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Reach for ",[593,619,620],{},"definePlugin"," when several hooks share state.",[623,624,627,630,701],"prompt",{":actions":625,"description":626,"icon":466},"[\"copy\",\"cursor\",\"claude\"]","Build a multi-hook evlog plugin",[590,628,629],{},"Build an evlog plugin that hooks into more than one lifecycle stage.",[631,632,633,667,673,676,690],"ul",{},[634,635,636,637,639,640,643,644,647,648,647,651,647,654,647,657,647,660,647,663,666],"li",{},"Import ",[593,638,620],{}," from ",[593,641,642],{},"evlog"," and pick the hooks I need (",[593,645,646],{},"onRequestStart",", ",[593,649,650],{},"enrich",[593,652,653],{},"drain",[593,655,656],{},"extendLogger",[593,658,659],{},"keep",[593,661,662],{},"onClientLog",[593,664,665],{},"onRequestFinish",")",[634,668,669,670,672],{},"Keep ",[593,671,650],{}," pure (no I\u002FO, no throwing, use try\u002Fcatch internally)",[634,674,675],{},"For drains, batch and ship to the destination; respect backpressure if the drain is slow",[634,677,678,679,682,683,686,687,666],{},"Register the plugin via the framework config: Next\u002Fstandalone ",[593,680,681],{},"initLogger({ plugins: [myPlugin] })",", Hono\u002FExpress\u002FFastify\u002FElysia middleware option ",[593,684,685],{},"{ plugins: [myPlugin] }",". For Nitro, register the individual hooks directly (",[593,688,689],{},"nitroApp.hooks.hook('evlog:enrich' | 'evlog:drain' | …)",[634,691,692,693,611,695,697,698,700],{},"Prefer single-purpose ",[593,694,610],{},[593,696,616],{}," wrappers for simple extensions; use ",[593,699,620],{}," only when several hooks are needed",[590,702,703,704],{},"Docs: ",[606,705,706],{"href":706,"rel":707},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Fplugins",[708],"nofollow",[710,711,713],"h2",{"id":712},"minimal-example","Minimal example",[715,716,721],"pre",{"className":717,"code":718,"language":719,"meta":720,"style":720},"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","",[593,722,723,755,762,787,808,833,863,913,919,934,960,965],{"__ignoreMap":720},[724,725,728,732,736,740,743,746,749,752],"span",{"class":726,"line":727},"line",1,[724,729,731],{"class":730},"s7zQu","import",[724,733,735],{"class":734},"sMK4o"," {",[724,737,739],{"class":738},"sTEyZ"," definePlugin",[724,741,742],{"class":734}," }",[724,744,745],{"class":730}," from",[724,747,748],{"class":734}," '",[724,750,642],{"class":751},"sfazB",[724,753,754],{"class":734},"'\n",[724,756,758],{"class":726,"line":757},2,[724,759,761],{"emptyLinePlaceholder":760},true,"\n",[724,763,765,768,772,775,778,781,784],{"class":726,"line":764},3,[724,766,767],{"class":730},"export",[724,769,771],{"class":770},"spNyl"," const",[724,773,774],{"class":738}," tenantPlugin ",[724,776,777],{"class":734},"=",[724,779,739],{"class":780},"s2Zo4",[724,782,783],{"class":738},"(",[724,785,786],{"class":734},"{\n",[724,788,790,794,797,799,802,805],{"class":726,"line":789},4,[724,791,793],{"class":792},"swJcz","  name",[724,795,796],{"class":734},":",[724,798,748],{"class":734},[724,800,801],{"class":751},"tenant",[724,803,804],{"class":734},"'",[724,806,807],{"class":734},",\n",[724,809,811,814,817,821,824,827,830],{"class":726,"line":810},5,[724,812,813],{"class":792},"  onRequestStart",[724,815,816],{"class":734},"({",[724,818,820],{"class":819},"sHdIc"," logger",[724,822,823],{"class":734},",",[724,825,826],{"class":819}," headers",[724,828,829],{"class":734}," })",[724,831,832],{"class":734}," {\n",[724,834,836,839,842,845,847,850,853,855,858,860],{"class":726,"line":835},6,[724,837,838],{"class":770},"    