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For Nitro, register the individual hooks directly (",[537,632,633],{},"nitroApp.hooks.hook('evlog:enrich' | 'evlog:drain' | …)",[578,635,636,637,555,639,641,642,644],{},"Prefer single-purpose ",[537,638,554],{},[537,640,560],{}," wrappers for simple extensions; use ",[537,643,564],{}," only when several hooks are needed",[534,646,647,648],{},"Docs: ",[550,649,650],{"href":650,"rel":651},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Fplugins",[652],"nofollow",[654,655,657],"h2",{"id":656},"minimal-example","Minimal example",[659,660,665],"pre",{"className":661,"code":662,"language":663,"meta":664,"style":664},"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","",[537,666,667,699,706,731,752,777,807,857,863,878,904,909],{"__ignoreMap":664},[668,669,672,676,680,684,687,690,693,696],"span",{"class":670,"line":671},"line",1,[668,673,675],{"class":674},"s7zQu","import",[668,677,679],{"class":678},"sMK4o"," {",[668,681,683],{"class":682},"sTEyZ"," definePlugin",[668,685,686],{"class":678}," }",[668,688,689],{"class":674}," from",[668,691,692],{"class":678}," '",[668,694,586],{"class":695},"sfazB",[668,697,698],{"class":678},"'\n",[668,700,702],{"class":670,"line":701},2,[668,703,705],{"emptyLinePlaceholder":704},true,"\n",[668,707,709,712,716,719,722,725,728],{"class":670,"line":708},3,[668,710,711],{"class":674},"export",[668,713,715],{"class":714},"spNyl"," const",[668,717,718],{"class":682}," tenantPlugin ",[668,720,721],{"class":678},"=",[668,723,683],{"class":724},"s2Zo4",[668,726,727],{"class":682},"(",[668,729,730],{"class":678},"{\n",[668,732,734,738,741,743,746,749],{"class":670,"line":733},4,[668,735,737],{"class":736},"swJcz","  name",[668,739,740],{"class":678},":",[668,742,692],{"class":678},[668,744,745],{"class":695},"tenant",[668,747,748],{"class":678},"'",[668,750,751],{"class":678},",\n",[668,753,755,758,761,765,768,771,774],{"class":670,"line":754},5,[668,756,757],{"class":736},"  onRequestStart",[668,759,760],{"class":678},"({",[668,762,764],{"class":763},"sHdIc"," logger",[668,766,767],{"class":678},",",[668,769,770],{"class":763}," headers",[668,772,773],{"class":678}," })",[668,775,776],{"class":678}," {\n",[668,778,780,783,786,789,791,794,797,799,802,804],{"class":670,"line":779},6,[668,781,782],{"class":714},"    const",[668,784,785],{"class":682}," tenantId",[668,787,788],{"class":678}," =",[668,790,770],{"class":682},[668,792,793],{"class":678},"?.",[668,795,796],{"class":736},"[",[668,798,748],{"class":678},[668,800,801],{"class":695},"x-tenant-id",[668,803,748],{"class":678},[668,805,806],{"class":736},"]\n",[668,808,810,813,816,819,822,825,828,831,833,836,839,841,843,846,848,850,852,854],{"class":670,"line":809},7,[668,811,812],{"class":674},"    if",[668,814,815],{"class":736}," (",[668,817,818],{"class":682},"tenantId",[668,820,821],{"class":736},") ",[668,823,824],{"class":682},"logger",[668,826,827],{"class":678},".",[668,829,830],{"class":724},"set",[668,832,727],{"class":736},[668,834,835],{"class":678},"{",[668,837,838],{"class":736}," tenant",[668,840,740],{"class":678},[668,842,679],{"class":678},[668,844,845],{"class":736}," id",[668,847,740],{"class":678},[668,849,785],{"class":682},[668,851,686],{"class":678},[668,853,686],{"class":678},[668,855,856],{"class":736},")\n",[668,858,860],{"class":670,"line":859},8,[668,861,862],{"class":678},"  },\n",[668,864,866,869,871,874,876],{"class":670,"line":865},9,[668,867,868],{"class":736},"  enrich",[668,870,760],{"class":678},[668,872,873],{"class":763}," event",[668,875,773],{"class":678},[668,877,776],{"class":678},[668,879,881,884,886,889,891,894,896,899,901],{"class":670,"line":880},10,[668,882,883],{"class":682},"    event",[668,885,827],{"class":678},[668,887,888],{"class":682},"region",[668,890,788],{"class":678},[668,892,893],{"class":682}," process",[668,895,827],{"class":678},[668,897,898],{"class":682},"env",[668,900,827],{"class":678},[668,902,903],{"class":682},"REGION\n",[668,905,907],{"class":670,"line":906},11,[668,908,862],{"class":678},[668,910,912,915],{"class":670,"line":911},12,[668,913,914],{"class":678},"}",[668,916,856],{"class":682},[534,918,919],{},"Register the plugin where you bootstrap evlog. The shape depends on your runtime:",[921,922,923,993,1071],"code-group",{},[659,924,927],{"className":661,"code":925,"filename":926,"language":663,"meta":664,"style":664},"import { initLogger } from 'evlog'\nimport { tenantPlugin } from '.\u002Fplugins\u002Ftenant'\n\ninitLogger({ plugins: [tenantPlugin] })\n","Next.js \u002F standalone",[537,928,929,948,968,972],{"__ignoreMap":664},[668,930,931,933,935,938,940,942,944,946],{"class":670,"line":671},[668,932,675],{"class":674},[668,934,679],{"class":678},[668,936,937],{"class":682}," initLogger",[668,939,686],{"class":678},[668,941,689],{"class":674},[668,943,692],{"class":678},[668,945,586],{"class":695},[668,947,698],{"class":678},[668,949,950,952,954,957,959,961,963,966],{"class":670,"line":701},[668,951,675],{"class":674},[668,953,679],{"class":678},[668,955,956],{"class":682}," tenantPlugin",[668,958,686],{"class":678},[668,960,689],{"class":674},[668,962,692],{"class":678},[668,964,965],{"class":695},".\u002Fplugins\u002Ftenant",[668,967,698],{"class":678},[668,969,970],{"class":670,"line":708},[668,971,705],{"emptyLinePlaceholder":704},[668,973,974,977,979,981,984,986,989,991],{"class":670,"line":733},[668,975,976],{"class":724},"initLogger",[668,978,727],{"class":682},[668,980,835],{"class":678},[668,982,983],{"class":736}," plugins",[668,985,740],{"class":678},[668,987,988],{"class":682}," [tenantPlugin] ",[668,990,914],{"class":678},[668,992,856],{"class":682},[659,994,997],{"className":661,"code":995,"filename":996,"language":663,"meta":664,"style":664},"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",[537,998,999,1019,1037,1041],{"__ignoreMap":664},[668,1000,1001,1003,1005,1008,1010,1012,1014,1017],{"class":670,"line":671},[668,1002,675],{"class":674},[668,1004,679],{"class":678},[668,1006,1007],{"class":682}," evlogMiddleware",[668,1009,686],{"class":678},[668,1011,689],{"class":674},[668,1013,692],{"class":678},[668,1015,1016],{"class":695},"evlog\u002F\u003Cframework>",[668,1018,698],{"class":678},[668,1020,1021,1023,1025,1027,1029,1031,1033,1035],{"class":670,"line":701},[668,1022,675],{"class":674},[668,1024,679],{"class":678},[668,1026,956],{"class":682},[668,1028,686],{"class":678},[668,1030,689],{"class":674},[668,1032,692],{"class":678},[668,1034,965],{"class":695},[668,1036,698],{"class":678},[668,1038,1039],{"class":670,"line":708},[668,1040,705],{"emptyLinePlaceholder":704},[668,1042,1043,1046,1048,1051,1053,1056,1058,1060,1062,1064,