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When you need a destination that isn't covered, you write your own.",[574,588,589],{},"Two factories cover every case:",[591,592,593,606],"table",{},[594,595,596],"thead",{},[597,598,599,603],"tr",{},[600,601,602],"th",{},"You have…",[600,604,605],{},"Use",[607,608,609,628],"tbody",{},[597,610,611,620],{},[612,613,614,615,619],"td",{},"An HTTP backend (REST, JSON ingest, vendor ",[616,617,618],"code",{},"\u002Fv1\u002Flogs"," endpoint)",[612,621,622],{},[583,623,625],{"href":624},"#definehttpdrain-the-http-recipe",[616,626,627],{},"defineHttpDrain",[597,629,630,633],{},[612,631,632],{},"A non-HTTP transport (gRPC, WebSocket, vendor SDK, queue, raw socket)",[612,634,635],{},[583,636,638],{"href":637},"#definedrain-non-http-transports",[616,639,640],{},"defineDrain",[574,642,643,644,647],{},"Both come from ",[616,645,646],{},"evlog\u002Ftoolkit"," and are the exact factories every built-in adapter uses.",[649,650,654,657,756],"prompt",{":actions":651,"description":652,"icon":653},"[\"copy\",\"cursor\",\"claude\"]","Build a custom evlog drain","i-lucide-code-2",[574,655,656],{},"Build a custom evlog drain that ships wide events to a backend without a built-in adapter.",[658,659,660,675,686,701,719,734,739,749],"ul",{},[661,662,663,664,667,668,670,671,674],"li",{},"For HTTP backends, use ",[616,665,666],{},"defineHttpDrain({ name, resolve, encode })"," from ",[616,669,646],{},", and never call ",[616,672,673],{},"fetch"," directly",[661,676,677,678,681,682,685],{},"For non-HTTP transports (queue, DB, native SDK, raw socket), use ",[616,679,680],{},"defineDrain({ name, send })"," and implement ",[616,683,684],{},"send(events)"," myself",[661,687,688,689,692,693,696,697,700],{},"Resolve config lazily inside ",[616,690,691],{},"resolve()"," via ",[616,694,695],{},"resolveAdapterConfig(namespace, fields, overrides)"," so users get the standard precedence (overrides → ",[616,698,699],{},"runtimeConfig.evlog.\u003Cns>"," → env)",[661,702,703,704,707,708,711,712,715,716],{},"Use the standardized field names: ",[616,705,706],{},"apiKey"," for bearer secrets, ",[616,709,710],{},"endpoint"," for the base URL, ",[616,713,714],{},"serviceName",", ",[616,717,718],{},"timeout",[661,720,721,722,725,726,729,730,733],{},"Encode batched events into the destination's wire format inside ",[616,723,724],{},"encode(events, config)",", return ",[616,727,728],{},"{ url, headers, body }"," (or ",[616,731,732],{},"null"," to opt out of the batch)",[661,735,736,738],{},[616,737,627],{}," handles retries, timeouts, error isolation, batching, and identity headers. Don't reimplement them",[661,740,741,742,745,746,748],{},"Wire the drain via ",[616,743,744],{},"defineEvlog({ drain: createMyDrain() })"," or my framework's middleware ",[616,747,580],{}," option",[661,750,751,752,755],{},"For production, wrap the result in ",[616,753,754],{},"createDrainPipeline"," for batching + retries",[574,757,758,759,764,765],{},"Docs: ",[583,760,761],{"href":761,"rel":762},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Fcustom-drains",[763],"nofollow","\nPipeline: ",[583,766,767],{"href":767,"rel":768},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Fdrain-pipeline",[763],[770,771,773,775],"h2",{"id":772},"definehttpdrain-the-http-recipe",[616,774,627],{}," (the HTTP recipe)",[574,777,778,779,781,782,784,785,788],{},"The recipe every built-in adapter follows. Two pure functions: ",[616,780,691],{}," returns the config (or ",[616,783,732],{}," to skip), ",[616,786,787],{},"encode()"," returns the HTTP request payload.",[790,791,792],"code-collapse",{},[793,794,800],"pre",{"className":795,"code":796,"filename":797,"language":798,"meta":799,"style":799},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import {\n  defineHttpDrain,\n  resolveAdapterConfig,\n  type ConfigField,\n} from 'evlog\u002Ftoolkit'\n\ninterface MyServiceConfig {\n  apiKey: string\n  endpoint?: string\n  timeout?: number\n}\n\nconst FIELDS: ConfigField\u003CMyServiceConfig>[] = [\n  { key: 'apiKey', env: ['MYSERVICE_API_KEY'] },\n  { key: 'endpoint', env: ['MYSERVICE_ENDPOINT'] },\n  { key: 'timeout' },\n]\n\nexport function createMyServiceDrain(overrides?: Partial\u003CMyServiceConfig>) {\n  return defineHttpDrain\u003CMyServiceConfig>({\n    name: 'myservice',\n    resolve: async () => {\n      const cfg = await resolveAdapterConfig\u003CMyServiceConfig>('myservice', FIELDS, overrides)\n      if (!cfg.apiKey) {\n        console.error('[evlog\u002Fmyservice] Missing apiKey')\n        return null\n      }\n      return cfg as MyServiceConfig\n    },\n    encode: (events, cfg) => ({\n      url: `${cfg.endpoint ?? 'https:\u002F\u002Fapi.myservice.com'}\u002Fv1\u002Fingest`,\n      headers: {\n        'Content-Type': 'application\u002Fjson',\n        Authorization: `Bearer ${cfg.apiKey}`,\n      },\n      body: JSON.stringify(events),\n    }),\n  })\n}\n","lib\u002Fmy-drain.ts","typescript","",[616,801,802,815,825,833,844,862,869,882,895,906,917,923,928,959,1001,1035,1053,1059,1064,1098,1118,1135,1154,1198,1223,1245,1254,1260,1274,1280,1306,1343,1353,1375,1403,1409,1433,1443,1451],{"__ignoreMap":799},[803,804,807,811],"span",{"class":805,"line":806},"line",1,[803,808,810],{"class":809},"s7zQu","import",[803,812,814],{"class":813},"sMK4o"," {\n",[803,816,818,822],{"class":805,"line":817},2,[803,819,821],{"class":820},"sTEyZ","  defineHttpDrain",[803,823,824],{"class":813},",\n",[803,826,828,831],{"class":805,"line":827},3,[803,829,830],{"class":820},"  resolveAdapterConfig",[803,832,824],{"class":813},[803,834,836,839,842],{"class":805,"line":835},4,[803,837,838],{"class":809},"  type",[803,840,841],{"class":820}," ConfigField",[803,843,824],{"class":813},[803,845,847,850,853,856,859],{"class":805,"line":846},5,[803,848,849],{"class":813},"}",[803,851,852],{"class":809}," from",[803,854,855],{"class":813}," '",[803,857,646],{"class":858},"sfazB",[803,860,861],{"class":813},"'\n",[803,863,865],{"class":805,"line":864},6,[803,866,868],{"emptyLinePlaceholder":867},true,"\n",[803,870,872,876,880],{"class":805,"line":871},7,[803,873,875],{"class":874},"spNyl","interface",[803,877,879],{"class":878},"sBMFI"," MyServiceConfig",[803,881,814],{"class":813},[803,883,885,889,892],{"class":805,"line":884},8,[803,886,888],{"class":887},"swJcz","  apiKey",[803,890,891],{"class":813},":",[803,893,894],{"class":878}," string\n",[803,896,898,901,904],{"class":805,"line":897},9,[803,899,900],{"class":887},"  endpoint",[803,902,903],{"class":813},"?:",[803,905,894],{"class":878},[803,907,909,912,914],{"class":805,"line":908},10,[803,910,911],{"class":887},"  