Cloudflare Developers•6mo ago

Your worker created multiple branches of a single stream (for instance, by calling response.clone()

I am getting this when trying to use a cloudflare worker together with the uploadthing library. I have debugged in VS-code and the error is thrown here when uploadthing library calls the safeParseJSON function: https://github.com/pingdotgg/uploadthing/blob/ea0f3c96f5db2fa945592d5efc06bf84811c5525/packages/shared/src/utils.ts#L233 Here is link to my cloudflare worker: https://github.com/kristiankauffeld/uploadthing-cf-worker

4 Replies

kian•6mo ago

Seems like a valid warning - it clones but only tries to read the second branch in the event of an error.

kristiankauffeld•6mo ago

@kian it throws the warning even though I commented the cloning part out:

export async function safeParseJSON<T>(
    input: string | ResponseEsque | RequestLike,
): Promise<T | Error> {
    if (typeof input === "string") {
        try {
            return JSON.parse(input) as T;
        } catch (err) {
            console.error(`Error parsing JSON, got '${input}'`);
            return new Error(`Error parsing JSON, got '${input}'`);
        }
    }

    //const clonedRes = input.clone?.();
    try {
        return (await input.json()) as T;
    } catch (err) {
        //const text = (await input?.text()) ?? "unknown";
        //const text = await input?.text()) ?? "unknown";
        //console.error(`Error parsing JSON, got '${text}'`);
        return new Error(`Error parsing JSON, got '${input}'`);
    }
}

export async function safeParseJSON<T>(
    input: string | ResponseEsque | RequestLike,
): Promise<T | Error> {
    if (typeof input === "string") {
        try {
            return JSON.parse(input) as T;
        } catch (err) {
            console.error(`Error parsing JSON, got '${input}'`);
            return new Error(`Error parsing JSON, got '${input}'`);
        }
    }

    //const clonedRes = input.clone?.();
    try {
        return (await input.json()) as T;
    } catch (err) {
        //const text = (await input?.text()) ?? "unknown";
        //const text = await input?.text()) ?? "unknown";
        //console.error(`Error parsing JSON, got '${text}'`);
        return new Error(`Error parsing JSON, got '${input}'`);
    }
}

kian•6mo ago

Look for other usages of clone

kristiankauffeld•6mo ago

the only other place I can find a usage of clone is here, but the warning is thrown before this is reached: https://github.com/pingdotgg/uploadthing/blob/ea0f3c96f5db2fa945592d5efc06bf84811c5525/packages/uploadthing/src/sdk/utils.ts#L85

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Your worker created multiple branches of a single stream (for instance, by calling response.clone()