const",[724,840,841],{"class":738}," tenantId",[724,843,844],{"class":734}," =",[724,846,826],{"class":738},[724,848,849],{"class":734},"?.",[724,851,852],{"class":792},"[",[724,854,804],{"class":734},[724,856,857],{"class":751},"x-tenant-id",[724,859,804],{"class":734},[724,861,862],{"class":792},"]\n",[724,864,866,869,872,875,878,881,884,887,889,892,895,897,899,902,904,906,908,910],{"class":726,"line":865},7,[724,867,868],{"class":730},"    if",[724,870,871],{"class":792}," (",[724,873,874],{"class":738},"tenantId",[724,876,877],{"class":792},") ",[724,879,880],{"class":738},"logger",[724,882,883],{"class":734},".",[724,885,886],{"class":780},"set",[724,888,783],{"class":792},[724,890,891],{"class":734},"{",[724,893,894],{"class":792}," tenant",[724,896,796],{"class":734},[724,898,735],{"class":734},[724,900,901],{"class":792}," id",[724,903,796],{"class":734},[724,905,841],{"class":738},[724,907,742],{"class":734},[724,909,742],{"class":734},[724,911,912],{"class":792},")\n",[724,914,916],{"class":726,"line":915},8,[724,917,918],{"class":734},"  },\n",[724,920,922,925,927,930,932],{"class":726,"line":921},9,[724,923,924],{"class":792},"  enrich",[724,926,816],{"class":734},[724,928,929],{"class":819}," event",[724,931,829],{"class":734},[724,933,832],{"class":734},[724,935,937,940,942,945,947,950,952,955,957],{"class":726,"line":936},10,[724,938,939],{"class":738},"    event",[724,941,883],{"class":734},[724,943,944],{"class":738},"region",[724,946,844],{"class":734},[724,948,949],{"class":738}," process",[724,951,883],{"class":734},[724,953,954],{"class":738},"env",[724,956,883],{"class":734},[724,958,959],{"class":738},"REGION\n",[724,961,963],{"class":726,"line":962},11,[724,964,918],{"class":734},[724,966,968,971],{"class":726,"line":967},12,[724,969,970],{"class":734},"}",[724,972,912],{"class":738},[590,974,975],{},"Register the plugin where you bootstrap evlog. The shape depends on your runtime:",[977,978,979,1049,1127],"code-group",{},[715,980,983],{"className":717,"code":981,"filename":982,"language":719,"meta":720,"style":720},"import { initLogger } from 'evlog'\nimport { tenantPlugin } from '.\u002Fplugins\u002Ftenant'\n\ninitLogger({ plugins: [tenantPlugin] })\n","Next.js \u002F standalone",[593,984,985,1004,1024,1028],{"__ignoreMap":720},[724,986,987,989,991,994,996,998,1000,1002],{"class":726,"line":727},[724,988,731],{"class":730},[724,990,735],{"class":734},[724,992,993],{"class":738}," initLogger",[724,995,742],{"class":734},[724,997,745],{"class":730},[724,999,748],{"class":734},[724,1001,642],{"class":751},[724,1003,754],{"class":734},[724,1005,1006,1008,1010,1013,1015,1017,1019,1022],{"class":726,"line":757},[724,1007,731],{"class":730},[724,1009,735],{"class":734},[724,1011,1012],{"class":738}," tenantPlugin",[724,1014,742],{"class":734},[724,1016,745],{"class":730},[724,1018,748],{"class":734},[724,1020,1021],{"class":751},".\u002Fplugins\u002Ftenant",[724,1023,754],{"class":734},[724,1025,1026],{"class":726,"line":764},[724,1027,761],{"emptyLinePlaceholder":760},[724,1029,1030,1033,1035,1037,1040,1042,1045,1047],{"class":726,"line":789},[724,1031,1032],{"class":780},"initLogger",[724,1034,783],{"class":738},[724,1036,891],{"class":734},[724,1038,1039],{"class":792}," plugins",[724,1041,796],{"class":734},[724,1043,1044],{"class":738}," [tenantPlugin] ",[724,1046,970],{"class":734},[724,1048,912],{"class":738},[715,1050,1053],{"className":717,"code":1051