Change to hardhat

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

.github/workflows/lint.yml

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+name: Lint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  run-linters:
+    name: Run linters
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v2
+
+      - name: Set up node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 16
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Run linters
+        run: yarn lint

.github/workflows/tests.yml

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+name: Tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  unit-tests:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 16
+
+      - id: yarn-cache
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+
+      - uses: actions/cache@v1
+        with:
+          path: ${{ steps.yarn-cache.outputs.dir }}
+          key: yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            yarn-
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      # This is required separately from yarn test because it generates the typechain definitions
+      - name: Compile
+        run: yarn compile
+
+      - name: Run unit tests
+        run: yarn test

.gitignore

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+abi/
+artifacts/
+cache/
+coverage/
+exports/
+node_modules/
+typechain/
+package-lock.json
+coverage.json
+.env
+.DS_Store
+/deployments/*/.chainId
+/deployments/*/solcInputs
+/.env

.prettierignore

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+node_modules
+artifacts
+cache
+coverage*
+gasReporterOutput.json
+package.json
+img
+.env
+.*
+README.md
+coverage.json
+deployments
+typechain

.prettierrc

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+{
+    "tabWidth": 4,
+    "useTabs": false,
+    "semi": false,
+    "singleQuote": false,
+    "printWidth": 100
+}

.solcover.js

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+module.exports = {
+    skipFiles: [],
+};

.solhint.json

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+{
+    "extends": "solhint:recommended",
+    "rules": {
+        "compiler-version": ["error", "^0.8.0"],
+        "func-visibility": ["warn", { "ignoreConstructors": true }]
+    }
+}

.solhintignore

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+node_modules
+contracts/test