Function is_encoding

modules/llrt_buffer/src/buffer.rs:319–326

(value: Value)

                );
            }
        }
    }

    if let Some(string) = get_coerced_string(&value) {
        return Buffer::from_string_encoding(&ctx, string, encoding)?.into_js(&ctx);
    }

    Err(Exception::throw_message(
        &ctx,
        "value must be typed DataView, Buffer, ArrayBuffer, Uint8Array or interpretable as string",
    ))