1066,1068],{"class":670,"line":733},[668,1044,1045],{"class":682},"app",[668,1047,827],{"class":678},[668,1049,1050],{"class":724},"use",[668,1052,727],{"class":682},[668,1054,1055],{"class":724},"evlogMiddleware",[668,1057,727],{"class":682},[668,1059,835],{"class":678},[668,1061,983],{"class":736},[668,1063,740],{"class":678},[668,1065,988],{"class":682},[668,1067,914],{"class":678},[668,1069,1070],{"class":682},"))\n",[659,1072,1074],{"className":661,"code":1073,"filename":245,"language":663,"meta":664,"style":664},"\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",[537,1075,1076,1082,1119],{"__ignoreMap":664},[668,1077,1078],{"class":670,"line":671},[668,1079,1081],{"class":1080},"sHwdD","\u002F\u002F Register the hooks you actually use directly:\n",[668,1083,1084,1087,1089,1092,1094,1097,1099,1101,1104,1106,1108,1110,1112,1114,1117],{"class":670,"line":701},[668,1085,1086],{"class":682},"nitroApp",[668,1088,827],{"class":678},[668,1090,1091],{"class":682},"hooks",[668,1093,827],{"class":678},[668,1095,1096],{"class":724},"hook",[668,1098,727],{"class":682},[668,1100,748],{"class":678},[668,1102,1103],{"class":695},"evlog:enrich",[668,1105,748],{"class":678},[668,1107,767],{"class":678},[668,1109,956],{"class":682},[668,1111,827],{"class":678},[668,1113,594],{"class":682},[668,1115,1116],{"class":678},"!",[668,1118,856],{"class":682},[668,1120,1121,1123,1125,1127,1129,1131,1133,1135,1138,1140,1142,1144,1146,1148,1150],{"class":670,"line":708},[668,1122,1086],{"class":682},[668,1124,827],{"class":678},[668,1126,1091],{"class":682},[668,1128,827],{"class":678},[668,1130,1096],{"class":724},[668,1132,727],{"class":682},[668,1134,748],{"class":678},[668,1136,1137],{"class":695},"evlog:request:start",[668,1139,748],{"class":678},[668,1141,767],{"class":678},[668,1143,956],{"class":682},[668,1145,827],{"class":678},[668,1147,590],{"class":682},[668,1149,1116],{"class":678},[668,1151,856],{"class":682},[654,1153,1154],{"id":1091},"Hooks",[1156,1157,1158,1174],"table",{},[1159,1160,1161],"thead",{},[1162,1163,1164,1168,1171],"tr",{},[1165,1166,1167],"th",{},"Hook",[1165,1169,1170],{},"When",[1165,1172,1173],{},"Use it for",[1175,1176,1177,1194,1209,1222,1242,1255,1268,1281],"tbody",{},[1162,1178,1179,1185,1188],{},[1180,1181,1182],"td",{},[537,1183,1184],{},"setup(ctx)",[1180,1186,1187],{},"Once when registered",[1180,1189,1190,1191,1193],{},"Read ",[537,1192,898],{},", set up shared state",[1162,1195,1196,1201,1204],{},[1180,1197,1198],{},[537,1199,1200],{},"onRequestStart(ctx)",[1180,1202,1203],{},"Each request, before any handler runs",[1180,1205,1206,1207],{},"Pull values from headers into ",[537,1208,824],{},[1162,1210,1211,1216,1219],{},[1180,1212,1213],{},[537,1214,1215],{},"enrich(ctx)",[1180,1217,1218],{},"Every event, before drain",[1180,1220,1221],{},"Add derived fields (geo, deploy id…)",[1162,1223,1224,1229,1232],{},[1180,1225,1226],{},[537,1227,1228],{},"keep(ctx)",[1180,1230,1231],{},"Tail sampling decision",[1180,1233,1234,1235,591,1238,1241],{},"Force-keep based on outcome (",[537,1236,1237],{},"status >= 400",[537,1239,1240],{},"duration > 500",", …)",[1162,1243,1244,1249,1252],{},[1180,1245,1246],{},[537,1247,1248],{},"drain(ctx)",[1180,1250,1251],{},"Every emitted event",[1180,1253,1254],{},"Side-effect: alert, mirror to a