timeout",[803,913,903],{"class":813},[803,915,916],{"class":878}," number\n",[803,918,920],{"class":805,"line":919},11,[803,921,922],{"class":813},"}\n",[803,924,926],{"class":805,"line":925},12,[803,927,868],{"emptyLinePlaceholder":867},[803,929,931,934,937,939,941,944,947,950,953,956],{"class":805,"line":930},13,[803,932,933],{"class":874},"const",[803,935,936],{"class":820}," FIELDS",[803,938,891],{"class":813},[803,940,841],{"class":878},[803,942,943],{"class":813},"\u003C",[803,945,946],{"class":878},"MyServiceConfig",[803,948,949],{"class":813},">",[803,951,952],{"class":820},"[] ",[803,954,955],{"class":813},"=",[803,957,958],{"class":820}," [\n",[803,960,962,965,968,970,972,974,977,980,983,985,988,990,993,995,998],{"class":805,"line":961},14,[803,963,964],{"class":813},"  {",[803,966,967],{"class":887}," key",[803,969,891],{"class":813},[803,971,855],{"class":813},[803,973,706],{"class":858},[803,975,976],{"class":813},"'",[803,978,979],{"class":813},",",[803,981,982],{"class":887}," env",[803,984,891],{"class":813},[803,986,987],{"class":820}," [",[803,989,976],{"class":813},[803,991,992],{"class":858},"MYSERVICE_API_KEY",[803,994,976],{"class":813},[803,996,997],{"class":820},"] ",[803,999,1000],{"class":813},"},\n",[803,1002,1004,1006,1008,1010,1012,1014,1016,1018,1020,1022,1024,1026,1029,1031,1033],{"class":805,"line":1003},15,[803,1005,964],{"class":813},[803,1007,967],{"class":887},[803,1009,891],{"class":813},[803,1011,855],{"class":813},[803,1013,710],{"class":858},[803,1015,976],{"class":813},[803,1017,979],{"class":813},[803,1019,982],{"class":887},[803,1021,891],{"class":813},[803,1023,987],{"class":820},[803,1025,976],{"class":813},[803,1027,1028],{"class":858},"MYSERVICE_ENDPOINT",[803,1030,976],{"class":813},[803,1032,997],{"class":820},[803,1034,1000],{"class":813},[803,1036,1038,1040,1042,1044,1046,1048,1050],{"class":805,"line":1037},16,[803,1039,964],{"class":813},[803,1041,967],{"class":887},[803,1043,891],{"class":813},[803,1045,855],{"class":813},[803,1047,718],{"class":858},[803,1049,976],{"class":813},[803,1051,1052],{"class":813}," },\n",[803,1054,1056],{"class":805,"line":1055},17,[803,1057,1058],{"class":820},"]\n",[803,1060,1062],{"class":805,"line":1061},18,[803,1063,868],{"emptyLinePlaceholder":867},[803,1065,1067,1070,1073,1077,1080,1084,1086,1089,1091,1093,1096],{"class":805,"line":1066},19,[803,1068,1069],{"class":809},"export",[803,1071,1072],{"class":874}," function",[803,1074,1076],{"class":1075},"s2Zo4"," createMyServiceDrain",[803,1078,1079],{"class":813},"(",[803,1081,1083],{"class":1082},"sHdIc","overrides",[803,1085,903],{"class":813},[803,1087,1088],{"class":878}," Partial",[803,1090,943],{"class":813},[803,1092,946],{"class":878},[803,1094,1095],{"class":813},">)",[803,1097,814],{"class":813},[803,1099,1101,1104,1107,1109,1111,1113,1115],{"class":805,"line":1100},20,[803,1102,1103],{"class":809},"  return",[803,1105,1106],{"class":1075}," defineHttpDrain",[803,1108,943],{"class":813},[803,1110,946],{"class":878},[803,1112,949],{"class":813},[803,1114,1079],{"class":887},[803,1116,1117],{"class":813},"{\n",[803,1119,1121,1124,1126,1128,1131,1133],{"class":805,"line":1120},21,[803,1122,1123],{"class":887},"    name",[803,1125,891],{"class":813},[803,1127,855],{"class":813},[803,1129,1130],{"class":858},"myservice",[803,1132,976],{"class":813},[803,1134,824],{"class":813},[803,1136,1138,1141,1143,1146,1149,1152],{"class":805,"line":1137},22,[803,1139,1140],{"class":1075},"    resolve",[803,1142,891],{"class":813},[803,1144,1145],{"class":874}," async",[803,1147,1148],{"class":813}," ()",[803,1150,1151],{"class":874}," =>",[803,1153,814],{"class":813},[803,1155,1157,1160,1163,1166,1169,1172,1174,1176,1178,1180,1182,1184,1186,1188,1190,1192,1195],{"class":805,"line":1156},23,[803,1158,1159],{"class":874},"      const",[803,1161,1162],{"class":820}," cfg",[803,1164,1165],{"class":813}," =",[803,1167,1168],{"class":809}," await",[803,1170,1171],{"class":1075}," resolveAdapterConfig",[803,1173,943],{"class":813},[803,1175,946],{"class":878},[803,1177,949],{"class":813},[803,1179,1079],{"class":887},[803,1181,976],{"class":813},[803,1183,1130],{"class":858},[803,1185,976],{"class":813},[803,1187,979],{"class":813},[803,1189,936],{"class":820},[803,1191,979],{"class":813},[803,1193,1194],{"class":820}," overrides",[803,1196,1197],{"class":887},")\n",[803,1199,1201,1204,1207,1210,1213,1216,1218,1221],{"class":805,"line":1200},24,[803,1202,1203],{"class":809},"      if",[803,1205,1206],{"class":887}," (",[803,1208,1209],{"class":813},"!",[803,1211,1212],{"class":820},"cfg",[803,1214,1215],{"class":813},".",[803,1217,706],{"class":820},[803,1219,1220],{"class":887},") ",[803,1222,1117],{"class":813},[803,1224,1226,1229,1231,1234,1236,1238,1241,1243],{"class":805,"line":1225},25,[803,1227,1228],{"class":820},"        console",[803,1230,1215],{"class":813},[803,1232,1233],{"class":1075},"error",[803,1235,1079],{"class":887},[803,1237,976],{"class":813},[803,1239,1240],{"class":858},"[evlog\u002Fmyservice] Missing apiKey",[803,1242,976],{"class":813},[803,1244,1197],{"class":887},[803,1246,1248,1251],{"class":805,"line":1247},26,[803,1249,1250],{"class":809},"        return",[803,1252,1253],{"class":813}," null\n",[803,1255,1257],{"class":805,"line":1256},27,[803,1258,1259],{"class":813},"      }\n",[803,1261,1263,1266,1268,1271],{"class":805,"line":1262},28,[803,1264,1265],{"class":809},"      return",[803,1267,1162],{"class":820},[803,1269,1270],{"class":809}," as",[803,1272,1273],{"class":878}," MyServiceConfig\n",[803,1275,1277],{"class":805,"line":1276},29,[803,1278,1279],{"class":813},"    },\n",[803,1281,1283,1286,1288,1290,1293,1295,1297,1300,1302,1304],{"class":805,"line":1282},30,[803,1284,1285],{"class":1075},"    encode",[803,1287,891],{"class":813},[803,1289,1206],{"class":813},[803,1291,1292],{"class":1082},"events",[803,1294,979],{"class":813},[803,1296,1162],{"class":1082},[803,1298,1299],{"class":813},")",[803,1301,1151],{"class":874},[803,1303,1206],{"class":887},[803,1305,1117],{"class":813},[803,1307,1309,1312,1314,1317,1319,1321,1324,1327,1329,1332,1335,1338,1341],{"class":805,"line":1308},31,[803,1310,1311],{"class":887},"      url",[803,1313,891],{"class":813},[803,1315,1316],{"class":813}," `${",[803,1318,1212],{"class":820},[803,1320,1215],{"class":813},[803,1322,1323],{"class":820},"endpoint ",[803,1325,1326],{"class":813},"??",[803,1328,855],{"class":813},[803,1330,1331],{"class":858},"https:\u002F\u002Fapi.myservice.com",[803,1333,1334],{"class":813},"'}",[803,1336,1337],{"class":858},"\u002Fv1\u002Fingest",[803,1339,1340],{"class":813},"`",[803,1342,824],{"class":813},[803,1344,1346,1349,1351],{"class":805,"line":1345},32,[803,1347,1348],{"class":887},"      headers",[803,1350,891],{"class":813},[803,1352,814],{"class":813},[803,1354,1356,1359,1362,1364,1366,1368,1371,1373],{"class":805,"line":1355},33,[803,1357,1358],{"class":813},"        '",[803,1360,1361],{"class":887},"Content-Type",[803,1363,976],{"class":813},[803,1365,891],{"class":813},[803,1367,855],{"class":813},[803,1369,1370],{"class":858},"application\u002Fjson",[803,1372,976],{"class":813},[803,1374,824],{"class":813},[803,1376,1378,1381,1383,1386,1389,1392,1394,1396,1398,1401],{"class":805,"line":1377},34,[803,1379,1380],{"class":887},"        Authorization",[803,1382,891],{"class":813},[803,1384,1385],{"class":813}," `",[803,1387,1388],{"class":858},"Bearer ",[803,1390,1391],{"class":813},"${",[803,1393,1212],{"class":820},[803,1395,1215],{"class":813},[803,1397,706],{"class":820},[803,1399,1400],{"class":813},"}`",[803,1402,824],{"class":813},[803,1404,1406],{"class":805,"line":1405},35,[803,1407,1408],{"class":813},"      },\n",[803,1410,1412,1415,1417,1420,1422,1425,1427,1429,1431],{"class":805,"line":1411},36,[803,1413,1414],{"class":887},"      body",[803,1416,891],{"class":813},[803,1418,1419],{"class":820}," JSON",[803,1421,1215],{"class":813},[803,1423,1424],{"class":1075},"stringify",[803,1426,1079],{"class":887},[803,1428,1292],{"class":820},[803,1430,1299],{"class":887},[803,1432,824],{"class":813},[803,1434,1436,1439,1441],{"class":805,"line":1435},37,[803,1437,1438],{"class":813},"    }",[803,1440,1299],{"class":887},[803,1442,824],{"class":813},[803,1444,1446,1449],{"class":805,"line":1445},38,[803,1447,1448],{"class":813},"  }",[803,1450,1197],{"class":887},[803,1452,1454],{"class":805,"line":1453},39,[803,1455,922],{"class":813},[574,1457,1458,1459,1461,1462,1465,1466,1469,1470,1474,1475,1478],{},"That's it. ",[616,1460,627],{}," handles retries (default 2), timeouts (default 5000ms), error isolation, and the identity headers (",[616,1463,1464],{},"User-Agent: evlog\u002F\u003Cversion>"," + ",[616,1467,1468],{},"X-Evlog-Source: \u003Cname>","). Your app pipeline keeps running even if your destination is down, and when you wrap the drain in ",[583,1471,1472],{"href":500},[616,1473,754],{},", the pipeline takes over retries through the drain's ",[616,1476,1477],{},"raw"," variant.",[1480,1481,1483],"h3",{"id":1482},"a-5-minute-example-internal-loki-drain","A 5-minute example: internal Loki drain",[574,1485,1486],{},"A complete working drain in 25 lines, with no external config helper:",[793,1488,1493],{"className":1489,"code":1490,"filename":1491,"language":1492,"meta":799,"style":799},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { defineHttpDrain } from 'evlog\u002Ftoolkit'\n\nexport function createLokiDrain(overrides?: { url?: string, token?: string }) {\n  return defineHttpDrain\u003C{ url: string, token: string }>({\n    name: 'loki',\n    resolve: () => ({\n      url: overrides?.url ?? process.env.LOKI_URL!,\n      token: overrides?.token ?? process.env.LOKI_TOKEN!,\n    }),\n    encode: (events, config) => ({\n      url: `${config.url}\u002Floki\u002Fapi\u002Fv1\u002Fpush`,\n      headers: {\n        'Content-Type': 'application\u002Fjson',\n        Authorization: `Bearer ${config.token}`,\n      },\n      body: JSON.stringify({\n        streams: events.map(e => ({\n          stream: { service: e.service, level: e.level },\n          values: [[String(Date.parse(e.timestamp) * 1e6), JSON.stringify(e)]],\n        })),\n      }),\n    }),\n  })\n}\n","lib\u002Floki-drain.ts","ts",[616,1494,1495,1515,1519,1558,1588,1603,1617,1650,1679,1687,1710,1734,1742,1760,1782,1786,1802,1827,1865,1925,1935,1944,1952,1958],{"__ignoreMap":799},[803,1496,1497,1499,1502,1504,1507,1509,1511,1513],{"class":805,"line":806},[803,1498,810],{"class":809},[803,1500,1501],{"class":813}," {",[803,1503,1106],{"class":820},[803,1505,1506],{"class":813}," }",[803,1508,852],{"class":809},[803,1510,855],{"class":813},[803,1512,646],{"class":858},[803,1514,861],{"class":813},[803,1516,1517],{"class":805,"line":817},[803,1518,868],{"emptyLinePlaceholder":867},[803,1520,1521,1523,1525,1528,1530,1532,1534,1536,1539,1541,1544,1546,1549,1551,1553,1556],{"class":805,"line":827},[803,1522,1069],{"class":809},[803,1524,1072],{"class":874},[803,1526,1527],{"class":1075}," createLokiDrain",[803,1529,1079],{"class":813},[803,1531,1083],{"class":1082},[803,1533,903],{"class":813},[803,1535,1501],{"class":813},[803,1537,1538],{"class":887}," url",[803,1540,903],{"class":813},[803,1542,1543],{"class":878}," string",[803,1545,979],{"class":813},[803,1547,1548],{"class":887}," token",[803,1550,903],{"class":813},[803,1552,1543],{"class":878},[803,1554,1555],{"class":813}," 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token",[803,1656,891],{"class":813},[803,1658,1194],{"class":820},[803,1660,1627],{"class":813},[803,1662,1663],{"class":820},"token",[803,1665,1633],{"class":813},[803,1667,1636],{"class":820},[803,1669,1215],{"class":813},[803,1671,1641],{"class":820},[803,1673,1215],{"class":813},[803,1675,1676],{"class":820},"LOKI_TOKEN",[803,1678,1649],{"class":813},[803,1680,1681,1683,1685],{"class":805,"line":897},[803,1682,1438],{"class":813},[803,1684,1299],{"class":887},[803,1686,824],{"class":813},[803,1688,1689,1691,1693,1695,1697,1699,1702,1704,1706,1708],{"class":805,"line":908},[803,1690,1285],{"class":1075},[803,1692,891],{"class":813},[803,1694,1206],{"class":813},[803,1696,1292],{"class":1082},[803,1698,979],{"class":813},[803,1700,1701],{"class":1082}," 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wins",[574,1967,1968,1970],{},[616,1969,695],{}," walks the standard chain so users get the same configuration UX as built-in adapters:",[1972,1973,1974,1980,1986,1992],"ol",{},[661,1975,1976,1977,1979],{},"Explicit ",[616,1978,1083],{}," passed to your factory",[661,1981,1982,1985],{},[616,1983,1984],{},"runtimeConfig.evlog.\u003Cnamespace>"," (Nuxt\u002FNitro)",[661,1987,1988,1991],{},[616,1989,1990],{},"runtimeConfig.