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Ignore BOM when lexing #3908

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tobias-tengler
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If a GraphQL schema file should be encoded as UTF-8 with BOM, the lexer will skip the BOM (\ufeff) character.

I've also added a regression snapshot test.

Closes #3798

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@captbaritone has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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Rather than a snapshot test (where the BOM is very easy to overlook) could we create a unit test that uses an explicit escaped string?

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Rather than a snapshot test (where the BOM is very easy to overlook) could we create a unit test that uses an explicit escaped string?

Done :)
I moved my test out of the schema document parsing tests and added it as a unit test directly to the lexer tests. I hope that's alright!

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@captbaritone has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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[V13] UTF-8 with BOM encoded schema file causes 'unsupported character' compiler error
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