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",[601,602,603],"code",{},"initLogger()"," once, create a logger ",[591,606,607],{},"per invocation"," (or per SQS message) with ",[601,610,611],{},"createLogger()",", then call ",[601,614,615],{},"log.emit()"," when work finishes.",[618,619,622,625,644],"prompt",{":actions":620,"description":621,"icon":317},"[\"copy\",\"cursor\",\"claude\"]","Set up evlog in my AWS Lambda function",[587,623,624],{},"Set up evlog in an AWS Lambda function (e.g. SQS consumer).",[626,627,628,632,635,638,641],"ul",{},[629,630,631],"li",{},"Install evlog: pnpm add evlog",[629,633,634],{},"Call initLogger({ env: { service: 'my-fn' } }) once at module load (cold start)",[629,636,637],{},"In the handler, create a new createLogger({ messageId, ... }) per invocation or per message",[629,639,640],{},"Use log.set() to accumulate context; call log.emit() when done",[629,642,643],{},"Avoid a single module-level logger instance reused across invocations (Lambda reuses runtimes)",[587,645,646,647,652,653],{},"Docs: ",[596,648,649],{"href":649,"rel":650},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fframeworks\u002Faws-lambda",[651],"nofollow","\nAdapters: ",[596,654,655],{"href":655,"rel":656},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Foverview",[651],[658,659,661,662,665],"h2",{"id":660},"why-not-one-global-createlogger","Why not one global ",[601,663,664],{},"createLogger","?",[587,667,668,669,672,673,676],{},"Lambda ",[591,670,671],{},"execution environments are reused",": the same process can handle many invocations in sequence. Module-level variables persist, so ",[591,674,675],{},"one shared logger instance"," can leak fields from a previous invocation into the next.",[587,678,679,682,683,685,686,691],{},[591,680,681],{},"Do this:"," ",[601,684,603],{}," once at the top level (configuration only), and ",[591,687,688,690],{},[601,689,611],{}," inside the handler"," (or inside the loop over SQS records) for each unit of work.",[587,693,694,697,698,701,702,705],{},[591,695,696],{},"Dependency injection"," (passing ",[601,699,700],{},"log"," into functions) is optional, it helps tests and clarity, but what matters is ",[591,703,704],{},"one logger per invocation",", not whether you use DI.",[658,707,25],{"id":708},"quick-start",[710,711,713],"h3",{"id":712},"_1-install","1. Install",[715,716,717,742,756,770],"code-group",{},[718,719,725],"pre",{"className":720,"code":721,"filename":722,"language":723,"meta":724,"style":724},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog\n","pnpm","bash","",[601,726,727],{"__ignoreMap":724},[728,729,732,735,739],"span",{"class":730,"line":731},"line",1,[728,733,722],{"class":734},"sBMFI",[728,736,738],{"class":737},"sfazB"," add",[728,740,741],{"class":737}," evlog\n",[718,743,746],{"className":720,"code":744,"filename":745,"language":723,"meta":724,"style":724},"bun add evlog\n","bun",[601,747,748],{"__ignoreMap":724},[728,749,750,752,754],{"class":730,"line":731},[728,751,745],{"class":734},[728,753,738],{"class":737},[728,755,741],{"class":737},[718,757,760],{"className":720,"code":758,"filename":759,"language":723,"meta":724,"style":724},"yarn add evlog\n","yarn",[601,761,762],{"__ignoreMap":724},[728,763,764,766,768],{"class":730,"line":731},[728,765,759],{"class":734},[728,767,738],{"class":737},[728,769,741],{"class":737},[718,771,774],{"className":720,"code":772,"filename":773,"language":723,"meta":724,"style":724},"npm