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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":601,"path":602,"stem":603,"icon":577},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":605,"path":606,"stem":607,"icon":577},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":609,"path":610,"stem":611,"icon":577},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":613,"title":513,"body":614,"description":1316,"extension":1317,"links":1318,"meta":1319,"navigation":1320,"path":514,"seo":1321,"stem":515,"__hash__":1322},"docs\u002F6.extend\u002F2.fs-reader.md",{"type":615,"value":616,"toc":1307},"minimark",[617,652,655,729,734,902,908,912,1013,1016,1020,1190,1200,1204,1262,1271,1275,1303],[618,619,620,621,625,626,630,631,634,635,638,639,642,643,646,647,651],"p",{},"The ",[622,623,624],"a",{"href":227},"filesystem drain"," writes wide events as NDJSON to ",[627,628,629],"code",{},".jsonl"," files under ",[627,632,633],{},".evlog\u002Flogs\u002F"," (one file per day, e.g. ",[627,636,637],{},"2026-05-08.jsonl",", plus rotation suffixes like ",[627,640,641],{},".1.jsonl"," when size-based rotation is enabled). The ",[627,644,645],{},"evlog\u002Ffs"," module also ships ",[648,649,650],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[653,654],"ndjson-tail",{},[656,657,660,663,721],"prompt",{":actions":658,"description":659,"icon":516},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[618,661,662],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[664,665,666,677,690,700,718],"ul",{},[667,668,669,670,672,673,676],"li",{},"Confirm the filesystem drain is wired up (",[627,671,645],{}," adapter writing NDJSON to ",[627,674,675],{},".evlog\u002Flogs\u002F*.jsonl",")",[667,678,679,680,683,684,686,687],{},"For replay: import ",[627,681,682],{},"readFsLogs"," from ",[627,685,645],{}," and iterate ",[627,688,689],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[667,691,692,693,696,697],{},"For follow mode: import ",[627,694,695],{},"tailFsLogs"," and iterate the same way. It watches for new lines, handles rotation, and accepts an ",[627,698,699],{},"AbortSignal",[667,701,702,703,706,707,706,710,713,714,717],{},"Apply filters at read time (",[627,704,705],{},"level",", ",[627,708,709],{},"since",[627,711,712],{},"until",", custom ",[627,715,716],{},"filter"," predicate) instead of post-processing",[667,719,720],{},"Treat malformed lines as silently skipped (partial writes happen), and never crash the script on a bad line",[618,722,723,724],{},"Docs: ",[622,725,726],{"href":726,"rel":727},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[728],"nofollow",[730,731,733],"h2",{"id":732},"replay-history","Replay history",[735,736,741],"pre",{"className":737,"code":738,"language":739,"meta":740,"style":740},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { readFsLogs } from 'evlog\u002Ffs'\n\nfor await (const event of readFsLogs({ since: '2026-03-01', level: 'error' })) {\n  console.log(event.timestamp, event.action ?? event.message)\n}\n","ts","",[627,742,743,775,782,851,896],{"__ignoreMap":740},[744,745,748,752,756,760,763,766,769,772],"span",{"class":746,"line":747},"line",1,[744,749,751],{"class":750},"s7zQu","import",[744,753,755],{"class":754},"sMK4o"," {",[744,757,759],{"class":758},"sTEyZ"," readFsLogs",[744,761,762],{"class":754}," }",[744,764,765],{"class":750}," from",[744,767,768],{"class":754}," '",[744,770,645],{"class":771},"sfazB",[744,773,774],{"class":754},"'\n",[744,776,778],{"class":746,"line":777},2,[744,779,781],{"emptyLinePlaceholder":780},true,"\n",[744,783,785,788,791,794,798,801,804,807,810,813,817,820,822,825,828,831,834,836,838,841,843,845,848],{"class":746,"line":784},3,[744,786,787],{"class":750},"for",[744,789,790],{"class":750}," await",[744,792,793],{"class":758}," (",[744,795,797],{"class":796},"spNyl","const",[744,799,800],{"class":758}," event ",[744,802,803],{"class":754},"of",[744,805,759],{"class":806},"s2Zo4",[744,808,809],{"class":758},"(",[744,811,812],{"class":754},"{",[744,814,816],{"class":815},"swJcz"," since",[744,818,819],{"class":754},":",[744,821,768],{"class":754},[744,823,824],{"class":771},"2026-03-01",[744,826,827],{"class":754},"'",[744,829,830],{"class":754},",",[744,832,833],{"class":815}," level",[744,835,819],{"class":754},[744,837,768],{"class":754},[744,839,840],{"class":771},"error",[744,842,827],{"class":754},[744,844,762],{"class":754},[744,846,847],{"class":758},")) ",[744,849,850],{"class":754},"{\n",[744,852,854,857,860,863,865,868,870,873,875,878,880,883,886,888,890,893],{"class":746,"line":853},4,[744,855,856],{"class":758},"  