Improve speed of JS package version checking

.travis/travis_install.sh

@@ -22,6 +22,9 @@ npm -g install npm@latest
 npm --version
 node --version
 make dependencies
+echo "The following report indicates Javascript packages that are eligible"
+echo "  for updates:"
+make check-js-updates
 section_end "install.cesium_web.requirements"
 
 

Makefile

@@ -12,7 +12,7 @@ dev_dependencies:
 
 dependencies:
 	@./tools/install_deps.py requirements.txt
-	npm update
+	@./tools/check_js_deps.sh
 
 db_init:
 	./tools/db_create.sh
@@ -66,6 +66,10 @@ docker-images:
 	docker build -t cesium/web . && docker push cesium/web
 	cd docker/postgres && docker build -t cesium/postgres . && docker push cesium/postgres
 
-npm-update:
-	npm install -g npm-check-updates
-	ncu
+# Call this target to see which Javascript dependencies are not up to date
+check-js-updates:
+	@if [[ ! -x ./node_modules/.bin/npm-check-updates ]]; then \
+		npm install npm-check-updates > /dev/null 2>&1; \
+	fi
+	@ncu
+

README.md

@@ -78,6 +78,8 @@ Debugging:
 - Run `make log` to watch log output
 - Run `make debug` to start webserver in debug mode
 - Run `make attach` to attach to output of webserver, e.g. for use with `pdb.set_trace()`
+- Run `make check-js-updates` to see which Javascript packages are eligible
+  for an upgrade.
 
 ## Standards
 

tools/check_js_deps.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -e
+
+CHECKER='./node_modules/.bin/check-dependencies'
+
+if [[ ! -x ${CHECKER} ]]; then
+    npm install check-dependencies > /dev/null 2>&1
+fi
+
+# We suppress output for the next command because, annoyingly, it reports
+# that a dependency is unsatisfied even if the --install flag is specified,
+# and that package has been successfully installed
+${CHECKER} --install > /dev/null 2>&1
+
+# Print report, if any unsatisfied dependencies remain
+if ${CHECKER}; then
+    echo "✓ All Javascript dependencies satisfied."
+fi