\u003Cnamespace>"," (legacy Nuxt\u002FNitro)",[661,1993,1994,1997,1998,2001,2002,2005,2006,2008,2009,1299],{},[616,1995,1996],{},"\u003CNS>_\u003CFIELD>"," env vars (list ",[616,1999,2000],{},"NUXT_\u003CNS>_\u003CFIELD>"," in ",[616,2003,2004],{},"ConfigField.env"," for silent Nuxt compat; show only ",[616,2007,1996],{}," in error messages via ",[616,2010,2011],{},"formatPublicEnvKeys",[574,2013,2014,2015,715,2017,715,2019,715,2021,2023,2024,2026,2027,2029,2030,2033,2034,2037,2038,2041],{},"Field names should follow the project conventions: ",[616,2016,706],{},[616,2018,710],{},[616,2020,714],{},[616,2022,718],{},". If you're renaming an existing field (e.g. ",[616,2025,1663],{}," → ",[616,2028,706],{},"), keep both as ",[616,2031,2032],{},"ConfigField"," entries for one major version. See ",[616,2035,2036],{},"axiom.ts"," and ",[616,2039,2040],{},"better-stack.ts"," for the deprecation pattern.",[770,2043,2045],{"id":2044},"wire-the-drain-into-your-framework","Wire the drain into your framework",[574,2047,2048,2049,2052],{},"Once ",[616,2050,2051],{},"createMyServiceDrain()"," returns the drain, wire it like any other:",[2054,2055,2056,2169,2295,2353,2390,2421],"code-group",{},[793,2057,2060],{"className":795,"code":2058,"filename":2059,"language":798,"meta":799,"style":799},"\u002F\u002F server\u002Fplugins\u002Fevlog-drain.ts\nimport { createMyServiceDrain } from '~\u002Fserver\u002Futils\u002Fmy-drain'\n\nconst drain = createMyServiceDrain()\n\nexport default defineNitroPlugin((nitroApp) => {\n  nitroApp.hooks.hook('evlog:drain', drain)\n})\n","Nuxt \u002F Nitro",[616,2061,2062,2068,2087,2091,2105,2109,2132,2163],{"__ignoreMap":799},[803,2063,2064],{"class":805,"line":806},[803,2065,2067],{"class":2066},"sHwdD","\u002F\u002F server\u002Fplugins\u002Fevlog-drain.ts\n",[803,2069,2070,2072,2074,2076,2078,2080,2082,2085],{"class":805,"line":817},[803,2071,810],{"class":809},[803,2073,1501],{"class":813},[803,2075,1076],{"class":820},[803,2077,1506],{"class":813},[803,2079,852],{"class":809},[803,2081,855],{"class":813},[803,2083,2084],{"class":858},"~\u002Fserver\u002Futils\u002Fmy-drain",[803,2086,861],{"class":813},[803,2088,2089],{"class":805,"line":827},[803,2090,868],{"emptyLinePlaceholder":867},[803,2092,2093,2095,2098,2100,2102],{"class":805,"line":835},[803,2094,933],{"class":874},[803,2096,2097],{"class":820}," drain ",[803,2099,955],{"class":813},[803,2101,1076],{"class":1075},[803,2103,2104],{"class":820},"()\n",[803,2106,2107],{"class":805,"line":846},[803,2108,868],{"emptyLinePlaceholder":867},[803,2110,2111,2113,2116,2119,2121,2123,2126,2128,2130],{"class":805,"line":864},[803,2112,1069],{"class":809},[803,2114,2115],{"class":809}," default",[803,2117,2118],{"class":1075}," defineNitroPlugin",[803,2120,1079],{"class":820},[803,2122,1079],{"class":813},[803,2124,2125],{"class":1082},"nitroApp",[803,2127,1299],{"class":813},[803,2129,1151],{"class":874},[803,2131,814],{"class":813},[803,2133,2134,2137,2139,2142,2144,2147,2149,2151,2154,2156,2158,2161],{"class":805,"line":871},[803,2135,2136],{"class":820},"  nitroApp",[803,2138,1215],{"class":813},[803,2140,2141],{"class":820},"hooks",[803,2143,1215],{"class":813},[803,2145,2146],{"class":1075},"hook",[803,2148,1079],{"class":887},[803,2150,976],{"class":813},[803,2152,2153],{"class":858},"evlog:drain",[803,2155,976],{"class":813},[803,2157,979],{"class":813},[803,2159,2160],{"class":820}," drain",[803,2162,1197],{"class":887},[803,2164,2165,2167],{"class":805,"line":884},[803,2166,849],{"class":813},[803,2168,1197],{"class":820},[793,2170,2172],{"className":795,"code":2171,"filename":240,"language":798,"meta":799,"style":799},"\u002F\u002F lib\u002Fevlog.ts\nimport { createEvlog } from 'evlog\u002Fnext'\nimport { createMyServiceDrain } from '.\u002Fmy-drain'\n\nexport const { withEvlog, useLogger, log, createError } = createEvlog({\n  service: 'my-app',\n  drain: createMyServiceDrain(),\n})\n",[616,2173,2174,2179,2199,2218,2222,2259,2275,2289],{"__ignoreMap":799},[803,2175,2176],{"class":805,"line":806},[803,2177,2178],{"class":2066},"\u002F\u002F lib\u002Fevlog.ts\n",[803,2180,2181,2183,2185,2188,2190,2192,2194,2197],{"class":805,"line":817},[803,2182,810],{"class":809},[803,2184,1501],{"class":813},[803,2186,2187],{"class":820}," createEvlog",[803,2189,1506],{"class":813},[803,2191,852],{"class":809},[803,2193,855],{"class":813},[803,2195,2196],{"class":858},"evlog\u002Fnext",[803,2198,861],{"class":813},[803,2200,2201,2203,2205,2207,2209,2211,2213,2216],{"class":805,"line":827},[803,2202,810],{"class":809},[803,2204,1501],{"class":813},[803,2206,1076],{"class":820},[803,2208,1506],{"class":813},[803,2210,852],{"class":809},[803,2212,855],{"class":813},[803,2214,2215],{"class":858},".\u002Fmy-drain",[803,2217,861],{"class":813},[803,2219,2220],{"class":805,"line":835},[803,2221,868],{"emptyLinePlaceholder":867},[803,2223,2224,2226,2229,2231,2234,2236,2239,2241,2244,2246,2249,2251,2253,2255,2257],{"class":805,"line":846},[803,2225,1069],{"class":809},[803,2227,2228],{"class":874}," const",[803,2230,1501],{"class":813},[803,2232,2233],{"class":820}," withEvlog",[803,2235,979],{"class":813},[803,2237,2238],{"class":820}," useLogger",[803,2240,979],{"class":813},[803,2242,2243],{"class":820}," log",[803,2245,979],{"class":813},[803,2247,2248],{"class":820}," createError ",[803,2250,849],{"class":813},[803,2252,1165],{"class":813},[803,2254,2187],{"class":1075},[803,2256,1079],{"class":820},[803,2258,1117],{"class":813},[803,2260,2261,2264,2266,2268,2271,2273],{"class":805,"line":864},[803,2262,2263],{"class":887},"  service",[803,2265,891],{"class":813},[803,2267,855],{"class":813},[803,2269,2270],{"class":858},"my-app",[803,2272,976],{"class":813},[803,2274,824],{"class":813},[803,2276,2277,2280,2282,2284,2287],{"class":805,"line":871},[803,2278,2279],{"class":887},"  drain",[803,2281,891],{"class":813},[803,2283,1076],{"class":1075},[803,2285,2286],{"class":820},"()",[803,2288,824],{"class":813},[803,2290,2291,2293],{"class":805,"line":884},[803,2292,849],{"class":813},[803,2294,1197],{"class":820},[793,2296,2299],{"className":795,"code":2297,"filename":2298,"language":798,"meta":799,"style":799},"import { createMyServiceDrain } from '.\u002Fmy-drain'\napp.use(evlog({ drain: createMyServiceDrain() }))\n","Hono \u002F Express \u002F Elysia",[616,2300,2301,2319],{"__ignoreMap":799},[803,2302,2303,2305,2307,2309,2311,2313,2315,2317],{"class":805,"line":806},[803,2304,810],{"class":809},[803,2306,1501],{"class":813},[803,2308,1076],{"class":820},[803,2310,1506],{"class":813},[803,2312,852],{"class":809},[803,2314,855],{"class":813},[803,2316,2215],{"class":858},[803,2318,861],{"class":813},[803,2320,2321,2324,2326,2329,2331,2334,2336,2339,2341,2343,2345,2348,2350],{"class":805,"line":817},[803,2322,2323],{"class":820},"app",[803,2325,1215],{"class":813},[803,2327,2328],{"class":1075},"use",[803,2330,1079],{"class":820},[803,2332,2333],{"class":1075},"evlog",[803,2335,1079],{"class":820},[803,2337,2338],{"class":813},"{",[803,2340,2160],{"class":887},[803,2342,891],{"class":813},[803,2344,1076],{"class":1075},[803,2346,2347],{"class":820},"() ",[803,2349,849],{"class":813},[803,2351,2352],{"class":820},"))\n",[793,2354,2356],{"className":795,"code":2355,"filename":275,"language":798,"meta":799,"style":799},"await app.register(evlog, { drain: createMyServiceDrain() })\n",[616,2357,2358],{"__ignoreMap":799},[803,2359,2360,2363,2366,2368,2371,2374,2376,2378,2380,2382,2384,2386,2388],{"class":805,"line":806},[803,2361,2362],{"class":809},"await",[803,2364,2365],{"class":820}," app",[803,2367,1215],{"class":813},[803,2369,2370],{"class":1075},"register",[803,2372,2373],{"class":820},"(evlog",[803,2375,979],{"class":813},[803,2377,1501],{"class":813},[803,2379,2160],{"class":887},[803,2381,891],{"class":813},[803,2383,1076],{"class":1075},[803,2385,2347],{"class":820},[803,2387,849],{"class":813},[803,2389,1197],{"class":820},[793,2391,2393],{"className":795,"code":2392,"filename":260,"language":798,"meta":799,"style":799},"EvlogModule.forRoot({ drain: createMyServiceDrain() })\n",[616,2394,2395],{"__ignoreMap":799},[803,2396,2397,2400,2402,2405,2407,2409,2411,2413,2415,2417,2419],{"class":805,"line":806},[803,2398,2399],{"class":820},"EvlogModule",[803,2401,1215],{"class":813},[803,2403,2404],{"class":1075},"forRoot",[803,2406,1079],{"class":820},[803,2408,2338],{"class":813},[803,2410,2160],{"class":887},[803,2412,891],{"class":813},[803,2414,1076],{"class":1075},[803,2416,2347],{"class":820},[803,2418,849],{"class":813},[803,2420,1197],{"class":820},[793,2422,2424],{"className":795,"code":2423,"filename":295,"language":798,"meta":799,"style":799},"import { initLogger } from 'evlog'\nimport { createMyServiceDrain } from '.