[Code Quality] Fix ESLint require-fetch-try-catch false negative for member-chained fetch

[github-actions]

Description

The require-fetch-try-catch ESLint rule in eslint-factory/src/index.ts has a false negative: isAwaitFetchCall only matches an awaited CallExpression whose callee is the bare fetch Identifier. Any member-chained call (await fetch(url).then(...), .catch(...), .json()) has a MemberExpression callee and is silently ignored — including bare .then() chains without a rejection handler, which would crash on a network TypeError.

Grounded example: validate_secrets.cjs:65,85 — await fetch(...).catch(rethrowAbortError) escapes detection. While safe today (via outer try), the shape silently bypasses the rule and could mask future violations of the same pattern.

Suggested Changes

• Extend isAwaitFetchCall to also recognize await fetch(...).method(...) chains where fetch is the root callee
• Add logic to determine if a chain is "safe": terminal .catch(handler) or 2-arg .then(onFulfilled, onRejected) should be treated as satisfying the requirement
• Add test cases:
  • await fetch(url).json() with no try/catch — invalid (should flag)
  • await fetch(url).catch(handler) — valid (should not flag)
  • await fetch(url).then(ok, err) — valid (should not flag)
  • await fetch(url).then(ok) — invalid (no rejection handler)

Files Affected

• eslint-factory/src/index.ts (require-fetch-try-catch rule, isAwaitFetchCall helper)
• eslint-factory/src/tests/ (add test cases for chained patterns)

Success Criteria

• await fetch(url).json() outside a try is flagged
• await fetch(url).catch(handler) is not flagged
• await fetch(url).then(ok, err) is not flagged
• await fetch(url).then(ok) (1-arg) is flagged
• Existing test cases unchanged
• ESLint factory tests pass

Priority

Medium — prevents real-world fetch chain crashes from escaping detection

Source

Extracted from ESLint Refiner Daily Report 2026-07-25 discussion #47933

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• expires on Jul 25, 2026, 11:34 PM UTC-08:00