Add support for LOG_LEVEL env variable

README.md

@@ -70,6 +70,16 @@ When creating a _child_ logger you may also override the default `simple` behavi
 const logger = require('debugnyan')('foo', {}, { suffix: 'module', simple: false });
 ```
 
+### Log level
+
+The `level` bunyan option is respected if the logger output is active.
+
+```js
+const logger = require('debugnyan')('foo', { level: 'info' });
+```
+
+You may also set the log level via the `LOG_LEVEL` environment variable. However, the `level` option will always take precedence over it.
+
 ## Tests
 
 ```

index.js

@@ -43,7 +43,8 @@ module.exports = function debugnyan(name, options, { prefix = 'sub', simple = tr
   }
 
   if (debug.enabled(name)) {
-    loggers[name].level(options?.level ?? bunyan.DEBUG);
+    // eslint-disable-next-line no-process-env
+    loggers[name].level(options?.level ?? process.env.LOG_LEVEL ?? bunyan.DEBUG);
   }
 
   return loggers[name];

test/index.test.js

@@ -1,3 +1,5 @@
+/* eslint-disable no-process-env */
+
 /**
  * Module dependencies.
  */
@@ -7,6 +9,10 @@ const debug = require('debug');
 const debugnyan = require('..');
 
 describe('debugnyan', () => {
+  beforeEach(() => {
+    delete process.env.LOG_LEVEL;
+  });
+
   it('should return an instance of a bunyan logger', () => {
     const logger = debugnyan('foo');
 
@@ -48,14 +54,24 @@ describe('debugnyan', () => {
     expect(logger.level()).toEqual(Logger.DEBUG);
   });
 
-  it('should be on the specified level if `DEBUG` matches logger name', () => {
+  it('should be on the specified level via `options.level` if `DEBUG` matches logger name', () => {
     debug.enable('abc');
+    process.env.LOG_LEVEL = 'info';
 
     const logger = debugnyan('abc', { level: 'warn' });
 
     expect(logger.level()).toEqual(Logger.WARN);
   });
 
+  it('should be on the specified level via `process.env.LOG_LEVEL` if `DEBUG` matches logger name', () => {
+    debug.enable('abc');
+    process.env.LOG_LEVEL = 'warn';
+
+    const logger = debugnyan('abc');
+
+    expect(logger.level()).toEqual(Logger.WARN);
+  });
+
   describe('namespacing', () => {
     it('should support multiple components separated by colons', () => {
       const logger = debugnyan('foo:bar:biz:qux');