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[Flight] Prevent non-Server imports of aliased Server entrypoints #20422
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Original file line number | Diff line number | Diff line change |
---|---|---|
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@@ -70,22 +70,26 @@ module.exports = function register() { | |
const originalResolveFilename = Module._resolveFilename; | ||
|
||
Module._resolveFilename = function(request, parent, isMain, options) { | ||
// We intentionally check the request here instead of the resolved file. | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. This didn’t make sense |
||
// This allows package exports to configure non-server aliases that resolve to server files | ||
// depending on environment. It's probably a bad idea to export a server file as "main" though. | ||
if (request.endsWith('.server.js')) { | ||
const resolved = originalResolveFilename.apply(this, arguments); | ||
if (resolved.endsWith('.server.js')) { | ||
if ( | ||
parent && | ||
parent.filename && | ||
!parent.filename.endsWith('.server.js') | ||
) { | ||
let reason; | ||
if (request.endsWith('.server.js')) { | ||
reason = `"${request}"`; | ||
} else { | ||
reason = `"${request}" (which expands to "${resolved}")`; | ||
} | ||
throw new Error( | ||
`Cannot import "${request}" from "${parent.filename}". ` + | ||
`Cannot import ${reason} from "${parent.filename}". ` + | ||
'By react-server convention, .server.js files can only be imported from other .server.js files. ' + | ||
'That way nobody accidentally sends these to the client by indirectly importing it.', | ||
); | ||
} | ||
} | ||
return originalResolveFilename.apply(this, arguments); | ||
return resolved; | ||
}; | ||
}; |
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Here's something funky. The actual
defaultResolve
is sync. No promise. Is it supposed to be chainable, i.e. can this return a Promise?There was a problem hiding this comment.
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That's weird. You'd expect they'd want to do that asynchronously.
But it's supposed to be chainable so you can do stuff like this:
https://github.com/facebook/react/blob/master/fixtures/flight/loader/index.js#L30