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",[596,605,606],{},"createLogger()",", then call ",[596,609,610],{},"log.emit()"," when work finishes.",[613,614,617,620,639],"prompt",{":actions":615,"description":616,"icon":317},"[\"copy\",\"cursor\",\"claude\"]","Set up evlog in my AWS Lambda function",[582,618,619],{},"Set up evlog in an AWS Lambda function (e.g. SQS consumer).",[621,622,623,627,630,633,636],"ul",{},[624,625,626],"li",{},"Install evlog: pnpm add evlog",[624,628,629],{},"Call initLogger({ env: { service: 'my-fn' } }) once at module load (cold start)",[624,631,632],{},"In the handler, create a new createLogger({ messageId, ... }) per invocation or per message",[624,634,635],{},"Use log.set() to accumulate context; call log.emit() when done",[624,637,638],{},"Avoid a single module-level logger instance reused across invocations (Lambda reuses runtimes)",[582,640,641,642,647,648],{},"Docs: ",[591,643,644],{"href":644,"rel":645},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fframeworks\u002Faws-lambda",[646],"nofollow","\nAdapters: ",[591,649,650],{"href":650,"rel":651},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Foverview",[646],[653,654,656,657,660],"h2",{"id":655},"why-not-one-global-createlogger","Why not one global ",[596,658,659],{},"createLogger","?",[582,662,663,664,667,668,671],{},"Lambda ",[586,665,666],{},"execution environments are reused",": the same process can handle many invocations in sequence. Module-level variables persist, so ",[586,669,670],{},"one shared logger instance"," can leak fields from a previous invocation into the next.",[582,673,674,677,678,680,681,686],{},[586,675,676],{},"Do this:"," ",[596,679,598],{}," once at the top level (configuration only), and ",[586,682,683,685],{},[596,684,606],{}," inside the handler"," (or inside the loop over SQS records) for each unit of work.",[582,688,689,692,693,696,697,700],{},[586,690,691],{},"Dependency injection"," (passing ",[596,694,695],{},"log"," into functions) is optional, it helps tests and clarity, but what matters is ",[586,698,699],{},"one logger per invocation",", not whether you use DI.",[653,702,25],{"id":703},"quick-start",[705,706,708],"h3",{"id":707},"_1-install","1. Install",[710,711,712,737,751,765],"code-group",{},[713,714,720],"pre",{"className":715,"code":716,"filename":717,"language":718,"meta":719,"style":719},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog\n","pnpm","bash","",[596,721,722],{"__ignoreMap":719},[723,724,727,730,734],"span",{"class":725,"line":726},"line",1,[723,728,717],{"class":729},"sBMFI",[723,731,733],{"class":732},"sfazB"," add",[723,735,736],{"class":732}," evlog\n",[713,738,741],{"className":715,"code":739,"filename":740,"language":718,"meta":719,"style":719},"bun add evlog\n","bun",[596,742,743],{"__ignoreMap":719},[723,744,745,747,749],{"class":725,"line":726},[723,746,740],{"class":729},[723,748,733],{"class":732},[723,750,736],{"class":732},[713,752,755],{"className":715,"code":753,"filename":754,"language":718,"meta":719,"style":719},"yarn add evlog\n","yarn",[596,756,757],{"__ignoreMap":719},[723,758,759,761,763],{"class":725,"line":726},[723,760,754],{"class":729},[723,762,733],{"class":732},[723,764,736],{"class":732},[713,766,769],{"className":715,"code":767,"filename":768,"language":718,"meta":719,"style":719},"npm install evlog\n","npm",[596,770,771],{"__ignoreMap":719},[723,772,773,775,778],{"class":725,"line":726},[723,774,768],{"class":729},[723,776,777],{"class":732}," install",[723,779,736],{"class":732},[705,781,783],{"id":782},"_2-initialize-once-log-per-invocation","2. Initialize once, log per