feat(std/node): fs.writefile / fs.promises.writeFile (#5054)

1 files changed, 10 insertions, 82 deletions

diff --git a/std/node/_fs/_fs_appendFile.ts b/std/node/_fs/_fs_appendFile.ts
index b116589a0..c0f347dbf 100644
--- a/std/node/_fs/_fs_appendFile.ts
+++ b/std/node/_fs/_fs_appendFile.ts
@@ -1,5 +1,10 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import { FileOptions, isFileOptions, CallbackWithError } from "./_fs_common.ts";
+import {
+  WriteFileOptions,
+  isFileOptions,
+  CallbackWithError,
+  getOpenOptions,
+} from "./_fs_common.ts";
 import { notImplemented } from "../_utils.ts";
 import { fromFileUrl } from "../path.ts";
 
@@ -10,13 +15,13 @@ import { fromFileUrl } from "../path.ts";
 export function appendFile(
   pathOrRid: string | number | URL,
   data: string,
-  optionsOrCallback: string | FileOptions | CallbackWithError,
+  optionsOrCallback: string | WriteFileOptions | CallbackWithError,
   callback?: CallbackWithError
 ): void {
   pathOrRid = pathOrRid instanceof URL ? fromFileUrl(pathOrRid) : pathOrRid;
   const callbackFn: CallbackWithError | undefined =
     optionsOrCallback instanceof Function ? optionsOrCallback : callback;
-  const options: string | FileOptions | undefined =
+  const options: string | WriteFileOptions | undefined =
     optionsOrCallback instanceof Function ? undefined : optionsOrCallback;
   if (!callbackFn) {
     throw new Error("No callback function supplied");
@@ -74,7 +79,7 @@ function closeRidIfNecessary(isPathString: boolean, rid: number): void {
 export function appendFileSync(
   pathOrRid: string | number | URL,
   data: string,
-  options?: string | FileOptions
+  options?: string | WriteFileOptions
 ): void {
   let rid = -1;
 
@@ -110,7 +115,7 @@ export function appendFileSync(
 }
 
 function validateEncoding(
-  encodingOption: string | FileOptions | undefined
+  encodingOption: string | WriteFileOptions | undefined
 ): void {
   if (!encodingOption) return;
 
@@ -122,80 +127,3 @@ function validateEncoding(
     throw new Error("Only 'utf8' encoding is currently supported");
   }
 }
-
-function getOpenOptions(flag: string | undefined): Deno.OpenOptions {
-  if (!flag) {
-    return { create: true, append: true };
-  }
-
-  let openOptions: Deno.OpenOptions;
-  switch (flag) {
-    case "a": {
-      // 'a': Open file for appending. The file is created if it does not exist.
-      openOptions = { create: true, append: true };
-      break;
-    }
-    case "ax": {
-      // 'ax': Like 'a' but fails if the path exists.
-      openOptions = { createNew: true, write: true, append: true };
-      break;
-    }
-    case "a+": {
-      // 'a+': Open file for reading and appending. The file is created if it does not exist.
-      openOptions = { read: true, create: true, append: true };
-      break;
-    }
-    case "ax+": {
-      // 'ax+': Like 'a+' but fails if the path exists.
-      openOptions = { read: true, createNew: true, append: true };
-      break;
-    }
-    case "r": {
-      // 'r': Open file for reading. An exception occurs if the file does not exist.
-      openOptions = { read: true };
-      break;
-    }
-    case "r+": {
-      // 'r+': Open file for reading and writing. An exception occurs if the file does not exist.
-      openOptions = { read: true, write: true };
-      break;
-    }
-    case "w": {
-      // 'w': Open file for writing. The file is created (if it does not exist) or truncated (if it exists).
-      openOptions = { create: true, write: true, truncate: true };
-      break;
-    }
-    case "wx": {
-      // 'wx': Like 'w' but fails if the path exists.
-      openOptions = { createNew: true, write: true };
-      break;
-    }
-    case "w+": {
-      // 'w+': Open file for reading and writing. The file is created (if it does not exist) or truncated (if it exists).
-      openOptions = { create: true, write: true, truncate: true, read: true };
-      break;
-    }
-    case "wx+": {
-      // 'wx+': Like 'w+' but fails if the path exists.
-      openOptions = { createNew: true, write: true, read: true };
-      break;
-    }
-    case "as": {
-      // 'as': Open file for appending in synchronous mode. The file is created if it does not exist.
-      openOptions = { create: true, append: true };
-    }
-    case "as+": {
-      // 'as+': Open file for reading and appending in synchronous mode. The file is created if it does not exist.
-      openOptions = { create: true, read: true, append: true };
-    }
-    case "rs+": {
-      // 'rs+': Open file for reading and writing in synchronous mode. Instructs the operating system to bypass the local file system cache.
-      openOptions = { create: true, read: true, write: true };
-    }
-    default: {
-      throw new Error(`Unrecognized file system flag: ${flag}`);
-    }
-  }
-
-  return openOptions;
-}