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done",[615,628,629],{},"Avoid a single module-level logger instance reused across invocations (Lambda reuses runtimes)",[573,631,632,633,638,639],{},"Docs: ",[582,634,635],{"href":635,"rel":636},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fframeworks\u002Faws-lambda",[637],"nofollow","\nAdapters: ",[582,640,641],{"href":641,"rel":642},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Foverview",[637],[644,645,647,648,651],"h2",{"id":646},"why-not-one-global-createlogger","Why not one global ",[587,649,650],{},"createLogger","?",[573,653,654,655,658,659,662],{},"Lambda ",[577,656,657],{},"execution environments are reused",": the same process can handle many invocations in sequence. Module-level variables persist, so ",[577,660,661],{},"one shared logger instance"," can leak fields from a previous invocation into the next.",[573,664,665,668,669,671,672,677],{},[577,666,667],{},"Do this:"," ",[587,670,589],{}," once at the top level (configuration only), and ",[577,673,674,676],{},[587,675,597],{}," inside the handler"," (or inside the loop over SQS records) for each unit of work.",[573,679,680,683,684,687,688,691],{},[577,681,682],{},"Dependency injection"," (passing ",[587,685,686],{},"log"," into functions) is optional, it helps tests and clarity, but what matters is ",[577,689,690],{},"one logger per invocation",", not whether you use DI.",[644,693,25],{"id":694},"quick-start",[696,697,699],"h3",{"id":698},"_1-install","1. Install",[701,702,703,728,742,756],"code-group",{},[704,705,711],"pre",{"className":706,"code":707,"filename":708,"language":709,"meta":710,"style":710},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog\n","pnpm","bash","",[587,712,713],{"__ignoreMap":710},[714,715,718,721,725],"span",{"class":716,"line":717},"line",1,[714,719,708],{"class":720},"sBMFI",[714,722,724],{"class":723},"sfazB"," add",[714,726,727],{"class":723}," evlog\n",[704,729,732],{"className":706,"code":730,"filename":731,"language":709,"meta":710,"style":710},"bun add evlog\n","bun",[587,733,734],{"__ignoreMap":710},[714,735,736,738,740],{"class":716,"line":717},[714,737,731],{"class":720},[714,739,724],{"class":723},[714,741,727],{"class":723},[704,743,746],{"className":706,"code":744,"filename":745,"language":709,"meta":710,"style":710},"yarn add evlog\n","yarn",[587,747,748],{"__ignoreMap":710},[714,749,750,752,754],{"class":716,"line":717},[714,751,745],{"class":720},[714,753,724],{"class":723},[714,755,727],{"class":723},[704,757,760],{"className":706,"code":758,"filename":759,"language":709,"meta":710,"style":710},"npm install evlog\n","npm",[587,761,762],{"__ignoreMap":710},[714,763,764,766,769],{"class":716,"line":717},[714,765,759],{"class":720},[714,767,768],{"class":723}," install",[714,770,727],{"class":723},[696,772,774],{"id":773},"_2-initialize-once-log-per-invocation","2. Initialize once, log per invocation",[704,776,781],{"className":777,"code":778,"filename":779,"language":780,"meta":710,"style":710},"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",[587,782,783,815,842,849,862,911,920,925,957,988,1006,1024,1047,1055,1060,1068,1109,1116,1145,1162,1207,1234,1243,1253,1266,1272,1278],{"__ignoreMap":710},[714,784,785,789,792,796,800,803,806,809,812],{"class":716,"line":717},[714,786,788],{"class":787},"s7zQu","import",[714,790,791],{"class":787}," type",[714,793,795],{"class":794},"sMK4o"," {",[714,797,799],{"class":798},"sTEyZ"," SQSEvent",[714,801,802],{"class":794}," }",[714,804,805],{"class":787}," from",[714,807,808],{"class":794}," '",[714,810,811],{"class":723},"aws-lambda",[714,813,814],{"class":794},"'\n",[714,816,818,820,822,825,828,831,833,835,837,840],{"class":716,"line":817},2,[714,819,788],{"class":787},[714,821,795],{"class":794},[714,823,824],{"class":798}," initLogger",[714,826,827],{"class":794},",",[714,829,830],{"class":798}," createLogger",[714,832,802],{"class":794},[714,834,805],{"class":787},[714,836,808],{"class":794},[714,838,839],{"class":723},"evlog",[714,841,814],{"class":794},[714,843,845],{"class":716,"line":844},3,[714,846,848],{"emptyLinePlaceholder":847},true,"\n",[714,850,852,856,859],{"class":716,"line":851},4,[714,853,855],{"class":854},"s2Zo4","initLogger",[714,857,858],{"class":798},"(",[714,860,861],{"class":794},"{\n",[714,863,865,869,872,874,877,879,881,884,887,889,892,894,897,900,903,905,908],{"class":716,"line":864},5,[714,866,868],{"class":867},"swJcz","  