\u002Fmy-drain'\n\ninitLogger({ drain: createMyServiceDrain() })\n",[616,2425,2426,2445,2463,2467],{"__ignoreMap":799},[803,2427,2428,2430,2432,2435,2437,2439,2441,2443],{"class":805,"line":806},[803,2429,810],{"class":809},[803,2431,1501],{"class":813},[803,2433,2434],{"class":820}," initLogger",[803,2436,1506],{"class":813},[803,2438,852],{"class":809},[803,2440,855],{"class":813},[803,2442,2333],{"class":858},[803,2444,861],{"class":813},[803,2446,2447,2449,2451,2453,2455,2457,2459,2461],{"class":805,"line":817},[803,2448,810],{"class":809},[803,2450,1501],{"class":813},[803,2452,1076],{"class":820},[803,2454,1506],{"class":813},[803,2456,852],{"class":809},[803,2458,855],{"class":813},[803,2460,2215],{"class":858},[803,2462,861],{"class":813},[803,2464,2465],{"class":805,"line":827},[803,2466,868],{"emptyLinePlaceholder":867},[803,2468,2469,2472,2474,2476,2478,2480,2482,2484,2486],{"class":805,"line":835},[803,2470,2471],{"class":1075},"initLogger",[803,2473,1079],{"class":820},[803,2475,2338],{"class":813},[803,2477,2160],{"class":887},[803,2479,891],{"class":813},[803,2481,1076],{"class":1075},[803,2483,2347],{"class":820},[803,2485,849],{"class":813},[803,2487,1197],{"class":820},[574,2489,2490,2491,2495],{},"For production, wrap it once in ",[583,2492,2493],{"href":500},[616,2494,754],{}," so events are batched and retried.",[770,2497,2499],{"id":2498},"filter-or-transform-before-sending","Filter or transform before sending",[574,2501,2502,2504,2505,2508,2509,2511],{},[616,2503,787],{}," receives the full batch of ",[616,2506,2507],{},"WideEvent[]"," plus the resolved config. Filter or transform inline, and returning ",[616,2510,732],{}," is a clean opt-out for that batch:",[793,2513,2515],{"className":795,"code":2514,"language":798,"meta":799,"style":799},"encode: (events, cfg) => {\n  const filtered = events.filter(e => e.level === 'error' && e.path !== '\u002Fhealth')\n  if (filtered.length === 0) return null\n\n  const payload = filtered.map(e => ({\n    ts: new Date(e.timestamp).getTime(),\n    severity: e.level.toUpperCase(),\n    attributes: { method: e.method, path: e.path, status: e.status, durationMs: e.durationMs },\n  }))\n\n  return {\n    url: `${cfg.endpoint}\u002Fv1\u002Fpush`,\n    headers: { 'Content-Type': 'application\u002Fjson' },\n    body: JSON.stringify(payload),\n  }\n}\n",[616,2516,2517,2538,2598,2625,2629,2654,2686,2708,2772,2778,2782,2788,2812,2837,2859,2864],{"__ignoreMap":799},[803,2518,2519,2522,2524,2526,2528,2530,2532,2534,2536],{"class":805,"line":806},[803,2520,2521],{"class":878},"encode",[803,2523,891],{"class":813},[803,2525,1206],{"class":813},[803,2527,1292],{"class":1082},[803,2529,979],{"class":813},[803,2531,1162],{"class":1082},[803,2533,1299],{"class":813},[803,2535,1151],{"class":874},[803,2537,814],{"class":813},[803,2539,2540,2543,2546,2548,2550,2552,2555,2557,2559,2561,2563,2565,2567,2570,2572,2574,2576,2579,2581,2583,2586,2589,2591,2594,2596],{"class":805,"line":817},[803,2541,2542],{"class":874},"  const",[803,2544,2545],{"class":820}," filtered",[803,2547,1165],{"class":813},[803,2549,1811],{"class":820},[803,2551,1215],{"class":813},[803,2553,2554],{"class":1075},"filter",[803,2556,1079],{"class":887},[803,2558,1820],{"class":1082},[803,2560,1151],{"class":874},[803,2562,1843],{"class":820},[803,2564,1215],{"class":813},[803,2566,1862],{"class":820},[803,2568,2569],{"class":813}," ===",[803,2571,855],{"class":813},[803,2573,1233],{"class":858},[803,2575,976],{"class":813},[803,2577,2578],{"class":813}," &&",[803,2580,1843],{"class":820},[803,2582,1215],{"class":813},[803,2584,2585],{"class":820},"path",[803,2587,2588],{"class":813}," !==",[803,2590,855],{"class":813},[803,2592,2593],{"class":858},"\u002Fhealth",[803,2595,976],{"class":813},[803,2597,1197],{"class":887},[803,2599,2600,2603,2605,2608,2610,2613,2615,2618,2620,2623],{"class":805,"line":827},[803,2601,2602],{"class":809},"  if",[803,2604,1206],{"class":887},[803,2606,2607],{"class":820},"filtered",[803,2609,1215],{"class":813},[803,2611,2612],{"class":820},"length",[803,2614,2569],{"class":813},[803,2616,2617],{"class":1904}," 0",[803,2619,1220],{"class":887},[803,2621,2622],{"class":809},"return",[803,2624,1253],{"class":813},[803,2626,2627],{"class":805,"line":835},[803,2628,868],{"emptyLinePlaceholder":867},[803,2630,2631,2633,2636,2638,2640,2642,2644,2646,2648,2650,2652],{"class":805,"line":846},[803,2632,2542],{"class":874},[803,2634,2635],{"class":820}," payload",[803,2637,1165],{"class":813},[803,2639,2545],{"class":820},[803,2641,1215],{"class":813},[803,2643,94],{"class":1075},[803,2645,1079],{"class":887},[803,2647,1820],{"class":1082},[803,2649,1151],{"class":874},[803,2651,1206],{"class":887},[803,2653,1117],{"class":813},[803,2655,2656,2659,2661,2664,2667,2669,2671,2673,2675,2677,2679,2682,2684],{"class":805,"line":864},[803,2657,2658],{"class":887},"    ts",[803,2660,891],{"class":813},[803,2662,2663],{"class":813}," new",[803,2665,2666],{"class":1075}," Date",[803,2668,1079],{"class":887},[803,2670,1820],{"class":820},[803,2672,1215],{"class":813},[803,2674,1896],{"class":820},[803,2676,1299],{"class":887},[803,2678,1215],{"class":813},[803,2680,2681],{"class":1075},"getTime",[803,2683,2286],{"class":887},[803,2685,824],{"class":813},[803,2687,2688,2691,2693,2695,2697,2699,2701,2704,2706],{"class":805,"line":871},[803,2689,2690],{"class":887},"    severity",[803,2692,891],{"class":813},[803,2694,1843],{"class":820},[803,2696,1215],{"class":813},[803,2698,1862],{"class":820},[803,2700,1215],{"class":813},[803,2702,2703],{"class":1075},"toUpperCase",[803,2705,2286],{"class":887},[803,2707,824],{"class":813},[803,2709,2710,2713,2715,2717,2720,2722,2724,2726,2729,2731,2734,2736,2738,2740,2742,2744,2747,2749,2751,2753,2756,2758,2761,2763,2765,2767,2770],{"class":805,"line":884},[803,2711,2712],{"class":887},"    