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node_modules/@apollo/utils.logger/README.md

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+# Logger interface
+
+> ```
+> interface Logger {
+>   debug(message?: any): void;
+>   info(message?: any): void;
+>   warn(message?: any): void;
+>   error(message?: any): void;
+> }
+> ```
+
+This generic interface for loggers supports logging a string at one of four different levels (`debug`, `info`, `warn`, `error`). It's designed to be compatible with Node's `console` as well as commonly used logging packages and is tested against a few of them. Below are the logging libraries we test for compatibility against.
+
+## bunyan
+
+```
+const logger = bunyan.createLogger();
+```
+
+## log4js
+
+```
+const logger = log4js.getLogger();
+```
+
+## loglevel
+
+```
+const logger = loglevel.getLogger();
+```
+
+## winston
+
+```
+const logger = winston.createLogger();
+```