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std/node/_fs/_fs_readFile.ts

Deno standard library
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { BinaryOptionsArgument, FileOptionsArgument, getEncoding, TextOptionsArgument,} from "./_fs_common.ts";import { Buffer } from "../buffer.ts";import { fromFileUrl } from "../path.ts";import { BinaryEncodings, Encodings, TextEncodings } from "../_utils.ts";
function maybeDecode(data: Uint8Array, encoding: TextEncodings): string;function maybeDecode( data: Uint8Array, encoding: BinaryEncodings | null,): Buffer;function maybeDecode( data: Uint8Array, encoding: Encodings | null,): string | Buffer { const buffer = Buffer.from(data.buffer, data.byteOffset, data.byteLength); if (encoding && encoding !== "binary") return buffer.toString(encoding); return buffer;}
type TextCallback = (err: Error | null, data?: string) => void;type BinaryCallback = (err: Error | null, data?: Buffer) => void;type GenericCallback = (err: Error | null, data?: string | Buffer) => void;type Callback = TextCallback | BinaryCallback | GenericCallback;
export function readFile( path: string | URL, options: TextOptionsArgument, callback: TextCallback,): void;export function readFile( path: string | URL, options: BinaryOptionsArgument, callback: BinaryCallback,): void;export function readFile( path: string | URL, options: null | undefined | FileOptionsArgument, callback: BinaryCallback,): void;export function readFile(path: string | URL, callback: BinaryCallback): void;export function readFile( path: string | URL, optOrCallback?: FileOptionsArgument | Callback | null | undefined, callback?: Callback,): void { path = path instanceof URL ? fromFileUrl(path) : path; let cb: Callback | undefined; if (typeof optOrCallback === "function") { cb = optOrCallback; } else { cb = callback; }
const encoding = getEncoding(optOrCallback);
const p = Deno.readFile(path);
if (cb) { p.then((data: Uint8Array) => { if (encoding && encoding !== "binary") { const text = maybeDecode(data, encoding); return (cb as TextCallback)(null, text); } const buffer = maybeDecode(data, encoding); (cb as BinaryCallback)(null, buffer); }, (err) => cb && cb(err)); }}
export function readFileSync( path: string | URL, opt: TextOptionsArgument,): string;export function readFileSync( path: string | URL, opt?: BinaryOptionsArgument,): Buffer;export function readFileSync( path: string | URL, opt?: FileOptionsArgument,): string | Buffer { path = path instanceof URL ? fromFileUrl(path) : path; const data = Deno.readFileSync(path); const encoding = getEncoding(opt); if (encoding && encoding !== "binary") { const text = maybeDecode(data, encoding); return text; } const buffer = maybeDecode(data, encoding); return buffer;}