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Fix Lambda context function typing #5481

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Jul 15, 2021
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@glasser glasser commented Jul 14, 2021

In AS3 we made apollo-server-lambda inherit from apollo-server-express,
but didn't realize that it also inherited the more precise TS typings on
its constructor that meant that its context function would take
Express-specific parameters (rather than the default unconstrained
parameter).

This change makes it easier for any ApolloServer subclass to declare its
context function typing, and updates apollo-server-express and
apollo-server-lambda to do so. The other integrations are left with the
vaguer defaults.

Tests didn't catch this before because they didn't pass a context
function directly to the Lambda ApolloServer constructor, just via a
function with a looser signature.

Fixes #5480.

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Shared some concerns offline about ProducedContext === TContext, just noting for awareness but I don't propose we do anything about threading TContext correctly in this PR. I do think there are some places it can be improved upon quite a bit!

CHANGELOG.md Outdated
@@ -9,6 +9,8 @@ The version headers in this history reflect the versions of Apollo Server itself

## vNEXT

- `apollo-server-lambda`: Fix TypeScript types for `context` function. (In 3.0.0, the TS types for the `context` function were accidentally inherited from `apollo-server-express` instead of using the correct Lambda-specific types). [PR #XXXX](https://github.com/apollographql/apollo-server/pull/XXXX)
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Suggested change
- `apollo-server-lambda`: Fix TypeScript types for `context` function. (In 3.0.0, the TS types for the `context` function were accidentally inherited from `apollo-server-express` instead of using the correct Lambda-specific types). [PR #XXXX](https://github.com/apollographql/apollo-server/pull/XXXX)
- `apollo-server-lambda`: Fix TypeScript types for `context` function. (In 3.0.0, the TS types for the `context` function were accidentally inherited from `apollo-server-express` instead of using the correct Lambda-specific types). [PR #5481](https://github.com/apollographql/apollo-server/pull/5481)

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Thanks, applied directly.

@glasser glasser force-pushed the glasser/lambda-context-fix branch 2 times, most recently from 79ca410 to 758450c Compare July 15, 2021 05:36
In AS3 we made apollo-server-lambda inherit from apollo-server-express,
but didn't realize that it also inherited the more precise TS typings on
its constructor that meant that its `context` function would take
Express-specific parameters (rather than the default unconstrained
parameter).

This change makes it easier for any ApolloServer subclass to declare its
context function typing, and updates apollo-server-express and
apollo-server-lambda to do so. The other integrations are left with the
vaguer defaults.

Tests didn't catch this before because they didn't pass a `context`
function *directly* to the Lambda ApolloServer constructor, just via a
function with a looser signature.

An earlier version of this PR attempted to add the context object type
(ie TContext) to the ApolloServer generics as well. But it didn't
actually connect through to the TContext on processHTTPRequest and
trying to link those up ran into some technical issues, so I decided to
leave it out.

Fixes #5480.
@glasser glasser force-pushed the glasser/lambda-context-fix branch from 758450c to 3310405 Compare July 15, 2021 05:36
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glasser commented Jul 15, 2021

Rather than add a TContext generic that isn't actually connected to the one used when actually calling the context function, I ended up removing it. Trying to connect them ran into various issues (like the default value of {} for context used when no context is provided not working because it clearly isn't correct for arbitrary context types).

@glasser glasser merged commit 928f709 into main Jul 15, 2021
@glasser glasser deleted the glasser/lambda-context-fix branch July 15, 2021 05:43
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glasser commented Jul 16, 2021

Fix released in 3.0.1.

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AS3 apollo-server-lambda context callback parameter TS types are wrong
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