Component.name optimized: replace String(describing:) with _typeName
#489
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@rudro Hi, Rudro! This PR will significantly improve performance for large apps. If this PR matches your expectations, I'd appreciate your guidance on how we can proceed with merging the PR. Thanks in advance! |
listrophy
reviewed
Jan 31, 2026
| let parts = fullyQualifiedSelfName.components(separatedBy: ".") | ||
| return parts.last ?? fullyQualifiedSelfName | ||
| }() | ||
| private lazy var name: String = _typeName(type(of: self), qualified: false) |
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This is wonderful, but it uses a private API. Up to the maintainers to decide if that's ok
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It's not truly private API. This function is public but not documented.
Moreover, it can be accessed indirectly by calling regular string interpolation. Like "\(type(of: self))"
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Previously,
String(describing: self)was used to get fully qualified name (including module name).But using
String(describing: self)to get type name is extremely ineffective (see #486 and swiftlang/swift#77369). In the endString(describing:)calls_typeName(:qualified:)function. Also, if we passqualified: false, we don't need to do any splitting workPrevious callstack when using
String(describing:):