File size: 1,780 Bytes
c61f7ed | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | // Simple eval helper — runs an expression and returns the result.value.
//
// node scripts/eval.mjs "document.title"
// HERMES_DESKTOP_CDP_PORT=9333 node scripts/eval.mjs "document.title"
//
// Needs a renderer with a debugging port: launch `hgui` / `npm run dev` with
// HERMES_DESKTOP_CDP_PORT set (see electron/dev-cdp.ts).
const port = Number(process.env.HERMES_DESKTOP_CDP_PORT || 9222)
let targets
try {
targets = await (await fetch(`http://127.0.0.1:${port}/json`)).json()
} catch {
console.error(
`no renderer debugging port on 127.0.0.1:${port}. ` +
'Dev-server runs (`npm run dev` / `hgui`) open one automatically — check the app is running, ' +
'and that HERMES_DESKTOP_CDP_PORT is not set to "off" or another port.'
)
process.exit(1)
}
const t = targets.find((t) => t.url.includes('5174')) ?? targets.find((t) => t.type === 'page')
if (!t) {
console.error(`no page target on 127.0.0.1:${port} (found ${targets.length} target(s))`)
process.exit(1)
}
const ws = new WebSocket(t.webSocketDebuggerUrl)
let id = 0
const pending = new Map()
ws.addEventListener('message', (ev) => {
const m = JSON.parse(ev.data)
if (pending.has(m.id)) { pending.get(m.id)(m); pending.delete(m.id) }
})
await new Promise((r) => ws.addEventListener('open', r))
const send = (method, params) => new Promise((res) => { const i = ++id; pending.set(i, res); ws.send(JSON.stringify({ id: i, method, params })) })
const expr = process.argv[2] || '1+1'
const r = await send('Runtime.evaluate', { expression: expr, returnByValue: true, awaitPromise: true })
if (r.result.exceptionDetails) {
console.error('EXCEPTION:', r.result.exceptionDetails.exception?.description)
} else {
console.log(JSON.stringify(r.result.result.value, null, 2))
}
ws.close()
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