chore:TypeScript support. (#47)

* chore:TypeScript support.

index.d.ts

@@ -0,0 +1,28 @@
+import sequelize from "sequelize";
+
+declare module 'egg' {
+
+  // extend app
+  interface Application {
+    Sequelize: sequelize;
+    model: sequelize.Sequelize;
+  }
+
+  // extend context
+  interface Context {
+    model: sequelize.Sequelize;
+  }
+
+  // extend your config
+  interface EggAppConfig {
+    sequelize: {
+      dialect: string;
+      database: string;
+      host: string;
+      port: number;
+      username: string;
+      password: string;
+    };
+  }
+
+}

package.json

@@ -13,6 +13,7 @@
     "orm"
   ],
   "dependencies": {
+    "@types/sequelize": "^4.27.14",
     "chalk": "^2.0.1",
     "sequelize": "^4.4.2",
     "sequelize-cli": "^2.7.0"