microsoft/vscode · error · InvalidPatchFormatError

invalidAddFileLine

invalidAddFileLine

Error message

Invalid Add File Line: ${s}

What it means

Error "Invalid Add File Line: ${s}" thrown in microsoft/vscode.

Source

Thrown at extensions/copilot/src/extension/tools/node/applyPatch/parser.ts:457

			index = match.line + nextSection.nextChunkContext.length;
			this.index = nextSection.endPatchIndex;
		}
		return action;
	}

	private parse_add_file(): PatchAction {
		const lines: Array<string> = [];
		while (
			!this.is_done([
				PATCH_SUFFIX,
				UPDATE_FILE_PREFIX,
				DELETE_FILE_PREFIX,
				ADD_FILE_PREFIX,
			])
		) {
			const s = this.read_str();
			if (!s.startsWith(HUNK_ADD_LINE_PREFIX)) {
				throw new InvalidPatchFormatError(`Invalid Add File Line: ${s}`, 'invalidAddFileLine');
			}
			lines.push(s.slice(1));
		}
		return {
			type: ActionType.ADD,
			newFile: lines.join('\n'),
			chunks: [],
		};
	}
}

export function replace_explicit_tabs(s: string) {
	return s.replace(/^(?:\s|\\t|\/|#)*/gm, r => r.replaceAll('\\t', '\t'));
}

export function replace_explicit_nl(s: string) {
	return replace_explicit_tabs(s.replaceAll('\\n', '\n'));
}

View on GitHub (pinned to a94b963a32)

When it happens

Trigger: Thrown at extensions/copilot/src/extension/tools/node/applyPatch/parser.ts:457 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/vscode@a94b963a32 (2026-08-12). Data as JSON: /api/errors/ab9cf7ff9a2eb9e9. Report an issue: GitHub.