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Install",[668,669,670,695,709,723],"code-group",{},[671,672,678],"pre",{"className":673,"code":674,"filename":675,"language":676,"meta":677,"style":677},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog\n","pnpm","bash","",[554,679,680],{"__ignoreMap":677},[681,682,685,688,692],"span",{"class":683,"line":684},"line",1,[681,686,675],{"class":687},"sBMFI",[681,689,691],{"class":690},"sfazB"," add",[681,693,694],{"class":690}," evlog\n",[671,696,699],{"className":673,"code":697,"filename":698,"language":676,"meta":677,"style":677},"bun add evlog\n","bun",[554,700,701],{"__ignoreMap":677},[681,702,703,705,707],{"class":683,"line":684},[681,704,698],{"class":687},[681,706,691],{"class":690},[681,708,694],{"class":690},[671,710,713],{"className":673,"code":711,"filename":712,"language":676,"meta":677,"style":677},"yarn add evlog\n","yarn",[554,714,715],{"__ignoreMap":677},[681,716,717,719,721],{"class":683,"line":684},[681,718,712],{"class":687},[681,720,691],{"class":690},[681,722,694],{"class":690},[671,724,727],{"className":673,"code":725,"filename":726,"language":676,"meta":677,"style":677},"npm install evlog\n","npm",[554,728,729],{"__ignoreMap":677},[681,730,731,733,736],{"class":683,"line":684},[681,732,726],{"class":687},[681,734,735],{"class":690}," install",[681,737,694],{"class":690},[663,739,741],{"id":740},"_2-initialize-once-log-per-invocation","2. Initialize once, log per invocation",[671,743,748],{"className":744,"code":745,"filename":746,"language":747,"meta":677,"style":677},"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",[554,749,750,782,809,816,829,878,887,892,924,955,973,991,1014,1022,1027,1035,1076,1083,1112,1129,1174,1201,1210,1220,1233,1239,1245],{"__ignoreMap":677},[681,751,752,756,759,763,767,770,773,776,779],{"class":683,"line":684},[681,753,755],{"class":754},"s7zQu","import",[681,757,758],{"class":754}," type",[681,760,762],{"class":761},"sMK4o"," {",[681,764,766],{"class":765},"sTEyZ"," SQSEvent",[681,768,769],{"class":761}," }",[681,771,772],{"class":754}," from",[681,774,775],{"class":761}," '",[681,777,778],{"class":690},"aws-lambda",[681,780,781],{"class":761},"'\n",[681,783,785,787,789,792,795,798,800,802,804,807],{"class":683,"line":784},2,[681,786,755],{"class":754},[681,788,762],{"class":761},[681,790,791],{"class":765}," initLogger",[681,793,794],{"class":761},",",[681,796,797],{"class":765}," createLogger",[681,799,769],{"class":761},[681,801,772],{"class":754},[681,803,775],{"class":761},[681,805,806],{"class":690},"evlog",[681,808,781],{"class":761},[681,810,812],{"class":683,"line":811},3,[681,813,815],{"emptyLinePlaceholder":814},true,"\n",[681,817,819,823,826],{"class":683,"line":818},4,[681,820,822],{"class":821},"s2Zo4","initLogger",[681,824,825],{"class":765},"(",[681,827,828],{"class":761},"{\n",[681,830,832,836,839,841,844,846,848,851,854,856,859,861,864,867,870,872,875],{"class":683,"line":831},5,[681,833,835],{"class":834},"swJcz","  env",[681,837,838],{"class":761},":",[681,840,762],{"class":761},[681,842,843],{"class":834}," service",[681,845,838],{"class":761},[681,847,775],{"class":761},[681,849,850],{"class":690},"sqs-consumer",[681,852,853],{"class":761},"'",[681,855,794],{"class":761},[681,857,858],{"class":834}," environment",[681,860,838],{"class":761},[681,862,863],{"class":765}," process",[681,865,866],{"class":761},".",[681,868,869],{"class":765},"env",[681,871,866],{"class":761},[681,873,874],{"class":765},"NODE_ENV ",[681,876,877],{"class":761},"},\n",[681,879,881,884],{"class":683,"line":880},6,[681,882,883],{"class":761},"}",[681,885,886],{"class":765},")\n",[681,888,890],{"class":683,"line":889},7,[681,891,815],{"emptyLinePlaceholder":814},[681,893,895,898,902,905,908,910,914,916,918,921],{"class":683,"line":894},8,[681,896,897],{"class":754},"export",[681,899,901],{"class":900},"spNyl"," async",[681,903,904],{"class":900}," function",[681,906,907],{"class":821}," handler",[681,909,825],{"class":761},[681,911,913],{"class":912},"sHdIc","event",[681,915,838],{"class":761},[681,917,766],{"class":687},[681,919,920],{"class":761},")",[681,922,923],{"class":761}," {\n",[681,925,927,930,933,936,939,942,945,947,950,953],{"class":683,"line":926},9,[681,928,929],{"class":754},"  for",[681,931,932],{"class":834}," (",[681,934,935],{"class":900},"const",[681,937,938],{"class":765}," record",[681,940,941],{"class":761}," of",[681,943,944],{"class":765}," event",[681,946,866],{"class":761},[681,948,949],{"class":765},"Records",[681,951,952],{"class":834},") ",[681,954,828],{"class":761},[681,956,958,961,964,967,969,971],{"class":683,"line":957},10,[681,959,960],{"class":900},"    const",[681,962,963],{"class":765}," log",[681,965,966],{"class":761}," =",[681,968,797],{"class":821},[681,970,825],{"class":834},[681,972,828],{"class":761},[681,974,976,979,981,983,985,988],{"class":683,"line":975},11,[681,977,978],{"class":834},"      messageId",[681,980,838],{"class":761},[681,982,938],{"class":765},[681,984,866],{"class":761},[681,986,987],{"class":765},"messageId",[681,989,990],{"class":761},",\n",[681,992,994,997,999,1001,1003,1006,1009,1012],{"class":683,"line":993},12,[681,995,996],{"class":834},"      approximateReceiveCount",[681,998,838],{"class":761},[681,1000,938],{"class":765},[681,1002,866],{"class":761},[681,1004,1005],{"class":765},"attributes",[681,1007,1008],{"class":761},"?.",[681,1010,1011],{"class":765},"ApproximateReceiveCount",[681,1013,990],{"class":761},[681,1015,1017,1020],{"class":683,"line":1016},13,[681,1018,1019],{"class":761},"    }",[681,1021,886],{"class":834},[681,1023,1025],{"class":683,"line":1024},14,[681,1026,815],{"emptyLinePlaceholder":814},[681,1028,1030,1033],{"class":683,"line":1029},15,[681,1031,1032],{"class":754},"    try",[681,1034,923],{"class":761},[681,1036,1038,1041,1043,1046,1048,1051,1054,1056,1058,1061,1063,1065,1067,1070,1072,1074],{"class":683,"line":1037},16,[681,1039,1040],{"class":765},"      log",[681,1042,866],{"class":761},[681,1044,1045],{"class":821},"set",[681,1047,825],{"class":834},[681,1049,1050],{"class":761},"{",[681,1052,1053],{"class":834}," queue",[681,1055,838],{"class":761},[681,1057,762],{"class":761},[681,1059,1060],{"class":834}," name",[681,1062,838],{"class":761},[681,1064,938],{"class":765},[681,1066,866],{"class":761},[681,1068,1069],{"class":765},"eventSourceARN",[681,1071,769],{"class":761},[681,1073,769],{"class":761},[681,1075,886],{"class":834},[681,1077,1079],{"class":683,"line":1078},17,[681,1080,1082],{"class":1081},"sHwdD","      \u002F\u002F … parse record.body and process the message\n",[681,1084,1086,1088,1090,1092,1094,1096,1099,1101,1103,1106,1108,1110],{"class":683,"line":1085},18,[681,1087,1040],{"class":765},[681,1089,866],{"class":761},[681,1091,1045],{"class":821},[681,1093,825],{"class":834},[681,1095,1050],{"class":761},[681,1097,1098],{"class":834}," status",[681,1100,838],{"class":761},[681,1102,775],{"class":761},[681,1104,1105],{"class":690},"ok",[681,1107,853],{"class":761},[681,1109,769],{"class":761},[681,1111,886],{"class":834},[681,1113,1115,1117,1120,1122,1125,1127],{"class":683,"line":1114},19,[681,1116,1019],{"class":761},[681,1118