queue, etc.",[1162,1256,1257,1262,1265],{},[1180,1258,1259],{},[537,1260,1261],{},"onRequestFinish(ctx)",[1180,1263,1264],{},"After response",[1180,1266,1267],{},"Per-request post-processing",[1162,1269,1270,1275,1278],{},[1180,1271,1272],{},[537,1273,1274],{},"onClientLog(ctx)",[1180,1276,1277],{},"Browser-submitted event hits the ingest endpoint",[1180,1279,1280],{},"Observe \u002F reject client traffic",[1162,1282,1283,1288,1291],{},[1180,1284,1285],{},[537,1286,1287],{},"extendLogger(logger)",[1180,1289,1290],{},"Each request",[1180,1292,1293,1294,610],{},"Add custom methods (e.g. ",[537,1295,1296],{},"logger.audit.refund()",[534,1298,1299,1300,1303,1304,827],{},"Every hook is ",[542,1301,1302],{},"optional",". A plugin can implement any subset. The full type lives in ",[550,1305,1308],{"href":1306,"rel":1307},"https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\u002Fblob\u002Fmain\u002Fpackages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[652],[537,1309,1310],{},"packages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[654,1312,1314],{"id":1313},"a-multi-hook-example","A multi-hook example",[534,1316,1317,1318,1321,1322,591,1325,1327,1328,740],{},"Plugins shine when several concerns share state. Here, a single ",[537,1319,1320],{},"request-metrics"," plugin tracks per-request timing through ",[537,1323,1324],{},"setup",[537,1326,590],{},", and ",[537,1329,597],{},[659,1331,1333],{"className":661,"code":1332,"language":663,"meta":664,"style":664},"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",[537,1334,1335,1354,1358,1375,1389,1393,1407,1436,1440,1444,1456,1510,1514,1519,1533,1592,1597,1602,1620,1663,1668,1673,1692,1738,1744,1750,1755],{"__ignoreMap":664},[668,1336,1337,1339,1341,1343,1345,1347,1349,1352],{"class":670,"line":671},[668,1338,675],{"class":674},[668,1340,679],{"class":678},[668,1342,683],{"class":682},[668,1344,686],{"class":678},[668,1346,689],{"class":674},[668,1348,692],{"class":678},[668,1350,1351],{"class":695},"evlog\u002Ftoolkit",[668,1353,698],{"class":678},[668,1355,1356],{"class":670,"line":701},[668,1357,705],{"emptyLinePlaceholder":704},[668,1359,1360,1362,1364,1367,1369,1371,1373],{"class":670,"line":708},[668,1361,711],{"class":674},[668,1363,715],{"class":714},[668,1365,1366],{"class":682}," requestMetricsPlugin ",[668,1368,721],{"class":678},[668,1370,683],{"class":724},[668,1372,727],{"class":682},[668,1374,730],{"class":678},[668,1376,1377,1379,1381,1383,1385,1387],{"class":670,"line":733},[668,1378,737],{"class":736},[668,1380,740],{"class":678},[668,1382,692],{"class":678},[668,1384,1320],{"class":695},[668,1386,748],{"class":678},[668,1388,751],{"class":678},[668,1390,1391],{"class":670,"line":754},[668,1392,705],{"emptyLinePlaceholder":704},[668,1394,1395,1398,1400,1403,1405],{"class":670,"line":779},[668,1396,1397],{"class":736},"  setup",[668,1399,760],{"class":678},[668,1401,1402],{"class":763}," env",[668,1404,773],{"class":678},[668,1406,776],{"class":678},[668,1408,1409,1412,1414,1416,1418,1420,1423,1425,1427,1429,1432,1434],{"class":670,"line":809},[668,1410,1411],{"class":682},"    statsd",[668,1413,827],{"class":678},[668,1415,89],{"class":724},[668,1417,727],{"class":736},[668,1419,835],{"class":678},[668,1421,1422],{"class":736}," 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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.",1785675164839]