Error: template OperationDefinition(SS) does not have property sizeof

[timotheecour]

dub build
Performing "debug" build using dmd for x86_64.
graphql-d ~master: building configuration "application"...
source/language/lexer.d(65,8): Deprecation: instead of C-style syntax, use D-style syntax string[TokenKind.max + 1] tokenDescription
source/lib/std.serialization/std/serialization/json.d(324,44): Deprecation: Built-in hex string literals are deprecated, use std.conv.hexString instead.
/Users/timothee/homebrew/opt/dmd/include/dlang/dmd/std/variant.d(87,39): Error: template OperationDefinition(SS) does not have property sizeof