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For Nitro, register the individual hooks directly (",[517,612,613],{},"nitroApp.hooks.hook('evlog:enrich' | 'evlog:drain' | …)",[558,615,616,617,535,619,621,622,624],{},"Prefer single-purpose ",[517,618,534],{},[517,620,540],{}," wrappers for simple extensions; use ",[517,623,544],{}," only when several hooks are needed",[514,626,627,628],{},"Docs: ",[530,629,630],{"href":630,"rel":631},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Fplugins",[632],"nofollow",[634,635,637],"h2",{"id":636},"minimal-example","Minimal example",[639,640,645],"pre",{"className":641,"code":642,"language":643,"meta":644,"style":644},"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","",[517,646,647,679,686,711,732,757,787,837,843,858,884,889],{"__ignoreMap":644},[648,649,652,656,660,664,667,670,673,676],"span",{"class":650,"line":651},"line",1,[648,653,655],{"class":654},"s7zQu","import",[648,657,659],{"class":658},"sMK4o"," {",[648,661,663],{"class":662},"sTEyZ"," definePlugin",[648,665,666],{"class":658}," }",[648,668,669],{"class":654}," from",[648,671,672],{"class":658}," '",[648,674,566],{"class":675},"sfazB",[648,677,678],{"class":658},"'\n",[648,680,682],{"class":650,"line":681},2,[648,683,685],{"emptyLinePlaceholder":684},true,"\n",[648,687,689,692,696,699,702,705,708],{"class":650,"line":688},3,[648,690,691],{"class":654},"export",[648,693,695],{"class":694},"spNyl"," const",[648,697,698],{"class":662}," tenantPlugin ",[648,700,701],{"class":658},"=",[648,703,663],{"class":704},"s2Zo4",[648,706,707],{"class":662},"(",[648,709,710],{"class":658},"{\n",[648,712,714,718,721,723,726,729],{"class":650,"line":713},4,[648,715,717],{"class":716},"swJcz","  name",[648,719,720],{"class":658},":",[648,722,672],{"class":658},[648,724,725],{"class":675},"tenant",[648,727,728],{"class":658},"'",[648,730,731],{"class":658},",\n",[648,733,735,738,741,745,748,751,754],{"class":650,"line":734},5,[648,736,737],{"class":716},"  onRequestStart",[648,739,740],{"class":658},"({",[648,742,744],{"class":743},"sHdIc"," logger",[648,746,747],{"class":658},",",[648,749,750],{"class":743}," headers",[648,752,753],{"class":658}," })",[648,755,756],{"class":658}," {\n",[648,758,760,763,766,769,771,774,777,779,782,784],{"class":650,"line":759},6,[648,761,762],{"class":694},"    const",[648,764,765],{"class":662}," tenantId",[648,767,768],{"class":658}," =",[648,770,750],{"class":662},[648,772,773],{"class":658},"?.",[648,775,776],{"class":716},"[",[648,778,728],{"class":658},[648,780,781],{"class":675},"x-tenant-id",[648,783,728],{"class":658},[648,785,786],{"class":716},"]\n",[648,788,790,793,796,799,802,805,808,811,813,816,819,821,823,826,828,830,832,834],{"class":650,"line":789},7,[648,791,792],{"class":654},"    if",[648,794,795],{"class":716}," (",[648,797,798],{"class":662},"tenantId",[648,800,801],{"class":716},") ",[648,803,804],{"class":662},"logger",[648,806,807],{"class":658},".",[648,809,810],{"class":704},"set",[648,812,707],{"class":716},[648,814,815],{"class":658},"{",[648,817,818],{"class":716}," tenant",[648,820,720],{"class":658},[648,822,659],{"class":658},[648,824,825],{"class":716}," id",[648,827,720],{"class":658},[648,829,765],{"class":662},[648,831,666],{"class":658},[648,833,666],{"class":658},[648,835,836],{"class":716},")\n",[648,838,840],{"class":650,"line":839},8,[648,841,842],{"class":658},"  },\n",[648,844,846,849,851,854,856],{"class":650,"line":845},9,[648,847,848],{"class":716},"  enrich",[648,850,740],{"class":658},[648,852,853],{"class":743}," event",[648,855,753],{"class":658},[648,857,756],{"class":658},[648,859,861,864,866,869,871,874,876,879,881],{"class":650,"line":860},10,[648,862,863],{"class":662},"    event",[648,865,807],{"class":658},[648,867,868],{"class":662},"region",[648,870,768],{"class":658},[648,872,873],{"class":662}," process",[648,875,807],{"class":658},[648,877,878],{"class":662},"env",[648,880,807],{"class":658},[648,882,883],{"class":662},"REGION\n",[648,885,887],{"class":650,"line":886},11,[648,888,842],{"class":658},[648,890,892,895],{"class":650,"line":891},12,[648,893,894],{"class":658},"}",[648,896,836],{"class":662},[514,898,899],{},"Register the plugin where you bootstrap evlog. The shape depends on your runtime:",[901,902,903,973,1051],"code-group",{},[639,904,907],{"className":641,"code":905,"filename":906,"language":643,"meta":644,"style":644},"import { initLogger } from 'evlog'\nimport { tenantPlugin } from '.\u002Fplugins\u002Ftenant'\n\ninitLogger({ plugins: [tenantPlugin] })\n","Next.js \u002F standalone",[517,908,909,928,948,952],{"__ignoreMap":644},[648,910,911,913,915,918,920,922,924,926],{"class":650,"line":651},[648,912,655],{"class":654},[648,914,659],{"class":658},[648,916,917],{"class":662}," initLogger",[648,919,666],{"class":658},[648,921,669],{"class":654},[648,923,672],{"class":658},[648,925,566],{"class":675},[648,927,678],{"class":658},[648,929,930,932,934,937,939,941,943,946],{"class":650,"line":681},[648,931,655],{"class":654},[648,933,659],{"class":658},[648,935,936],{"class":662}," tenantPlugin",[648,938,666],{"class":658},[648,940,669],{"class":654},[648,942,672],{"class":658},[648,944,945],{"class":675},".\u002Fplugins\u002Ftenant",[648,947,678],{"class":658},[648,949,950],{"class":650,"line":688},[648,951,685],{"emptyLinePlaceholder":684},[648,953,954,957,959,961,964,966,969,971],{"class":650,"line":713},[648,955,956],{"class":704},"initLogger",[648,958,707],{"class":662},[648,960,815],{"class":658},[648,962,963],{"class":716}," plugins",[648,965,720],{"class":658},[648,967,968],{"class":662}," [tenantPlugin] ",[648,970,894],{"class":658},[648,972,836],{"class":662},[639,974,977],{"className":641,"code":975,"filename":976,"language":643,"meta":644,"style":644},"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",[517,978,979,999,1017,1021],{"__ignoreMap":644},[648,980,981,983,985,988,990,992,994,997],{"class":650,"line":651},[648,982,655],{"class":654},[648,984,659],{"class":658},[648,986,987],{"class":662}," evlogMiddleware",[648,989,666],{"class":658},[648,991,669],{"class":654},[648,993,672],{"class":658},[648,995,996],{"class":675},"evlog\u002F\u003Cframework>",[648,998,678],{"class":658},[648,1000,1001,1003,1005,1007,1009,1011,1013,1015],{"class":650,"line":681},[648,1002,655],{"class":654},[648,1004,659],{"class":658},[648,1006,936],{"class":662},[648,1008,666],{"class":658},[648,1010,669],{"class":654},[648,1012,672],{"class":658},[648,1014,945],{"class":675},[648,1016,678],{"class":658},[648,1018,1019],{"class":650,"line":688},[648,1020,685],{"emptyLinePlaceholder":684},[648,1022,1023,1026,1028,1031,1033,1036,1038,1040,1042,1044,1046,1048],