fix(std/json): Add newline at the end of json files (#6885)

1 files changed, 27 insertions, 24 deletions

diff --git a/std/fs/write_json.ts b/std/fs/write_json.ts
index 015957bba..46c33572a 100644
--- a/std/fs/write_json.ts
+++ b/std/fs/write_json.ts
@@ -2,32 +2,43 @@
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 type Replacer = (key: string, value: any) => any;
 
-export interface WriteJsonOptions {
-  spaces?: number | string;
+export interface WriteJsonOptions extends Deno.WriteFileOptions {
   replacer?: Array<number | string> | Replacer;
+  spaces?: number | string;
 }
 
-/* Writes an object to a JSON file. */
-export async function writeJson(
+function serialize(
   filePath: string,
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   object: any,
-  options: WriteJsonOptions = {},
-): Promise<void> {
-  let contentRaw = "";
-
+  options: WriteJsonOptions,
+): string {
   try {
-    contentRaw = JSON.stringify(
+    const jsonString = JSON.stringify(
       object,
       options.replacer as string[],
       options.spaces,
     );
+    return `${jsonString}\n`;
   } catch (err) {
     err.message = `${filePath}: ${err.message}`;
     throw err;
   }
+}
 
-  await Deno.writeFile(filePath, new TextEncoder().encode(contentRaw));
+/* Writes an object to a JSON file. */
+export async function writeJson(
+  filePath: string,
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  object: any,
+  options: WriteJsonOptions = {},
+): Promise<void> {
+  const jsonString = serialize(filePath, object, options);
+  await Deno.writeTextFile(filePath, jsonString, {
+    append: options.append,
+    create: options.create,
+    mode: options.mode,
+  });
 }
 
 /* Writes an object to a JSON file. */
@@ -37,18 +48,10 @@ export function writeJsonSync(
   object: any,
   options: WriteJsonOptions = {},
 ): void {
-  let contentRaw = "";
-
-  try {
-    contentRaw = JSON.stringify(
-      object,
-      options.replacer as string[],
-      options.spaces,
-    );
-  } catch (err) {
-    err.message = `${filePath}: ${err.message}`;
-    throw err;
-  }
-
-  Deno.writeFileSync(filePath, new TextEncoder().encode(contentRaw));
+  const jsonString = serialize(filePath, object, options);
+  Deno.writeTextFileSync(filePath, jsonString, {
+    append: options.append,
+    create: options.create,
+    mode: options.mode,
+  });
 }