Error: 'buffer error' that probably came from NodeJS

[jcubic]

I have this issue in isomorphic-git isomorphic-git/isomorphic-git#1833

The library throw an error that don't appear in the source code. The error is a string and it's probably is throwed by NodeJS. I was searching for the string (GitHub didn't show anything so it's useless) it points to V8:

z_const char * const z_errmsg[10] = {
    (z_const char *)"need dictionary",     /* Z_NEED_DICT       2  */
    (z_const char *)"stream end",          /* Z_STREAM_END      1  */
    (z_const char *)"",                    /* Z_OK              0  */
    (z_const char *)"file error",          /* Z_ERRNO         (-1) */
    (z_const char *)"stream error",        /* Z_STREAM_ERROR  (-2) */
    (z_const char *)"data error",          /* Z_DATA_ERROR    (-3) */
    (z_const char *)"insufficient memory", /* Z_MEM_ERROR     (-4) */
    (z_const char *)"buffer error",        /* Z_BUF_ERROR     (-5) */
    (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
    (z_const char *)""
};

$ git grep 'buffer error'
deps/v8/third_party/zlib/zlib.h:   case -- and inflateBack() will return a buffer error.  inflateBack() will
deps/v8/third_party/zlib/zutil.c:    (z_const char *)"buffer error",        /* Z_BUF_ERROR     (-5) */
deps/zlib/zlib.h:   case -- and inflateBack() will return a buffer error.  inflateBack() will
deps/zlib/zutil.c:    (z_const char *)"buffer error",        /* Z_BUF_ERROR     (-5) */

Not sure why zutil.c is twice in the source code.

Do know what this error is about?

[bnoordhuis]

Z_BUF_ERROR usually means the input or output buffer is empty (ex: zlib.inflateSync(Buffer.from([]))). It's non-fatal, you can resume afterwards.