public processPartialEvent()

in server/aws-lsp-codewhisperer/src/language-server/chat/chatEventParser.ts [79:144]
60 lines of code
11 McCabe index (conditional complexity)

    public processPartialEvent(chatEvent: ChatResponseStream): Result<ChatResultWithMetadata, string> {
        const {
            messageMetadataEvent,
            followupPromptEvent,
            supplementaryWebLinksEvent,
            codeReferenceEvent,
            assistantResponseEvent,
            error,
            invalidStateEvent,
        } = chatEvent

        if (!this.#metric.metric.cwsprTimeToFirstChunk) {
            this.#metric.mergeWith({
                cwsprTimeToFirstChunk: this.#metric.getTimeElapsed(),
                cwsprChatTimeBetweenChunks: [],
            })
        } else {
            this.#metric.mergeWith({
                cwsprChatTimeBetweenChunks: [Date.now() - this.#lastChunkTime],
            })
        }

        this.#lastChunkTime = Date.now()

        if (error) {
            this.error = error.message
        } else if (invalidStateEvent) {
            this.error = invalidStateEvent.message ?? invalidStateEvent.reason ?? 'Invalid state'
        } else if (assistantResponseEvent?.content) {
            this.#totalEvents.assistantResponseEvent += 1
            this.body = (this.body ?? '') + assistantResponseEvent.content
        } else if (followupPromptEvent?.followupPrompt) {
            this.#totalEvents.followupPromptEvent += 1
            const { content } = followupPromptEvent.followupPrompt

            this.followUp = {
                text: ChatEventParser.FOLLOW_UP_TEXT,
                options: [
                    ...(this.followUp?.options ?? []),
                    {
                        pillText: content ?? '',
                        prompt: content ?? '',
                    },
                ],
            }
        } else if (
            supplementaryWebLinksEvent?.supplementaryWebLinks &&
            supplementaryWebLinksEvent.supplementaryWebLinks.length > 0
        ) {
            this.#totalEvents.supplementaryWebLinksEvent += 1
            const sourceLinks = supplementaryWebLinksEvent.supplementaryWebLinks.map(ChatEventParser.mapRelatedData)

            this.relatedContent = {
                ...this.relatedContent,
                content: [...(this.relatedContent?.content ?? []), ...sourceLinks],
            }
        } else if (codeReferenceEvent?.references && codeReferenceEvent.references.length > 0) {
            this.#totalEvents.codeReferenceEvent += 1
            const references = codeReferenceEvent.references.map(ChatEventParser.mapReferenceData)
            this.codeReference = [...(this.codeReference ?? []), ...references]
        } else if (messageMetadataEvent?.conversationId) {
            this.conversationId = messageMetadataEvent?.conversationId
        }

        return this.getResult()
    }