Update Typescript to 2.0 #419
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mquandalle
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Thanks for doing this! I'll check it out sometime soon. |
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Will this in any way affect people who are using Apollo Client with Typescript 1.x? |
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No, not until the types definition file is modified. With this PR, it’s just the compilation-step analysis that is enhanced, but the .js and .d.ts builds are the same. |
That's odd, since there is a |
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Hum, after some investigations, I think this is an instance of microsoft/TypeScript#7719. |
Updating graphql-tag was also required because its incorect types definition was raising errors with TS 2.0, see apollographql/graphql-tag#1. I haven’t opt-in for the `strictNullChecks` option yet, for that’s certainly something to do to get the full benefit of this new TS release.
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Looks good to go for me, gonna merge once the tests pass. |
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The soon-to-be-released v2.0 of TypeScript will bring a lot of new cool features. Cherry-picking the releases notes, I believe the apollo-client will especially benefit from the discriminated union types (microsoft/TypeScript#9163), the smarter flow analysis, and the explicit
nullandundefinedchecks.This PR updates the Typescript compiler to use the v2.0-beta. There is one logic error detected by the new flow analysis:
I haven’t opt-in the
strictNullChecksoption as I’m not that comfortable with the code base, but it sure would be great if someone else could do it.