import fs from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const DEFAULT_NODE_DEFS_PATH = path.join(__dirname, "..", "data", "nodeDefinitions.sample.json");
let cachedPath: string | null = null;
let cachedNodes: unknown[] | null = null;
const resolveNodeDefinitionsPath = () =>
process.env.NODEGRAPH_NODE_DEFS_PATH
? path.resolve(process.env.NODEGRAPH_NODE_DEFS_PATH)
: DEFAULT_NODE_DEFS_PATH;
export const loadNodeDefinitions = async () => {
const nodeDefsPath = resolveNodeDefinitionsPath();
if (cachedNodes && cachedPath === nodeDefsPath) {
return cachedNodes;
}
const raw = await fs.readFile(nodeDefsPath, "utf8");
const parsed = JSON.parse(raw);
if (!Array.isArray(parsed)) {
throw new Error(`Node definitions file must contain a JSON array: ${nodeDefsPath}`);
}
cachedPath = nodeDefsPath;
cachedNodes = parsed;
return parsed;
};
