Source/JavaScriptCore/runtime/ModuleMap.h

/*
 * Copyright (C) 2026 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#pragma once

#include <JavaScriptCore/ScriptFetchParameters.h>

#include <wtf/HashMap.h>

namespace JSC {

using ModuleMapKey = std::pair<UniquedStringImpl*, ScriptFetchParameters::Type>;

struct ModuleMapHash {
    static unsigned hash(const ModuleMapKey& key)
    {
        unsigned identifierHash = key.first ? key.first->existingSymbolAwareHash() : 0;
        unsigned enumHash(key.second);
        return WTF::pairIntHash(identifierHash, enumHash);
    }

    static bool equal(const ModuleMapKey& a, const ModuleMapKey& b)
    {
        return a.first == b.first && a.second == b.second;
    }

    static constexpr bool safeToCompareToEmptyOrDeleted = false;
};

template <typename T>
using ModuleMap = UncheckedKeyHashMap<ModuleMapKey, T, ModuleMapHash>;

using ResolutionMapKey = std::pair<UniquedStringImpl*, UniquedStringImpl*>;

struct ResolutionMapHash {
    static unsigned hash(const ResolutionMapKey& key)
    {
        unsigned referrerHash = key.first ? key.first->existingSymbolAwareHash() : 0;
        unsigned specifierHash = key.second ? key.second->existingSymbolAwareHash() : 0;
        return WTF::pairIntHash(referrerHash, specifierHash);
    }

    static bool equal(const ResolutionMapKey& a, const ResolutionMapKey& b)
    {
        return a.first == b.first && a.second == b.second;
    }

    static constexpr bool safeToCompareToEmptyOrDeleted = false;
};

template <typename T>
using ResolutionMap = UncheckedKeyHashMap<ResolutionMapKey, T, ResolutionMapHash>;

} // namespace JSC