fix: terminate the last line of file output with a newline

Author: johannschopplich

packages/cli/src/conversion.ts

@@ -38,7 +38,7 @@ export async function encodeToToon(config: {
     const toonOutput = encode(data, encodeOptions)
 
     if (config.output) {
-      await fsp.writeFile(config.output, toonOutput, 'utf-8')
+      await fsp.writeFile(config.output, `${toonOutput}\n`, 'utf-8')
     }
     else {
       console.log(toonOutput)
@@ -119,9 +119,7 @@ async function writeStream(
       isFirst = false
     }
 
-    // Stdout gets a trailing newline so the shell prompt resumes on a fresh line.
-    if (!outputPath)
-      process.stdout.write('\n')
+    await write('\n')
   }
   finally {
     await fileHandle?.close()

packages/cli/test/cli.test.ts

@@ -48,7 +48,7 @@ describe('toon CLI', () => {
         indent: 2,
       })
 
-      expect(output).toBe(expected)
+      expect(output).toBe(`${expected}\n`)
       expect(stderr).toMatch(/Encoded .* → .*/)
     })
 
@@ -71,7 +71,7 @@ describe('toon CLI', () => {
       try {
         const { stderr } = await runCli(['--output', 'output.toon'], { cwd: directory })
 
-        expect(await readOutput(directory, 'output.toon')).toBe(encode(data))
+        expect(await readOutput(directory, 'output.toon')).toBe(`${encode(data)}\n`)
         expect(stderr).toMatch(/Encoded.*stdin[^\n\r\u2028\u2029\u2192]*\u2192.*output\.toon/)
       }
       finally {
@@ -87,7 +87,7 @@ describe('toon CLI', () => {
 
       await runCli(['empty.json', '--output', 'output.toon'], { cwd: directory })
 
-      expect(await readOutput(directory, 'output.toon')).toBe(encode(data))
+      expect(await readOutput(directory, 'output.toon')).toBe(`${encode(data)}\n`)
     })
 
     it('writes a large JSON input identically to one-shot encoding', async () => {
@@ -104,13 +104,12 @@ describe('toon CLI', () => {
 
       const { stderr } = await runCli(['large-input.json', '--output', 'output.toon'], { cwd: directory })
 
-      // Streaming has to produce byte-identical output to the one-shot `encode()`.
       const expected = encode(data, {
         delimiter: DEFAULT_DELIMITER,
         indent: 2,
       })
 
-      expect(await readOutput(directory, 'output.toon')).toBe(expected)
+      expect(await readOutput(directory, 'output.toon')).toBe(`${expected}\n`)
       expect(stderr).toMatch(/Encoded .* → .*/)
     })
   })