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For Nitro, register the individual hooks directly (",[522,617,618],{},"nitroApp.hooks.hook('evlog:enrich' | 'evlog:drain' | …)",[563,620,621,622,540,624,626,627,629],{},"Prefer single-purpose ",[522,623,539],{},[522,625,545],{}," wrappers for simple extensions; use ",[522,628,549],{}," only when several hooks are needed",[519,631,632,633],{},"Docs: ",[535,634,635],{"href":635,"rel":636},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Fplugins",[637],"nofollow",[639,640,642],"h2",{"id":641},"minimal-example","Minimal example",[644,645,650],"pre",{"className":646,"code":647,"language":648,"meta":649,"style":649},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { definePlugin } from 'evlog'\n\nexport const tenantPlugin = definePlugin({\n  name: 'tenant',\n  onRequestStart({ logger, headers }) {\n    const tenantId = headers?.['x-tenant-id']\n    if (tenantId) logger.set({ tenant: { id: tenantId } })\n  },\n  enrich({ event }) {\n    event.region = process.env.REGION\n  },\n})\n","ts","",[522,651,652,684,691,716,737,762,792,842,848,863,889,894],{"__ignoreMap":649},[653,654,657,661,665,669,672,675,678,681],"span",{"class":655,"line":656},"line",1,[653,658,660],{"class":659},"s7zQu","import",[653,662,664],{"class":663},"sMK4o"," {",[653,666,668],{"class":667},"sTEyZ"," definePlugin",[653,670,671],{"class":663}," }",[653,673,674],{"class":659}," from",[653,676,677],{"class":663}," '",[653,679,571],{"class":680},"sfazB",[653,682,683],{"class":663},"'\n",[653,685,687],{"class":655,"line":686},2,[653,688,690],{"emptyLinePlaceholder":689},true,"\n",[653,692,694,697,701,704,707,710,713],{"class":655,"line":693},3,[653,695,696],{"class":659},"export",[653,698,700],{"class":699},"spNyl"," const",[653,702,703],{"class":667}," tenantPlugin ",[653,705,706],{"class":663},"=",[653,708,668],{"class":709},"s2Zo4",[653,711,712],{"class":667},"(",[653,714,715],{"class":663},"{\n",[653,717,719,723,726,728,731,734],{"class":655,"line":718},4,[653,720,722],{"class":721},"swJcz","  name",[653,724,725],{"class":663},":",[653,727,677],{"class":663},[653,729,730],{"class":680},"tenant",[653,732,733],{"class":663},"'",[653,735,736],{"class":663},",\n",[653,738,740,743,746,750,753,756,759],{"class":655,"line":739},5,[653,741,742],{"class":721},"  onRequestStart",[653,744,745],{"class":663},"({",[653,747,749],{"class":748},"sHdIc"," logger",[653,751,752],{"class":663},",",[653,754,755],{"class":748}," headers",[653,757,758],{"class":663}," })",[653,760,761],{"class":663}," {\n",[653,763,765,768,771,774,776,779,782,784,787,789],{"class":655,"line":764},6,[653,766,767],{"class":699},"    const",[653,769,770],{"class":667}," tenantId",[653,772,773],{"class":663}," =",[653,775,755],{"class":667},[653,777,778],{"class":663},"?.",[653,780,781],{"class":721},"[",[653,783,733],{"class":663},[653,785,786],{"class":680},"x-tenant-id",[653,788,733],{"class":663},[653,790,791],{"class":721},"]\n",[653,793,795,798,801,804,807,810,813,816,818,821,824,826,828,831,833,835,837,839],{"class":655,"line":794},7,[653,796,797],{"class":659},"    if",[653,799,800],{"class":721}," (",[653,802,803],{"class":667},"tenantId",[653,805,806],{"class":721},") ",[653,808,809],{"class":667},"logger",[653,811,812],{"class":663},".",[653,814,815],{"class":709},"set",[653,817,712],{"class":721},[653,819,820],{"class":663},"{",[653,822,823],{"class":721}," tenant",[653,825,725],{"class":663},[653,827,664],{"class":663},[653,829,830],{"class":721}," id",[653,832,725],{"class":663},[653,834,770],{"class":667},[653,836,671],{"class":663},[653,838,671],{"class":663},[653,840,841],{"class":721},")\n",[653,843,845],{"class":655,"line":844},8,[653,846,847],{"class":663},"  },\n",[653,849,851,854,856,859,861],{"class":655,"line":850},9,[653,852,853],{"class":721},"  enrich",[653,855,745],{"class":663},[653,857,858],{"class":748}," event",[653,860,758],{"class":663},[653,862,761],{"class":663},[653,864,866,869,871,874,876,879,881,884,886],{"class":655,"line":865},10,[653,867,868],{"class":667},"    event",[653,870,812],{"class":663},[653,872,873],{"class":667},"region",[653,875,773],{"class":663},[653,877,878],{"class":667}," process",[653,880,812],{"class":663},[653,882,883],{"class":667},"env",[653,885,812],{"class":663},[653,887,888],{"class":667},"REGION\n",[653,890,892],{"class":655,"line":891},11,[653,893,847],{"class":663},[653,895,897,900],{"class":655,"line":896},12,[653,898,899],{"class":663},"}",[653,901,841],{"class":667},[519,903,904],{},"Register the plugin where you bootstrap evlog. The shape depends on your runtime:",[906,907,908,978,1056],"code-group",{},[644,909,912],{"className":646,"code":910,"filename":911,"language":648,"meta":649,"style":649},"import { initLogger } from 'evlog'\nimport { tenantPlugin } from '.\u002Fplugins\u002Ftenant'\n\ninitLogger({ plugins: [tenantPlugin] })\n","Next.js \u002F standalone",[522,913,914,933,953,957],{"__ignoreMap":649},[653,915,916,918,920,923,925,927,929,931],{"class":655,"line":656},[653,917,660],{"class":659},[653,919,664],{"class":663},[653,921,922],{"class":667}," initLogger",[653,924,671],{"class":663},[653,926,674],{"class":659},[653,928,677],{"class":663},[653,930,571],{"class":680},[653,932,683],{"class":663},[653,934,935,937,939,942,944,946,948,951],{"class":655,"line":686},[653,936,660],{"class":659},[653,938,664],{"class":663},[653,940,941],{"class":667}," tenantPlugin",[653,943,671],{"class":663},[653,945,674],{"class":659},[653,947,677],{"class":663},[653,949,950],{"class":680},".\u002Fplugins\u002Ftenant",[653,952,683],{"class":663},[653,954,955],{"class":655,"line":693},[653,956,690],{"emptyLinePlaceholder":689},[653,958,959,962,964,966,969,971,974,976],{"class":655,"line":718},[653,960,961],{"class":709},"initLogger",[653,963,712],{"class":667},[653,965,820],{"class":663},[653,967,968],{"class":721}," plugins",[653,970,725],{"class":663},[653,972,973],{"class":667}," [tenantPlugin] ",[653,975,899],{"class":663},[653,977,841],{"class":667},[644,979,982],{"className":646,"code":980,"filename":981,"language":648,"meta":649,"style":649},"import { evlogMiddleware } from 'evlog\u002F\u003Cframework>'\nimport { tenantPlugin } from '.\u002Fplugins\u002Ftenant'\n\napp.use(evlogMiddleware({ plugins: [tenantPlugin] }))\n","Hono \u002F Express \u002F Fastify \u002F Elysia",[522,983,984,1004,1022,1026],{"__ignoreMap":649},[653,985,986,988,990,993,995,997,999,1002],{"class":655,"line":656},[653,987,660],{"class":659},[653,989,664],{"class":663},[653,991,992],{"class":667}," evlogMiddleware",[653,994,671],{"class":663},[653,996,674],{"class":659},[653,998,677],{"class":663},[653,1000,1001],{"class":680},"evlog\u002F\u003Cframework>",[653,1003,683],{"class":663},[653,1005,1006,1008,1010,1012,1014,1016,1018,1020],{"class":655,"line":686},[653,1007,660],{"class":659},[653,1009,664],{"class":663},[653,1011,941],{"class":667},[653,1013,671],{"class":663},[653,1015,674],{"class":659},[653,1017,677],{"class":663},[653,1019,950],{"class":680},[653,1021,683],{"class":663},[653,1023,1024],{"class":655,"line":693},[653,1025,690],{"emptyLinePlaceholder":689},[653,1027,1028,1031,1033,1036,1038,1041,1043,1045,1047,1049,1051,1053],{"class":655,"line":718},[653,1029,1030],{"class":667},"app",[653,1032,812],{"class":663},[653,1034,1035],{"class":709},"use",[653,1037,712],{"class":667},[653,1039,1040],{"class":709},"evlogMiddleware",[653,1042,712],{"class":667},[653,1044,820],{"class":663},[653,1046,968],{"class":721},[653,1048,725],{"class":663},[653,1050,973],{"class":667},[653,1052,899],{"class":663},[653,1054,1055],{"class":667},"))\n",[644,1057,1059],{"className":646,"code":1058,"filename":230,"language":648,"meta":649,"style":649},"\u002F\u002F Register the hooks you actually use directly:\nnitroApp.hooks.hook('evlog:enrich', tenantPlugin.enrich!)