feat: wrap vercel flags #903
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ajwootto
commented
Jul 23, 2024
•
ajwootto
commented
- create a helper in Next SDK that wraps the Vercel "flag" function to make it "feature /variation" aware
- when you call the returned wrapped function with a variable key and default value, it figures out from the main config which feature that variable belongs to. It then calls the Vercel "flag" function using the feature as the "key" and obtaining a variation id for that feature
- it also provides "options" for the toolbar which are the list of variations in the feature
- this allows someone using the toolbar to select an override for a feature and its variation, which is then used to alter the values of all the variables in that feature, but the code can continue to use variable keys for evaluation
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| @@ -20,3 +22,8 @@ export const { | |||
| }, | |||
| options: { enableStreaming: false }, | |||
| }) | |||
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| export const getFlag = setupDevCycleVercelFlagHelper({ | |||
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Why as a separate import and not a part of setupDevCycle()?
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because it depends on the @vercel/flags package which I wanted to make an optional dependency. So the idea is that if you want to use it with Vercel, you install their flags package and import this helper from @devcycle/nextjs-sdk/vercel where it expects the package to be available.
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| const getFlag = flag<string | null>({ | ||
| key: featureForVariable.key, | ||
| defaultValue: null, |
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because this is serving the variation of the feature that should be used to obtain the flag value. The default for that should be "no variation" which is interpreted by the code further down as "use the variable's default"
