refactor: add utility function for writing JSON files

android/autolink.mjs

@@ -9,7 +9,7 @@ import {
   readTextFile,
   writeTextFile,
 } from "../scripts/helpers.js";
-import { mkdir_p } from "../scripts/utils/filesystem.mjs";
+import { mkdir_p, writeJSONFile } from "../scripts/utils/filesystem.mjs";
 
 /**
  * @typedef {import("@react-native-community/cli-types").Config} Config
@@ -97,7 +97,7 @@ async function loadConfig(json, projectRoot) {
   const prunedConfig = pruneDependencies(config);
 
   ensureDirForFile(json);
-  writeTextFile(json, JSON.stringify(prunedConfig, undefined, 2) + "\n");
+  writeJSONFile(json, prunedConfig);
   writeTextFile(stateFile, state);
   return prunedConfig;
 }
@@ -117,12 +117,11 @@ async function main(projectRoot, output) {
   );
   const dependencies = pickAndroidDependencies(config);
 
-  const json = JSON.stringify(dependencies, undefined, 2);
   if (!output) {
-    console.log(json);
+    console.log(JSON.stringify(dependencies, undefined, 2));
   } else {
     ensureDirForFile(output);
-    writeTextFile(output, json + "\n");
+    writeJSONFile(output, dependencies);
   }
 }
 

ios/assetsCatalog.mjs

@@ -4,7 +4,12 @@ import * as nodefs from "node:fs";
 import * as path from "node:path";
 import { sourceForAppConfig } from "../scripts/appConfig.mjs";
 import { readJSONFile } from "../scripts/helpers.js";
-import { cp_r, mkdir_p, rm_r } from "../scripts/utils/filesystem.mjs";
+import {
+  cp_r,
+  mkdir_p,
+  rm_r,
+  writeJSONFile,
+} from "../scripts/utils/filesystem.mjs";
 import { isObject, projectPath } from "./utils.mjs";
 
 /**
@@ -146,6 +151,6 @@ export function generateAssetsCatalogs(
 
     const contents = { images, info: template["info"] };
     const dest = path.join(appIconSet, "Contents.json");
-    fs.writeFileSync(dest, JSON.stringify(contents, undefined, 2));
+    writeJSONFile(dest, contents, fs);
   }
 }

scripts/internal/prepare-viewfinder.mts

@@ -1,10 +1,10 @@
 #!/usr/bin/env -S node --experimental-transform-types --no-warnings
 
 import { spawnSync } from "node:child_process";
-import * as fs from "node:fs";
 import * as path from "node:path";
 import { URL, fileURLToPath } from "node:url";
 import { readJSONFile } from "../helpers.js";
+import { writeJSONFile } from "../utils/filesystem.mjs";
 
 const APP_IDENTIFIER = "com.microsoft.ReactNativeViewfinder";
 const PACKAGE_MANAGER = "yarn";
@@ -34,7 +34,7 @@ function configureAppManifest() {
     },
   };
 
-  fs.writeFileSync(APP_MANIFEST, JSON.stringify(manifest, null, 2) + "\n");
+  writeJSONFile(APP_MANIFEST, manifest);
 }
 
 /**

scripts/internal/set-react-version.mts

@@ -2,8 +2,7 @@
  * Reminder that this script is meant to be runnable without installing
  * dependencies. It can therefore not rely on any external libraries.
  */
-import { promises as fs } from "node:fs";
-import * as os from "node:os";
+import * as fs from "node:fs";
 import * as path from "node:path";
 import * as util from "node:util";
 import {
@@ -14,6 +13,7 @@ import {
   v,
 } from "../helpers.js";
 import type { Manifest } from "../types.js";
+import { writeJSONFile } from "../utils/filesystem.mjs";
 import { fetchPackageMetadata, npmRegistryBaseURL } from "../utils/npm.mjs";
 
 const VALID_TAGS = ["canary-macos", "canary-windows", "nightly"];
@@ -36,12 +36,12 @@ function searchReplaceInFile(
   filename: string,
   searchValue: string | RegExp,
   replaceValue: string
-): Promise<void> {
+): void {
   const current = readTextFile(filename);
   const updated = current.replace(searchValue, replaceValue);
-  return updated === current
-    ? Promise.resolve()
-    : fs.writeFile(filename, updated);
+  if (updated !== current) {
+    fs.writeFileSync(filename, updated);
+  }
 }
 
 /**
@@ -331,7 +331,6 @@ export async function setReactVersion(
   coreOnly: boolean,
   overrides: Record<string, string> = {}
 ): Promise<void> {
-  let fd: fs.FileHandle | undefined;
   try {
     const profile = { ...(await getProfile(version, coreOnly)), ...overrides };
     console.dir(profile, { depth: null });
@@ -363,18 +362,12 @@ export async function setReactVersion(
       }
 
       const tmpFile = manifestPath + ".tmp";
-      fd = await fs.open(tmpFile, "w", 0o644);
-      await fd.write(JSON.stringify(manifest, undefined, 2));
-      await fd.write(os.EOL);
-      await fd.close();
-      fd = undefined;
-      await fs.rename(tmpFile, manifestPath);
+      writeJSONFile(tmpFile, manifest);
+      fs.renameSync(tmpFile, manifestPath);
     }
   } catch (e) {
     console.error(e);
     process.exitCode = 1;
-  } finally {
-    fd?.close();
   }
 }
 

scripts/utils/filesystem.mjs

@@ -26,3 +26,14 @@ export function mkdir_p(p, fs = nodefs) {
 export function rm_r(p, fs = nodefs) {
   fs.rmSync(p, RM_R_OPTIONS);
 }
+
+/**
+ * @param {string} path
+ * @param {unknown} obj
+ */
+export function writeJSONFile(path, obj, fs = nodefs) {
+  const fd = fs.openSync(path, "w", 0o644);
+  fs.writeSync(fd, JSON.stringify(obj, undefined, 2));
+  fs.writeSync(fd, "\n");
+  fs.closeSync(fd);
+}