THRIFT-5109 Misc Cmake build improvements
Patch: Mario Emmenlauer

This closes #2094
diff --git a/lib/js/CMakeLists.txt b/lib/js/CMakeLists.txt
new file mode 100644
index 0000000..c312a21
--- /dev/null
+++ b/lib/js/CMakeLists.txt
@@ -0,0 +1,52 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+if(NOT JAVASCRIPT_INSTALL_DIR)
+    if(IS_ABSOLUTE "${LIB_INSTALL_DIR}")
+        set(JAVASCRIPT_INSTALL_DIR "${LIB_INSTALL_DIR}/js")
+    else()
+        set(JAVASCRIPT_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/${LIB_INSTALL_DIR}/js")
+    endif()
+endif()
+
+if(IS_ABSOLUTE "${DOC_INSTALL_DIR}")
+    set(JAVASCRIPT_DOC_INSTALL_DIR "${DOC_INSTALL_DIR}/js")
+else()
+    set(JAVASCRIPT_DOC_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/${DOC_INSTALL_DIR}/js")
+endif()
+
+add_custom_target(ThriftJavascriptPreDeps ALL
+    COMMENT "Installing Javascript dependencies using npm"
+    DEPENDS copy-thrift-compiler
+    COMMAND npm install
+    WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+)
+
+add_custom_target(ThriftJavascript ALL
+    COMMENT "Building Javascript library using npx Grunt wrapper"
+    DEPENDS ThriftJavascriptPreDeps
+    COMMAND npx grunt
+    WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+)
+
+install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/dist/"
+        DESTINATION "${JAVASCRIPT_INSTALL_DIR}"
+        FILES_MATCHING PATTERN "thrift*.js")
+install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/doc/"
+        DESTINATION "${JAVASCRIPT_DOC_INSTALL_DIR}")