refactor(ext/fs): align error messages

Aligns the error messages in the ext/fs folder to be in-line with the
Deno style guide.

denoland#25269

ext/fs/30_fs.js

@@ -631,7 +631,7 @@ class FsFile {
       );
       if (internals.future) {
         throw new TypeError(
-          "`Deno.FsFile` cannot be constructed, use `Deno.open()` or `Deno.openSync()` instead.",
+          "`Deno.FsFile` cannot be constructed, use `Deno.open()` or `Deno.openSync()` instead",
         );
       }
     }
@@ -776,11 +776,15 @@ function checkOpenOptions(options) {
       (val) => val === true,
     ).length === 0
   ) {
-    throw new Error("OpenOptions requires at least one option to be true");
+    throw new Error(
+      "Cannot open file: `options` requires at least one option to be true",
+    );
   }
 
   if (options.truncate && !options.write) {
-    throw new Error("'truncate' option requires 'write' option");
+    throw new Error(
+      "Cannot open file: 'truncate' option requires 'write' to be true",
+    );
   }
 
   const createOrCreateNewWithoutWriteOrAppend =
@@ -789,7 +793,7 @@ function checkOpenOptions(options) {
 
   if (createOrCreateNewWithoutWriteOrAppend) {
     throw new Error(
-      "'create' or 'createNew' options require 'write' or 'append' option",
+      "Cannot open file: 'create' or 'createNew' options require 'write' or 'append' to be true",
     );
   }
 }

tests/specs/future/runtime_api/main.js

@@ -74,7 +74,7 @@ try {
   if (
     error instanceof TypeError &&
     error.message ===
-      "`Deno.FsFile` cannot be constructed, use `Deno.open()` or `Deno.openSync()` instead."
+      "`Deno.FsFile` cannot be constructed, use `Deno.open()` or `Deno.openSync()` instead"
   ) {
     console.log("Deno.FsFile constructor is illegal");
   }

tests/unit/files_test.ts

@@ -139,31 +139,31 @@ Deno.test(async function openOptions() {
       await Deno.open(filename, { write: false });
     },
     Error,
-    "OpenOptions requires at least one option to be true",
+    "Cannot open file: `options` requires at least one option to be true",
   );
 
   await assertRejects(
     async () => {
       await Deno.open(filename, { truncate: true, write: false });
     },
     Error,
-    "'truncate' option requires 'write' option",
+    "Cannot open file: 'truncate' option requires 'write' to be true",
   );
 
   await assertRejects(
     async () => {
       await Deno.open(filename, { create: true, write: false });
     },
     Error,
-    "'create' or 'createNew' options require 'write' or 'append' option",
+    "Cannot open file: 'create' or 'createNew' options require 'write' or 'append' to be true",
   );
 
   await assertRejects(
     async () => {
       await Deno.open(filename, { createNew: true, append: false });
     },
     Error,
-    "'create' or 'createNew' options require 'write' or 'append' option",
+    "Cannot open file: 'create' or 'createNew' options require 'write' or 'append' to be true",
   );
 });