coverage script

package.json

@@ -10,7 +10,7 @@
   "scripts": {
     "compile": "hardhat compile",
     "compile:harnesses": "env SRC=./certora/harnesses hardhat compile",
-    "coverage": "env COVERAGE=true hardhat coverage && FOUNDRY_FUZZ_RUNS=10 forge coverage --report lcov && lcov -o lcov.info --remove lcov.info 'test/*' 'contracts/mocks/*' && awk '!/,0/' lcov.info > temp && mv temp lcov.info",
+    "coverage": "scripts/checks/coverage.sh",
     "docs": "npm run prepare-docs && oz-docs",
     "docs:watch": "oz-docs watch contracts docs/templates docs/config.js",
     "prepare": "git config --local core.hooksPath .githooks",

scripts/checks/coverage.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+export COVERAGE=true
+export FOUNDRY_FUZZ_RUNS=10
+
+# Hardhat coverage
+npx hardhat coverage
+
+# Foundry coverage
+forge coverage --report lcov
+# Remove test and mock data
+lcov --rc derive_function_end_line=0 -o lcov.info --remove lcov.info 'test/*' 'contracts/mocks/*'
+# Remove zero hits
+awk '!/,0/' lcov.info > temp && mv temp lcov.info
+
+# Reports are then uploaded to Codecov automatically by workflow, and merged.