console",[744,858,859],{"class":754},".",[744,861,862],{"class":806},"log",[744,864,809],{"class":815},[744,866,867],{"class":758},"event",[744,869,859],{"class":754},[744,871,872],{"class":758},"timestamp",[744,874,830],{"class":754},[744,876,877],{"class":758}," event",[744,879,859],{"class":754},[744,881,882],{"class":758},"action",[744,884,885],{"class":754}," ??",[744,887,877],{"class":758},[744,889,859],{"class":754},[744,891,892],{"class":758},"message",[744,894,895],{"class":815},")\n",[744,897,899],{"class":746,"line":898},5,[744,900,901],{"class":754},"}\n",[618,903,904,907],{},[627,905,906],{},"readFsLogs(options)"," walks the NDJSON files in chronological order, parses them line by line, and yields events that pass all filters. Files outside the date window are skipped entirely.",[909,910,356],"h3",{"id":911},"options",[913,914,915,931],"table",{},[916,917,918],"thead",{},[919,920,921,925,928],"tr",{},[922,923,924],"th",{},"Option",[922,926,927],{},"Type",[922,929,930],{},"Description",[932,933,934,953,970,985,999],"tbody",{},[919,935,936,942,947],{},[937,938,939],"td",{},[627,940,941],{},"dir",[937,943,944],{},[627,945,946],{},"string",[937,948,949,950,859],{},"Directory to read from. Default: ",[627,951,952],{},".evlog\u002Flogs",[919,954,955,959,964],{},[937,956,957],{},[627,958,709],{},[937,960,961],{},[627,962,963],{},"Date | string",[937,965,966,967,859],{},"Yield events with ",[627,968,969],{},"timestamp >= since",[919,971,972,976,980],{},[937,973,974],{},[627,975,712],{},[937,977,978],{},[627,979,963],{},[937,981,966,982,859],{},[627,983,984],{},"timestamp \u003C= until",[919,986,987,991,996],{},[937,988,989],{},[627,990,705],{},[937,992,993],{},[627,994,995],{},"LogLevel | LogLevel[]",[937,997,998],{},"Filter by event level.",[919,1000,1001,1005,1010],{},[937,1002,1003],{},[627,1004,716],{},[937,1006,1007],{},[627,1008,1009],{},"(event) => boolean",[937,1011,1012],{},"Custom predicate.",[618,1014,1015],{},"Malformed lines (partial writes, manual edits) are silently skipped, so your script never crashes on a bad line.",[730,1017,1019],{"id":1018},"live-tail","Live tail",[735,1021,1023],{"className":737,"code":1022,"language":739,"meta":740,"style":740},"import { tailFsLogs } from 'evlog\u002Ffs'\n\nconst ac = new AbortController()\nprocess.on('SIGINT', () => ac.abort())\n\nfor await (const event of tailFsLogs({ signal: ac.signal })) {\n  console.log('live:', event.action ?? event.message)\n}\n",[627,1024,1025,1044,1048,1067,1105,1109,1149,1185],{"__ignoreMap":740},[744,1026,1027,1029,1031,1034,1036,1038,1040,1042],{"class":746,"line":747},[744,1028,751],{"class":750},[744,1030,755],{"class":754},[744,1032,1033],{"class":758}," tailFsLogs",[744,1035,762],{"class":754},[744,1037,765],{"class":750},[744,1039,768],{"class":754},[744,1041,645],{"class":771},[744,1043,774],{"class":754},[744,1045,1046],{"class":746,"line":777},[744,1047,781],{"emptyLinePlaceholder":780},[744,1049,1050,1052,1055,1058,1061,1064],{"class":746,"line":784},[744,1051,797],{"class":796},[744,1053,1054],{"class":758}," ac ",[744,1056,1057],{"class":754},"=",[744,1059,1060],{"class":754}," new",[744,1062,1063],{"class":806}," AbortController",[744,1065,1066],{"class":758},"()\n",[744,1068,1069,1072,1074,1077,1079,1081,1084,1086,1088,1091,1094,1097,1099,1102],{"class":746,"line":853},[744,1070,1071],{"class":758},"process",[744,1073,859],{"class":754},[744,1075,1076],{"class":806},"on",[744,1078,809],{"class":758},[744,1080,827],{"class":754},[744,1082,1083],{"class":771},"SIGINT",[744,1085,827],{"class":754},[744,1087,830],{"class":754},[744,1089,1090],{"class":754}," ()",[744,1092,1093],{"class":796}," =>",[744,1095,1096],{"class":758}," ac",[744,1098,859],{"class":754},[744,1100,1101],{"class":806},"abort",[744,1103,1104],{"class":758},"())\n",[744,1106,1107],{"class":746,"line":898},[744,1108,781],{"emptyLinePlaceholder":780},[744,1110,1112,1114,1116,1118,1120,1122,1124,1126,1128,1130,1133,1135,1137,1139,1142,1145,1147],{"class":746,"line":1111},6,[744,1113,787],{"class":750},[744,1115,790],{"class":750},[744,1117,793],{"class":758},[744,1119,797],{"class":796},[744,1121,800],{"class":758},[744,1123,803],{"class":754},[744,1125,1033],{"class":806},[744,1127,809],{"class":758},[744,1129,812],{"class":754},[744,1131,1132],{"class":815}," signal",[744,1134,819],{"class":754},[744,1136,1096],{"class":758},[744,1138,859],{"class":754},[744,1140,1141],{"class":758},"signal ",[744,1143,1144],{"class":754},"}",[744,1146,847],{"class":758},[744,1148,850],{"class":754},[744,1150,1152,1154,1156,1158,1160,1162,1165,1167,1169,1171,1173,1175,1177,1179,1181,1183],{"class":746,"line":1151},7,[744,1153,856],{"class":758},[744,1155,859],{"class":754},[744,1157,862],{"class":806},[744,1159,809],{"class":815},[744,1161,827],{"class":754},[744,1163,1164],{"class":771},"live:",[744,1166,827],{"class":754},[744,1168,830],{"class":754},[744,1170,877],{"class":758},[744,1172,859],{"class":754},[744,1174,882],{"class":758},[744,1176,885],{"class":754},[744,1178,877],{"class":758},[744,1180,859],{"class":754},[744,1182,892],{"class":758},[744,1184,895],{"class":815},[744,1186,1188],{"class":746,"line":1187},8,[744,1189,901],{"class":754},[618,1191,1192,1195,1196,1199],{},[627,1193,1194],{},"tailFsLogs(options)"," first yields existing events (unless ",[627,1197,1198],{},"fromEnd: true","), then keeps yielding new ones as they're appended, including events written into newly created daily files. Partial writes split across polls are recombined transparently.",[909,1201,1203],{"id":1202},"tail-specific-options","Tail-specific options",[913,1205,1206,1216],{},[916,1207,1208],{},[919,1209,1210,1212,1214],{},[922,1211,924],{},[922,1213,927],{},[922,1215,930],{},[932,1217,1218,1233,1248],{},[919,1219,1220,1225,1230],{},[937,1221,1222],{},[627,1223,1224],{},"pollIntervalMs",[937,1226,1227],{},[627,1228,1229],{},"number",[937,1231,1232],{},"Polling interval. Default: 500ms (minimum 50ms).",[919,1234,1235,1240,1245],{},[937,1236,1237],{},[627,1238,1239],{},"fromEnd",[937,1241,1242],{},[627,1243,1244],{},"boolean",[937,1246,1247],{},"Skip existing events; only yield future ones. Default: false.",[919,1249,1250,1255,1259],{},[937,1251,1252],{},[627,1253,1254],{},"signal",[937,1256,1257],{},[627,1258,699],{},[937,1260,1261],{},"Stop tailing when aborted.",[618,1263,1264,1265,1270],{},"All ",[622,1266,1268],{"href":1267},"#options",[627,1269,682],{}," options also apply.",[730,1272,1274],{"id":1273},"use-cases","Use cases",[664,1276,1277,1283,1286,1296],{},[667,1278,1279,1280,1282],{},"A local Electron \u002F Tauri dashboard reading ",[627,1281,633],{}," from a target project directory",[667,1284,1285],{},"A CI report aggregator that scans logs after a test run",[667,1287,1288,1289,1292,1293],{},"A ",[627,1290,1291],{},"grep","-style CLI that pipes filtered events into ",[627,1294,1295],{},"jq",[667,1297,1298,1299],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[622,1300,1302],{"href":1301},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1304,1305,1306],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"title":740,"searchDepth":777,"depth":777,"links":1308},[1309,1312,1315],{"id":732,"depth":777,"text":733,"children":1310},[1311],{"id":911,"depth":784,"text":356},{"id":1018,"depth":777,"text":1019,"children":1313},[1314],{"id":1202,"depth":784,"text":1203},{"id":1273,"depth":777,"text":1274},"Replay and tail the local NDJSON drain with readFsLogs and tailFsLogs — works in-process or from any external Node tool, survives restarts.","md",null,{},{"title":513,"icon":516},{"title":513,"description":1316},"R4g1MMNweLy_HA56RMBi-WG1D7Jb4XHOLc2nDmDbp2A",[1324,1326],{"title":509,"path":510,"stem":511,"description":1325,"icon":502,"children":-1},"Publish every wide event on a node:diagnostics_channel, so a consumer subscribes without importing evlog and Cloudflare can Tail Worker it.",{"title":425,"path":518,"stem":519,"description":1327,"icon":520,"children":-1},"Concrete copy-paste recipes — build your own minimal devtool, pipe to curl + jq, replay history then go live, and aggregate on the consumer side.",1791705355981]