kotlin-electron/karakum/src/jsMain/kotlin/electron/karakum/injections/BrowserEventInjection.kt [173:210]:
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    private val events = mutableMapOf<Symbol, MutableMap<String, ReadonlyArray<ParameterDeclaration>>>()

    override fun setup(context: Context) = Unit

    override fun traverse(node: Node, context: Context) = impure {
        ensure(isStringLiteral(node))

        val eventContainer = ensureNotNull(extractEventContainer(node))
        val eventPayload = ensureNotNull(extractEventPayload(node, context))

        val name = ensureNotNull(eventContainer.name)

        val typeScriptService = ensureNotNull(context.lookupService(typeScriptServiceKey))
        val typeChecker = typeScriptService.program.getTypeChecker()

        val symbol = ensureNotNull(typeChecker.getSymbolAtLocation(name))

        val symbolEvents = events[symbol] ?: mutableMapOf()

        symbolEvents[node.text] = eventPayload

        events[symbol] = symbolEvents
    }

    override fun render(node: Node, context: Context, next: Render<Node>) = nullable {
        val method = ensureNotNull(
            nullable {
                ensure(isMethodDeclaration(node))
                node
            } ?: nullable {
                ensure(isMethodSignature(node))
                node
            }
        )

        val name = ensureNotNull(method.name)
        ensure(isIdentifier(name))
        ensure(name.text in eventHandlerMethods)
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kotlin-electron/karakum/src/jsMain/kotlin/electron/karakum/injections/EventInjection.kt [245:282]:
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    private val events = mutableMapOf<Symbol, MutableMap<String, ReadonlyArray<ParameterDeclaration>>>()

    override fun setup(context: Context) = Unit

    override fun traverse(node: Node, context: Context) = impure {
        ensure(isStringLiteral(node))

        val eventContainer = ensureNotNull(extractEventContainer(node))
        val eventPayload = ensureNotNull(extractEventPayload(node, context))

        val name = ensureNotNull(eventContainer.name)

        val typeScriptService = ensureNotNull(context.lookupService(typeScriptServiceKey))
        val typeChecker = typeScriptService.program.getTypeChecker()

        val symbol = ensureNotNull(typeChecker.getSymbolAtLocation(name))

        val symbolEvents = events[symbol] ?: mutableMapOf()

        symbolEvents[node.text] = eventPayload

        events[symbol] = symbolEvents
    }

    override fun render(node: Node, context: Context, next: Render<Node>) = nullable {
        val method = ensureNotNull(
            nullable {
                ensure(isMethodDeclaration(node))
                node
            } ?: nullable {
                ensure(isMethodSignature(node))
                node
            }
        )

        val name = ensureNotNull(method.name)
        ensure(isIdentifier(name))
        ensure(name.text in eventHandlerMethods)
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