For a quick tutorial about installing Oracle module for Nodejs (oracledb) on Suse SLES, follow the info at Node-OracleDB Installation but remember to use the gcc compiler release 5.0```
export ORACLE_HOME=/home/oracle/instantclient_12_1
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ORACLE_HOME
export TNS_ADMIN=$ORACLE_HOME
export OCI_LIBRARY_PATH=$ORACLE_HOME
export OCI_LIB_DIR=$ORACLE_HOME
export OCI_INC_DIR=$ORACLE_HOME/sdk/include
CC=gcc-5 CXX=g++-5 npm install oracledb
```