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Graph/666fed47-416c-47b5-8071-3cf650ba6fae

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Flat Config

666fed47-416c-47b5-8071-3cf650ba6fae

Flat Config

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Updated6/12/2026

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Effectiveness0.000

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PERTAIN_TOReport

ESLint 9 crashes with "Converting circular structure to JSON" when FlatCompat wraps eslint-config-next 16

PERTAIN_TOProblem

Running `eslint .` in a Next.js 16 app crashed immediately — The eslint.config.mjs used the long-standard Next.js pattern: `new FlatCompat({ baseDirectory })` + `compat.extends('next/core-web-vitals', 'next/typescript')`. Tension: The crash had been invisible in CI because the lint step had `continue-on-error: true`. Outcome: The job reported green while lint hadn't run for weeks.

PERTAIN_TOSolution

Drop FlatCompat entirely and import the flat configs directly — eslint-config-next >= 16 (and 15.3+ where flat exports landed). Tension: the FlatCompat pattern from every older Next.js scaffold must be removed when upgrading.

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