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",[618,619,620],"code",{},"initLogger()"," once, create a logger ",[608,623,624],{},"per invocation"," (or per SQS message) with ",[618,627,628],{},"createLogger()",", then call ",[618,631,632],{},"log.emit()"," when work finishes.",[635,636,639,642,661],"prompt",{":actions":637,"description":638,"icon":317},"[\"copy\",\"cursor\",\"claude\"]","Set up evlog in my AWS Lambda function",[604,640,641],{},"Set up evlog in an AWS Lambda function (e.g. SQS consumer).",[643,644,645,649,652,655,658],"ul",{},[646,647,648],"li",{},"Install evlog: pnpm add evlog",[646,650,651],{},"Call initLogger({ env: { service: 'my-fn' } }) once at module load (cold start)",[646,653,654],{},"In the handler, create a new createLogger({ messageId, ... }) per invocation or per message",[646,656,657],{},"Use log.set() to accumulate context; call log.emit() when done",[646,659,660],{},"Avoid a single module-level logger instance reused across invocations (Lambda reuses runtimes)",[604,662,663,664,669,670],{},"Docs: ",[613,665,666],{"href":666,"rel":667},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fframeworks\u002Faws-lambda",[668],"nofollow","\nAdapters: ",[613,671,672],{"href":672,"rel":673},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Foverview",[668],[675,676,678,679,682],"h2",{"id":677},"why-not-one-global-createlogger","Why not one global ",[618,680,681],{},"createLogger","?",[604,684,685,686,689,690,693],{},"Lambda ",[608,687,688],{},"execution environments are reused",": the same process can handle many invocations in sequence. Module-level variables persist, so ",[608,691,692],{},"one shared logger instance"," can leak fields from a previous invocation into the next.",[604,695,696,699,700,702,703,708],{},[608,697,698],{},"Do this:"," ",[618,701,620],{}," once at the top level (configuration only), and ",[608,704,705,707],{},[618,706,628],{}," inside the handler"," (or inside the loop over SQS records) for each unit of work.",[604,710,711,714,715,718,719,722],{},[608,712,713],{},"Dependency injection"," (passing ",[618,716,717],{},"log"," into functions) is optional, it helps tests and clarity, but what matters is ",[608,720,721],{},"one logger per invocation",", not whether you use DI.",[675,724,25],{"id":725},"quick-start",[727,728,730],"h3",{"id":729},"_1-install","1. Install",[732,733,734,759,773,787],"code-group",{},[735,736,742],"pre",{"className":737,"code":738,"filename":739,"language":740,"meta":741,"style":741},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog\n","pnpm","bash","",[618,743,744],{"__ignoreMap":741},[745,746,749,752,756],"span",{"class":747,"line":748},"line",1,[745,750,739],{"class":751},"sBMFI",[745,753,755],{"class":754},"sfazB"," add",[745,757,758],{"class":754}," evlog\n",[735,760,763],{"className":737,"code":761,"filename":762,"language":740,"meta":741,"style":741},"bun add evlog\n","bun",[618,764,765],{"__ignoreMap":741},[745,766,767,769,771],{"class":747,"line":748},[745,768,762],{"class":751},[745,770,755],{"class":754},[745,772,758],{"class":754},[735,774,777],{"className":737,"code":775,"filename":776,"language":740,"meta":741,"style":741},"yarn add evlog\n","yarn",[618,778,779],{"__ignoreMap":741},[745,780,781,783,785],{"class":747,"line":748},[745,782,776],{"class":751},[745,784,755],{"class":754},[745,786,758],{"class":754},[735,788,791],{"className":737,"code":789,"filename":790,"language":740,"meta":741,"style":741},"npm install evlog\n","npm",[618,792,793],{"__ignoreMap":741},[745,794,795,797,800],{"class":747,"line":748},[745,796,790],{"class":751},[745,798,799],{"class":754}," install",[745,801,758],{"class":754},[727,803,805],{"id":804},"_2-initialize-once-log-per-invocation","2. Initialize once, log per