From 7def00e3778077fa7a6147a9469957624549df34 Mon Sep 17 00:00:00 2001
From: davidpavlovschi <davidpavlov2048@gmail.com>
Date: Thu, 30 Jul 2026 22:59:31 +0300
Subject: [PATCH] fix: avoid crash when contributors tag is at the start of a
 file

When a file begins with the ALL-CONTRIBUTORS-LIST:START tag, nbSpaces is 0 and
' '.repeat(nbSpaces - 1) throws RangeError: Invalid count value: -1.

Clamp the indent to zero, which matches the width already produced for a tag
sitting at column 0 on any later line.

Closes #376
---
 src/generate/__tests__/index.js | 17 +++++++++++++++++
 src/generate/index.js           |  2 +-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/generate/__tests__/index.js b/src/generate/__tests__/index.js
index 8b247f9a..33a06c87 100644
--- a/src/generate/__tests__/index.js
+++ b/src/generate/__tests__/index.js
@@ -277,3 +277,20 @@ test('validate if cell width attribute is floored correctly', () => {
 
   expect(result).toMatchSnapshot()
 })
+
+test('inject the table when the ALL-CONTRIBUTORS-LIST tag starts the file', () => {
+  const {kentcdodds, bogas04} = contributors
+  const {options} = fixtures()
+  const contributorList = [kentcdodds, bogas04]
+  const content = [
+    '<!-- ALL-CONTRIBUTORS-LIST:START -->FOO BAR BAZ<!-- ALL-CONTRIBUTORS-LIST:END -->',
+    '',
+    'Thanks a lot everyone!',
+  ].join('\n')
+
+  const result = generate(options, contributorList, content)
+
+  expect(result).toContain('<table>')
+  expect(result).toContain('<!-- ALL-CONTRIBUTORS-LIST:END -->')
+  expect(result).not.toContain('FOO BAR BAZ')
+})
diff --git a/src/generate/index.js b/src/generate/index.js
index 07ad73f7..61082c59 100644
--- a/src/generate/index.js
+++ b/src/generate/index.js
@@ -42,7 +42,7 @@ function injectListBetweenTags(newContent) {
       previousContent.slice(0, endOfOpeningTagIndex + closingTag.length),
       '\n<!-- prettier-ignore-start -->',
       '\n<!-- markdownlint-disable -->',
-      newContent.replace('\n', `\n${' '.repeat(nbSpaces - 1)}`),
+      newContent.replace('\n', `\n${' '.repeat(Math.max(0, nbSpaces - 1))}`),
       '<!-- markdownlint-restore -->',
       '\n<!-- prettier-ignore-end -->',
       '\n\n',