Incident Dossier

Prod Flag Defaulted On

After a flag rollout, SRE flipped the feature flag to off in the deploy environment, but production traffic still flows through the new code path. The configuration helper that interprets the flag value disagrees with the team's expectation of an explicit off switch.

Initial failing signalfeature flag honors explicit offExpected behavior: isFeatureEnabled('new_billing', { NEW_BILLING: 'false' }) === false · actual behavior: isFeatureEnabled('new_billing', { NEW_BILLING: 'false' }) === true

Progress

1Reproduce the bugRun checks

2Edit the fixOpen

3Pass checksOpen

4Submit fixOpen

Reproduction Steps

Run npm test.
Trace how the flag value is parsed from the environment object.
Compare the helper's behaviour for the strings 'true' and 'false'.
Make the smallest correction that respects an explicit off switch.

Focus Mode

Start

src/flags.js

Likely area

src/flags.js

Challenge Coach

Hints reveal broad direction first, then narrow toward the suspect path without showing hidden tests or exact solution code.

TopicConfig & Environment

DifficultyEasy

Est. time12 min

Workspacepreparing

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Evidence Map

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workspace

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