invocation",[735,807,812],{"className":808,"code":809,"filename":810,"language":811,"meta":741,"style":741},"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",[618,813,814,846,873,880,893,942,951,956,988,1019,1037,1055,1078,1086,1091,1099,1140,1147,1176,1193,1238,1265,1274,1284,1297,1303,1309],{"__ignoreMap":741},[745,815,816,820,823,827,831,834,837,840,843],{"class":747,"line":748},[745,817,819],{"class":818},"s7zQu","import",[745,821,822],{"class":818}," type",[745,824,826],{"class":825},"sMK4o"," {",[745,828,830],{"class":829},"sTEyZ"," SQSEvent",[745,832,833],{"class":825}," }",[745,835,836],{"class":818}," from",[745,838,839],{"class":825}," '",[745,841,842],{"class":754},"aws-lambda",[745,844,845],{"class":825},"'\n",[745,847,849,851,853,856,859,862,864,866,868,871],{"class":747,"line":848},2,[745,850,819],{"class":818},[745,852,826],{"class":825},[745,854,855],{"class":829}," initLogger",[745,857,858],{"class":825},",",[745,860,861],{"class":829}," createLogger",[745,863,833],{"class":825},[745,865,836],{"class":818},[745,867,839],{"class":825},[745,869,870],{"class":754},"evlog",[745,872,845],{"class":825},[745,874,876],{"class":747,"line":875},3,[745,877,879],{"emptyLinePlaceholder":878},true,"\n",[745,881,883,887,890],{"class":747,"line":882},4,[745,884,886],{"class":885},"s2Zo4","initLogger",[745,888,889],{"class":829},"(",[745,891,892],{"class":825},"{\n",[745,894,896,900,903,905,908,910,912,915,918,920,923,925,928,931,934,936,939],{"class":747,"line":895},5,[745,897,899],{"class":898},"swJcz","  env",[745,901,902],{"class":825},":",[745,904,826],{"class":825},[745,906,907],{"class":898}," service",[745,909,902],{"class":825},[745,911,839],{"class":825},[745,913,914],{"class":754},"sqs-consumer",[745,916,917],{"class":825},"'",[745,919,858],{"class":825},[745,921,922],{"class":898}," environment",[745,924,902],{"class":825},[745,926,927],{"class":829}," process",[745,929,930],{"class":825},".",[745,932,933],{"class":829},"env",[745,935,930],{"class":825},[745,937,938],{"class":829},"NODE_ENV ",[745,940,941],{"class":825},"},\n",[745,943,945,948],{"class":747,"line":944},6,[745,946,947],{"class":825},"}",[745,949,950],{"class":829},")\n",[745,952,954],{"class":747,"line":953},7,[745,955,879],{"emptyLinePlaceholder":878},[745,957,959,962,966,969,972,974,978,980,982,985],{"class":747,"line":958},8,[745,960,961],{"class":818},"export",[745,963,965],{"class":964},"spNyl"," async",[745,967,968],{"class":964}," function",[745,970,971],{"class":885}," handler",[745,973,889],{"class":825},[745,975,977],{"class":976},"sHdIc","event",[745,979,902],{"class":825},[745,981,830],{"class":751},[745,983,984],{"class":825},")",[745,986,987],{"class":825}," {\n",[745,989,991,994,997,1000,1003,1006,1009,1011,1014,1017],{"class":747,"line":990},9,[745,992,993],{"class":818},"  for",[745,995,996],{"class":898}," (",[745,998,999],{"class":964},"const",[745,1001,1002],{"class":829}," record",[745,1004,1005],{"class":825}," of",[745,1007,1008],{"class":829}," event",[745,1010,930],{"class":825},[745,1012,1013],{"class":829},"Records",[745,1015,1016],{"class":898},") ",[745,1018,892],{"class":825},[745,1020,1022,1025,1028,1031,1033,1035],{"class":747,"line":1021},10,[745,1023,1024],{"class":964},"    const",[745,1026,1027],{"class":829}," log",[745,1029,1030],{"class":825}," =",[745,1032,861],{"class":885},[745,1034,889],{"class":898},[745,1036,892],{"class":825},[745,1038,1040,1043,1045,1047,1049,1052],{"class":747,"line":1039},11,[745,1041,1042],{"class":898},"      messageId",[745,1044,902],{"class":825},[745,1046,1002],{"class":829},[745,1048,930],{"class":825},[745,1050,1051],{"class":829},"messageId",[745,1053,1054],{"class":825},",\n",[745,1056,1058,1061,1063,1065,1067,1070,1073,1076],{"class":747,"line":1057},12,[745,1059,1060],{"class":898},"      approximateReceiveCount",[745,1062,902],{"class":825},[745,1064,1002],{"class":829},[745,1066,930],{"class":825},[745,1068,1069],{"class":829},"attributes",[745,1071,1072],{"class":825},"?.",[745,1074,1075],{"class":829},"ApproximateReceiveCount",[745,1077,1054],{"class":825},[745,1079,1081,1084],{"class":747,"line":1080},13,[745,1082,1083],{"class":825},"    }",[745,1085,950],{"class":898},[745,1087,1089],{"class":747,"line":1088},14,[745,1090,879],{"emptyLinePlaceholder":878},[745,1092,1094,1097],{"class":747,"line":1093},15,[745,1095,1096],{"class":818},"    try",[745,1098,987],{"class":825},[745,1100,1102,1105,1107,1110,1112,1115,1118,1120,1122,1125,1127,1129,1131,1134,1136,1138],{"class":747,"line":1101},16,[745,1103,1104],{"class":829},"      log",[745,1106,930],{"class":825},[745,1108,1109],{"class":885},"set",[745,1111,889],{"class":898},[745,1113,1114],{"class":825},"{",[745,1116,1117],{"class":898}," queue",[745,1119,902],{"class":825},[745,1121,826],{"class":825},[745,1123,1124],{"class":898}," name",[745,1126,902],{"class":825},[745,1128,1002],{"class":829},[745,1130,930],{"class":825},[745,1132,1133],{"class":829},"eventSourceARN",[745,1135,833],{"class":825},[745,1137,833],{"class":825},[745,1139,950],{"class":898},[745,1141,1143],{"class":747,"line":1142},17,[745,1144,1146],{"class":1145},"sHwdD","      \u002F\u002F … parse record.body and process the message\n",[745,1148,1150,1152,1154,1156,1158,1160,1163,1165,1167,1170,1172,1174],{"class":747,"line":1149},18,[745,1151,1104],{"class":829},[745,1153,930],{"class":825},[745,1155,1109],{"class":885},[745,1157,889],{"class":898},[745,1159,1114],{"class":825},[745,1161,1162],{"class":898}," status",[745,1164,902],{"class":825},[745,1166,839],{"class":825},[745,1168,1169],{"class":754},"ok",[745,1171,917],{"class":825},[745,1173,833],{"class":825},[745,1175,950],{"class":898},[745,1177,1179,1181,1184,1186,1189,1191],{"class":747,"line":1178},19,[745,1180,1083],{"class":825},[745,1182,1183],{"class":818}," catch",[745,1185,996],{"class":898},[745,1187,1188],{"class":829},"error",[745,1190,1016],{"class":898},[745,1192,892],{"class":825},[745,1194,1196,1198,1200,1202,1204,1206,1209,1212,1215,1218,1221,1224,1226,1228,1231,1233,1235],{"class":747,"line":1195},20,[745,1197,1104],{"class":829},[745,1199,930],{"class":825},[745,1201,1188],{"class":885},[745,1203,889],{"class":898},[745,1205,1188],{"class":829},[745,1207,1208],{"class":825}," instanceof",[745,1210,1211],{"class":751}," Error",[745,1213,1214],{"class":825}," ?",[745,1216,1217],{"class":829}," error",[745,1219,1220],{"class":825}," :",[745,1222,1223],{"class":825}," new",[745,1225,1211],{"class":885},[745,1227,889],{"class":898},[745,1229,1230],{"class":885},"String",[745,1232,889],{"class":898},[745,1234,1188],{"class":829},[745,1236,1237],{"class":898},")))\n",[745,1239,1241,1243,1245,1247,1249,1251,1253,1255,1257,1259,1261,1263],{"class":747,"line":1240},21,[745,1242,1104],{"class":829},[745,1244,930],{"class":825},[745,1246,1109],{"class":885},[745,1248,889],{"class":898},[745,1250,1114],{"class":825},[745,1252,1162],{"class":898},[745,1254,902],{"class":825},[745,1256,839],{"class":825},[745,1258,1188],{"class":754},[745,1260,917],{"class":825},[745,1262,833],{"class":825},[745,1264,950],{"class":898},[745,1266,1268,1271],{"class":747,"line":1267},22,[745,1269,1270],{"class":818},"      throw",[745,1272,1273],{"class":829}," error\n",[745,1275,1277,1279,1282],{"class":747,"line":1276},23,[745,1278,1083],{"class":825},[745,1280,1281],{"class":818}," finally",[745,1283,987],{"class":825},[745,1285,1287,1289,1291,1294],{"class":747,"line":1286},24,[745,1288,1104],{"class":829},[745,1290,930],{"class":825},[745,1292,1293],{"class":885},"emit",[745,1295,1296],{"class":898},"()\n",[745,1298,1300],{"class":747,"line":1299},25,[745,1301,1302],{"class":825},"    }\n",[745,1304,1306],{"class":747,"line":1305},26,[745,1307,1308],{"class":825},"  }\n",[745,1310,1312],{"class":747,"line":1311},27,[745,1313,1314],{"class":825},"}\n",[604,1316,1317,1318,699,1321,1323],{},"If you process the whole batch as one logical unit, use a ",[608,1319,1320],{},"single",[618,1322,628],{}," per handler invocation with batch metadata instead of one logger per