scriptc/packages/compiler/test/buffer-from-dynamic.test.ts

import { spawnSync } from "node:child_process";
import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { expect, test } from "vitest";
import { compile } from "../src/index.js";

test.each(["c", "llvm"] as const)("untyped Buffer inputs keep explicit object-boundary refusals (%s)", async (backend) => {
  const dir = mkdtempSync(join(tmpdir(), "scriptc-buffer-from-"));
  try {
    const entry = join(dir, "main.cjs");
    writeFileSync(entry, `
/** @param {unknown} value */
function from(value) { return Buffer.from(value); }
function attempt(value) {
  try { from(value); }
  catch (error) { console.log(error.name, error.message); }
}
attempt({ valueOf() { console.log("must not execute hook"); return "abc"; } });
class Input { length = 0; }
attempt(new Input());
console.log("after");
`);
    const result = await compile(entry, {
      backend, dynamic: false, sanitize: process.env["SCRIPTC_SAN"] === "1",
      outDir: dir, outPath: join(dir, "program"),
    });
    expect(result.ok, JSON.stringify(result.diagnostics)).toBe(true);
    if (!result.ok) return;
    const child = spawnSync(result.binaryPath, [], { encoding: "utf8" });
    expect(child.status).toBe(0);
    expect(child.stderr).toBe("");
    expect(child.stdout).toBe(
      "Error Buffer.from with a custom valueOf is not supported yet\n" +
      "Error Buffer.from with an opaque reference is not supported yet\nafter\n",
    );
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});