[THU-41]: new directive @log

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 dist
 bundle
+*.log

README.md

@@ -21,6 +21,8 @@ Simple utility library for custom GraphQL schema directives
   - [@cache](#cache)
     - [Overriding in-memory cache](#overriding-in-memory-cache)
   - [@currency](#currency)
+  - [@log](#log)
+    - [Logging to file](#logging-to-file)
 
 # Get started
 
@@ -222,3 +224,45 @@ type Car {
 The field can either be resolved with scalar types `String` or `Float`
 
 The valid currency codes to use as part of the directive's arguments can be found [here](./src/types.ts).
+
+## @log
+
+`logDirective({ directiveName, filePath }?: { directiveName?: string, filePath?: string })`
+
+Use the `@log` directive to log fields, queries and mutations once they are resolved.
+
+For example, this graphql schema with the directive on the query:
+
+```graphql
+  type User {
+    firstName: String
+    lastName: String 
+    age: Int 
+    amount: String
+  }
+
+  type Query {
+    user(firstName: String!): User @log(level: INFO)
+  }
+```
+
+Will log to the console in the following format:
+
+`[<TIMESTAMP>] [INFO] @log - Operation Type: query, Arguments: [{"firstName":"Eddie"}], Return Type: User`
+
+The following log levels are valid:
+
+- `INFO`
+- `DEBUG`
+- `WARN`
+- `ERROR`
+
+### Logging to file
+
+In order to migrate logs to a custom log file, you can define a filepath with the appropriate file name:
+
+```typescript
+  const { logDirectiveTypeDefs, logDirectiveTransformer } = logDirective({
+    filePath: path.join(__dirname, 'logs', 'application.log')
+  })
+```

package.json

@@ -26,15 +26,17 @@
     "build:server": "tsc --project tsconfig.server.json",
     "dev": "nodemon --project tsconfig.server.json server/index.ts",
     "lint": "eslint .",
-    "test": "jest",
+    "test": "jest --silent",
+    "test:watch": "npm run test -- --watch test/*.ts",
     "prepare": "npm run build:prod",
     "release": "semantic-release"
   },
   "dependencies": {
     "@graphql-tools/schema": "^10.0.2",
     "@graphql-tools/utils": "^10.0.13",
     "cheerio": "^1.0.0-rc.12",
-    "graphql": "^16.8.1"
+    "graphql": "^16.8.1",
+    "log4js": "^6.9.1"
   },
   "devDependencies": {
     "@apollo/server": "^4.10.0",