,1119],{"class":754}," catch",[681,1121,932],{"class":834},[681,1123,1124],{"class":765},"error",[681,1126,952],{"class":834},[681,1128,828],{"class":761},[681,1130,1132,1134,1136,1138,1140,1142,1145,1148,1151,1154,1157,1160,1162,1164,1167,1169,1171],{"class":683,"line":1131},20,[681,1133,1040],{"class":765},[681,1135,866],{"class":761},[681,1137,1124],{"class":821},[681,1139,825],{"class":834},[681,1141,1124],{"class":765},[681,1143,1144],{"class":761}," instanceof",[681,1146,1147],{"class":687}," Error",[681,1149,1150],{"class":761}," ?",[681,1152,1153],{"class":765}," error",[681,1155,1156],{"class":761}," :",[681,1158,1159],{"class":761}," new",[681,1161,1147],{"class":821},[681,1163,825],{"class":834},[681,1165,1166],{"class":821},"String",[681,1168,825],{"class":834},[681,1170,1124],{"class":765},[681,1172,1173],{"class":834},")))\n",[681,1175,1177,1179,1181,1183,1185,1187,1189,1191,1193,1195,1197,1199],{"class":683,"line":1176},21,[681,1178,1040],{"class":765},[681,1180,866],{"class":761},[681,1182,1045],{"class":821},[681,1184,825],{"class":834},[681,1186,1050],{"class":761},[681,1188,1098],{"class":834},[681,1190,838],{"class":761},[681,1192,775],{"class":761},[681,1194,1124],{"class":690},[681,1196,853],{"class":761},[681,1198,769],{"class":761},[681,1200,886],{"class":834},[681,1202,1204,1207],{"class":683,"line":1203},22,[681,1205,1206],{"class":754},"      throw",[681,1208,1209],{"class":765}," error\n",[681,1211,1213,1215,1218],{"class":683,"line":1212},23,[681,1214,1019],{"class":761},[681,1216,1217],{"class":754}," finally",[681,1219,923],{"class":761},[681,1221,1223,1225,1227,1230],{"class":683,"line":1222},24,[681,1224,1040],{"class":765},[681,1226,866],{"class":761},[681,1228,1229],{"class":821},"emit",[681,1231,1232],{"class":834},"()\n",[681,1234,1236],{"class":683,"line":1235},25,[681,1237,1238],{"class":761},"    }\n",[681,1240,1242],{"class":683,"line":1241},26,[681,1243,1244],{"class":761},"  }\n",[681,1246,1248],{"class":683,"line":1247},27,[681,1249,1250],{"class":761},"}\n",[540,1252,1253,1254,635,1257,1259],{},"If you process the whole batch as one logical unit, use a ",[544,1255,1256],{},"single",[554,1258,564],{}," per handler invocation with batch metadata instead of one logger per record.",[611,1261,1263,1264],{"id":1262},"stdout-and-silent","Stdout and ",[554,1265,1266],{},"silent",[540,1268,1269,1270,1273,1274,1277,1278,1281,1282,866],{},"Many teams ingest Lambda logs from ",[544,1271,1272],{},"CloudWatch"," via stdout. If you use a ",[544,1275,1276],{},"drain adapter"," (OTLP, Datadog, Axiom, etc.) and want JSON or platform-specific formatting without duplicate console noise, set ",[554,1279,1280],{},"silent: true"," in production—see ",[549,1283,504],{"href":1284},"\u002Freference\u002Fconfiguration#silent-mode",[671,1286,1288],{"className":744,"code":1287,"filename":746,"language":747,"meta":677,"style":677},"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",[554,1289,1290,1310,1328,1332,1340,1361,1390,1404],{"__ignoreMap":677},[681,1291,1292,1294,1296,1299,1301,1303,1305,1308],{"class":683,"line":684},[681,1293,755],{"class":754},[681,1295,762],{"class":761},[681,1297,1298],{"class":765}," createAxiomDrain",[681,1300,769],{"class":761},[681,1302,772],{"class":754},[681,1304,775],{"class":761},[681,1306,1307],{"class":690},"evlog\u002Faxiom",[681,1309,781],{"class":761},[681,1311,1312,1314,1316,1318,1320,1322,1324,1326],{"class":683,"line":784},[681,1313,755],{"class":754},[681,1315,762],{"class":761},[681,1317,791],{"class":765},[681,1319,769],{"class":761},[681,1321,772],{"class":754},