record.",[675,1325,1327,1328],{"id":1326},"stdout-and-silent","Stdout and ",[618,1329,1330],{},"silent",[604,1332,1333,1334,1337,1338,1341,1342,1345,1346,930],{},"Many teams ingest Lambda logs from ",[608,1335,1336],{},"CloudWatch"," via stdout. If you use a ",[608,1339,1340],{},"drain adapter"," (OTLP, Datadog, Axiom, etc.) and want JSON or platform-specific formatting without duplicate console noise, set ",[618,1343,1344],{},"silent: true"," in production. See ",[613,1347,543],{"href":1348},"\u002Freference\u002Fconfiguration#silence-the-terminal",[735,1350,1352],{"className":808,"code":1351,"filename":810,"language":811,"meta":741,"style":741},"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",[618,1353,1354,1374,1392,1396,1404,1425,1454,1468],{"__ignoreMap":741},[745,1355,1356,1358,1360,1363,1365,1367,1369,1372],{"class":747,"line":748},[745,1357,819],{"class":818},[745,1359,826],{"class":825},[745,1361,1362],{"class":829}," createAxiomDrain",[745,1364,833],{"class":825},[745,1366,836],{"class":818},[745,1368,839],{"class":825},[745,1370,1371],{"class":754},"evlog\u002Faxiom",[745,1373,845],{"class":825},[745,1375,1376,1378,1380,1382,1384,1386,1388,1390],{"class":747,"line":848},[745,1377,819],{"class":818},[745,1379,826],{"class":825},[745,1381,855],{"class":829},[745,1383,833],{"class":825},[745,1385,836],{"class":818},[745,1387,839],{"class":825},[745,1389,870],{"class":754},[745,1391,845],{"class":825},[745,1393,1394],{"class":747,"line":875},[745,1395,879],{"emptyLinePlaceholder":878},[745,1397,1398,1400,1402],{"class":747,"line":882},[745,1399,886],{"class":885},[745,1401,889],{"class":829},[745,1403,892],{"class":825},[745,1405,1406,1408,1410,1412,1414,1416,1418,1420,1422],{"class":747,"line":895},[745,1407,899],{"class":898},[745,1409,902],{"class":825},[745,1411,826],{"class":825},[745,1413,907],{"class":898},[745,1415,902],{"class":825},[745,1417,839],{"class":825},[745,1419,914],{"class":754},[745,1421,917],{"class":825},[745,1423,1424],{"class":825}," },\n",[745,1426,1427,1430,1432,1434,1436,1438,1440,1442,1445,1447,1450,1452],{"class":747,"line":944},[745,1428,1429],{"class":898},"  silent",[745,1431,902],{"class":825},[745,1433,927],{"class":829},[745,1435,930],{"class":825},[745,1437,933],{"class":829},[745,1439,930],{"class":825},[745,1441,938],{"class":829},[745,1443,1444],{"class":825},"===",[745,1446,839],{"class":825},[745,1448,1449],{"class":754},"production",[745,1451,917],{"class":825},[745,1453,1054],{"class":825},[745,1455,1456,1459,1461,1463,1466],{"class":747,"line":953},[745,1457,1458],{"class":898},"  drain",[745,1460,902],{"class":825},[745,1462,1362],{"class":885},[745,1464,1465],{"class":829},"()",[745,1467,1054],{"class":825},[745,1469,1470,1472],{"class":747,"line":958},[745,1471,947],{"class":825},[745,1473,950],{"class":829},[1475,1476,1479,1480,1482,1483,1486],"callout",{"color":1477,"icon":1478},"warning","i-lucide-alert-triangle","If ",[618,1481,1330],{}," is enabled without a ",[618,1484,1485],{},"drain",", events may not be visible anywhere. See the configuration docs for details.",[675,1488,1490],{"id":1489},"error-handling","Error handling",[604,1492,1493,1494,1497,1498,1501,1502,1501,1505,1508],{},"Use ",[618,1495,1496],{},"createError"," where you want structured fields (",[618,1499,1500],{},"why",", ",[618,1503,1504],{},"fix",[618,1506,1507],{},"link","). Map failures to your Lambda return or rethrow so SQS retry\u002FDLQ behavior stays correct. evlog does not replace AWS error semantics.",[735,1510,1512],{"className":808,"code":1511,"filename":810,"language":811,"meta":741,"style":741},"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",[618,1513,1514,1533,1537,1548,1564,1577,1593,1609],{"__ignoreMap":741},[745,1515,1516,1518,1520,1523,1525,1527,1529,1531],{"class":747,"line":748},[745,1517,819],{"class":818},[745,1519,826],{"class":825},[745,1521,1522],{"class":829}," 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