Send lighthouse scores to slack channel

lighthouse-slack.sh

#!/bin/sh

URL="<URL to audit>"
SLACK_URL="<Slack channel webhook URL>"
SLACK_USER="Lighthouse"

lighthouse --output json \
  --output-path ./result.json \
  --chrome-flags="--headless" \
  $URL

SCORES=`cat result.json \
  | jq -r '.categories | \
      map_values("\(.title): \(.score*100)") | \
      join(" / ")'`

PAYLOAD='{"username":"'$SLACK_USER'", "text":"'$SCORES' ('$URL')"}'

curl -X POST -d "$PAYLOAD" $SLACK_URL