Add support for directory creation to --output-file flag (#5672)

lib/__tests__/writeOutputFile.test.js

@@ -0,0 +1,27 @@
+'use strict';
+
+const path = require('path');
+const fs = require('fs').promises;
+const writeOutputFile = require('../writeOutputFile');
+
+describe('writeOutputFile', () => {
+	it('creates a file', async () => {
+		const filePath = path.resolve(__dirname, 'tmpfile');
+
+		await writeOutputFile('test content', filePath);
+
+		expect((await fs.readFile(filePath)).toString()).toEqual('test content');
+
+		await fs.unlink(filePath);
+	});
+
+	it('creates a directory if it does not exist', async () => {
+		const filePath = path.resolve(__dirname, 'tmpdir/tmpfile');
+
+		await writeOutputFile('test content', filePath);
+
+		expect((await fs.readFile(filePath)).toString()).toEqual('test content');
+
+		await fs.rmdir(path.dirname(filePath), { recursive: true });
+	});
+});

lib/writeOutputFile.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const path = require('path');
+const { mkdir } = require('fs').promises;
 const stripAnsi = require('strip-ansi');
 const writeFileAtomic = require('write-file-atomic');
 
@@ -10,4 +11,6 @@ const writeFileAtomic = require('write-file-atomic');
  * @returns {Promise<void>}
  */
 module.exports = (content, filePath) =>
-	writeFileAtomic(path.normalize(filePath), stripAnsi(content));
+	mkdir(path.dirname(filePath), { recursive: true }).then(() =>
+		writeFileAtomic(path.normalize(filePath), stripAnsi(content)),
+	);