lighthouse-key-metrics.sh

url=${1:-http://localhost:8080/us/rock-n-roll-dallas/sammy}
output_path="./.lighthouse/$(date +%F-%S.%M).json"

NODE_ENV=production yarn build && NODE_ENV=production yarn start > dev.log &

# may need to wait for port

yarn run lighthouse ${url} -- --output="json" --output-path="${output_path}"

kill $(lsof -i :8080 -t)

meaningful_paint=$(jq '.audits | .["first-meaningful-paint"] | .rawValue' ${output_path})
speed_index=$(jq '.audits | .["speed-index-metric"] | .rawValue' ${output_path})
first_interactive=$(jq '.audits | .["first-interactive"] | .rawValue' ${output_path})

echo "First meaningful paint (ms): ${meaningful_paint}"
echo "Speed index metric (ms): ${speed_index}"
echo "First interactive (ms): ${first_interactive}"

rm ${output_path}