install evlog\n","npm",[601,775,776],{"__ignoreMap":724},[728,777,778,780,783],{"class":730,"line":731},[728,779,773],{"class":734},[728,781,782],{"class":737}," install",[728,784,741],{"class":737},[710,786,788],{"id":787},"_2-initialize-once-log-per-invocation","2. Initialize once, log per invocation",[718,790,795],{"className":791,"code":792,"filename":793,"language":794,"meta":724,"style":724},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import type { SQSEvent } from 'aws-lambda'\nimport { initLogger, createLogger } from 'evlog'\n\ninitLogger({\n  env: { service: 'sqs-consumer', environment: process.env.NODE_ENV },\n})\n\nexport async function handler(event: SQSEvent) {\n  for (const record of event.Records) {\n    const log = createLogger({\n      messageId: record.messageId,\n      approximateReceiveCount: record.attributes?.ApproximateReceiveCount,\n    })\n\n    try {\n      log.set({ queue: { name: record.eventSourceARN } })\n      \u002F\u002F … parse record.body and process the message\n      log.set({ status: 'ok' })\n    } catch (error) {\n      log.error(error instanceof Error ? error : new Error(String(error)))\n      log.set({ status: 'error' })\n      throw error\n    } finally {\n      log.emit()\n    }\n  }\n}\n","src\u002Fhandler.ts","typescript",[601,796,797,829,856,863,876,925,934,939,971,1002,1020,1038,1061,1069,1074,1082,1123,1130,1159,1176,1221,1248,1257,1267,1280,1286,1292],{"__ignoreMap":724},[728,798,799,803,806,810,814,817,820,823,826],{"class":730,"line":731},[728,800,802],{"class":801},"s7zQu","import",[728,804,805],{"class":801}," type",[728,807,809],{"class":808},"sMK4o"," {",[728,811,813],{"class":812},"sTEyZ"," SQSEvent",[728,815,816],{"class":808}," }",[728,818,819],{"class":801}," from",[728,821,822],{"class":808}," '",[728,824,825],{"class":737},"aws-lambda",[728,827,828],{"class":808},"'\n",[728,830,832,834,836,839,842,845,847,849,851,854],{"class":730,"line":831},2,[728,833,802],{"class":801},[728,835,809],{"class":808},[728,837,838],{"class":812}," initLogger",[728,840,841],{"class":808},",",[728,843,844],{"class":812}," createLogger",[728,846,816],{"class":808},[728,848,819],{"class":801},[728,850,822],{"class":808},[728,852,853],{"class":737},"evlog",[728,855,828],{"class":808},[728,857,859],{"class":730,"line":858},3,[728,860,862],{"emptyLinePlaceholder":861},true,"\n",[728,864,866,870,873],{"class":730,"line":865},4,[728,867,869],{"class":868},"s2Zo4","initLogger",[728,871,872],{"class":812},"(",[728,874,875],{"class":808},"{\n",[728,877,879,883,886,888,891,893,895,898,901,903,906,908,911,914,917,919,922],{"class":730,"line":878},5,[728,880,882],{"class":881},"swJcz","  env",[728,884,885],{"class":808},":",[728,887,809],{"class":808},[728,889,890],{"class":881}," service",[728,892,885],{"class":808},[728,894,822],{"class":808},[728,896,897],{"class":737},"sqs-consumer",[728,899,900],{"class":808},"'",[728,902,841],{"class":808},[728,904,905],{"class":881}," environment",[728,907,885],{"class":808},[728,909,910],{"class":812}," process",[728,912,913],{"class":808},".",[728,915,916],{"class":812},"env",[728,918,913],{"class":808},[728,920,921],{"class":812},"NODE_ENV ",[728,923,924],{"class":808},"},\n",[728,926,928,931],{"class":730,"line":927},6,[728,929,930],{"class":808},"}",[728,932,933],{"class":812},")\n",[728,935,937],{"class":730,"line":936},7,[728,938,862],{"emptyLinePlaceholder":861},[728,940,942,945,949,952,955,957,961,963,965,968],{"class":730,"line":941},8,[728,943,944],{"class":801},"export",[728,946,948],{"class":947},"spNyl"," async",[728,950,951],{"class":947}," function",[728,953,954],{"class":868}," handler",[728,956,872],{"class":808},[728,958,960],{"class":959},"sHdIc","event",[728,962,885],{"class":808},[728,964,813],{"class":734},[728,966,967],{"class":808},")",[728,969,970],{"class":808}," {\n",[728,972,974,977,980,983,986,989,992,994,997,1000],{"class":730,"line":973},9,[728,975,976],{"class":801},"  for",[728,978,979],{"class":881}," (",[728,981,982],{"class":947},"const",[728,984,985],{"class":812}," record",[728,987,988],{"class":808}," of",[728,990,991],{"class":812}," event",[728,993,913],{"class":808},[728,995,996],{"class":812},"Records",[728,998,999],{"class":881},") ",[728,1001,875],{"class":808},[728,1003,1005,1008,1011,1014,1016,1018],{"class":730,"line":1004},10,[728,1006,1007],{"class":947},"    const",[728,1009,1010],{"class":812}," log",[728,1012,1013],{"class":808}," =",[728,1015,844],{"class":868},[728,1017,872],{"class":881},[728,1019,875],{"class":808},[728,1021,1023,1026,1028,1030,1032,1035],{"class":730,"line":1022},11,[728,1024,1025],{"class":881},"      messageId",[728,1027,885],{"class":808},[728,1029,985],{"class":812},[728,1031,913],{"class":808},[728,1033,1034],{"class":812},"messageId",[728,1036,1037],{"class":808},",\n",[728,1039,1041,1044,1046,1048,1050,1053,1056,1059],{"class":730,"line":1040},12,[728,1042,1043],{"class":881},"      approximateReceiveCount",[728,1045,885],{"class":808},[728,1047,985],{"class":812},[728,1049,913],{"class":808},[728,1051,1052],{"class":812},"attributes",[728,1054,1055],{"class":808},"?.",[728,1057,1058],{"class":812},"ApproximateReceiveCount",[728,1060,1037],{"class":808},[728,1062,1064,1067],{"class":730,"line":1063},13,[728,1065,1066],{"class":808},"    }",[728,1068,933],{"class":881},[728,1070,1072],{"class":730,"line":1071},14,[728,1073,862],{"emptyLinePlaceholder":861},[728,1075,1077,1080],{"class":730,"line":1076},15,[728,1078,1079],{"class":801},"    try",[728,1081,970],{"class":808},[728,1083,1085,1088,1090,1093,1095,1098,1101,1103,1105,1108,1110,1112,1114,1117,1119,1121],{"class":730,"line":1084},16,[728,1086,1087],{"class":812},"      log",[728,1089,913],{"class":808},[728,1091,1092],{"class":868},"set",[728,1094,872],{"class":881},[728,1096,1097],{"class":808},"{",[728,1099,1100],{"class":881}," queue",[728,1102,885],{"class":808},[728,1104,809],{"class":808},[728,1106,1107],{"class":881}," name",[728,1109,885],{"class":808},[728,1111,985],{"class":812},[728,1113,913],{"class":808},[728,1115,1116],{"class":812},"eventSourceARN",[728,1118,816],{"class":808},[728,1120,816],{"class":808},[728,1122,933],{"class":881},[728,1124,1126],{"class":730,"line":1125},17,[728,1127,1129],{"class":1128},"sHwdD","      \u002F\u002F … parse record.body and process the