"cdmia\": \"application/cdmi-capability\",\n \"cdmic\": \"application/cdmi-container\",\n \"cdmid\": \"application/cdmi-domain\",\n \"cdmio\": \"application/cdmi-object\",\n \"cdmiq\": \"application/cdmi-queue\",\n \"cer\": \"application/pkix-cert\",\n \"cgm\": \"image/cgm\",\n \"cjs\": \"application/node\",\n \"class\": \"application/java-vm\",\n \"coffee\": \"text/coffeescript\",\n \"conf\": \"text/plain\",\n \"cpl\": \"application/cpl+xml\",\n \"cpt\": \"application/mac-compactpro\",\n \"crl\": \"application/pkix-crl\",\n \"css\": \"text/css\",\n \"csv\": \"text/csv\",\n \"cu\": \"application/cu-seeme\",\n \"cwl\": \"application/cwl\",\n \"cww\": \"application/prs.cww\",\n \"davmount\": \"application/davmount+xml\",\n \"dbk\": \"application/docbook+xml\",\n \"deb\": \"application/octet-stream\",\n \"def\": \"text/plain\",\n \"deploy\": \"application/octet-stream\",\n \"dib\": \"image/bmp\",\n \"disposition-notification\": \"message/disposition-notification\",\n \"dist\": \"application/octet-stream\",\n \"distz\": \"application/octet-stream\",\n \"dll\": \"application/octet-stream\",\n \"dmg\": \"application/octet-stream\",\n \"dms\": \"application/octet-stream\",\n \"doc\": \"application/msword\",\n \"dot\": \"application/msword\",\n \"dpx\": \"image/dpx\",\n \"drle\": \"image/dicom-rle\",\n \"dsc\": \"text/prs.lines.tag\",\n \"dssc\": \"application/dssc+der\",\n \"dtd\": \"application/xml-dtd\",\n \"dump\": \"application/octet-stream\",\n \"dwd\": \"application/atsc-dwd+xml\",\n \"ear\": \"application/java-archive\",\n \"ecma\": \"application/ecmascript\",\n \"elc\": \"application/octet-stream\",\n \"emf\": \"image/emf\",\n \"eml\": \"message/rfc822\",\n \"emma\": \"application/emma+xml\",\n \"emotionml\": \"application/emotionml+xml\",\n \"eps\": \"application/postscript\",\n \"epub\": \"application/epub+zip\",\n \"exe\": \"application/octet-stream\",\n \"exi\": \"application/exi\",\n \"exp\": \"application/express\",\n \"exr\": \"image/aces\",\n \"ez\": \"application/andrew-inset\",\n \"fdf\": \"application/fdf\",\n \"fdt\": \"application/fdt+xml\",\n \"fits\": \"image/fits\",\n \"g3\": \"image/g3fax\",\n \"gbr\": \"application/rpki-ghostbusters\",\n \"geojson\": \"application/geo+json\",\n \"gif\": \"image/gif\",\n \"glb\": \"model/gltf-binary\",\n \"gltf\": \"model/gltf+json\",\n \"gml\": \"application/gml+xml\",\n \"gpx\": \"application/gpx+xml\",\n \"gram\": \"application/srgs\",\n \"grxml\": \"application/srgs+xml\",\n \"gxf\": \"application/gxf\",\n \"gz\": \"application/gzip\",\n \"h261\": \"video/h261\",\n \"h263\": \"video/h263\",\n \"h264\": \"video/h264\",\n \"heic\": \"image/heic\",\n \"heics\": \"image/heic-sequence\",\n \"heif\": \"image/heif\",\n \"heifs\": \"image/heif-sequence\",\n \"hej2\": \"image/hej2k\",\n \"held\": \"application/atsc-held+xml\",\n \"hjson\": \"application/hjson\",\n \"hlp\": \"application/winhlp\",\n \"hqx\": \"application/mac-binhex40\",\n \"hsj2\": \"image/hsj2\",\n \"htm\": \"text/html\",\n \"html\": \"text/html\",\n \"ics\": \"text/calendar\",\n \"ief\": \"image/ief\",\n \"ifb\": \"text/calendar\",\n \"iges\": \"model/iges\",\n \"igs\": \"model/iges\",\n \"img\": \"application/octet-stream\",\n \"in\": \"text/plain\",\n \"ini\": \"text/plain\",\n \"ink\": \"application/inkml+xml\",\n \"inkml\": \"application/inkml+xml\",\n \"ipfix\": \"application/ipfix\",\n \"iso\": \"application/octet-stream\",\n \"its\": \"application/its+xml\",\n \"jade\": \"text/jade\",\n \"jar\": \"application/java-archive\",\n \"jhc\": \"image/jphc\",\n \"jls\": \"image/jls\",\n \"jp2\": \"image/jp2\",\n \"jpe\": \"image/jpeg\",\n \"jpeg\": \"image/jpeg\",\n \"jpf\": \"image/jpx\",\n \"jpg\": \"image/jpeg\",\n \"jpg2\": \"image/jp2\",\n \"jpgm\": \"image/jpm\",\n \"jpgv\": \"video/jpeg\",\n \"jph\": \"image/jph\",\n \"jpm\": \"image/jpm\",\n \"jpx\": \"image/jpx\",\n \"js\": \"text/javascript\",\n \"json\": \"application/json\",\n \"json5\": \"application/json5\",\n \"jsonld\": \"application/ld+json\",\n \"jsonml\": \"application/jsonml+json\",\n \"jsx\": \"text/jsx\",\n \"jt\": \"model/jt\",\n \"jxr\": \"image/jxr\",\n \"jxra\": \"image/jxra\",\n \"jxrs\": \"image/jxrs\",\n \"jxs\": \"image/jxs\",\n \"jxsc\": \"image/jxsc\",\n \"jxsi\": \"image/jxsi\",\n \"jxss\": \"image/jxss\",\n \"kar\": \"audio/midi\",\n \"ktx\": \"image/ktx\",\n \"ktx2\": \"image/ktx2\",\n \"less\": \"text/less\",\n \"lgr\": \"application/lgr+xml\",\n \"list\": \"text/plain\",\n \"litcoffee\": \"text/coffeescript\",\n \"log\": \"text/plain\",\n \"lostxml\": \"application/lost+xml\",\n \"lrf\": \"application/octet-stream\",\n \"m1v\": \"video/mpeg\",\n \"m21\": \"application/mp21\",\n \"m2a\": \"audio/mpeg\",\n \"m2v\": \"video/mpeg\",\n \"m3a\": \"audio/mpeg\",\n \"m4a\": \"audio/mp4\",\n \"m4p\": \"application/mp4\",\n \"m4s\": \"video/iso.segment\",\n \"ma\": \"application/mathematica\",\n \"mads\": \"application/mads+xml\",\n \"maei\": \"application/mmt-aei+xml\",\n \"man\": \"text/troff\",\n \"manifest\": \"text/cache-manifest\",\n \"map\": \"application/json\",\n \"mar\": \"application/octet-stream\",\n \"markdown\": \"text/markdown\",\n \"mathml\": \"application/mathml+xml\",\n \"mb\": \"application/mathematica\",\n \"mbox\": \"application/mbox\",\n \"md\": \"text/markdown\",\n \"mdx\": \"text/mdx\",\n \"me\": \"text/troff\",\n \"mesh\": \"model/mesh\",\n \"meta4\": \"application/metalink4+xml\",\n \"metalink\": \"application/metalink+xml\",\n \"mets\": \"application/mets+xml\",\n \"mft\": \"application/rpki-manifest\",\n \"mid\": \"audio/midi\",\n \"midi\": \"audio/midi\",\n \"mime\": \"message/rfc822\",\n \"mj2\": \"video/mj2\",\n \"mjp2\": \"video/mj2\",\n \"mjs\": \"text/javascript\",\n \"mml\": \"text/mathml\",\n \"mods\": \"application/mods+xml\",\n \"mov\": \"video/quicktime\",\n \"mp2\": \"audio/mpeg\",\n \"mp21\": \"application/mp21\",\n \"mp2a\": \"audio/mpeg\",\n \"mp3\": \"audio/mpeg\",\n \"mp4\": \"video/mp4\",\n \"mp4a\": \"audio/mp4\",\n \"mp4s\": \"application/mp4\",\n \"mp4v\": \"video/mp4\",\n \"mpd\": \"application/dash+xml\",\n \"mpe\": \"video/mpeg\",\n \"mpeg\": \"video/mpeg\",\n \"mpf\": \"application/media-policy-dataset+xml\",\n \"mpg\": \"video/mpeg\",\n \"mpg4\": \"video/mp4\",\n \"mpga\": \"audio/mpeg\",\n \"mpp\": \"application/dash-patch+xml\",\n \"mrc\": \"application/marc\",\n \"mrcx\": \"application/marcxml+xml\",\n \"ms\": \"text/troff\",\n \"mscml\": \"application/mediaservercontrol+xml\",\n \"msh\": \"model/mesh\",\n \"msi\": \"application/octet-stream\",\n \"msix\": \"application/msix\",\n \"msixbundle\": \"application/msixbundle\",\n \"msm\": \"application/octet-stream\",\n \"msp\": \"application/octet-stream\",\n \"mtl\": \"model/mtl\",\n \"musd\": \"application/mmt-usd+xml\",\n \"mxf\": \"application/mxf\",\n \"mxmf\": \"audio/mobile-xmf\",\n \"mxml\": \"application/xv+xml\",\n \"n3\": \"text/n3\",\n \"nb\": \"application/mathematica\",\n \"nq\": \"application/n-quads\",\n \"nt\": \"application/n-triples\",\n \"obj\": \"model/obj\",\n \"oda\": \"application/oda\",\n \"oga\": \"audio/ogg\",\n \"ogg\": \"audio/ogg\",\n \"ogv\": \"video/ogg\",\n \"ogx\": \"application/ogg\",\n \"omdoc\": \"application/omdoc+xml\",\n \"onepkg\": \"application/onenote\",\n \"onetmp\": \"application/onenote\",\n \"onetoc\": \"application/onenote\",\n \"onetoc2\": \"application/onenote\",\n \"opf\": \"application/oebps-package+xml\",\n \"opus\": \"audio/ogg\",\n \"otf\": \"font/otf\",\n \"owl\": \"application/rdf+xml\",\n \"oxps\": \"application/oxps\",\n \"p10\": \"application/pkcs10\",\n \"p7c\": \"application/pkcs7-mime\",\n \"p7m\": \"application/pkcs7-mime\",\n \"p7s\": \"application/pkcs7-signature\",\n \"p8\": \"application/pkcs8\",\n \"pdf\": \"application/pdf\",\n \"pfr\": \"application/font-tdpfr\",\n \"pgp\": \"application/pgp-encrypted\",\n \"pkg\": \"application/octet-stream\",\n \"pki\": \"application/pkixcmp\",\n \"pkipath\": \"application/pkix-pkipath\",\n \"pls\": \"application/pls+xml\",\n \"png\": \"image/png\",\n \"prc\": \"model/prc\",\n \"prf\": \"application/pics-rules\",\n \"provx\": \"application/provenance+xml\",\n \"ps\": \"application/postscript\",\n \"pskcxml\": \"application/pskc+xml\",\n \"pti\": \"image/prs.pti\",\n \"qt\": \"video/quicktime\",\n \"raml\": \"application/raml+yaml\",\n \"rapd\": \"application/route-apd+xml\",\n \"rdf\": \"application/rdf+xml\",\n \"relo\": \"application/p2p-overlay+xml\",\n \"rif\": \"application/reginfo+xml\",\n \"rl\": \"application/resource-lists+xml\",\n \"rld\": \"application/resource-lists-diff+xml\",\n \"rmi\": \"audio/midi\",\n \"rnc\": \"application/relax-ng-compact-syntax\",\n \"rng\": \"application/xml\",\n \"roa\": \"application/rpki-roa\",\n \"roff\": \"text/troff\",\n \"rq\": \"application/sparql-query\",\n \"rs\": \"application/rls-services+xml\",\n \"rsat\": \"application/atsc-rsat+xml\",\n \"rsd\": \"application/rsd+xml\",\n \"rsheet\": \"application/urc-ressheet+xml\",\n \"rss\": \"application/rss+xml\",\n \"rtf\": \"text/rtf\",\n \"rtx\": \"text/richtext\",\n \"rusd\": \"application/route-usd+xml\",\n \"s3m\": \"audio/s3m\",\n \"sbml\": \"application/sbml+xml\",\n \"scq\": \"application/scvp-cv-request\",\n \"scs\": \"application/scvp-cv-response\",\n \"sdp\": \"application/sdp\",\n \"senmlx\": \"application/senml+xml\",\n \"sensmlx\": \"application/sensml+xml\",\n \"ser\": \"application/java-serialized-object\",\n \"setpay\": \"application/set-payment-initiation\",\n \"setreg\": \"application/set-registration-initiation\",\n \"sgi\": \"image/sgi\",\n \"sgm\": \"text/sgml\",\n \"sgml\": \"text/sgml\",\n \"shex\": \"text/shex\",\n \"shf\": \"application/shf+xml\",\n \"shtml\": \"text/html\",\n \"sieve\": \"application/sieve\",\n \"sig\": \"application/pgp-signature\",\n \"sil\": \"audio/silk\",\n \"silo\": \"model/mesh\",\n \"siv\": \"application/sieve\",\n \"slim\": \"text/slim\",\n \"slm\": \"text/slim\",\n \"sls\": \"application/route-s-tsid+xml\",\n \"smi\": \"application/smil+xml\",\n \"smil\": \"application/smil+xml\",\n \"snd\": \"audio/basic\",\n \"so\": \"application/octet-stream\",\n \"spdx\": \"text/spdx\",\n \"spp\": \"application/scvp-vp-response\",\n \"spq\": \"application/scvp-vp-request\",\n \"spx\": \"audio/ogg\",\n \"sql\": \"application/sql\",\n \"sru\": \"application/sru+xml\",\n \"srx\": \"application/sparql-results+xml\",\n \"ssdl\": \"application/ssdl+xml\",\n \"ssml\": \"application/ssml+xml\",\n \"stk\": \"application/hyperstudio\",\n \"stl\": \"model/stl\",\n \"stpx\": \"model/step+xml\",\n \"stpxz\": \"model/step-xml+zip\",\n \"stpz\": \"model/step+zip\",\n \"styl\": \"text/stylus\",\n \"stylus\": \"text/stylus\",\n \"svg\": \"image/svg+xml\",\n \"svgz\": \"image/svg+xml\",\n \"swidtag\": \"application/swid+xml\",\n \"t\": \"text/troff\",\n \"t38\": \"image/t38\",\n \"td\": \"application/urc-targetdesc+xml\",\n \"tei\": \"application/tei+xml\",\n \"teicorpus\": \"application/tei+xml\",\n \"text\": \"text/plain\",\n \"tfi\": \"application/thraud+xml\",\n \"tfx\": \"image/tiff-fx\",\n \"tif\": \"image/tiff\",\n \"tiff\": \"image/tiff\",\n \"toml\": \"application/toml\",\n \"tr\": \"text/troff\",\n \"trig\": \"application/trig\",\n \"ts\": \"video/mp2t\",\n \"tsd\": \"application/timestamped-data\",\n \"tsv\": \"text/tab-separated-values\",\n \"ttc\": \"font/collection\",\n \"ttf\": \"font/ttf\",\n \"ttl\": \"text/turtle\",\n \"ttml\": \"application/ttml+xml\",\n \"txt\": \"text/plain\",\n \"u3d\": \"model/u3d\",\n \"u8dsn\": \"message/global-delivery-status\",\n \"u8hdr\": \"message/global-headers\",\n \"u8mdn\": \"message/global-disposition-notification\",\n \"u8msg\": \"message/global\",\n \"ubj\": \"application/ubjson\",\n \"uri\": \"text/uri-list\",\n \"uris\": \"text/uri-list\",\n \"urls\": \"text/uri-list\",\n \"vcard\": \"text/vcard\",\n \"vrml\": \"model/vrml\",\n \"vtt\": \"text/vtt\",\n \"vxml\": \"application/voicexml+xml\",\n \"war\": \"application/java-archive\",\n \"wasm\": \"application/wasm\",\n \"wav\": \"audio/wav\",\n \"weba\": \"audio/webm\",\n \"webm\": \"video/webm\",\n \"webmanifest\": \"application/manifest+json\",\n \"webp\": \"image/webp\",\n \"wgsl\": \"text/wgsl\",\n \"wgt\": \"application/widget\",\n \"wif\": \"application/watcherinfo+xml\",\n \"wmf\": \"image/wmf\",\n \"woff\": \"font/woff\",\n \"woff2\": \"font/woff2\",\n \"wrl\": \"model/vrml\",\n \"wsdl\": \"application/wsdl+xml\",\n \"wspolicy\": \"application/wspolicy+xml\",\n \"x3d\": \"model/x3d+xml\",\n \"x3db\": \"model/x3d+fastinfoset\",\n \"x3dbz\": \"model/x3d+binary\",\n \"x3dv\": \"model/x3d-vrml\",\n \"x3dvz\": \"model/x3d+vrml\",\n \"x3dz\": \"model/x3d+xml\",\n \"xaml\": \"application/xaml+xml\",\n \"xav\": \"application/xcap-att+xml\",\n \"xca\": \"application/xcap-caps+xml\",\n \"xcs\": \"application/calendar+xml\",\n \"xdf\": \"application/xcap-diff+xml\",\n \"xdssc\": \"application/dssc+xml\",\n \"xel\": \"application/xcap-el+xml\",\n \"xenc\": \"application/xenc+xml\",\n \"xer\": \"application/patch-ops-error+xml\",\n \"xfdf\": \"application/xfdf\",\n \"xht\": \"application/xhtml+xml\",\n \"xhtml\": \"application/xhtml+xml\",\n \"xhvml\": \"application/xv+xml\",\n \"xlf\": \"application/xliff+xml\",\n \"xm\": \"audio/xm\",\n \"xml\": \"text/xml\",\n \"xns\": \"application/xcap-ns+xml\",\n \"xop\": \"application/xop+xml\",\n \"xpl\": \"application/xproc+xml\",\n \"xsd\": \"application/xml\",\n \"xsf\": \"application/prs.xsf+xml\",\n \"xsl\": \"application/xml\",\n \"xslt\": \"application/xml\",\n \"xspf\": \"application/xspf+xml\",\n \"xvm\": \"application/xv+xml\",\n \"xvml\": \"application/xv+xml\",\n \"yaml\": \"text/yaml\",\n \"yang\": \"application/yang\",\n \"yin\": \"application/yin+xml\",\n \"yml\": \"text/yaml\",\n \"zip\": \"application/zip\"\n};\n\nfunction lookup(extn) {\n\tlet tmp = ('' + extn).trim().toLowerCase();\n\tlet idx = tmp.lastIndexOf('.');\n\treturn mimes[!~idx ? tmp : tmp.substring(++idx)];\n}\n\nexport { mimes, lookup };\n", "export interface ByteRange {\n /**\n * The start index of the range (inclusive). If this number is negative, it represents an offset\n * from the end of the content.\n */\n start: number;\n /**\n * The end index of the range (exclusive). If this number is negative, it represents an offset\n * from the end of the content. `Infinity` represents the end of the content.\n */\n end: number;\n}\n\n/**\n * Returns the length of the byte range in a buffer of the given `size`.\n */\nexport function getByteLength(range: ByteRange, size: number): number {\n let [start, end] = getIndexes(range, size);\n return end - start;\n}\n\n/**\n * Resolves a byte range to absolute indexes in a buffer of the given `size`.