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backend/node_modules/abstract-logging/Readme.md

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+# abstract-logging
+
+This module provides an interface for modules to include so that they can
+support logging via an external logger that conforms to the standard Log4j
+interface. One such logger is [Pino](https://npm.im/pino). This module
+is intended for modules that are meant to be used by other modules.
+
+Example:
+
+```js
+'use strict'
+
+function AwesomeLibrary (options) {
+  this.log = (options.logger) ? options.logger : require('abstract-logging')
+}
+
+AwesomeLibrary.prototype.coolMethod = function () {
+  this.log.trace('AwesomeLibrary.coolMethod was invoked')
+  return {}
+}
+
+module.exports = AwesomeLibrary
+```
+
+## Interface
+
+Available methods:
+
++ `fatal`
++ `error`
++ `warn`
++ `info`
++ `debug`
++ `trace`
+
+All methods are no operation functions.
+
+Some loggers, like [Pino](https://getpino.io/), implement a `child()` method. This method can be easily added to an `abstract-logging` instance when stubbing out such loggers:
+
+```js
+const logger = require('abstract-logging')
+logger.child = () => logger
+```
+
+## License
+
+[MIT License](http://jsumners.mit-license.org/)