,"filename":1052,"language":719,"meta":720,"style":720},"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",[593,1054,1055,1075,1093,1097],{"__ignoreMap":720},[724,1056,1057,1059,1061,1064,1066,1068,1070,1073],{"class":726,"line":727},[724,1058,731],{"class":730},[724,1060,735],{"class":734},[724,1062,1063],{"class":738}," evlogMiddleware",[724,1065,742],{"class":734},[724,1067,745],{"class":730},[724,1069,748],{"class":734},[724,1071,1072],{"class":751},"evlog\u002F\u003Cframework>",[724,1074,754],{"class":734},[724,1076,1077,1079,1081,1083,1085,1087,1089,1091],{"class":726,"line":757},[724,1078,731],{"class":730},[724,1080,735],{"class":734},[724,1082,1012],{"class":738},[724,1084,742],{"class":734},[724,1086,745],{"class":730},[724,1088,748],{"class":734},[724,1090,1021],{"class":751},[724,1092,754],{"class":734},[724,1094,1095],{"class":726,"line":764},[724,1096,761],{"emptyLinePlaceholder":760},[724,1098,1099,1102,1104,1107,1109,1112,1114,1116,1118,1120,1122,1124],{"class":726,"line":789},[724,1100,1101],{"class":738},"app",[724,1103,883],{"class":734},[724,1105,1106],{"class":780},"use",[724,1108,783],{"class":738},[724,1110,1111],{"class":780},"evlogMiddleware",[724,1113,783],{"class":738},[724,1115,891],{"class":734},[724,1117,1039],{"class":792},[724,1119,796],{"class":734},[724,1121,1044],{"class":738},[724,1123,970],{"class":734},[724,1125,1126],{"class":738},"))\n",[715,1128,1130],{"className":717,"code":1129,"filename":255,"language":719,"meta":720,"style":720},"\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",[593,1131,1132,1138,1175],{"__ignoreMap":720},[724,1133,1134],{"class":726,"line":727},[724,1135,1137],{"class":1136},"sHwdD","\u002F\u002F Register the hooks you actually use directly:\n",[724,1139,1140,1143,1145,1148,1150,1153,1155,1157,1160,1162,1164,1166,1168,1170,1173],{"class":726,"line":757},[724,1141,1142],{"class":738},"nitroApp",[724,1144,883],{"class":734},[724,1146,1147],{"class":738},"hooks",[724,1149,883],{"class":734},[724,1151,1152],{"class":780},"hook",[724,1154,783],{"class":738},[724,1156,804],{"class":734},[724,1158,1159],{"class":751},"evlog:enrich",[724,1161,804],{"class":734},[724,1163,823],{"class":734},[724,1165,1012],{"class":738},[724,1167,883],{"class":734},[724,1169,650],{"class":738},[724,1171,1172],{"class":734},"!",[724,1174,912],{"class":738},[724,1176,1177,1179,1181,1183,1185,1187,1189,1191,1194,1196,1198,1200,1202,1204,1206],{"class":726,"line":764},[724,1178,1142],{"class":738},[724,1180,883],{"class":734},[724,1182,1147],{"class":738},[724,1184,883],{"class":734},[724,1186,1152],{"class":780},[724,1188,783],{"class":738},[724,1190,804],{"class":734},[724,1192,1193],{"class":751},"evlog:request:start",[724,1195,804],{"class":734},[724,1197,823],{"class":734},[724,1199,1012],{"class":738},[724,1201,883],{"class":734},[724,1203,646],{"class":738},[724,1205,1172],{"class":734},[724,1207,912],{"class":738},[710,1209,1210],{"id":1147},"Hooks",[1212,1213,1214,1230],"table",{},[1215,1216,1217],"thead",{},[1218,1219,1220,1224,1227],"tr",{},[1221,1222,1223],"th",{},"Hook",[1221,1225,1226],{},"When",[1221,1228,1229],{},"Use it for",[1231,1232,1233,1250,1265,1278,1298,1311,1324,1337],"tbody",{},[1218,1234,1235,1241,1244],{},[1236,1237,1238],"td",{},[593,1239,1240],{},"setup(ctx)",[1236,1242,1243],{},"Once when registered",[1236,1245,1246,1247,1249],{},"Read ",[593,1248,954],{},", set up shared state",[1218,1251,1252,1257,1260],{},[1236,1253,1254],{},[593,1255,1256],{},"onRequestStart(ctx)",[1236,1258,1259],{},"Each