FIX: Old Chromium doesn't emit LCP metric

.gitignore

@@ -1,2 +1,4 @@
 .idea
-*.iml
+*.iml
+.lighthouseci/*.json
+.lighthouseci/*.html

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:12.13-alpine3.10
+FROM node:12.17-alpine3.11
 
 RUN apk add --no-cache chromium
 RUN npm install -g @lhci/cli@0.4.0
@@ -10,5 +10,9 @@ RUN addgroup lhci \
     --home /home/lhci \
     --ingroup lhci \
     lhci
+
 USER lhci
 WORKDIR /home/lhci
+
+RUN mkdir .lighthouseci
+VOLUME .lighthouseci

README.md

@@ -15,6 +15,13 @@ Docker image for [Lighthouse CI CLI](https://github.com/GoogleChrome/lighthouse-
 
 ## Usage
 
+### Locally
+
+```
+docker run -it --rm -v $(pwd)/example:/home/lhci/example -v $(pwd)/.lighthouseci:/home/lhci/.lighthouseci  lhci lhci --config ./example/lighthouserc.example.yaml autorun
+```
+
+### In CI Pipeline
 We are using this image in our Bitbucket Pipeline as a step to run LH tests and then upload results to 
 Google Cloud Storage.
 

example/lighthouserc.example.yaml

@@ -0,0 +1,15 @@
+ci:
+  collect:
+    additive: false
+    url:
+      - https://pixboost.com
+    settings:
+      chrome-flags: "--no-sandbox --headless"
+      throttling-method: simulate
+      # https://github.com/GoogleChrome/lighthouse/blob/8f500e00243e07ef0a80b39334bedcc8ddc8d3d0/lighthouse-core/config/constants.js#L19-L26
+      throttling:
+        throughputKbps: 1638
+        uploadThroughputKbps: 675
+        cpuSlowdownMultiplier: 4
+  assert:
+    preset: lighthouse:no-pwa