{"class":650,"line":713},[648,1024,1025],{"class":662},"app",[648,1027,807],{"class":658},[648,1029,1030],{"class":704},"use",[648,1032,707],{"class":662},[648,1034,1035],{"class":704},"evlogMiddleware",[648,1037,707],{"class":662},[648,1039,815],{"class":658},[648,1041,963],{"class":716},[648,1043,720],{"class":658},[648,1045,968],{"class":662},[648,1047,894],{"class":658},[648,1049,1050],{"class":662},"))\n",[639,1052,1054],{"className":641,"code":1053,"filename":225,"language":643,"meta":644,"style":644},"\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",[517,1055,1056,1062,1099],{"__ignoreMap":644},[648,1057,1058],{"class":650,"line":651},[648,1059,1061],{"class":1060},"sHwdD","\u002F\u002F Register the hooks you actually use directly:\n",[648,1063,1064,1067,1069,1072,1074,1077,1079,1081,1084,1086,1088,1090,1092,1094,1097],{"class":650,"line":681},[648,1065,1066],{"class":662},"nitroApp",[648,1068,807],{"class":658},[648,1070,1071],{"class":662},"hooks",[648,1073,807],{"class":658},[648,1075,1076],{"class":704},"hook",[648,1078,707],{"class":662},[648,1080,728],{"class":658},[648,1082,1083],{"class":675},"evlog:enrich",[648,1085,728],{"class":658},[648,1087,747],{"class":658},[648,1089,936],{"class":662},[648,1091,807],{"class":658},[648,1093,574],{"class":662},[648,1095,1096],{"class":658},"!",[648,1098,836],{"class":662},[648,1100,1101,1103,1105,1107,1109,1111,1113,1115,1118,1120,1122,1124,1126,1128,1130],{"class":650,"line":688},[648,1102,1066],{"class":662},[648,1104,807],{"class":658},[648,1106,1071],{"class":662},[648,1108,807],{"class":658},[648,1110,1076],{"class":704},[648,1112,707],{"class":662},[648,1114,728],{"class":658},[648,1116,1117],{"class":675},"evlog:request:start",[648,1119,728],{"class":658},[648,1121,747],{"class":658},[648,1123,936],{"class":662},[648,1125,807],{"class":658},[648,1127,570],{"class":662},[648,1129,1096],{"class":658},[648,1131,836],{"class":662},[634,1133,1134],{"id":1071},"Hooks",[1136,1137,1138,1154],"table",{},[1139,1140,1141],"thead",{},[1142,1143,1144,1148,1151],"tr",{},[1145,1146,1147],"th",{},"Hook",[1145,1149,1150],{},"When",[1145,1152,1153],{},"Use it for",[1155,1156,1157,1174,1189,1202,1222,1235,1248,1261],"tbody",{},[1142,1158,1159,1165,1168],{},[1160,1161,1162],"td",{},[517,1163,1164],{},"setup(ctx)",[1160,1166,1167],{},"Once when registered",[1160,1169,1170,1171,1173],{},"Read ",[517,1172,878],{},", set up shared state",[1142,1175,1176,1181,1184],{},[1160,1177,1178],{},[517,1179,1180],{},"onRequestStart(ctx)",[1160,1182,1183],{},"Each request, before any handler runs",[1160,1185,1186,1187],{},"Pull values from headers into ",[517,1188,804],{},[1142,1190,1191,1196,1199],{},[1160,1192,1193],{},[517,1194,1195],{},"enrich(ctx)",[1160,1197,1198],{},"Every event, before drain",[1160,1200,1201],{},"Add derived fields (geo, deploy id…)",[1142,1203,1204,1209,1212],{},[1160,1205,1206],{},[517,1207,1208],{},"keep(ctx)",[1160,1210,1211],{},"Tail sampling decision",[1160,1213,1214,1215,571,1218,1221],{},"Force-keep based on outcome (",[517,1216,1217],{},"status >= 400",[517,1219,1220],{},"duration > 500",", …)",[1142,1223,1224,1229,1232],{},[1160,1225,1226],{},[517,1227,1228],{},"drain(ctx)",[1160,1230,1231],{},"Every emitted event",[1160,1233,1234],{},"Side-effect: alert, mirror to a