cli: add --await and --tab flags to bbx eval#13
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page.evaluate already supports awaitPromise at the protocol and
extension layers (Runtime.evaluate({awaitPromise: true})), but the
`bbx eval` CLI command had no way to set it.
Now: `bbx eval --await "fetch('/api').then(r => r.json())"` waits for
the Promise to resolve and returns the final value, instead of `{}`.
Also adds --tab support (same extractTabFlag pattern as other commands).
Usage: bbx eval [--tab <id>] [--await] <expression>
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koltyakov
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Jun 9, 2026
Kept both handleFetchInterceptRequest (this PR) and handleActivateTab (from koltyakov#14) in background.js; combined intercept help lines with the updated eval usage line (from koltyakov#13) in command-registry.js. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Problem
`page.evaluate` at the protocol layer already supports `awaitPromise` (passes it to CDP `Runtime.evaluate`), but the `bbx eval` CLI command had no way to set it. Async IIFEs return `{}` (a Promise object serialized by value) instead of the resolved value.
Fix
Add `--await` flag: `bbx eval --await "fetch('/api').then(r => r.json())"` waits for the Promise and returns the final value.
Also adds `--tab` support (same `extractTabFlag` pattern as other commands).
Test plan