\n */\nexport function getIndexes(range: ByteRange, size: number): [number, number] {\n let start = Math.min(Math.max(0, range.start < 0 ? size + range.start : range.start), size);\n let end = Math.min(Math.max(start, range.end < 0 ? size + range.end : range.end), size);\n return [start, end];\n}\n", "import { type ByteRange, getByteLength, getIndexes } from './byte-range.ts';\n\n/**\n * A streaming interface for blob/file content.\n */\nexport interface LazyContent {\n /**\n * The total length of the content.\n */\n byteLength: number;\n /**\n * Returns a stream that can be used to read the content. When given, the `start` index is\n * inclusive indicating the index of the first byte to read. The `end` index is exclusive\n * indicating the index of the first byte not to read.\n */\n stream(start?: number, end?: number): ReadableStream<Uint8Array>;\n}\n\nexport interface LazyBlobOptions {\n /**\n * The range of bytes to include from the content. If not specified, all content is included.\n */\n range?: ByteRange;\n /**\n * The MIME type of the content. The default is an empty string.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/Blob#type)\n */\n type?: string;\n}\n\n/**\n * A [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob) that may be backed by a stream\n * of data. This is useful for working with large blobs that would be impractical to load into\n * memory all at once.\n *\n * This class is an extension of JavaScript's built-in `Blob` class with the following additions:\n *\n * - The constructor may accept a `LazyContent` object instead of a `BlobPart[]` array\n * - The constructor may accept a `range` in the options to specify a subset of the content\n *\n * In normal usage you shouldn't have to specify the `range` yourself. The `slice()` method\n * automatically takes care of creating new `LazyBlob` instances with the correct range.\n *\n * [MDN `Blob` Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob)\n */\nexport class LazyBlob extends Blob {\n readonly #content: BlobContent;\n\n constructor(parts: BlobPart[] | LazyContent, options?: LazyBlobOptions) {\n super([], options);\n this.#content = new BlobContent(parts, options);\n }\n\n /**\n * Returns the blob's contents as an [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer).\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/arrayBuffer)\n */\n async arrayBuffer(): Promise<ArrayBuffer> {\n return this.#content.arrayBuffer();\n }\n\n /**\n * Returns the blob's contents as a byte array.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/bytes)\n */\n async bytes(): Promise<Uint8Array> {\n return this.#content.bytes();\n }\n\n /**\n * The size of the blob in bytes.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/size)\n */\n get size(): number {\n return this.#content.size;\n }\n\n /**\n * Returns a new [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob) that contains the data in the specified range.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/slice)\n */\n slice(start?: number, end?: number, contentType?: string): Blob {\n return this.#content.slice(start, end, contentType);\n }\n\n /**\n * Returns a stream that can be used to read the blob's contents.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/stream)\n */\n stream(): ReadableStream<Uint8Array> {\n return this.#content.stream();\n }\n\n /**\n * Returns the blob's contents as a string.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/text)\n */\n async text(): Promise<string> {\n return this.