Esbuild plugin for compiling relay queries

esbuild-relay.js

import { promises } from "fs";
import crypto from "crypto";
import path from "path";
import { print, parse } from "graphql";

const plugin = {
	name: "relay",
	setup: build => {
		build.onLoad({ filter: /\.tsx$/, namespace: "" }, async args => {
			let contents = await promises.readFile(args.path, "utf8");

			if (contents.includes("graphql`")) {
				let imports = [];

				contents = contents.replaceAll(/graphql`([\s\S]*?)`/gm, (match, query) => {
					const formatted = print(parse(query));
					const name = /(fragment|mutation|query) (\w+)/.exec(formatted)[2];
					// const hash = crypto.createHash("md5").update(formatted, "utf8").digest("hex");

					let id = `graphql__${crypto.randomBytes(10).toString("hex")}`;
					imports.push(`import ${id} from "./__generated__/${name}.graphql.ts";`);
					return id;
				});

				contents = imports.join("\n") + contents;
			}

			return {
				contents: contents,
				loader: "tsx",
			};
		});
	},
};