\nnitroApp.hooks.hook('evlog:request:start', tenantPlugin.onRequestStart!)\n",[522,1060,1061,1067,1104],{"__ignoreMap":649},[653,1062,1063],{"class":655,"line":656},[653,1064,1066],{"class":1065},"sHwdD","\u002F\u002F Register the hooks you actually use directly:\n",[653,1068,1069,1072,1074,1077,1079,1082,1084,1086,1089,1091,1093,1095,1097,1099,1102],{"class":655,"line":686},[653,1070,1071],{"class":667},"nitroApp",[653,1073,812],{"class":663},[653,1075,1076],{"class":667},"hooks",[653,1078,812],{"class":663},[653,1080,1081],{"class":709},"hook",[653,1083,712],{"class":667},[653,1085,733],{"class":663},[653,1087,1088],{"class":680},"evlog:enrich",[653,1090,733],{"class":663},[653,1092,752],{"class":663},[653,1094,941],{"class":667},[653,1096,812],{"class":663},[653,1098,579],{"class":667},[653,1100,1101],{"class":663},"!",[653,1103,841],{"class":667},[653,1105,1106,1108,1110,1112,1114,1116,1118,1120,1123,1125,1127,1129,1131,1133,1135],{"class":655,"line":693},[653,1107,1071],{"class":667},[653,1109,812],{"class":663},[653,1111,1076],{"class":667},[653,1113,812],{"class":663},[653,1115,1081],{"class":709},[653,1117,712],{"class":667},[653,1119,733],{"class":663},[653,1121,1122],{"class":680},"evlog:request:start",[653,1124,733],{"class":663},[653,1126,752],{"class":663},[653,1128,941],{"class":667},[653,1130,812],{"class":663},[653,1132,575],{"class":667},[653,1134,1101],{"class":663},[653,1136,841],{"class":667},[639,1138,1139],{"id":1076},"Hooks",[1141,1142,1143,1159],"table",{},[1144,1145,1146],"thead",{},[1147,1148,1149,1153,1156],"tr",{},[1150,1151,1152],"th",{},"Hook",[1150,1154,1155],{},"When",[1150,1157,1158],{},"Use it for",[1160,1161,1162,1179,1194,1207,1227,1240,1253,1266],"tbody",{},[1147,1163,1164,1170,1173],{},[1165,1166,1167],"td",{},[522,1168,1169],{},"setup(ctx)",[1165,1171,1172],{},"Once when registered",[1165,1174,1175,1176,1178],{},"Read ",[522,1177,883],{},", set up shared state",[1147,1180,1181,1186,1189],{},[1165,1182,1183],{},[522,1184,1185],{},"onRequestStart(ctx)",[1165,1187,1188],{},"Each request, before any handler runs",[1165,1190,1191,1192],{},"Pull values from headers into ",[522,1193,809],{},[1147,1195,1196,1201,1204],{},[1165,1197,1198],{},[522,1199,1200],{},"enrich(ctx)",[1165,1202,1203],{},"Every event, before drain",[1165,1205,1206],{},"Add derived fields (geo, deploy id…)",[1147,1208,1209,1214,1217],{},[1165,1210,1211],{},[522,1212,1213],{},"keep(ctx)",[1165,1215,1216],{},"Tail sampling decision",[1165,1218,1219,1220,576,1223,1226],{},"Force-keep based on outcome (",[522,1221,1222],{},"status >= 400",[522,1224,1225],{},"duration > 500",", …)",[1147,1228,1229,1234,1237],{},[1165,1230,1231],{},[522,1232,1233],{},"drain(ctx)",[1165,1235,1236],{},"Every emitted event",[1165,1238,1239],{},"Side-effect: alert, mirror to a queue, etc.",[1147,1241,1242,1247,1250],{},[1165,1243,1244],{},[522,1245,1246],{},"onRequestFinish(ctx)",[1165,1248,1249],{},"After response",[1165,1251,1252],{},"Per-request post-processing",[1147,1254,1255,1260,1263],{},[1165,1256,1257],{},[522,1258,1259],{},"onClientLog(ctx)",[1165,1261,1262],{},"Browser-submitted event hits the ingest endpoint",[1165,1264,1265],{},"Observe \u002F reject client