#content.text();\n }\n}\n\nexport interface LazyFileOptions extends LazyBlobOptions {\n /**\n * The last modified timestamp of the file in milliseconds. Defaults to `Date.now()`.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/File/File#lastmodified)\n */\n lastModified?: number;\n}\n\n/**\n * A [`File`](https://developer.mozilla.org/en-US/docs/Web/API/File) that may be backed by a stream\n * of data. This is useful for working with large files that would be impractical to load into\n * memory all at once.\n *\n * This class is an extension of JavaScript's built-in `File` class with the following additions:\n *\n * - The constructor may accept a `LazyContent` object instead of a `BlobPart[]` array\n * - The constructor may accept a `range` in the options to specify a subset of the content\n *\n * In normal usage you shouldn't have to specify the `range` yourself. The `slice()` method\n * automatically takes care of creating new `LazyBlob` instances with the correct range.\n *\n * [MDN `File` Reference](https://developer.mozilla.org/en-US/docs/Web/API/File)\n */\nexport class LazyFile extends File {\n readonly #content: BlobContent;\n\n constructor(parts: BlobPart[] | LazyContent, name: string, options?: LazyFileOptions) {\n super([], name, options);\n this.#content = new BlobContent(parts, options);\n }\n\n /**\n * Returns the file's content as an [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer).\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/arrayBuffer)\n */\n async arrayBuffer(): Promise<ArrayBuffer> {\n return this.#content.arrayBuffer();\n }\n\n /**\n * Returns the file's contents as a byte array.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/bytes)\n */\n async bytes(): Promise<Uint8Array> {\n return this.#content.bytes();\n }\n\n /**\n * The size of the file in bytes.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/size)\n */\n get size(): number {\n return this.#content.size;\n }\n\n /**\n * Returns a new [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob) that contains the data in the specified range.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/slice)\n */\n slice(start?: number, end?: number, contentType?: string): Blob {\n return this.#content.slice(start, end, contentType);\n }\n\n /**\n * Returns a stream that can be used to read the file's contents.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/stream)\n */\n stream(): ReadableStream<Uint8Array> {\n return this.#content.stream();\n }\n\n /**\n * Returns the file's contents as a string.\n *\n * [MDN Reference](https://developer.mozilla.org/en-US/docs/Web/API/Blob/text)\n */\n async text(): Promise<string> {\n return this.#content.text();\n }\n}\n\nclass BlobContent {\n readonly source: (Blob | Uint8Array)[] | LazyContent;\n readonly totalSize: number;\n readonly range?: ByteRange;\n readonly type: string;\n\n constructor(parts: BlobPart[] | LazyContent, options?: LazyBlobOptions) {\n if (Array.isArray(parts)) {\n this.source = [];\n this.totalSize = 0;\n\n for (let part of parts) {\n if (part instanceof Blob) {\n this.source.push(part);\n this.totalSize += part.size;\n } else {\n let array: Uint8Array;\n if (typeof part === 'string') {\n array = new TextEncoder().encode(part);\n } else if (ArrayBuffer.isView(part)) {\n array = new Uint8Array(part.buffer, part.byteOffset, part.byteLength);\n } else {\n array = new Uint8Array(part);\n }\n\n this.source.push(array);\n this.totalSize += array.byteLength;\n }\n }\n } else {\n this.source = parts;\n this.totalSize = parts.byteLength;\n }\n\n this.range = options?.range;\n this.type = options?.type ?? 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