attributes",[803,2714,891],{"class":813},[803,2716,1501],{"class":813},[803,2718,2719],{"class":887}," method",[803,2721,891],{"class":813},[803,2723,1843],{"class":820},[803,2725,1215],{"class":813},[803,2727,2728],{"class":820},"method",[803,2730,979],{"class":813},[803,2732,2733],{"class":887}," path",[803,2735,891],{"class":813},[803,2737,1843],{"class":820},[803,2739,1215],{"class":813},[803,2741,2585],{"class":820},[803,2743,979],{"class":813},[803,2745,2746],{"class":887}," status",[803,2748,891],{"class":813},[803,2750,1843],{"class":820},[803,2752,1215],{"class":813},[803,2754,2755],{"class":820},"status",[803,2757,979],{"class":813},[803,2759,2760],{"class":887}," durationMs",[803,2762,891],{"class":813},[803,2764,1843],{"class":820},[803,2766,1215],{"class":813},[803,2768,2769],{"class":820},"durationMs",[803,2771,1052],{"class":813},[803,2773,2774,2776],{"class":805,"line":897},[803,2775,1448],{"class":813},[803,2777,2352],{"class":887},[803,2779,2780],{"class":805,"line":908},[803,2781,868],{"emptyLinePlaceholder":867},[803,2783,2784,2786],{"class":805,"line":919},[803,2785,1103],{"class":809},[803,2787,814],{"class":813},[803,2789,2790,2793,2795,2797,2799,2801,2803,2805,2808,2810],{"class":805,"line":925},[803,2791,2792],{"class":887},"    url",[803,2794,891],{"class":813},[803,2796,1316],{"class":813},[803,2798,1212],{"class":820},[803,2800,1215],{"class":813},[803,2802,710],{"class":820},[803,2804,849],{"class":813},[803,2806,2807],{"class":858},"\u002Fv1\u002Fpush",[803,2809,1340],{"class":813},[803,2811,824],{"class":813},[803,2813,2814,2817,2819,2821,2823,2825,2827,2829,2831,2833,2835],{"class":805,"line":930},[803,2815,2816],{"class":887},"    headers",[803,2818,891],{"class":813},[803,2820,1501],{"class":813},[803,2822,855],{"class":813},[803,2824,1361],{"class":887},[803,2826,976],{"class":813},[803,2828,891],{"class":813},[803,2830,855],{"class":813},[803,2832,1370],{"class":858},[803,2834,976],{"class":813},[803,2836,1052],{"class":813},[803,2838,2839,2842,2844,2846,2848,2850,2852,2855,2857],{"class":805,"line":961},[803,2840,2841],{"class":887},"    body",[803,2843,891],{"class":813},[803,2845,1419],{"class":820},[803,2847,1215],{"class":813},[803,2849,1424],{"class":1075},[803,2851,1079],{"class":887},[803,2853,2854],{"class":820},"payload",[803,2856,1299],{"class":887},[803,2858,824],{"class":813},[803,2860,2861],{"class":805,"line":1003},[803,2862,2863],{"class":813},"  }\n",[803,2865,2866],{"class":805,"line":1037},[803,2867,922],{"class":813},[770,2869,2871,2873],{"id":2870},"definedrain-non-http-transports",[616,2872,640],{}," (non-HTTP transports)",[574,2875,2876,2877,2879],{},"If your destination requires gRPC, a vendor SDK, a queue client, a WebSocket, or a raw socket, drop one level lower with ",[616,2878,640],{},". You own the transport; the toolkit still gives you config resolution, error isolation, and a consistent shape.",[793,2881,2883],{"className":795,"code":2882,"language":798,"meta":799,"style":799},"import { defineDrain } from 'evlog\u002Ftoolkit'\n\nexport const createCustomTransportDrain = () =>\n  defineDrain\u003C{ apiKey: string }>({\n    name: 'custom',\n    resolve: async () => ({ apiKey: process.env.MY_KEY! }),\n    send: async (events, cfg) => {\n      await myVendorSdk.publish(events, { token: cfg.apiKey })\n    },\n  })\n",[616,2884,2885,2904,2908,2924,2944,2959,2998,3021,3056,3060],{"__ignoreMap":799},[803,2886,2887,2889,2891,2894,2896,2898,2900,2902],{"class":805,"line":806},[803,2888,810],{"class":809},[803,2890,1501],{"class":813},[803,2892,2893],{"class":820}," defineDrain",[803,2895,1506],{"class":813},[803,2897,852],{"class":809},[803,2899,855],{"class":813},[803,2901,646],{"class":858},[803,2903,861],{"class":813},[803,2905,2906],{"class":805,"line":817},[803,2907,868],{"emptyLinePlaceholder":867},[803,2909,2910,2912,2914,2917,2919,2921],{"class":805,"line":827},[803,2911,1069],{"class":809},[803,2913,2228],{"class":874},[803,2915,2916],{"class":820}," createCustomTransportDrain ",[803,2918,955],{"class":813},[803,2920,1148],{"class":813},[803,2922,2923],{"class":874}," =>\n",[803,2925,2926,2929,2931,2934,2936,2938,2940,2942],{"class":805,"line":835},[803,2927,2928],{"class":1075},"  defineDrain",[803,2930,1566],{"class":813},[803,2932,2933],{"class":887}," apiKey",[803,2935,891],{"class":813},[803,2937,1543],{"class":878},[803,2939,1583],{"class":813},[803,2941,1079],{"class":820},[803,2943,1117],{"class":813},[803,2945,2946,2948,2950,2952,2955,2957],{"class":805,"line":846},[803,2947,1123],{"class":887},[803,2949,891],{"class":813},[803,2951,855],{"class":813},[803,2953,2954],{"class":858},"custom",[803,2956,976],{"class":813},[803,2958,824],{"class":813},[803,2960,2961,2963,2965,2967,2969,2971,2973,2975,2977,2979,2981,2983,2985,2987,2990,2992,2994,2996],{"class":805,"line":864},[803,2962,1140],{"class":1075},[803,2964,891],{"class":813},[803,2966,1145],{"class":874},[803,2968,1148],{"class":813},[803,2970,1151],{"class":874},[803,2972,1206],{"class":820},[803,2974,2338],{"class":813},[803,2976,2933],{"class":887},[803,2978,891],{"class":813},[803,2980,1636],{"class":820},[803,2982,1215],{"class":813},[803,2984,1641],{"class":820},[803,2986,1215],{"class":813},[803,2988,2989],{"class":820},"MY_KEY",[803,2991,1209],{"class":813},[803,2993,1506],{"class":813},[803,2995,1299],{"class":820},[803,2997,824],{"class":813},[803,2999,3000,3003,3005,3007,3009,3011,3013,3015,3017,3019],{"class":805,"line":871},[803,3001,3002],{"class":1075},"    send",[803,3004,891],{"class":813},[803,3006,1145],{"class":874},[803,3008,1206],{"class":813},[803,3010,1292],{"class":1082},[803,3012,979],{"class":813},[803,3014,1162],{"class":1082},[803,3016,1299],{"class":813},[803,3018,1151],{"class":874},[803,3020,814],{"class":813},[803,3022,3023,3026,3029,3031,3034,3036,3038,3040,3042,3044,3046,3048,3050,3052,3054],{"class":805,"line":884},[803,3024,3025],{"class":809},"      await",[803,3027,3028],{"class":820}," myVendorSdk",[803,3030,1215],{"class":813},[803,3032,3033],{"class":1075},"publish",[803,3035,1079],{"class":887},[803,3037,1292],{"class":820},[803,3039,979],{"class":813},[803,3041,1501],{"class":813},[803,3043,1548],{"class":887},[803,3045,891],{"class":813},[803,3047,1162],{"class":820},[803,3049,1215],{"class":813},[803,3051,706],{"class":820},[803,3053,1506],{"class":813},[803,3055,1197],{"class":887},[803,3057,3058],{"class":805,"line":897},[803,3059,1279],{"class":813},[803,3061,3062,3064],{"class":805,"line":908},[803,3063,1448],{"class":813},[803,3065,1197],{"class":820},[574,3067,3068,3069,3072,3073,3075,3076,3078,3079,3082,3083,3086,3087,3089],{},"Let ",[616,3070,3071],{},"send"," throw on failure. ",[616,3074,640],{}," handles the isolation: a direct call swallows the error