Initial setup

.github/actions/setup-env/action.yml

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+name: Setup Environment
+description: Does minimal setup of environment for a job
+
+runs:
+  using: composite
+  steps:
+    - name: Add extra required branches
+      if: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.ref != 'main' }}
+      run: git fetch origin main:main ${{ github.event.pull_request.base.ref }}:${{ github.event.pull_request.base.ref }}
+      shell: bash
+
+    - name: Setup node
+      uses: actions/setup-node@v4
+      with:
+        node-version-file: '.nvmrc'
+
+    - name: Restore cache
+      id: npm-cache
+      uses: actions/cache@v4
+      with:
+        path: '**/node_modules'
+        key: ${{ hashFiles('**/package-lock.json') }}
+
+    - name: Install dependencies
+      if: steps.npm-cache.outputs.cache-hit != 'true'
+      run: npm ci
+      shell: bash

.github/workflows/CI_Checks.yml

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+name: Checks on CI
+
+# Will limit one workflow per branch and one per pull_request at the same time
+# and cancel if a new one appears.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.event_name }}
+  cancel-in-progress: true
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  code_checks:
+    name: Code Styling check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.ref }}
+
+      - name: Setup env
+        uses: ./.github/actions/setup-env
+
+      - name: Check formatting
+        run: npm run format:check
+
+      - name: Check linting
+        run: npm run lint
+  tests:
+    name: Tests checks
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.ref }}
+
+      - name: Setup env
+        uses: ./.github/actions/setup-env
+
+      - name: Run test
+        run: npm run test

.gitignore

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+.eslintcache
+.nyc_output
+coverage
+dist
+lerna-debug.log
+node_modules
+tsconfig.tsbuildinfo

.nvmrc

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+20

README.md

@@ -1,2 +1,7 @@
 # eth-packages
+
 A collection of small and useful packages eth-related we use across many of our solutions
+
+## Packages
+
+- [`eth-rpc-cache`](./packages/eth-rpc-cache): A simple cache for Ethereum JSON-RPC requests

lerna.json

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+{
+  "$schema": "node_modules/lerna/schemas/lerna-schema.json",
+  "packages": ["packages/*"],
+  "version": "independent"
+}