SyntaxVisitor

syntax-visitor.swift

import SwiftSyntax

class FindPublicExtensionDeclVisitor: SyntaxVisitor {
    override func visit(_ node: ExtensionDeclSyntax) -> SyntaxVisitorContinueKind {
        if node.modifiers?.contains(where: { $0.name.tokenKind == .publicKeyword }) == true {
            // Do something if you find a `public extension` declaration.
        }
        return SyntaxVisitorContinueKind.skipChildren
    }
}