request, before any handler runs",[1236,1261,1262,1263],{},"Pull values from headers into ",[593,1264,880],{},[1218,1266,1267,1272,1275],{},[1236,1268,1269],{},[593,1270,1271],{},"enrich(ctx)",[1236,1273,1274],{},"Every event, before drain",[1236,1276,1277],{},"Add derived fields (geo, deploy id…)",[1218,1279,1280,1285,1288],{},[1236,1281,1282],{},[593,1283,1284],{},"keep(ctx)",[1236,1286,1287],{},"Tail sampling decision",[1236,1289,1290,1291,647,1294,1297],{},"Force-keep based on outcome (",[593,1292,1293],{},"status >= 400",[593,1295,1296],{},"duration > 500",", …)",[1218,1299,1300,1305,1308],{},[1236,1301,1302],{},[593,1303,1304],{},"drain(ctx)",[1236,1306,1307],{},"Every emitted event",[1236,1309,1310],{},"Side-effect: alert, mirror to a queue, etc.",[1218,1312,1313,1318,1321],{},[1236,1314,1315],{},[593,1316,1317],{},"onRequestFinish(ctx)",[1236,1319,1320],{},"After response",[1236,1322,1323],{},"Per-request post-processing",[1218,1325,1326,1331,1334],{},[1236,1327,1328],{},[593,1329,1330],{},"onClientLog(ctx)",[1236,1332,1333],{},"Browser-submitted event hits the ingest endpoint",[1236,1335,1336],{},"Observe \u002F reject client traffic",[1218,1338,1339,1344,1347],{},[1236,1340,1341],{},[593,1342,1343],{},"extendLogger(logger)",[1236,1345,1346],{},"Each request",[1236,1348,1349,1350,666],{},"Add custom methods (e.g. ",[593,1351,1352],{},"logger.audit.refund()",[590,1354,1355,1356,1359,1360,883],{},"Every hook is ",[598,1357,1358],{},"optional",". A plugin can implement any subset. The full type lives in ",[606,1361,1364],{"href":1362,"rel":1363},"https:\u002F\u002Fgithub.com\u002Fevloghq\u002Fevlog\u002Fblob\u002Fmain\u002Fpackages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[708],[593,1365,1366],{},"packages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[710,1368,1370],{"id":1369},"a-multi-hook-example","A multi-hook example",[590,1372,1373,1374,1377,1378,647,1381,1383,1384,796],{},"Plugins shine when several concerns share state. Here, a single ",[593,1375,1376],{},"request-metrics"," plugin tracks per-request timing through ",[593,1379,1380],{},"setup",[593,1382,646],{},", and ",[593,1385,653],{},[715,1387,1389],{"className":717,"code":1388,"language":719,"meta":720,"style":720},"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    if (event.durationMs !== undefined) event.tier = event.durationMs > 1000 ? 'slow' : 'fast'\n  },\n\n  drain({ event }) {\n    if (event.durationMs !== undefined) {\n      statsd.timing('http.request', event.durationMs, { path: event.path as string })\n    }\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",[593,1390,1391,1410,1414,1431,1445,1449,1463,1492,1496,1500,1512,1576,1580,1585,1599,1620,1675,1681,1686,1691,1709,1752,1757,1762,1781,1827,1833,1838,1843],{"__ignoreMap":720},[724,1392,1393,1395,1397,1399,1401,1403,1405,1408],{"class":726,"line":727},[724,1394,731],{"class":730},[724,1396,735],{"class":734},[724,1398,739],{"class":738},[724,1400,742],{"class":734},[724,1402,745],{"class":730},[724,1404,748],{"class":734},[724,1406,1407],{"class":751},"evlog\u002Ftoolkit",[724,1409,754],{"class":734},[724,1411,1412],{"class":726,"line":757},[724,1413,761],{"emptyLinePlaceholder":760},[724,1415,1416,1418,1420,1423,1425,1427,1429],{"class":726,"line":764},[724,1417,767],{"class":730},[724,1419,771],{"class":770},[724,1421,1422],{"class":738}," requestMetricsPlugin 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Error isolation and merging are handled.",1789074371643]