traffic",[1147,1267,1268,1273,1276],{},[1165,1269,1270],{},[522,1271,1272],{},"extendLogger(logger)",[1165,1274,1275],{},"Each request",[1165,1277,1278,1279,595],{},"Add custom methods (e.g. ",[522,1280,1281],{},"logger.audit.refund()",[519,1283,1284,1285,1288,1289,812],{},"Every hook is ",[527,1286,1287],{},"optional",". A plugin can implement any subset. The full type lives in ",[535,1290,1293],{"href":1291,"rel":1292},"https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\u002Fblob\u002Fmain\u002Fpackages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[637],[522,1294,1295],{},"packages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[639,1297,1299],{"id":1298},"a-multi-hook-example","A multi-hook example",[519,1301,1302,1303,1306,1307,576,1310,1312,1313,725],{},"Plugins shine when several concerns share state. Here, a single ",[522,1304,1305],{},"request-metrics"," plugin tracks per-request timing through ",[522,1308,1309],{},"setup",[522,1311,575],{},", and ",[522,1314,582],{},[644,1316,1318],{"className":646,"code":1317,"language":648,"meta":649,"style":649},"import { definePlugin } from 'evlog\u002Ftoolkit'\n\nexport const requestMetricsPlugin = definePlugin({\n  name: 'request-metrics',\n\n  setup({ env }) {\n    statsd.init({ service: env.service })\n  },\n\n  enrich({ event }) {\n    event.tier = event.duration && event.duration > 1000 ? 'slow' : 'fast'\n  },\n\n  drain({ event }) {\n    statsd.timing('http.request', event.duration as number, { path: event.path as string })\n  },\n\n  onRequestStart({ logger, request }) {\n    logger.set({ trace: { startedAt: Date.now() } })\n  },\n\n  onRequestFinish({ event, durationMs }) {\n    if (event && (event.level === 'error' || durationMs > 5000)) {\n      \u002F\u002F alert \u002F forward \u002F etc.\n    }\n  },\n})\n",[522,1319,1320,1339,1343,1360,1374,1378,1392,1421,1425,1429,1441,1495,1499,1504,1518,1577,1582,1587,1605,1648,1653,1658,1677,1723,1729,1735,1740],{"__ignoreMap":649},[653,1321,1322,1324,1326,1328,1330,1332,1334,1337],{"class":655,"line":656},[653,1323,660],{"class":659},[653,1325,664],{"class":663},[653,1327,668],{"class":667},[653,1329,671],{"class":663},[653,1331,674],{"class":659},[653,1333,677],{"class":663},[653,1335,1336],{"class":680},"evlog\u002Ftoolkit",[653,1338,683],{"class":663},[653,1340,1341],{"class":655,"line":686},[653,1342,690],{"emptyLinePlaceholder":689},[653,1344,1345,1347,1349,1352,1354,1356,1358],{"class":655,"line":693},[653,1346,696],{"class":659},[653,1348,700],{"class":699},[653,1350,1351],{"class":667}," requestMetricsPlugin ",[653,1353,706],{"class":663},[653,1355,668],{"class":709},[653,1357,712],{"class":667},[653,1359,715],{"class":663},[653,1361,1362,1364,1366,1368,1370,1372],{"class":655,"line":718},[653,1363,722],{"class":721},[653,1365,725],{"class":663},[653,1367,677],{"class":663},[653,1369,1305],{"class":680},[653,1371,733],{"class":663},[653,1373,736],{"class":663},[653,1375,1376],{"class":655,"line":739},[653,1377,690],{"emptyLinePlaceholder":689},[653,1379,1380,1383,1385,1388,1390],{"class":655,"line":764},[653,1381,1382],{"class":721},"  setup",[653,1384,745],{"class":663},[653,1386,1387],{"class":748}," env",[653,1389,758],{"class":663},[653,1391,761],{"class":663},[653,1393,1394,1397,1399,1401,1403,1405,1408,1410,1412,1414,1417,1419],{"class":655,"line":794},[653,1395,1396],{"class":667},"    statsd",[653,1398,812],{"class":663},[653,1400,89],{"class":709},[653,1402,712],{"class":721},[653,1404,820],{"class":663},[653,1406,1407],{"class":721}," 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Add deployment metadata, tenant IDs, feature flags, geo, or any computed data — the toolkit handles error isolation, undefined skipping, and the merge step.",1785599597473]