message\n",[728,1131,1133,1135,1137,1139,1141,1143,1146,1148,1150,1153,1155,1157],{"class":730,"line":1132},18,[728,1134,1087],{"class":812},[728,1136,913],{"class":808},[728,1138,1092],{"class":868},[728,1140,872],{"class":881},[728,1142,1097],{"class":808},[728,1144,1145],{"class":881}," status",[728,1147,885],{"class":808},[728,1149,822],{"class":808},[728,1151,1152],{"class":737},"ok",[728,1154,900],{"class":808},[728,1156,816],{"class":808},[728,1158,933],{"class":881},[728,1160,1162,1164,1167,1169,1172,1174],{"class":730,"line":1161},19,[728,1163,1066],{"class":808},[728,1165,1166],{"class":801}," catch",[728,1168,979],{"class":881},[728,1170,1171],{"class":812},"error",[728,1173,999],{"class":881},[728,1175,875],{"class":808},[728,1177,1179,1181,1183,1185,1187,1189,1192,1195,1198,1201,1204,1207,1209,1211,1214,1216,1218],{"class":730,"line":1178},20,[728,1180,1087],{"class":812},[728,1182,913],{"class":808},[728,1184,1171],{"class":868},[728,1186,872],{"class":881},[728,1188,1171],{"class":812},[728,1190,1191],{"class":808}," instanceof",[728,1193,1194],{"class":734}," Error",[728,1196,1197],{"class":808}," ?",[728,1199,1200],{"class":812}," error",[728,1202,1203],{"class":808}," :",[728,1205,1206],{"class":808}," new",[728,1208,1194],{"class":868},[728,1210,872],{"class":881},[728,1212,1213],{"class":868},"String",[728,1215,872],{"class":881},[728,1217,1171],{"class":812},[728,1219,1220],{"class":881},")))\n",[728,1222,1224,1226,1228,1230,1232,1234,1236,1238,1240,1242,1244,1246],{"class":730,"line":1223},21,[728,1225,1087],{"class":812},[728,1227,913],{"class":808},[728,1229,1092],{"class":868},[728,1231,872],{"class":881},[728,1233,1097],{"class":808},[728,1235,1145],{"class":881},[728,1237,885],{"class":808},[728,1239,822],{"class":808},[728,1241,1171],{"class":737},[728,1243,900],{"class":808},[728,1245,816],{"class":808},[728,1247,933],{"class":881},[728,1249,1251,1254],{"class":730,"line":1250},22,[728,1252,1253],{"class":801},"      throw",[728,1255,1256],{"class":812}," error\n",[728,1258,1260,1262,1265],{"class":730,"line":1259},23,[728,1261,1066],{"class":808},[728,1263,1264],{"class":801}," finally",[728,1266,970],{"class":808},[728,1268,1270,1272,1274,1277],{"class":730,"line":1269},24,[728,1271,1087],{"class":812},[728,1273,913],{"class":808},[728,1275,1276],{"class":868},"emit",[728,1278,1279],{"class":881},"()\n",[728,1281,1283],{"class":730,"line":1282},25,[728,1284,1285],{"class":808},"    }\n",[728,1287,1289],{"class":730,"line":1288},26,[728,1290,1291],{"class":808},"  }\n",[728,1293,1295],{"class":730,"line":1294},27,[728,1296,1297],{"class":808},"}\n",[587,1299,1300,1301,682,1304,1306],{},"If you process the whole batch as one logical unit, use a ",[591,1302,1303],{},"single",[601,1305,611],{}," per handler invocation with batch metadata instead of one logger per record.",[658,1308,1310,1311],{"id":1309},"stdout-and-silent","Stdout and ",[601,1312,1313],{},"silent",[587,1315,1316,1317,1320,1321,1324,1325,1328,1329,913],{},"Many teams ingest Lambda logs from ",[591,1318,1319],{},"CloudWatch"," via stdout. If you use a ",[591,1322,1323],{},"drain adapter"," (OTLP, Datadog, Axiom, etc.) and want JSON or platform-specific formatting without duplicate console noise, set ",[601,1326,1327],{},"silent: true"," in production. See ",[596,1330,526],{"href":1331},"\u002Freference\u002Fconfiguration#silence-the-terminal",[718,1333,1335],{"className":791,"code":1334,"filename":793,"language":794,"meta":724,"style":724},"import { createAxiomDrain } from 'evlog\u002Faxiom'\nimport { initLogger } from 'evlog'\n\ninitLogger({\n  env: { service: 'sqs-consumer' },\n  silent: process.env.NODE_ENV === 'production',\n  drain: createAxiomDrain(),\n})\n",[601,1336,1337,1357,1375,1379,1387,1408,1437,1451],{"__ignoreMap":724},[728,1338,1339,1341,1343,1346,1348,1350,1352,1355],{"class":730,"line":731},[728,1340,802],{"class":801},[728,1342,809],{"class":808},[728,1344,1345],{"class":812}," createAxiomDrain",[728,1347,816],{"class":808},[728,1349,819],{"class":801},[728,1351,822],{"class":808},[728,1353,1354],{"class":737},"evlog\u002Faxiom",[728,1356,828],{"class":808},[728,1358,1359,1361,1363,1365,1367,1369,1371,1373],{"class":730,"line":831},[728,1360,802],{"class":801},[728,1362,809],{"class":808},[728,1364,838],{"class":812},[728,1366,816],{"class":808},[728,1368,819],{"class":801},[728,1370,822],{"class":808},[728,1372,853],{"class":737},[728,1374,828],{"class":808},[728,1376,1377],{"class":730,"line":858},[728,1378,862],{"emptyLinePlaceholder":861},[728,1380,1381,1383,1385],{"class":730,"line":865},[728,1382,869],{"class":868},[728,1384,872],{"class":812},[728,1386,875],{"class":808},[728,1388,1389,1391,1393,1395,1397,1399,1401,1403,1405],{"class":730,"line":878},[728,1390,882],{"class":881},[728,1392,885],{"class":808},[728,1394,809],{"class":808},[728,1396,890],{"class":881},[728,1398,885],{"class":808},[728,1400,822],{"class":808},[728,1402,897],{"class":737},[728,1404,900],{"class":808},[728,1406,1407],{"class":808}," },\n",[728,1409,1410,1413,1415,1417,1419,1421,1423,1425,1428,1430,1433,1435],{"class":730,"line":927},[728,1411,1412],{"class":881},"  silent",[728,1414,885],{"class":808},[728,1416,910],{"class":812},[728,1418,913],{"class":808},[728,1420,916],{"class":812},[728,1422,913],{"class":808},[728,1424,921],{"class":812},[728,1426,1427],{"class":808},"===",[728,1429,822],{"class":808},[728,1431,1432],{"class":737},"production",[728,1434,900],{"class":808},[728,1436,1037],{"class":808},[728,1438,1439,1442,1444,1446,1449],{"class":730,"line":936},[728,1440,1441],{"class":881},"  drain",[728,1443,885],{"class":808},[728,1445,1345],{"class":868},[728,1447,1448],{"class":812},"()",[728,1450,1037],{"class":808},[728,1452,1453,1455],{"class":730,"line":941},[728,1454,930],{"class":808},[728,1456,933],{"class":812},[1458,1459,1462,1463,1465,1466,1469],"callout",{"color":1460,"icon":1461},"warning","i-lucide-alert-triangle","If ",[601,1464,1313],{}," is enabled without a ",[601,1467,1468],{},"drain",", events may not be visible anywhere. See the configuration docs for details.",[658,1471,1473],{"id":1472},"error-handling","Error handling",[587,1475,1476,1477,1480,1481,1484,1485,1484,1488,1491],{},"Use ",[601,1478,1479],{},"createError"," where you want structured fields (",[601,1482,1483],{},"why",", ",[601,1486,1487],{},"fix",[601,1489,1490],{},"link","). Map failures to your Lambda return or rethrow so SQS retry\u002FDLQ behavior stays correct. evlog does not replace AWS error semantics.",[718,1493,1495],{"className":791,"code":1494,"filename":793,"language":794,"meta":724,"style":724},"import { createError } from 'evlog'\n\nthrow createError({\n  message: 'Invalid payload',\n  status: 400,\n  why: 'Required field missing',\n  fix: 'Include orderId in the message body',\n})\n",[601,1496,1497,1516,1520,1531,1547,1560,1576,1592],{"__ignoreMap":724},[728,1498,1499,1501,1503,1506,1508,1510,1512,1514],{"class":730,"line":731},[728,1500,802],{"class":801},[728,1502,809],{"class":808},[728,1504,1505],{"class":812}," 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