invocation",[713,785,790],{"className":786,"code":787,"filename":788,"language":789,"meta":719,"style":719},"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",[596,791,792,824,851,858,871,920,929,934,966,997,1015,1033,1056,1064,1069,1077,1118,1125,1154,1171,1216,1243,1252,1262,1275,1281,1287],{"__ignoreMap":719},[723,793,794,798,801,805,809,812,815,818,821],{"class":725,"line":726},[723,795,797],{"class":796},"s7zQu","import",[723,799,800],{"class":796}," type",[723,802,804],{"class":803},"sMK4o"," {",[723,806,808],{"class":807},"sTEyZ"," SQSEvent",[723,810,811],{"class":803}," }",[723,813,814],{"class":796}," from",[723,816,817],{"class":803}," '",[723,819,820],{"class":732},"aws-lambda",[723,822,823],{"class":803},"'\n",[723,825,827,829,831,834,837,840,842,844,846,849],{"class":725,"line":826},2,[723,828,797],{"class":796},[723,830,804],{"class":803},[723,832,833],{"class":807}," initLogger",[723,835,836],{"class":803},",",[723,838,839],{"class":807}," createLogger",[723,841,811],{"class":803},[723,843,814],{"class":796},[723,845,817],{"class":803},[723,847,848],{"class":732},"evlog",[723,850,823],{"class":803},[723,852,854],{"class":725,"line":853},3,[723,855,857],{"emptyLinePlaceholder":856},true,"\n",[723,859,861,865,868],{"class":725,"line":860},4,[723,862,864],{"class":863},"s2Zo4","initLogger",[723,866,867],{"class":807},"(",[723,869,870],{"class":803},"{\n",[723,872,874,878,881,883,886,888,890,893,896,898,901,903,906,909,912,914,917],{"class":725,"line":873},5,[723,875,877],{"class":876},"swJcz","  env",[723,879,880],{"class":803},":",[723,882,804],{"class":803},[723,884,885],{"class":876}," service",[723,887,880],{"class":803},[723,889,817],{"class":803},[723,891,892],{"class":732},"sqs-consumer",[723,894,895],{"class":803},"'",[723,897,836],{"class":803},[723,899,900],{"class":876}," environment",[723,902,880],{"class":803},[723,904,905],{"class":807}," process",[723,907,908],{"class":803},".",[723,910,911],{"class":807},"env",[723,913,908],{"class":803},[723,915,916],{"class":807},"NODE_ENV ",[723,918,919],{"class":803},"},\n",[723,921,923,926],{"class":725,"line":922},6,[723,924,925],{"class":803},"}",[723,927,928],{"class":807},")\n",[723,930,932],{"class":725,"line":931},7,[723,933,857],{"emptyLinePlaceholder":856},[723,935,937,940,944,947,950,952,956,958,960,963],{"class":725,"line":936},8,[723,938,939],{"class":796},"export",[723,941,943],{"class":942},"spNyl"," async",[723,945,946],{"class":942}," function",[723,948,949],{"class":863}," handler",[723,951,867],{"class":803},[723,953,955],{"class":954},"sHdIc","event",[723,957,880],{"class":803},[723,959,808],{"class":729},[723,961,962],{"class":803},")",[723,964,965],{"class":803}," {\n",[723,967,969,972,975,978,981,984,987,989,992,995],{"class":725,"line":968},9,[723,970,971],{"class":796},"  for",[723,973,974],{"class":876}," (",[723,976,977],{"class":942},"const",[723,979,980],{"class":807}," record",[723,982,983],{"class":803}," of",[723,985,986],{"class":807}," event",[723,988,908],{"class":803},[723,990,991],{"class":807},"Records",[723,993,994],{"class":876},") ",[723,996,870],{"class":803},[723,998,1000,1003,1006,1009,1011,1013],{"class":725,"line":999},10,[723,1001,1002],{"class":942},"    const",[723,1004,1005],{"class":807}," log",[723,1007,1008],{"class":803}," =",[723,1010,839],{"class":863},[723,1012,867],{"class":876},[723,1014,870],{"class":803},[723,1016,1018,1021,1023,1025,1027,1030],{"class":725,"line":1017},11,[723,1019,1020],{"class":876},"      messageId",[723,1022,880],{"class":803},[723,1024,980],{"class":807},[723,1026,908],{"class":803},[723,1028,1029],{"class":807},"messageId",[723,1031,1032],{"class":803},",\n",[723,1034,1036,1039,1041,1043,1045,1048,1051,1054],{"class":725,"line":1035},12,[723,1037,1038],{"class":876},"      approximateReceiveCount",[723,1040,880],{"class":803},[723,1042,980],{"class":807},[723,1044,908],{"class":803},[723,1046,1047],{"class":807},"attributes",[723,1049,1050],{"class":803},"?.",[723,1052,1053],{"class":807},"ApproximateReceiveCount",[723,1055,1032],{"class":803},[723,1057,1059,1062],{"class":725,"line":1058},13,[723,1060,1061],{"class":803},"    }",[723,1063,928],{"class":876},[723,1065,1067],{"class":725,"line":1066},14,[723,1068,857],{"emptyLinePlaceholder":856},[723,1070,1072,1075],{"class":725,"line":1071},15,[723,1073,1074],{"class":796},"    try",[723,1076,965],{"class":803},[723,1078,1080,1083,1085,1088,1090,1093,1096,1098,1100,1103,1105,1107,1109,1112,1114,1116],{"class":725,"line":1079},16,[723,1081,1082],{"class":807},"      log",[723,1084,908],{"class":803},[723,1086,1087],{"class":863},"set",[723,1089,867],{"class":876},[723,1091,1092],{"class":803},"{",[723,1094,1095],{"class":876}," queue",[723,1097,880],{"class":803},[723,1099,804],{"class":803},[723,1101,1102],{"class":876}," name",[723,1104,880],{"class":803},[723,1106,980],{"class":807},[723,1108,908],{"class":803},[723,1110,1111],{"class":807},"eventSourceARN",[723,1113,811],{"class":803},[723,1115,811],{"class":803},[723,1117,928],{"class":876},[723,1119,1121],{"class":725,"line":1120},17,[723,1122,1124],{"class":1123},"sHwdD","      \u002F\u002F … parse record.body and process the message\n",[723,1126,1128,1130,1132,1134,1136,1138,1141,1143,1145,1148,1150,1152],{"class":725,"line":1127},18,[723,1129,1082],{"class":807},[723,1131,908],{"class":803},[723,1133,1087],{"class":863},[723,1135,867],{"class":876},[723,1137,1092],{"class":803},[723,1139,1140],{"class":876}," status",[723,1142,880],{"class":803},[723,1144,817],{"class":803},[723,1146,1147],{"class":732},"ok",[723,1149,895],{"class":803},[723,1151,811],{"class":803},[723,1153,928],{"class":876},[723,1155,1157,1159,1162,1164,1167,1169],{"class":725,"line":1156},19,[723,1158,1061],{"class":803},[723,1160,1161],{"class":796}," catch",[723,1163,974],{"class":876},[723,1165,1166],{"class":807},"error",[723,1168,994],{"class":876},[723,1170,870],{"class":803},[723,1172,1174,1176,1178,1180,1182,1184,1187,1190,1193,1196,1199,1202,1204,1206,1209,1211,1213],{"class":725,"line":1173},20,[723,1175,1082],{"class":807},[723,1177,908],{"class":803},[723,1179,1166],{"class":863},[723,1181,867],{"class":876},[723,1183,1166],{"class":807},[723,1185,1186],{"class":803}," instanceof",[723,1188,1189],{"class":729}," Error",[723,1191,1192],{"class":803}," ?",[723,1194,1195],{"class":807}," error",[723,1197,1198],{"class":803}," :",[723,1200,1201],{"class":803}," new",[723,1203,1189],{"class":863},[723,1205,867],{"class":876},[723,1207,1208],{"class":863},"String",[723,1210,867],{"class":876},[723,1212,1166],{"class":807},[723,1214,1215],{"class":876},")))\n",[723,1217,1219,1221,1223,1225,1227,1229,1231,1233,1235,1237,1239,1241],{"class":725,"line":1218},21,[723,1220,1082],{"class":807},[723,1222,908],{"class":803},[723,1224,1087],{"class":863},[723,1226,867],{"class":876},[723,1228,1092],{"class":803},[723,1230,1140],{"class":876},[723,1232,880],{"class":803},[723,1234,817],{"class":803},[723,1236,1166],{"class":732},[723,1238,895],{"class":803},[723,1240,811],{"class":803},[723,1242,928],{"class":876},[723,1244,1246,1249],{"class":725,"line":1245},22,[723,1247,1248],{"class":796},"      throw",[723,1250,1251],{"class":807}," error\n",[723,1253,1255,1257,1260],{"class":725,"line":1254},23,[723,1256,1061],{"class":803},[723,1258,1259],{"class":796}," finally",[723,1261,965],{"class":803},[723,1263,1265,1267,1269,1272],{"class":725,"line":1264},24,[723,1266,1082],{"class":807},[723,1268,908],{"class":803},[723,1270,1271],{"class":863},"emit",[723,1273,1274],{"class":876},"()\n",[723,1276,1278],{"class":725,"line":1277},25,[723,1279,1280],{"class":803},"    }\n",[723,1282,1284],{"class":725,"line":1283},26,[723,1285,1286],{"class":803},"  }\n",[723,1288,1290],{"class":725,"line":1289},27,[723,1291,1292],{"class":803},"}\n",[582,1294,1295,1296,677,1299,1301],{},"If you process the whole batch as one logical unit, use a ",[586,1297,1298],{},"single",[596,1300,606],{}," per handler invocation with batch metadata instead of one logger per record.",[653,1303,1305,1306],{"id":1304},"stdout-and-silent","Stdout