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For Nitro, register the individual hooks directly (",[463,558,559],{},"nitroApp.hooks.hook('evlog:enrich' | 'evlog:drain' | …)",[504,561,562,563,481,565,567,568,570],{},"Prefer single-purpose ",[463,564,480],{},[463,566,486],{}," wrappers for simple extensions; use ",[463,569,490],{}," only when several hooks are needed",[460,572,573,574],{},"Docs: ",[476,575,576],{"href":576,"rel":577},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Fplugins",[578],"nofollow",[580,581,583],"h2",{"id":582},"minimal-example","Minimal example",[585,586,591],"pre",{"className":587,"code":588,"language":589,"meta":590,"style":590},"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","",[463,592,593,625,632,657,678,703,733,783,789,804,830,835],{"__ignoreMap":590},[594,595,598,602,606,610,613,616,619,622],"span",{"class":596,"line":597},"line",1,[594,599,601],{"class":600},"s7zQu","import",[594,603,605],{"class":604},"sMK4o"," {",[594,607,609],{"class":608},"sTEyZ"," definePlugin",[594,611,612],{"class":604}," }",[594,614,615],{"class":600}," from",[594,617,618],{"class":604}," '",[594,620,512],{"class":621},"sfazB",[594,623,624],{"class":604},"'\n",[594,626,628],{"class":596,"line":627},2,[594,629,631],{"emptyLinePlaceholder":630},true,"\n",[594,633,635,638,642,645,648,651,654],{"class":596,"line":634},3,[594,636,637],{"class":600},"export",[594,639,641],{"class":640},"spNyl"," const",[594,643,644],{"class":608}," tenantPlugin ",[594,646,647],{"class":604},"=",[594,649,609],{"class":650},"s2Zo4",[594,652,653],{"class":608},"(",[594,655,656],{"class":604},"{\n",[594,658,660,664,667,669,672,675],{"class":596,"line":659},4,[594,661,663],{"class":662},"swJcz","  name",[594,665,666],{"class":604},":",[594,668,618],{"class":604},[594,670,671],{"class":621},"tenant",[594,673,674],{"class":604},"'",[594,676,677],{"class":604},",\n",[594,679,681,684,687,691,694,697,700],{"class":596,"line":680},5,[594,682,683],{"class":662},"  onRequestStart",[594,685,686],{"class":604},"({",[594,688,690],{"class":689},"sHdIc"," logger",[594,692,693],{"class":604},",",[594,695,696],{"class":689}," headers",[594,698,699],{"class":604}," })",[594,701,702],{"class":604}," {\n",[594,704,706,709,712,715,717,720,723,725,728,730],{"class":596,"line":705},6,[594,707,708],{"class":640},"    const",[594,710,711],{"class":608}," tenantId",[594,713,714],{"class":604}," =",[594,716,696],{"class":608},[594,718,719],{"class":604},"?.",[594,721,722],{"class":662},"[",[594,724,674],{"class":604},[594,726,727],{"class":621},"x-tenant-id",[594,729,674],{"class":604},[594,731,732],{"class":662},"]\n",[594,734,736,739,742,745,748,751,754,757,759,762,765,767,769,772,774,776,778,780],{"class":596,"line":735},7,[594,737,738],{"class":600},"    if",[594,740,741],{"class":662}," (",[594,743,744],{"class":608},"tenantId",[594,746,747],{"class":662},") ",[594,749,750],{"class":608},"logger",[594,752,753],{"class":604},".",[594,755,756],{"class":650},"set",[594,758,653],{"class":662},[594,760,761],{"class":604},"{",[594,763,764],{"class":662}," tenant",[594,766,666],{"class":604},[594,768,605],{"class":604},[594,770,771],{"class":662}," id",[594,773,666],{"class":604},[594,775,711],{"class":608},[594,777,612],{"class":604},[594,779,612],{"class":604},[594,781,782],{"class":662},")\n",[594,784,786],{"class":596,"line":785},8,[594,787,788],{"class":604},"  },\n",[594,790,792,795,797,800,802],{"class":596,"line":791},9,[594,793,794],{"class":662},"  enrich",[594,796,686],{"class":604},[594,798,799],{"class":689}," event",[594,801,699],{"class":604},[594,803,702],{"class":604},[594,805,807,810,812,815,817,820,822,825,827],{"class":596,"line":806},10,[594,808,809],{"class":608},"    event",[594,811,753],{"class":604},[594,813,814],{"class":608},"region",[594,816,714],{"class":604},[594,818,819],{"class":608}," process",[594,821,753],{"class":604},[594,823,824],{"class":608},"env",[594,826,753],{"class":604},[594,828,829],{"class":608},"REGION\n",[594,831,833],{"class":596,"line":832},11,[594,834,788],{"class":604},[594,836,838,841],{"class":596,"line":837},12,[594,839,840],{"class":604},"}",[594,842,782],{"class":608},[460,844,845],{},"Register the plugin where you bootstrap evlog. The shape depends on your runtime:",[847,848,849,919,997],"code-group",{},[585,850,853],{"className":587,"code":851,"filename":852,"language":589,"meta":590,"style":590},"import { initLogger } from 'evlog'\nimport { tenantPlugin } from '.\u002Fplugins\u002Ftenant'\n\ninitLogger({ plugins: [tenantPlugin] })\n","Next.js \u002F standalone",[463,854,855,874,894,898],{"__ignoreMap":590},[594,856,857,859,861,864,866,868,870,872],{"class":596,"line":597},[594,858,601],{"class":600},[594,860,605],{"class":604},[594,862,863],{"class":608}," initLogger",[594,865,612],{"class":604},[594,867,615],{"class":600},[594,869,618],{"class":604},[594,871,512],{"class":621},[594,873,624],{"class":604},[594,875,876,878,880,883,885,887,889,892],{"class":596,"line":627},[594,877,601],{"class":600},[594,879,605],{"class":604},[594,881,882],{"class":608}," tenantPlugin",[594,884,612],{"class":604},[594,886,615],{"class":600},[594,888,618],{"class":604},[594,890,891],{"class":621},".\u002Fplugins\u002Ftenant",[594,893,624],{"class":604},[594,895,896],{"class":596,"line":634},[594,897,631],{"emptyLinePlaceholder":630},[594,899,900,903,905,907,910,912,915,917],{"class":596,"line":659},[594,901,902],{"class":650},"initLogger",[594,904,653],{"class":608},[594,906,761],{"class":604},[594,908,909],{"class":662}," plugins",[594,911,666],{"class":604},[594,913,914],{"class":608}," [tenantPlugin] ",[594,916,840],{"class":604},[594,918,782],{"class":608},[585,920,923],{"className":587,"code":921,"filename":922,"language":589,"meta":590,"style":590},"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",[463,924,925,945,963,967],{"__ignoreMap":590},[594,926,927,929,931,934,936,938,940,943],{"class":596,"line":597},[594,928,601],{"class":600},[594,930,605],{"class":604},[594,932,933],{"class":608}," evlogMiddleware",[594,935,612],{"class":604},[594,937,615],{"class":600},[594,939,618],{"class":604},[594,941,942],{"class":621},"evlog\u002F\u003Cframework>",[594,944,624],{"class":604},[594,946,947,949,951,953,955,957,959,961],{"class":596,"line":627},[594,948,601],{"class":600},[594,950,605],{"class":604},[594,952,882],{"class":608},[594,954,612],{"class":604},[594,956,615],{"class":600},[594,958,618],{"class":604},[594,960,891],{"class":621},[594,962,624],{"class":604},[594,964,965],{"class":596,"line":634},[594,966,631],{"emptyLinePlaceholder":630},[594,968,969,972,974,977,979,982,984,986,988,990,992,994],{"class":596,