Error message when passing input as a Buffer.

[AdleyJulian]

I had thought that the output was optional for the Node API usage like in the CLI.

I kept getting the message "Error: undefined is required when passing image as buffer". There's a check for the output file name if the input is a buffer.

I think this should be replaced

        if (Buffer.isBuffer(input)) {
            if (!outputFileName) {
                throw new Error(`${outputFileName} is required when passing image as buffer`);
            }

with this

        if (Buffer.isBuffer(input)) {
            if (!outputFileName) {
                throw new Error("OutputFileName is required when passing image as buffer");
            }

[axe312ger]

Can you provide a pull request please?

[axe312ger]

This is fixed and released :)