env",[714,870,871],{"class":794},":",[714,873,795],{"class":794},[714,875,876],{"class":867}," service",[714,878,871],{"class":794},[714,880,808],{"class":794},[714,882,883],{"class":723},"sqs-consumer",[714,885,886],{"class":794},"'",[714,888,827],{"class":794},[714,890,891],{"class":867}," environment",[714,893,871],{"class":794},[714,895,896],{"class":798}," process",[714,898,899],{"class":794},".",[714,901,902],{"class":798},"env",[714,904,899],{"class":794},[714,906,907],{"class":798},"NODE_ENV ",[714,909,910],{"class":794},"},\n",[714,912,914,917],{"class":716,"line":913},6,[714,915,916],{"class":794},"}",[714,918,919],{"class":798},")\n",[714,921,923],{"class":716,"line":922},7,[714,924,848],{"emptyLinePlaceholder":847},[714,926,928,931,935,938,941,943,947,949,951,954],{"class":716,"line":927},8,[714,929,930],{"class":787},"export",[714,932,934],{"class":933},"spNyl"," async",[714,936,937],{"class":933}," function",[714,939,940],{"class":854}," handler",[714,942,858],{"class":794},[714,944,946],{"class":945},"sHdIc","event",[714,948,871],{"class":794},[714,950,799],{"class":720},[714,952,953],{"class":794},")",[714,955,956],{"class":794}," {\n",[714,958,960,963,966,969,972,975,978,980,983,986],{"class":716,"line":959},9,[714,961,962],{"class":787},"  for",[714,964,965],{"class":867}," (",[714,967,968],{"class":933},"const",[714,970,971],{"class":798}," record",[714,973,974],{"class":794}," of",[714,976,977],{"class":798}," event",[714,979,899],{"class":794},[714,981,982],{"class":798},"Records",[714,984,985],{"class":867},") ",[714,987,861],{"class":794},[714,989,991,994,997,1000,1002,1004],{"class":716,"line":990},10,[714,992,993],{"class":933},"    const",[714,995,996],{"class":798}," log",[714,998,999],{"class":794}," =",[714,1001,830],{"class":854},[714,1003,858],{"class":867},[714,1005,861],{"class":794},[714,1007,1009,1012,1014,1016,1018,1021],{"class":716,"line":1008},11,[714,1010,1011],{"class":867},"      messageId",[714,1013,871],{"class":794},[714,1015,971],{"class":798},[714,1017,899],{"class":794},[714,1019,1020],{"class":798},"messageId",[714,1022,1023],{"class":794},",\n",[714,1025,1027,1030,1032,1034,1036,1039,1042,1045],{"class":716,"line":1026},12,[714,1028,1029],{"class":867},"      approximateReceiveCount",[714,1031,871],{"class":794},[714,1033,971],{"class":798},[714,1035,899],{"class":794},[714,1037,1038],{"class":798},"attributes",[714,1040,1041],{"class":794},"?.",[714,1043,1044],{"class":798},"ApproximateReceiveCount",[714,1046,1023],{"class":794},[714,1048,1050,1053],{"class":716,"line":1049},13,[714,1051,1052],{"class":794},"    }",[714,1054,919],{"class":867},[714,1056,1058],{"class":716,"line":1057},14,[714,1059,848],{"emptyLinePlaceholder":847},[714,1061,1063,1066],{"class":716,"line":1062},15,[714,1064,1065],{"class":787},"    try",[714,1067,956],{"class":794},[714,1069,1071,1074,1076,1079,1081,1084,1087,1089,1091,1094,1096,1098,1100,1103,1105,1107],{"class":716,"line":1070},16,[714,1072,1073],{"class":798},"      log",[714,1075,899],{"class":794},[714,1077,1078],{"class":854},"set",[714,1080,858],{"class":867},[714,1082,1083],{"class":794},"{",[714,1085,1086],{"class":867}," queue",[714,1088,871],{"class":794},[714,1090,795],{"class":794},[714,1092,1093],{"class":867}," name",[714,1095,871],{"class":794},[714,1097,971],{"class":798},[714,1099,899],{"class":794},[714,1101,1102],{"class":798},"eventSourceARN",[714,1104,802],{"class":794},[714,1106,802],{"class":794},[714,1108,919],{"class":867},[714,1110,1112],{"class":716,"line":1111},17,[714,1113,1115],{"class":1114},"sHwdD","      \u002F\u002F … parse record.body and process the message\n",[714,1117,1119,1121,1123,1125,1127,1129,1132,1134,1136,1139,1141,1143],{"class":716,"line":1118},18,[714,1120,1073],{"class":798},[714,1122,899],{"class":794},[714,1124,1078],{"class":854},[714,1126,858],{"class":867},[714,1128,1083],{"class":794},[714,1130,1131],{"class":867}," status",[714,1133,871],{"class":794},[714,1135,808],{"class":794},[714,1137,1138],{"class":723},"ok",[714,1140,886],{"class":794},[714,1142,802],{"class":794},[714,1144,919],{"class":867},[714,1146,1148,1150,1153,1155,1158,1160],{"class":716,"line":1147},19,[714,1149,1052],{"class":794},[714,1151,1152],{"class":787}," catch",[714,1154,965],{"class":867},[714,1156,1157],{"class":798},"error",[714,1159,985],{"class":867},[714,1161,861],{"class":794},[714,1163,1165,1167,1169,1171,1173,1175,1178,1181,1184,1187,1190,1193,1195,1197,1200,1202,1204],{"class":716,"line":1164},20,[714,1166,1073],{"class":798},[714,1168,899],{"class":794},[714,1170,1157],{"class":854},[714,1172,858],{"class":867},[714,1174,1157],{"class":798},[714,1176,1177],{"class":794}," instanceof",[714,1179,1180],{"class":720}," Error",[714,1182,1183],{"class":794}," ?",[714,1185,1186],{"class":798}," error",[714,1188,1189],{"class":794}," :",[714,1191,1192],{"class":794}," new",[714,1194,1180],{"class":854},[714,1196,858],{"class":867},[714,1198,1199],{"class":854},"String",[714,1201,858],{"class":867},[714,1203,1157],{"class":798},[714,1205,1206],{"class":867},")))\n",[714,1208,1210,1212,1214,1216,1218,1220,1222,1224,1226,1228,1230,1232],{"class":716,"line":1209},21,[714,1211,1073],{"class":798},[714,1213,899],{"class":794},[714,1215,1078],{"class":854},[714,1217,858],{"class":867},[714,1219,1083],{"class":794},[714,1221,1131],{"class":867},[714,1223,871],{"class":794},[714,1225,808],{"class":794},[714,1227,1157],{"class":723},[714,1229,886],{"class":794},[714,1231,802],{"class":794},[714,1233,919],{"class":867},[714,1235,1237,1240],{"class":716,"line":1236},22,[714,1238,1239],{"class":787},"      throw",[714,1241,1242],{"class":798}," error\n",[714,1244,1246,1248,1251],{"class":716,"line":1245},23,[714,1247,1052],{"class":794},[714,1249,1250],{"class":787}," finally",[714,1252,956],{"class":794},[714,1254,1256,1258,1260,1263],{"class":716,"line":1255},24,[714,1257,1073],{"class":798},[714,1259,899],{"class":794},[714,1261,1262],{"class":854},"emit",[714,1264,1265],{"class":867},"()\n",[714,1267,1269],{"class":716,"line":1268},25,[714,1270,1271],{"class":794},"    }\n",[714,1273,1275],{"class":716,"line":1274},26,[714,1276,1277],{"class":794},"  }\n",[714,1279,1281],{"class":716,"line":1280},27,[714,1282,1283],{"class":794},"}\n",[573,1285,1286,1287,668,1290,1292],{},"If you process the whole batch as one logical unit, use a ",[577,1288,1289],{},"single",[587,1291,597],{}," per handler invocation with batch metadata instead of one logger per record.",[644,1294,1296,1297],{"id":1295},"stdout-and-silent","Stdout and ",[587,1298,1299],{},"silent",[573,1301,1302,1303,1306,1307,1310,1311,1314,1315,899],{},"Many teams ingest Lambda logs from ",[577,1304,1305],{},"CloudWatch"," via stdout. If you use a ",[577,1308,1309],{},"drain adapter"," (OTLP, Datadog, Axiom, etc.) and want JSON or platform-specific formatting without duplicate console noise, set ",[587,1312,1313],{},"silent: true"," in production. See ",[582,1316,512],{"href":1317},"\u002Freference\u002Fconfiguration#silence-the-terminal",[704,1319,1321],{"className":777,"code":1320,"filename":779,"language":780,"meta":710,"style":710},"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",[587,1322,1323,1343,1361,1365,1373,1394,1423,1437],{"__ignoreMap":710},[714,1324,1325,1327,1329,1332,1334,1336,1338,1341],{"class":716,"line":717},[714,1326,788],{"class":787},[714,1328,795],{"class":794},[714,1330,1331],{"class":798}," createAxiomDrain",[714,1333,802],{"class":794},[714,1335,805],{"class":787},[714,1337,808],{"class":794},[714,1339,1340],{"class":723},"evlog\u002Faxiom",[714,1342,814],{"class":794},[714,1344,1345,1347,1349,1351,1353,1355,1357,1359],{"class":716,"line":817},[714,1346,788],{"class":787},[714,1348,795],{"class":794},[714,1350,824],{"class":798},[714,1352,802],{"class":794},[714,1354,805],{"class":787},[714,1356,808],{"class":794},[714,1358,839],{"class":723},[714,1360,814],{"class":794},[714,1362,1363],{"class":716,"line":844},[714,1364,848],{"emptyLinePlaceholder":847},[714,1366,1367,1369,1371],{"class":716,"line":851},[714,1368,855],{"class":854},[714,1370,858],{"class":798},[714,1372,861],{"class":794},[714,1374,1375,1377,1379,1381,1383,1385,1387,1389,1391],{"class":716,"line":864},[714,1376,868],{"class":867},[714,1378,871],{"class":794},[714,1380,795],{"class":794},[714,1382,876],{"class":867},[714,1384,871],{"class":794},[714,1386,808],{"class":794},[714,1388,883],{"class":723},[714,1390,886],{"class":794},[714,1392,1393],{"class":794}," },\n",[714,1395,1396,1399,1401,1403,1405,1407,1409,1411,1414,1416,1419,1421],{"class":716,"line":913},[714,1397,1398],{"class":867},"  silent",[714,1400,871],{"class":794},[714,1402,896],{"class":798},[714,1404,899],{"class":794},[714,1406,902],{"class":798},[714,1408,899],{"class":794},[714,1410,907],{"class":798},[714,1412,1413],{"class":794},"===",[714,1415,808],{"class":794},[714,1417,1418],{"class":723},"production",[714,1420,886],{"class":794},[714,1422,1023],{"class":794},[714,1424,1425,1428,1430,1432,1435],{"class":716,"line":922},[714,1426,1427],{"class":867},"  drain",[714,1429,871],{"class":794},[714,1431,1331],{"class":854},[714,1433,1434],{"class":798},"()",[714,1436,1023],{"class":794},[714,1438,1439,1441],{"class":716,"line":927},[714,1440,916],{"class":794},[714,1442,919],{"class":798},[1444,1445,1448,1449,1451,1452,1455],"callout",{"color":1446,"icon":1447},"warning","i-lucide-alert-triangle","If ",[587,1450,1299],{}," is enabled without a ",[587,1453,1454],{},"drain",", events may not be visible anywhere. See the configuration docs for details.",[644,1457,1459],{"id":1458},"error-handling","Error handling",[573,1461,1462,1463,1466,1467,1470,1471,1470,1474,1477],{},"Use ",[587,1464,1465],{},"createError"," where you want structured fields (",[587,1468,1469],{},"why",", ",[587,1472,1473],{},"fix",[587,1475,1476],{},"link","). Map failures to your Lambda return or rethrow so SQS retry\u002FDLQ behavior stays correct. evlog does not replace AWS error semantics.",[704,1479,1481],{"className":777,"code":1480,"filename":779,"language":780,"meta":710,"style":710},"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",[587,1482,1483,1502,1506,1517,1533,1546,1562,1578],{"__ignoreMap":710},[714,1484,1485,1487,1489,1492,1494,1496,1498,1500],{"class":716,"line":717},[714,1486,788],{"class":787},[714,1488,795],{"class":794},[714,1490,1491],{"class":798}," createError",[714,1493,802],{"class":794},[714,1495,805],{"class":787},[714,1497,808],{"class":794},[714,1499,839],{"class":723},[714,1501,814],{"class":794},[714,1503,1504],{"class":716,"line":817},[714,1505,848],{"emptyLinePlaceholder":847},[714,1507,1508,1511,1513,1515],{"class":716,"line":844},[714,1509,1510],{"class":787},"throw",[714,1512,1491],{"class":854},[714,1514,858],{"class":798},[714,1516,861],{"class":794},[714,1518,1519,1522,1524,1526,1529,1531],{"class":716,"line":851},[714,1520,1521],{"class":867},"  message",[714,1523,871],{"class":794},[714,1525,808],{"class":794},[714,1527,1528],{"class":723},"Invalid payload",[714,1530,886],{"class":794},[714,1532,1023],{"class":794},[714,1534,1535,1538,1540,1544],{"class":716,"line":864},[714,1536,1537],{"class":867},"  status",[714,1539,871],{"class":794},[714,1541,1543],{"class":1542},"sbssI"," 400",[714,1545,1023],{"class":794},[714,1547,1548,1551,1553,1555,1558,1560],{"class":716,"line":913},[714,1549,1550],{"class":867},"  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