and logs it with your drain's name, while the ",[616,3077,1477],{}," variant on the returned function rejects, which is how ",[583,3080,3081],{"href":500},"the pipeline","'s retry and ",[616,3084,3085],{},"onDropped"," observe failures. A ",[616,3088,3071],{}," that swallows its own errors makes your drain unretryable.",[770,3091,3093],{"id":3092},"what-a-draincontext-carries","What a DrainContext carries",[574,3095,3096,3097,3099,3100,3103],{},"When evlog calls your drain through ",[616,3098,2153],{},", it passes a ",[616,3101,3102],{},"DrainContext"," per event:",[793,3105,3108],{"className":795,"code":3106,"filename":3107,"language":798,"meta":799,"style":799},"interface DrainContext {\n  \u002F** The complete wide event with all accumulated context *\u002F\n  event: WideEvent\n\n  \u002F** Request metadata *\u002F\n  request?: {\n    method: string\n    path: string\n    requestId: string\n  }\n\n  \u002F** Safe HTTP headers (sensitive headers filtered) *\u002F\n  headers?: Record\u003Cstring, string>\n}\n\ninterface WideEvent {\n  timestamp: string\n  level: 'debug' | 'info' | 'warn' | 'error'\n  service: string\n  environment?: string\n  version?: string\n  region?: string\n  commitHash?: string\n  requestId?: string\n  \u002F\u002F ... plus all fields added via log.set()\n  [key: string]: unknown\n}\n","types.ts",[616,3109,3110,3119,3124,3134,3138,3143,3152,3161,3170,3179,3183,3187,3192,3214,3218,3222,3231,3240,3281,3289,3298,3307,3316,3325,3334,3339,3359],{"__ignoreMap":799},[803,3111,3112,3114,3117],{"class":805,"line":806},[803,3113,875],{"class":874},[803,3115,3116],{"class":878}," DrainContext",[803,3118,814],{"class":813},[803,3120,3121],{"class":805,"line":817},[803,3122,3123],{"class":2066},"  \u002F** The complete wide event with all accumulated context *\u002F\n",[803,3125,3126,3129,3131],{"class":805,"line":827},[803,3127,3128],{"class":887},"  event",[803,3130,891],{"class":813},[803,3132,3133],{"class":878}," WideEvent\n",[803,3135,3136],{"class":805,"line":835},[803,3137,868],{"emptyLinePlaceholder":867},[803,3139,3140],{"class":805,"line":846},[803,3141,3142],{"class":2066},"  \u002F** Request metadata *\u002F\n",[803,3144,3145,3148,3150],{"class":805,"line":864},[803,3146,3147],{"class":887},"  request",[803,3149,903],{"class":813},[803,3151,814],{"class":813},[803,3153,3154,3157,3159],{"class":805,"line":871},[803,3155,3156],{"class":887},"    method",[803,3158,891],{"class":813},[803,3160,894],{"class":878},[803,3162,3163,3166,3168],{"class":805,"line":884},[803,3164,3165],{"class":887},"    path",[803,3167,891],{"class":813},[803,3169,894],{"class":878},[803,3171,3172,3175,3177],{"class":805,"line":897},[803,3173,3174],{"class":887},"    requestId",[803,3176,891],{"class":813},[803,3178,894],{"class":878},[803,3180,3181],{"class":805,"line":908},[803,3182,2863],{"class":813},[803,3184,3185],{"class":805,"line":919},[803,3186,868],{"emptyLinePlaceholder":867},[803,3188,3189],{"class":805,"line":925},[803,3190,3191],{"class":2066},"  \u002F** Safe HTTP headers (sensitive headers filtered) *\u002F\n",[803,3193,3194,3197,3199,3202,3204,3207,3209,3211],{"class":805,"line":930},[803,3195,3196],{"class":887},"  headers",[803,3198,903],{"class":813},[803,3200,3201],{"class":878}," Record",[803,3203,943],{"class":813},[803,3205,3206],{"class":878},"string",[803,3208,979],{"class":813},[803,3210,1543],{"class":878},[803,3212,3213],{"class":813},">\n",[803,3215,3216],{"class":805,"line":961},[803,3217,922],{"class":813},[803,3219,3220],{"class":805,"line":1003},[803,3221,868],{"emptyLinePlaceholder":867},[803,3223,3224,3226,3229],{"class":805,"line":1037},[803,3225,875],{"class":874},[803,3227,3228],{"class":878}," WideEvent",[803,3230,814],{"class":813},[803,3232,3233,3236,3238],{"class":805,"line":1055},[803,3234,3235],{"class":887},"  timestamp",[803,3237,891],{"class":813},[803,3239,894],{"class":878},[803,3241,3242,3245,3247,3249,3252,3254,3257,3259,3262,3264,3266,3268,3271,3273,3275,3277,3279],{"class":805,"line":1061},[803,3243,3244],{"class":887},"  level",[803,3246,891],{"class":813},[803,3248,855],{"class":813},[803,3250,3251],{"class":858},"debug",[803,3253,976],{"class":813},[803,3255,3256],{"class":813}," |",[803,3258,855],{"class":813},[803,3260,3261],{"class":858},"info",[803,3263,976],{"class":813},[803,3265,3256],{"class":813},[803,3267,855],{"class":813},[803,3269,3270],{"class":858},"warn",[803,3272,976],{"class":813},[803,3274,3256],{"class":813},[803,3276,855],{"class":813},[803,3278,1233],{"class":858},[803,3280,861],{"class":813},[803,3282,3283,3285,3287],{"class":805,"line":1066},[803,3284,2263],{"class":887},[803,3286,891],{"class":813},[803,3288,894],{"class":878},[803,3290,3291,3294,3296],{"class":805,"line":1100},[803,3292,3293],{"class":887},"  environment",[803,3295,903],{"class":813},[803,3297,894],{"class":878},[803,3299,3300,3303,3305],{"class":805,"line":1120},[803,3301,3302],{"class":887},"  version",[803,3304,903],{"class":813},[803,3306,894],{"class":878},[803,3308,3309,3312,3314],{"class":805,"line":1137},[803,3310,3311],{"class":887},"  region",[803,3313,903],{"class":813},[803,3315,894],{"class":878},[803,3317,3318,3321,3323],{"class":805,"line":1156},[803,3319,3320],{"class":887},"  commitHash",[803,3322,903],{"class":813},[803,3324,894],{"class":878},[803,3326,3327,3330,3332],{"class":805,"line":1200},[803,3328,3329],{"class":887},"  requestId",[803,3331,903],{"class":813},[803,3333,894],{"class":878},[803,3335,3336],{"class":805,"line":1225},[803,3337,3338],{"class":2066},"  \u002F\u002F ... plus all fields added via log.set()\n",[803,3340,3341,3344,3347,3349,3351,3354,3356],{"class":805,"line":1247},[803,3342,3343],{"class":820},"  [",[803,3345,3346],{"class":1082},"key",[803,3348,891],{"class":813},[803,3350,1543],{"class":878},[803,3352,3353],{"class":820},"]",[803,3355,891],{"class":813},[803,3357,3358],{"class":878}," unknown\n",[803,3360,3361],{"class":805,"line":1256},[803,3362,922],{"class":813},[574,3364,3365,3366,3368,3369,3372,3373,3375,3376,3379],{},"In the batched form your ",[616,3367,787],{}," \u002F ",[616,3370,3371],{},"send()"," receives, you get ",[616,3374,2507],{}," directly (the toolkit unwraps ",[616,3377,3378],{},"event"," from each context).",[770,3381,3383],{"id":3382},"reach-for-a-toolkit-helper","Reach for a toolkit helper",[574,3385,3386,3388],{},[616,3387,646],{}," exposes the same helpers every built-in adapter uses. The ones relevant to drains:",[591,3390,3391,3401],{},[594,3392,3393],{},[597,3394,3395,3398],{},[600,3396,3397],{},"Export",[600,3399,3400],{},"Purpose",[607,3402,3403,3413,3423,3435,3445,3458,3468,3482],{},[597,3404,3405,3410],{},[612,3406,3407],{},[616,3408,3409],{},"defineHttpDrain(spec)",[612,3411,3412],{},"The HTTP recipe — auto retries, timeouts, identity