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Add typings for process.env #5557

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Oct 24, 2018
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@brunolemos brunolemos commented Oct 24, 2018

Babel doesn't support namespaces like export namespace App {}, but it does seem to support export declare namespace App {} or extending an existing namescape inside a declaration file (.d.ts) like we are doing here. Everything seems to work fine for this use case. (related)

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Timer commented Oct 24, 2018

What about user defined REACT_APP_ vars? Can we fall back to { [key: string]: string | undefined }?
Also, test is a valid env.

@Timer Timer added this to the 2.1 milestone Oct 24, 2018
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Timer commented Oct 24, 2018

Does this merge friendly if the user installs @types/node?

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brunolemos commented Oct 24, 2018

What about user defined REACT_APP_ vars? Can we fall back to { [key: string]: string | undefined }? Also, test is a valid env.

Added.

Does this merge friendly if the user installs @types/node?

Yes, just tested and worked as normal. It's because this code is extending an existing type, not creating or replacing completely

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Timer commented Oct 24, 2018

I dunno what process.browser is for, we def don't support that. If we do, it's by accident and isn't covered by our semver guarantee. Can we remove that type please?

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brunolemos commented Oct 24, 2018

@Timer removed. It's added by webpack, it will probably be always true with cra because there's no ssr support right

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Timer commented Oct 24, 2018

@brunolemos ah, yeah, webpack is an implementation detail and we regularly bump major versions of webpack in patches. One day, we might not even use webpack -- so I don't want to rely on this.

@brunolemos brunolemos changed the title Add typings for process.browser and process.env Add typings for process.env Oct 24, 2018
@Timer Timer merged commit 68a3735 into facebook:master Oct 24, 2018
chanand pushed a commit to chanand/create-react-app that referenced this pull request Oct 25, 2018
zmitry pushed a commit to zmitry/create-react-app that referenced this pull request Oct 29, 2018
nate770 pushed a commit to ONTW/create-react-app that referenced this pull request Oct 30, 2018
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