queue, etc.",[1142,1236,1237,1242,1245],{},[1160,1238,1239],{},[517,1240,1241],{},"onRequestFinish(ctx)",[1160,1243,1244],{},"After response",[1160,1246,1247],{},"Per-request post-processing",[1142,1249,1250,1255,1258],{},[1160,1251,1252],{},[517,1253,1254],{},"onClientLog(ctx)",[1160,1256,1257],{},"Browser-submitted event hits the ingest endpoint",[1160,1259,1260],{},"Observe \u002F reject client traffic",[1142,1262,1263,1268,1271],{},[1160,1264,1265],{},[517,1266,1267],{},"extendLogger(logger)",[1160,1269,1270],{},"Each request",[1160,1272,1273,1274,590],{},"Add custom methods (e.g. ",[517,1275,1276],{},"logger.audit.refund()",[514,1278,1279,1280,1283,1284,807],{},"Every hook is ",[522,1281,1282],{},"optional",". A plugin can implement any subset. The full type lives in ",[530,1285,1288],{"href":1286,"rel":1287},"https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\u002Fblob\u002Fmain\u002Fpackages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[632],[517,1289,1290],{},"packages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[634,1292,1294],{"id":1293},"a-multi-hook-example","A multi-hook example",[514,1296,1297,1298,1301,1302,571,1305,1307,1308,720],{},"Plugins shine when several concerns share state. Here, a single ",[517,1299,1300],{},"request-metrics"," plugin tracks per-request timing through ",[517,1303,1304],{},"setup",[517,1306,570],{},", and ",[517,1309,577],{},[639,1311,1313],{"className":641,"code":1312,"language":643,"meta":644,"style":644},"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",[517,1314,1315,1334,1338,1355,1369,1373,1387,1416,1420,1424,1436,1490,1494,1499,1513,1572,1577,1582,1600,1643,1648,1653,1672,1718,1724,1730,1735],{"__ignoreMap":644},[648,1316,1317,1319,1321,1323,1325,1327,1329,1332],{"class":650,"line":651},[648,1318,655],{"class":654},[648,1320,659],{"class":658},[648,1322,663],{"class":662},[648,1324,666],{"class":658},[648,1326,669],{"class":654},[648,1328,672],{"class":658},[648,1330,1331],{"class":675},"evlog\u002Ftoolkit",[648,1333,678],{"class":658},[648,1335,1336],{"class":650,"line":681},[648,1337,685],{"emptyLinePlaceholder":684},[648,1339,1340,1342,1344,1347,1349,1351,1353],{"class":650,"line":688},[648,1341,691],{"class":654},[648,1343,695],{"class":694},[648,1345,1346],{"class":662}," requestMetricsPlugin ",[648,1348,701],{"class":658},[648,1350,663],{"class":704},[648,1352,707],{"class":662},[648,1354,710],{"class":658},[648,1356,1357,1359,1361,1363,1365,1367],{"class":650,"line":713},[648,1358,717],{"class":716},[648,1360,720],{"class":658},[648,1362,672],{"class":658},[648,1364,1300],{"class":675},[648,1366,728],{"class":658},[648,1368,731],{"class":658},[648,1370,1371],{"class":650,"line":734},[648,1372,685],{"emptyLinePlaceholder":684},[648,1374,1375,1378,1380,1383,1385],{"class":650,"line":759},[648,1376,1377],{"class":716},"  setup",[648,1379,740],{"class":658},[648,1381,1382],{"class":743}," env",[648,1384,753],{"class":658},[648,1386,756],{"class":658},[648,1388,1389,1392,1394,1396,1398,1400,1403,1405,1407,1409,1412,1414],{"class":650,"line":789},[648,1390,1391],{"class":662},"    statsd",[648,1393,807],{"class":658},[648,1395,89],{"class":704},[648,1397,707],{"class":716},[648,1399,815],{"class":658},[648,1401,1402],{"class":716}," 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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.",1785229772485]