esbuild-async.js

// @ts-check
import * as esbuild from "esbuild";
import * as fs from "node:fs";
import { parseTypeScriptAST } from "./ts-parse.js";

function assert(v) {
    if (!v) throw new Error();
}

const input = fs.readFileSync(process.argv[2], "utf-8");
const count = Number(process.argv[3]) || 100;
const parseTS = process.argv.includes("--ts-ast");

/** @type {esbuild.TransformOptions} */
const options = {
    format: "esm",
    target: "esnext",
    sourcemap: "external",
    loader: "ts",
};

async function main() {
    const p = [];
    for (let i = 0; i < count; i++) {
        const out = esbuild.transform(input, options);
        p.push(
            out.then((out) => {
                assert(out.map.length > 100);
                assert(out.code.length > 100);
            }),
        );
    }
    if (parseTS) {
        await parseTypeScriptAST(input, count);
    }
    await Promise.all(p);
}
main();