"line":659},[594,970,971],{"class":608},"app",[594,973,753],{"class":604},[594,975,976],{"class":650},"use",[594,978,653],{"class":608},[594,980,981],{"class":650},"evlogMiddleware",[594,983,653],{"class":608},[594,985,761],{"class":604},[594,987,909],{"class":662},[594,989,666],{"class":604},[594,991,914],{"class":608},[594,993,840],{"class":604},[594,995,996],{"class":608},"))\n",[585,998,1000],{"className":587,"code":999,"filename":182,"language":589,"meta":590,"style":590},"\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",[463,1001,1002,1008,1045],{"__ignoreMap":590},[594,1003,1004],{"class":596,"line":597},[594,1005,1007],{"class":1006},"sHwdD","\u002F\u002F Register the hooks you actually use directly:\n",[594,1009,1010,1013,1015,1018,1020,1023,1025,1027,1030,1032,1034,1036,1038,1040,1043],{"class":596,"line":627},[594,1011,1012],{"class":608},"nitroApp",[594,1014,753],{"class":604},[594,1016,1017],{"class":608},"hooks",[594,1019,753],{"class":604},[594,1021,1022],{"class":650},"hook",[594,1024,653],{"class":608},[594,1026,674],{"class":604},[594,1028,1029],{"class":621},"evlog:enrich",[594,1031,674],{"class":604},[594,1033,693],{"class":604},[594,1035,882],{"class":608},[594,1037,753],{"class":604},[594,1039,520],{"class":608},[594,1041,1042],{"class":604},"!",[594,1044,782],{"class":608},[594,1046,1047,1049,1051,1053,1055,1057,1059,1061,1064,1066,1068,1070,1072,1074,1076],{"class":596,"line":634},[594,1048,1012],{"class":608},[594,1050,753],{"class":604},[594,1052,1017],{"class":608},[594,1054,753],{"class":604},[594,1056,1022],{"class":650},[594,1058,653],{"class":608},[594,1060,674],{"class":604},[594,1062,1063],{"class":621},"evlog:request:start",[594,1065,674],{"class":604},[594,1067,693],{"class":604},[594,1069,882],{"class":608},[594,1071,753],{"class":604},[594,1073,516],{"class":608},[594,1075,1042],{"class":604},[594,1077,782],{"class":608},[580,1079,1080],{"id":1017},"Hooks",[1082,1083,1084,1100],"table",{},[1085,1086,1087],"thead",{},[1088,1089,1090,1094,1097],"tr",{},[1091,1092,1093],"th",{},"Hook",[1091,1095,1096],{},"When",[1091,1098,1099],{},"Use it for",[1101,1102,1103,1120,1135,1148,1168,1181,1194,1207],"tbody",{},[1088,1104,1105,1111,1114],{},[1106,1107,1108],"td",{},[463,1109,1110],{},"setup(ctx)",[1106,1112,1113],{},"Once when registered",[1106,1115,1116,1117,1119],{},"Read ",[463,1118,824],{},", set up shared state",[1088,1121,1122,1127,1130],{},[1106,1123,1124],{},[463,1125,1126],{},"onRequestStart(ctx)",[1106,1128,1129],{},"Each request, before any handler runs",[1106,1131,1132,1133],{},"Pull values from headers into ",[463,1134,750],{},[1088,1136,1137,1142,1145],{},[1106,1138,1139],{},[463,1140,1141],{},"enrich(ctx)",[1106,1143,1144],{},"Every event, before drain",[1106,1146,1147],{},"Add derived fields (geo, deploy id…)",[1088,1149,1150,1155,1158],{},[1106,1151,1152],{},[463,1153,1154],{},"keep(ctx)",[1106,1156,1157],{},"Tail sampling decision",[1106,1159,1160,1161,517,1164,1167],{},"Force-keep based on outcome (",[463,1162,1163],{},"status >= 400",[463,1165,1166],{},"duration > 500",", …)",[1088,1169,1170,1175,1178],{},[1106,1171,1172],{},[463,1173,1174],{},"drain(ctx)",[1106,1176,1177],{},"Every emitted event",[1106,1179,1180],{},"Side-effect: alert, mirror to a queue, etc.",[1088,1182,1183,1188,1191],{},[1106,1184,1185],{},[463,1186,1187],{},"onRequestFinish(ctx)",[1106,1189,1190],{},"After