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18 changes: 16 additions & 2 deletions scripts/ui-assets.cmake
Original file line number Diff line number Diff line change
Expand Up @@ -126,8 +126,22 @@ function(npm_build out_var)
return()
endif()

if(NOT EXISTS "${UI_SOURCE_DIR}/node_modules")
message(STATUS "UI: running npm install (first time)")
# npm writes node_modules/.package-lock.json on every successful install,
# so a package-lock.json newer than this marker means node_modules is stale
set(NPM_MARKER "${UI_SOURCE_DIR}/node_modules/.package-lock.json")
set(need_install FALSE)
if(NOT EXISTS "${NPM_MARKER}")
set(need_install TRUE)
else()
file(TIMESTAMP "${UI_SOURCE_DIR}/package-lock.json" lock_ts)
file(TIMESTAMP "${NPM_MARKER}" marker_ts)
if(lock_ts STRGREATER marker_ts)
set(need_install TRUE)
endif()
endif()

if(need_install)
message(STATUS "UI: running npm install")
execute_process(
COMMAND ${NPM_EXECUTABLE} install
WORKING_DIRECTORY "${UI_SOURCE_DIR}"
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