1import fs from 'fs'
2import { throPtErr } from '../../sharedF/throwErrorF/sharedErrF.mts'
3
4// esbuild emits `await init_X()` inside non-async __esm factories when a TLA-containing circular
5// dep enters the graph — bundle then crashes at boot with "SyntaxError: Unexpected reserved word".
6// Fast-fail at build time instead of shipping a broken bundle.
7export const guardBundleValidAwait = ({bundleAbsPath}: {bundleAbsPath: string}) => {
8  const lines = fs.readFileSync(bundleAbsPath, 'utf8').split('\n')
9  const bad: string[] = []
10  let curFactory: string | null = null, curSync = false
11  for (const line of lines) {
12    const m = line.match(/^  (async )?"([^"]+)"\(\) \{/)
13    if (m) {
14      curFactory = m[2]
15      curSync = !m[1]
16    }
17    if (curSync && /^    await init_/.test(line)) {
18      bad.push(`${curFactory}: ${line.trim()}`)
19    }
20  }
21  if (bad.length) {
22    throPtErr('esbuild emitted await-in-sync-fn (TLA cycle pulled into bundle)', {bad: bad.slice(0, 10), bundleAbsPath})
23  }
24}
25