A provider outage can expose how deeply application code depends on a single feature-flag SDK.

A provider outage can expose how deeply application code depends on a single

feature-flag SDK. OpenFeature creates a neutral application boundary without

forcing teams to abandon LaunchDarkly.

This article walks through the local audit, migration preview, and CI enforcement

path that lets teams add that boundary incrementally.

The Vendor Lock-In Problem

Direct SDK calls look like this:

import LaunchDarkly from 'launchdarkly-node-server-sdk';

const ldClient = LaunchDarkly.init(process.env.LD_SDK_KEY);



const enabled = await ldClient.boolVariation('checkout-v2', ctx, false);

Your application code is coupled to LaunchDarkly's API surface.

Switching providers means rewriting every evaluation call.

OpenFeature decouples this. Your application calls the OpenFeature API.

The provider (LaunchDarkly, or anything else) is a configuration detail.

The Migration That Stalls

Most teams agree to add OpenFeature. Most migrations take 6+ weeks

and nearly break production at least once.

The reasons:

• No inventory of where direct SDK calls live


• Argument-order differences cause subtle production bugs


• Phased migrations partially reverse when new engineers join


• No CI enforcement to prevent new direct calls

One of those reasons is an API difference that breaks even careful rewrites —


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Originally published at flaglint.dev