import { expect, test } from "bun:test";
import { HMR_CLIENT_JS } from "../src/runtime.ts";

test("the HMR client script is syntactically valid JavaScript", () => {
  // HMR_CLIENT_JS is a TypeScript template literal, so an escape like \t or \n
  // written unescaped is expanded by TypeScript into a real control character.
  // Inside a regex literal that produces a raw newline, which is a syntax error
  // that silently kills the whole HMR client in the browser.
  expect(() => new Function(HMR_CLIENT_JS)).not.toThrow();
});

test("the HMR client contains no raw control characters inside regex literals", () => {
  const regexLiterals = HMR_CLIENT_JS.match(/\/(?![/*])(?:\.|\[[^\]]*\]|[^/\n\r])+\//g) ?? [];
  expect(regexLiterals.length).toBeGreaterThan(0);
  for (const literal of regexLiterals) {
    expect(literal).not.toMatch(/[\n\r\t]/);
  }
});