headers, error isolation",[597,3414,3415,3420],{},[612,3416,3417],{},[616,3418,3419],{},"defineDrain(spec)",[612,3421,3422],{},"Same contract for non-HTTP transports",[597,3424,3425,3430],{},[612,3426,3427],{},[616,3428,3429],{},"resolveAdapterConfig(ns, fields, overrides)",[612,3431,3432,3433,700],{},"Standard config priority chain (overrides → ",[616,3434,699],{},[597,3436,3437,3442],{},[612,3438,3439],{},[616,3440,3441],{},"httpPost(opts)",[612,3443,3444],{},"The retried POST helper used by every built-in HTTP adapter — handles timeout, retries, redacted error messages",[597,3446,3447,3452],{},[612,3448,3449],{},[616,3450,3451],{},"composeDrains(drains)",[612,3453,3454,3455,1299],{},"Combine multiple drains into one (errors isolated, runs concurrently with ",[616,3456,3457],{},"Promise.allSettled",[597,3459,3460,3465],{},[612,3461,3462],{},[616,3463,3464],{},"toTypedAttributeValue(value)",[612,3466,3467],{},"Convert any value to the typed attribute shape used by Axiom \u002F Sentry",[597,3469,3470,3475],{},[612,3471,3472],{},[616,3473,3474],{},"toOtlpAttributeValue(value)",[612,3476,3477,3478,3481],{},"Convert any value to the OTLP ",[616,3479,3480],{},"AnyValue"," shape (used by OTLP \u002F HyperDX \u002F PostHog logs)",[597,3483,3484,3492],{},[612,3485,3486,715,3489],{},[616,3487,3488],{},"OTEL_SEVERITY_NUMBER",[616,3490,3491],{},"OTEL_SEVERITY_TEXT",[612,3493,3494],{},"OTEL log severity tables",[770,3496,3498],{"id":3497},"identify-your-traffic-to-the-receiver","Identify your traffic to the receiver",[574,3500,3501,3503],{},[616,3502,627],{}," automatically tags every request with two headers so receivers can identify the traffic:",[591,3505,3506,3516],{},[594,3507,3508],{},[597,3509,3510,3513],{},[600,3511,3512],{},"Header",[600,3514,3515],{},"Value",[607,3517,3518,3531],{},[597,3519,3520,3525],{},[612,3521,3522],{},[616,3523,3524],{},"User-Agent",[612,3526,3527,3530],{},[616,3528,3529],{},"evlog\u002F\u003Cversion>"," (Node \u002F server runtimes only — browsers strip this header)",[597,3532,3533,3538],{},[612,3534,3535],{},[616,3536,3537],{},"X-Evlog-Source",[612,3539,3540,3541,3544],{},"The drain ",[616,3542,3543],{},"name"," you provided",[574,3546,3547,3548,3551,3552,1215],{},"If you build a drain on top of ",[616,3549,3550],{},"httpPost"," directly, you can override or suppress them. See ",[583,3553,489],{"href":490},[770,3555,3557],{"id":3556},"errors-are-already-handled-for-you","Errors are already handled for you",[574,3559,3560,3562],{},[616,3561,627],{}," enforces every best practice automatically:",[1972,3564,3565,3575,3585,3593],{},[661,3566,3567,3570,3571,3574],{},[578,3568,3569],{},"Never throws",": failures are caught and logged with the ",[616,3572,3573],{},"[evlog\u002F\u003Cname>]"," prefix.",[661,3576,3577,3580,3581,3584],{},[578,3578,3579],{},"Retries",": defaults to 2 attempts on transient errors (configurable via ",[616,3582,3583],{},"retries",").",[661,3586,3587,3590,3591,3584],{},[578,3588,3589],{},"Timeouts",": defaults to 5000ms (configurable via ",[616,3592,718],{},[661,3594,3595,3598,3599,3601,3602,3604],{},[578,3596,3597],{},"Graceful degradation",": ",[616,3600,691],{}," returning ",[616,3603,732],{}," makes the drain a no-op.",[574,3606,3607,3608,3610],{},"If you fall back to ",[616,3609,640],{},", follow the same rules manually.",[770,3612,3614],{"id":3613},"publish-it-as-a-community-package","Publish it as a community package",[574,3616,3617],{},"Recommended structure for a community drain:",[793,3619,3624],{"className":3620,"code":3622,"language":3623,"meta":799},[3621],"language-text","my-evlog-drain\u002F\n├─ src\u002F\n│  ├─ drain.ts        # createMyDrain via defineHttpDrain\n│  └─ index.ts        # re-exports\n├─ test\u002F              # vitest, mock fetch\n├─ package.json       # peerDependency: \"evlog\"\n└─ README.md\n","text",[616,3625,3622],{"__ignoreMap":799},[574,3627,3628,3629,3631,3632,3635,3636,3639],{},"Add ",[616,3630,2333],{}," as a ",[616,3633,3634],{},"peerDependency"," (not a ",[616,3637,3638],{},"dependency","), so your package will not pull in a copy of evlog at install time.",[3641,3642,3645,3646,3651],"callout",{"color":3643,"icon":3644},"neutral","i-lucide-heart","Built something great? ",[583,3647,3650],{"href":3648,"rel":3649},"https:\u002F\u002Fgithub.com\u002Fevloghq\u002Fevlog\u002Fpulls",[763],"Open a PR"," to add a row to the Adapters table. The community will thank you.",[770,3653,3655],{"id":3654},"next-steps","Next steps",[658,3657,3658,3664,3672,3678,3684],{},[661,3659,3660,3663],{},[583,3661,3662],{"href":500},"Drain Pipeline",": wrap your drain in batch + retry + fanout for production",[661,3665,3666,3669,3670],{},[583,3667,3668],{"href":148},"Adapters Overview",": see how the built-in adapters use ",[616,3671,627],{},[661,3673,3674,3677],{},[583,3675,3676],{"href":482},"Custom Enrichers",": same toolkit shape for derived event fields",[661,3679,3680,3683],{},[583,3681,3682],{"href":460},"Custom Framework Integration",": same toolkit shape for HTTP frameworks",[661,3685,3686,3688],{},[583,3687,525],{"href":526},": security and production tips",[3690,3691,3692],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}",{"title":799,"searchDepth":817,"depth":817,"links":3694},[3695,3699,3700,3701,3702,3704,3705,3706,3707,3708,3709],{"id":772,"depth":817,"text":3696,"children":3697},"defineHttpDrain (the HTTP recipe)",[3698],{"id":1482,"depth":827,"text":1483},{"id":1964,"depth":817,"text":1965},{"id":2044,"depth":817,"text":2045},{"id":2498,"depth":817,"text":2499},{"id":2870,"depth":817,"text":3703},"defineDrain (non-HTTP transports)",{"id":3092,"depth":817,"text":3093},{"id":3382,"depth":817,"text":3383},{"id":3497,"depth":817,"text":3498},{"id":3556,"depth":817,"text":3557},{"id":3613,"depth":817,"text":3614},{"id":3654,"depth":817,"text":3655},"Build a drain for any backend without a built-in adapter. Config resolution, retries, timeouts, and identity headers are handled for you.","md",[3713,3715,3717],{"label":3662,"icon":502,"to":500,"color":3643,"variant":3714},"subtle",{"label":3668,"icon":3716,"to":148,"color":3643,"variant":3714},"i-custom-plug",{"label":525,"icon":383,"to":526,"color":3643,"variant":3714},{},{"title":494,"icon":497},{"title":569,"description":3710},"XGMOW-7l8wIirfkZ15TEiwYBU1P1QsYImUOpKVss9RU",[3723,3725],{"title":489,"path":490,"stem":491,"description":3724,"icon":492,"children":-1},"Every drain request carries User-Agent and X-Evlog-Source so receivers can triage the traffic. Override or suppress them when you need to.",{"title":499,"path":500,"stem":501,"description":3726,"icon":502,"children":-1},"The pipeline wraps every drain: it batches events, retries on failure, fans out to several destinations, and ships browser logs.",1788921652869]