Function hasNonEmptyPlanFile

src/node/utils/runtime/helpers.ts:171–199

(
  runtime: Runtime,
  workspaceName: string,
  projectName: string,
  workspaceId: string
)

 * Checks both the canonical (per-project) path and the legacy (by workspaceId) path.
 */
export async function hasNonEmptyPlanFile(
  runtime: Runtime,
  workspaceName: string,
  projectName: string,
  workspaceId: string
): Promise<boolean> {
  // Defensive: missing identifiers means we cannot safely resolve plan paths.
  if (!workspaceName || !projectName || !workspaceId) {
    return false;
  }

  const muxHome = runtime.getMuxHome();
  const planPath = getPlanFilePath(workspaceName, projectName, muxHome);
  // Legacy paths only used for non-Docker runtimes.
  const legacyPath = getLegacyPlanFilePath(workspaceId);

  for (const candidatePath of [planPath, legacyPath]) {
    try {
      const stat = await runtime.stat(candidatePath);
      if (!stat.isDirectory && stat.size > 0) {
        return true;
      }
    } catch {
      // Try next candidate.
    }
  }

  return false;
}

/**
 * Move a plan file from one workspace name to another (e.g., during rename).