[681,1323,775],{"class":761},[681,1325,806],{"class":690},[681,1327,781],{"class":761},[681,1329,1330],{"class":683,"line":811},[681,1331,815],{"emptyLinePlaceholder":814},[681,1333,1334,1336,1338],{"class":683,"line":818},[681,1335,822],{"class":821},[681,1337,825],{"class":765},[681,1339,828],{"class":761},[681,1341,1342,1344,1346,1348,1350,1352,1354,1356,1358],{"class":683,"line":831},[681,1343,835],{"class":834},[681,1345,838],{"class":761},[681,1347,762],{"class":761},[681,1349,843],{"class":834},[681,1351,838],{"class":761},[681,1353,775],{"class":761},[681,1355,850],{"class":690},[681,1357,853],{"class":761},[681,1359,1360],{"class":761}," },\n",[681,1362,1363,1366,1368,1370,1372,1374,1376,1378,1381,1383,1386,1388],{"class":683,"line":880},[681,1364,1365],{"class":834},"  silent",[681,1367,838],{"class":761},[681,1369,863],{"class":765},[681,1371,866],{"class":761},[681,1373,869],{"class":765},[681,1375,866],{"class":761},[681,1377,874],{"class":765},[681,1379,1380],{"class":761},"===",[681,1382,775],{"class":761},[681,1384,1385],{"class":690},"production",[681,1387,853],{"class":761},[681,1389,990],{"class":761},[681,1391,1392,1395,1397,1399,1402],{"class":683,"line":889},[681,1393,1394],{"class":834},"  drain",[681,1396,838],{"class":761},[681,1398,1298],{"class":821},[681,1400,1401],{"class":765},"()",[681,1403,990],{"class":761},[681,1405,1406,1408],{"class":683,"line":894},[681,1407,883],{"class":761},[681,1409,886],{"class":765},[1411,1412,1415,1416,1418,1419,1422],"callout",{"color":1413,"icon":1414},"warning","i-lucide-alert-triangle","If ",[554,1417,1266],{}," is enabled without a ",[554,1420,1421],{},"drain",", events may not be visible anywhere. See the configuration docs for details.",[611,1424,1426],{"id":1425},"error-handling","Error handling",[540,1428,1429,1430,1433,1434,1437,1438,1437,1441,1444],{},"Use ",[554,1431,1432],{},"createError"," where you want structured fields (",[554,1435,1436],{},"why",", ",[554,1439,1440],{},"fix",[554,1442,1443],{},"link","). Map failures to your Lambda return or rethrow so SQS retry\u002FDLQ behavior stays correct—evlog does not replace AWS error semantics.",[671,1446,1448],{"className":744,"code":1447,"filename":746,"language":747,"meta":677,"style":677},"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",[554,1449,1450,1469,1473,1484,1500,1513,1529,1545],{"__ignoreMap":677},[681,1451,1452,1454,1456,1459,1461,1463,1465,1467],{"class":683,"line":684},[681,1453,755],{"class":754},[681,1455,762],{"class":761},[681,1457,1458],{"class":765}," createError",[681,1460,769],{"class":761},[681,1462,772],{"class":754},[681,1464,775],{"class":761},[681,1466,806],{"class":690},[681,1468,781],{"class":761},[681,1470,1471],{"class":683,"line":784},[681,1472,815],{"emptyLinePlaceholder":814},[681,1474,1475,1478,1480,1482],{"class":683,"line":811},[681,1476,1477],{"class":754},"throw",[681,1479,1458],{"class":821},[681,1481,825],{"class":765},[681,1483,828],{"class":761},[681,1485,1486,1489,1491,1493,1496,1498],{"class":683,"line":818},[681,1487,1488],{"class":834},"  message",[681,1490,838],{"class":761},[681,1492,775],{"class":761},[681,1494,1495],{"class":690},"Invalid payload",[681,1497,853],{"class":761},[681,1499,990],{"class":761},[681,1501,1502,1505,1507,1511],{"class":683,"line":831},[681,1503,1504],{"class":834},"  status",[681,1506,838],{"class":761},[681,1508,1510],{"class":1509},"sbssI"," 400",[681,1512,990],{"class":761},[681,1514,1515,1518,1520,1522,1525,1527],{"class":683,"line":880},[681,1516,1517],{"class":834},"  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