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Feature values always have type string when using local evaluation mode

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#146 0 comments 2 reactions 0 assignees View on GitHub

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
42/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
nodejs, typescript
Domain
backend

Research direction

Start with the Flagsmith client path exercised by getEnvironmentFlags() and getFlag() when enableLocalEvaluation is true, using the provided TypeScript script to reproduce the differing value types. Compare the local-evaluation result with the API result and verify that numeric feature values retain their number type in both modes.

Written by the indexing model from the issue text.

Description

We've started seeing an issue where number values like this one are being returned as type string when enableLocalEvaluation is set to true.
Screenshot 2024-03-01 at 11 38 49

Using this test script I've validated that the local evaluation causes the change in behaviour (thanks Matt for the help 🙌 )

This has been tested on flagsmith-nodejs versions 2.5.1 and 3.2.0

import Flagsmith from 'flagsmith-nodejs';

async function main(): Promise<void> {
    const flagClient = new Flagsmith({
        environmentKey: 'ser.key',
        enableLocalEvaluation: true,
        enableAnalytics: false,
    });

    const environmentFlags = await flagClient.getEnvironmentFlags();
    const flag = environmentFlags.getFlag('daisy.settlements.timeout');
    console.log(`flagClient.apiUrl=${flagClient.apiUrl}`);
    console.log(`flagClient.enableLocalEvaluation=${flagClient.enableLocalEvaluation}`);
    console.log(JSON.stringify(flag));
    console.log(`typeof flag.value=${typeof flag.value}`);

    await flagClient.close();
}

void main();

enableLocalEvaluation=true

flagClient.apiUrl=https://edge.api.flagsmith.com/api/v1/
flagClient.enableLocalEvaluation=true
{"value":"60000","enabled":true,"isDefault":false,"featureId":62178,"featureName":"daisy.settlements.timeout"}
typeof flag.value=string

enableLocalEvaluation=false

flagClient.apiUrl=https://edge.api.flagsmith.com/api/v1/
flagClient.enableLocalEvaluation=false
{"value":60000,"enabled":true,"isDefault":false,"featureId":62178,"featureName":"daisy.settlements.timeout"}
typeof flag.value=number
Dominant language
TypeScript
Stars
30
Forks
27
Avg merge
20h 52m
Merged PRs (30d)
6

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