How do you make environment variables that you are...
# helpd
Damjan
04/15/2022, 2:11 PMHow do you make environment variables that you are passing into lambdas type safe and IDE-completeable ?
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Ross Coundon
04/15/2022, 2:15 PMIf you're using nodejs, they're always just strings so you can define them in a nodejs/process.d.ts file. In there you can specify some string literal formats.
For example we define a StringBoolean and StringNumber
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Damjan
04/15/2022, 2:17 PMThe issue with that though is that you end up defining env variables that are not available in every function, and it gets hard to track what is required and passed in
Damjan
04/15/2022, 2:17 PMthere’s no safety
Damjan
04/15/2022, 2:18 PMwe read secrets from SSM, I’m more asking for references to other resources that are created
Damjan
04/15/2022, 2:18 PMwebhook -> sqs -> function1
Damjan
04/15/2022, 2:19 PMsqs name is only used in webhook function, so why add it to all functions
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thdxr
04/15/2022, 2:23 PMwe actually have a PR that code gens types for you haha
thdxr
04/15/2022, 2:23 PMhaven't merged it yet
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Ross Coundon
04/15/2022, 2:23 PMI suppose you could define a specific environment type for each function that extends Record <string, string> but haven't tried it personally
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thdxr
04/15/2022, 2:23 PMalso we're working on an sst.Parameter concept that'll store in SSM and also codegen types so you can access it safely
thdxr
04/15/2022, 2:24 PMThe issue of scoping the types to the specific function is unfortunately an impossible problem to solve
thdxr
04/15/2022, 2:25 PMYou might be able to scope it to a single file but a function can call code from any other file and there's no mechanism in TS to keep track of this
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Damjan
04/15/2022, 2:26 PMYeah, the best I came up with is to push it to ssm and read from there, but it is still the same thing of it not being scoped
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thdxr
04/15/2022, 2:26 PMMy approach has been putting everything in SSM, giving functions specific access, and if during their execution they try to access something they don't have access to it'll throw a runtime exception.
I'm also playing with a static analyzer that will warn you sort of the same way you get type errors
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Damjan
04/15/2022, 2:28 PMNice 👍 I do think reading from ssm is better ‘worse’ solution to not having any type safety at all
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