activate prettier via fmt:check in ci(#100)

.github/workflows/test.yml

@@ -50,13 +50,6 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node }}
-      - id: yarn-cache
-        run: echo "::set-output name=dir::$(yarn cache dir)"
-      - uses: actions/cache@v2
-        with:
-          path: ${{ steps.yarn-cache.outputs.dir }}
-          key: ${{ matrix.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
-          restore-keys: |
-            ${{ matrix.os }}-yarn-
       - run: yarn --frozen-lockfile
-      - run: yarn lint
+      - run: yarn lint
+      - run: yarn fmt:check

.prettierrc

@@ -0,0 +1,16 @@
+{
+    "plugins": ["prettier-plugin-solidity"],
+    "overrides": [
+      {
+        "files": "*.sol",
+        "options": {
+          "parser": "solidity-parse",
+          "printWidth": 80,
+          "tabWidth": 4,
+          "useTabs": false,
+          "singleQuote": false,
+          "bracketSpacing": false
+        }
+      }
+    ]
+  }

package.json

@@ -7,6 +7,7 @@
   "license": "MIT",
   "scripts": {
     "fmt": "prettier 'contracts/**/*.sol' -w && prettier 'test/**/*.sol' -w",
+    "fmt:check": "prettier 'contracts/**/*.sol' -c && prettier 'test/**/*.sol' -c",
     "lint": "solhint 'contracts/**/*.sol' 'test/**/*.sol'"
   },
   "dependencies": {