and ",[596,1307,1308],{},"silent",[582,1310,1311,1312,1315,1316,1319,1320,1323,1324,908],{},"Many teams ingest Lambda logs from ",[586,1313,1314],{},"CloudWatch"," via stdout. If you use a ",[586,1317,1318],{},"drain adapter"," (OTLP, Datadog, Axiom, etc.) and want JSON or platform-specific formatting without duplicate console noise, set ",[596,1321,1322],{},"silent: true"," in production. See ",[591,1325,521],{"href":1326},"\u002Freference\u002Fconfiguration#silence-the-terminal",[713,1328,1330],{"className":786,"code":1329,"filename":788,"language":789,"meta":719,"style":719},"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",[596,1331,1332,1352,1370,1374,1382,1403,1432,1446],{"__ignoreMap":719},[723,1333,1334,1336,1338,1341,1343,1345,1347,1350],{"class":725,"line":726},[723,1335,797],{"class":796},[723,1337,804],{"class":803},[723,1339,1340],{"class":807}," createAxiomDrain",[723,1342,811],{"class":803},[723,1344,814],{"class":796},[723,1346,817],{"class":803},[723,1348,1349],{"class":732},"evlog\u002Faxiom",[723,1351,823],{"class":803},[723,1353,1354,1356,1358,1360,1362,1364,1366,1368],{"class":725,"line":826},[723,1355,797],{"class":796},[723,1357,804],{"class":803},[723,1359,833],{"class":807},[723,1361,811],{"class":803},[723,1363,814],{"class":796},[723,1365,817],{"class":803},[723,1367,848],{"class":732},[723,1369,823],{"class":803},[723,1371,1372],{"class":725,"line":853},[723,1373,857],{"emptyLinePlaceholder":856},[723,1375,1376,1378,1380],{"class":725,"line":860},[723,1377,864],{"class":863},[723,1379,867],{"class":807},[723,1381,870],{"class":803},[723,1383,1384,1386,1388,1390,1392,1394,1396,1398,1400],{"class":725,"line":873},[723,1385,877],{"class":876},[723,1387,880],{"class":803},[723,1389,804],{"class":803},[723,1391,885],{"class":876},[723,1393,880],{"class":803},[723,1395,817],{"class":803},[723,1397,892],{"class":732},[723,1399,895],{"class":803},[723,1401,1402],{"class":803}," },\n",[723,1404,1405,1408,1410,1412,1414,1416,1418,1420,1423,1425,1428,1430],{"class":725,"line":922},[723,1406,1407],{"class":876},"  silent",[723,1409,880],{"class":803},[723,1411,905],{"class":807},[723,1413,908],{"class":803},[723,1415,911],{"class":807},[723,1417,908],{"class":803},[723,1419,916],{"class":807},[723,1421,1422],{"class":803},"===",[723,1424,817],{"class":803},[723,1426,1427],{"class":732},"production",[723,1429,895],{"class":803},[723,1431,1032],{"class":803},[723,1433,1434,1437,1439,1441,1444],{"class":725,"line":931},[723,1435,1436],{"class":876},"  drain",[723,1438,880],{"class":803},[723,1440,1340],{"class":863},[723,1442,1443],{"class":807},"()",[723,1445,1032],{"class":803},[723,1447,1448,1450],{"class":725,"line":936},[723,1449,925],{"class":803},[723,1451,928],{"class":807},[1453,1454,1457,1458,1460,1461,1464],"callout",{"color":1455,"icon":1456},"warning","i-lucide-alert-triangle","If ",[596,1459,1308],{}," is enabled without a ",[596,1462,1463],{},"drain",", events may not be visible anywhere. See the configuration docs for details.",[653,1466,1468],{"id":1467},"error-handling","Error handling",[582,1470,1471,1472,1475,1476,1479,1480,1479,1483,1486],{},"Use ",[596,1473,1474],{},"createError"," where you want structured fields (",[596,1477,1478],{},"why",", ",[596,1481,1482],{},"fix",[596,1484,1485],{},"link","). Map failures to your Lambda return or rethrow so SQS retry\u002FDLQ behavior stays correct. evlog does not replace AWS error semantics.",[713,1488,1490],{"className":786,"code":1489,"filename":788,"language":789,"meta":719,"style":719},"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",[596,1491,1492,1511,1515,1526,1542,1555,1571,1587],{"__ignoreMap":719},[723,1493,1494,1496,1498,1501,1503,1505,1507,1509],{"class":725,"line":726},[723,1495,797],{"class":796},[723,1497,804],{"class":803},[723,1499,1500],{"class":807}," 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