Skip timestampKey in Prettified Object (#120)

index.js

@@ -133,7 +133,7 @@ module.exports = function prettyFactory (options) {
       })
       line += prettifiedErrorLog
     } else {
-      const skipKeys = [messageKey, levelKey].filter(key => typeof log[key] === 'string')
+      const skipKeys = [messageKey, levelKey, timestampKey].filter(key => typeof log[key] === 'string' || typeof log[key] === 'number')
       const prettifiedObject = prettifyObject({
         input: log,
         skipKeys,

test/basic.test.js

@@ -650,5 +650,12 @@ test('basic prettifier tests', (t) => {
     log.info('foo')
   })
 
+  t.test('handles specified timestampKey', (t) => {
+    t.plan(1)
+    const pretty = prettyFactory({ timestampKey: '@timestamp' })
+    const arst = pretty(`{"msg":"hello world", "@timestamp":${epoch}, "level":30}`)
+    t.is(arst, `[${epoch}] INFO : hello world\n`)
+  })
+
   t.end()
 })

test/cli.test.js

@@ -100,5 +100,18 @@ test('cli', (t) => {
     t.tearDown(() => child.kill())
   })
 
+  t.test('uses specified timestampKey', (t) => {
+    t.plan(1)
+    const env = { TERM: 'dumb' }
+    const child = spawn(process.argv[0], [bin, '--timestampKey', '@timestamp'], { env })
+    child.on('error', t.threw)
+    child.stdout.on('data', (data) => {
+      t.is(data.toString(), '[1522431328992] INFO : hello world\n')
+    })
+    const logLine = '{"level":30,"@timestamp":1522431328992,"msg":"hello world"}\n'
+    child.stdin.write(logLine)
+    t.tearDown(() => child.kill())
+  })
+
   t.end()
 })