response",[1106,1192,1193],{},"Per-request post-processing",[1088,1195,1196,1201,1204],{},[1106,1197,1198],{},[463,1199,1200],{},"onClientLog(ctx)",[1106,1202,1203],{},"Browser-submitted event hits the ingest endpoint",[1106,1205,1206],{},"Observe \u002F reject client traffic",[1088,1208,1209,1214,1217],{},[1106,1210,1211],{},[463,1212,1213],{},"extendLogger(logger)",[1106,1215,1216],{},"Each request",[1106,1218,1219,1220,536],{},"Add custom methods (e.g. ",[463,1221,1222],{},"logger.audit.refund()",[460,1224,1225,1226,1229,1230,753],{},"Every hook is ",[468,1227,1228],{},"optional",". A plugin can implement any subset. The full type lives in ",[476,1231,1234],{"href":1232,"rel":1233},"https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\u002Fblob\u002Fmain\u002Fpackages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[578],[463,1235,1236],{},"packages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[580,1238,1240],{"id":1239},"a-multi-hook-example","A multi-hook example",[460,1242,1243,1244,1247,1248,517,1251,1253,1254,666],{},"Plugins shine when several concerns share state. Here, a single ",[463,1245,1246],{},"request-metrics"," plugin tracks per-request timing through ",[463,1249,1250],{},"setup",[463,1252,516],{},", and ",[463,1255,523],{},[585,1257,1259],{"className":587,"code":1258,"language":589,"meta":590,"style":590},"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",[463,1260,1261,1280,1284,1301,1315,1319,1333,1363,1367,1371,1383,1437,1441,1446,1460,1519,1524,1529,1547,1590,1595,1600,1619,1665,1671,1677,1682],{"__ignoreMap":590},[594,1262,1263,1265,1267,1269,1271,1273,1275,1278],{"class":596,"line":597},[594,1264,601],{"class":600},[594,1266,605],{"class":604},[594,1268,609],{"class":608},[594,1270,612],{"class":604},[594,1272,615],{"class":600},[594,1274,618],{"class":604},[594,1276,1277],{"class":621},"evlog\u002Ftoolkit",[594,1279,624],{"class":604},[594,1281,1282],{"class":596,"line":627},[594,1283,631],{"emptyLinePlaceholder":630},[594,1285,1286,1288,1290,1293,1295,1297,1299],{"class":596,"line":634},[594,1287,637],{"class":600},[594,1289,641],{"class":640},[594,1291,1292],{"class":608}," requestMetricsPlugin ",[594,1294,647],{"class":604},[594,1296,609],{"class":650},[594,1298,653],{"class":608},[594,1300,656],{"class":604},[594,1302,1303,1305,1307,1309,1311,1313],{"class":596,"line":659},[594,1304,663],{"class":662},[594,1306,666],{"class":604},[594,1308,618],{"class":604},[594,1310,1246],{"class":621},[594,1312,674],{"class":604},[594,1314,677],{"class":604},[594,1316,1317],{"class":596,"line":680},[594,1318,631],{"emptyLinePlaceholder":630},[594,1320,1321,1324,1326,1329,1331],{"class":596,"line":705},[594,1322,1323],{"class":662},"  setup",[594,1325,686],{"class":604},[594,1327,1328],{"class":689}," env",[594,1330,699],{"class":604},[594,1332,702],{"class":604},[594,1334,1335,1338,1340,1343,1345,1347,1350,1352,1354,1356,1359,1361],{"class":596,"line":735},[594,1336,1337],{"class":608},"    statsd",[594,1339,753],{"class":604},[594,1341,1342],{"class":650},"init",[594,1344,653],{"class":662},[594,1346,761],{"class":604},[594,1348,1349],{"class":662}," 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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.",1784142037611]