feat: 🎸 add truncateSync() and ftruncateSync() methods

demo/fsa/main.ts

@@ -66,6 +66,11 @@ const demo = async (dir: fsa.IFileSystemDirectoryHandle) => {
   await fs.promises.mkdir('/tmp');
   const tmpDirName = fs.mkdtempSync('/tmp/temporary-');
   strictEqual(fs.statSync(tmpDirName).isDirectory(), true);
+
+  console.log('truncateSync() - can truncate a file');
+  await fs.promises.writeFile('/truncated.txt', 'truncate here: abcdefghijklmnopqrstuvwxyz');
+  fs.truncateSync('/truncated.txt', 14);
+  strictEqual(fs.readFileSync('/truncated.txt', 'utf8'), 'truncate here:');
 };
 
 const main = async () => {

src/fsa-to-node/FsaNodeFs.ts

@@ -891,12 +891,21 @@ export class FsaNodeFs extends FsaNodeCore implements FsCallbackApi, FsSynchrono
     return bufferToEncoding(buffer, opts.encoding);
   };
 
-  public readonly ftruncateSync: FsSynchronousApi['ftruncateSync'] = notSupported;
+  public readonly truncateSync: FsSynchronousApi['truncateSync'] = (id: misc.TFileId, len?: number): void => {
+    if (isFd(id)) return this.ftruncateSync(id as number, len);
+    const filename = pathToFilename(id as misc.PathLike);
+    this.getSyncAdapter().call('trunc', [filename, Number(len) || 0]);
+  };
+
+  public readonly ftruncateSync: FsSynchronousApi['ftruncateSync'] = (fd: number, len?: number): void => {
+    const filename = this.getFileName(fd);
+    this.truncateSync(filename, len);
+  };
+
   public readonly openSync: FsSynchronousApi['openSync'] = notSupported;
   public readonly readdirSync: FsSynchronousApi['readdirSync'] = notSupported;
   public readonly readSync: FsSynchronousApi['readSync'] = notSupported;
   public readonly realpathSync: FsSynchronousApi['realpathSync'] = notSupported;
-  public readonly truncateSync: FsSynchronousApi['truncateSync'] = notSupported;
   public readonly unlinkSync: FsSynchronousApi['unlinkSync'] = notSupported;
   public readonly writeSync: FsSynchronousApi['writeSync'] = notSupported;
 

src/fsa-to-node/types.ts

@@ -18,6 +18,7 @@ export interface FsaNodeSyncAdapterApi {
   rm(req: [filename: string, opts?: opts.IRmOptions]): void;
   mkdir(req: [filename: string, opts?: misc.TMode | opts.IMkdirOptions]): string | undefined;
   mkdtemp(req: [filename: string, opts?: misc.TMode | opts.IOptions]): string;
+  trunc(req: [filename: string, len: number]): void;
 }
 
 export interface FsaNodeSyncAdapter {

src/fsa-to-node/worker/FsaNodeSyncWorker.ts

@@ -153,5 +153,8 @@ export class FsaNodeSyncWorker {
     mkdtemp: async ([filename]): Promise<string> => {
       return await this.fs.promises.mkdtemp(filename, {encoding: 'utf8'}) as string;
     },
+    trunc: async ([filename, len]): Promise<void> => {
+      await this.fs.promises.truncate(filename, len);
+    },
   };
 }