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The ",[540,557,558],{},"evlog\u002Ffs"," module also ships ",[561,562,563],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[566,567],"ndjson-tail",{},[569,570,573,576,634],"prompt",{":actions":571,"description":572,"icon":463},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[531,574,575],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[577,578,579,590,603,613,631],"ul",{},[580,581,582,583,585,586,589],"li",{},"Confirm the filesystem drain is wired up (",[540,584,558],{}," adapter writing NDJSON to ",[540,587,588],{},".evlog\u002Flogs\u002F*.jsonl",")",[580,591,592,593,596,597,599,600],{},"For replay: import ",[540,594,595],{},"readFsLogs"," from ",[540,598,558],{}," and iterate ",[540,601,602],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[580,604,605,606,609,610],{},"For follow mode: import ",[540,607,608],{},"tailFsLogs"," and iterate the same way — it watches for new lines, handles rotation, and accepts an ",[540,611,612],{},"AbortSignal",[580,614,615,616,619,620,619,623,626,627,630],{},"Apply filters at read time (",[540,617,618],{},"level",", ",[540,621,622],{},"since",[540,624,625],{},"until",", custom ",[540,628,629],{},"filter"," predicate) instead of post-processing",[580,632,633],{},"Treat malformed lines as silently skipped (partial writes happen) — never crash the script on a bad line",[531,635,636,637],{},"Docs: ",[535,638,639],{"href":639,"rel":640},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[641],"nofollow",[643,644,646],"h2",{"id":645},"replay-history","Replay history",[648,649,654],"pre",{"className":650,"code":651,"language":652,"meta":653,"style":653},"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","",[540,655,656,688,695,764,809],{"__ignoreMap":653},[657,658,661,665,669,673,676,679,682,685],"span",{"class":659,"line":660},"line",1,[657,662,664],{"class":663},"s7zQu","import",[657,666,668],{"class":667},"sMK4o"," {",[657,670,672],{"class":671},"sTEyZ"," readFsLogs",[657,674,675],{"class":667}," }",[657,677,678],{"class":663}," from",[657,680,681],{"class":667}," '",[657,683,558],{"class":684},"sfazB",[657,686,687],{"class":667},"'\n",[657,689,691],{"class":659,"line":690},2,[657,692,694],{"emptyLinePlaceholder":693},true,"\n",[657,696,698,701,704,707,711,714,717,720,723,726,730,733,735,738,741,744,747,749,751,754,756,758,761],{"class":659,"line":697},3,[657,699,700],{"class":663},"for",[657,702,703],{"class":663}," await",[657,705,706],{"class":671}," (",[657,708,710],{"class":709},"spNyl","const",[657,712,713],{"class":671}," event ",[657,715,716],{"class":667},"of",[657,718,672],{"class":719},"s2Zo4",[657,721,722],{"class":671},"(",[657,724,725],{"class":667},"{",[657,727,729],{"class":728},"swJcz"," since",[657,731,732],{"class":667},":",[657,734,681],{"class":667},[657,736,737],{"class":684},"2026-03-01",[657,739,740],{"class":667},"'",[657,742,743],{"class":667},",",[657,745,746],{"class":728}," level",[657,748,732],{"class":667},[657,750,681],{"class":667},[657,752,753],{"class":684},"error",[657,755,740],{"class":667},[657,757,675],{"class":667},[657,759,760],{"class":671},")) ",[657,762,763],{"class":667},"{\n",[657,765,767,770,773,776,778,781,783,786,788,791,793,796,799,801,803,806],{"class":659,"line":766},4,[657,768,769],{"class":671},"  console",[657,771,772],{"class":667},".",[657,774,775],{"class":719},"log",[657,777,722],{"class":728},[657,779,780],{"class":671},"event",[657,782,772],{"class":667},[657,784,785],{"class":671},"timestamp",[657,787,743],{"class":667},[657,789,790],{"class":671}," event",[657,792,772],{"class":667},[657,794,795],{"class":671},"action",[657,797,798],{"class":667}," ??",[657,800,790],{"class":671},[657,802,772],{"class":667},[657,804,805],{"class":671},"message",[657,807,808],{"class":728},")\n",[657,810,812],{"class":659,"line":811},5,[657,813,814],{"class":667},"}\n",[531,816,817,820],{},[540,818,819],{},"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.",[822,823,336],"h3",{"id":824},"options",[826,827,828,844],"table",{},[829,830,831],"thead",{},[832,833,834,838,841],"tr",{},[835,836,837],"th",{},"Option",[835,839,840],{},"Type",[835,842,843],{},"Description",[845,846,847,866,883,898,912],"tbody",{},[832,848,849,855,860],{},[850,851,852],"td",{},[540,853,854],{},"dir",[850,856,857],{},[540,858,859],{},"string",[850,861,862,863,772],{},"Directory to read from. Default: ",[540,864,865],{},".evlog\u002Flogs",[832,867,868,872,877],{},[850,869,870],{},[540,871,622],{},[850,873,874],{},[540,875,876],{},"Date | string",[850,878,879,880,772],{},"Yield events with ",[540,881,882],{},"timestamp >= since",[832,884,885,889,893],{},[850,886,887],{},[540,888,625],{},[850,890,891],{},[540,892,876],{},[850,894,879,895,772],{},[540,896,897],{},"timestamp \u003C= until",[832,899,900,904,909],{},[850,901,902],{},[540,903,618],{},[850,905,906],{},[540,907,908],{},"LogLevel | LogLevel[]",[850,910,911],{},"Filter by event level.",[832,913,914,918,923],{},[850,915,916],{},[540,917,629],{},[850,919,920],{},[540,921,922],{},"(event) => boolean",[850,924,925],{},"Custom predicate.",[531,927,928],{},"Malformed lines (partial writes, manual edits) are silently skipped — your script never crashes on a bad line.",[643,930,932],{"id":931},"live-tail","Live tail",[648,934,936],{"className":650,"code":935,"language":652,"meta":653,"style":653},"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",[540,937,938,957,961,980,1018,1022,1062,1098],{"__ignoreMap":653},[657,939,940,942,944,947,949,951,953,955],{"class":659,"line":660},[657,941,664],{"class":663},[657,943,668],{"class":667},[657,945,946],{"class":671}," tailFsLogs",[657,948,675],{"class":667},[657,950,678],{"class":663},[657,952,681],{"class":667},[657,954,558],{"class":684},[657,956,687],{"class":667},[657,958,959],{"class":659,"line":690},[657,960,694],{"emptyLinePlaceholder":693},[657,962,963,965,968,971,974,977],{"class":659,"line":697},[657,964,710],{"class":709},[657,966,967],{"class":671}," ac ",[657,969,970],{"class":667},"=",[657,972,973],{"class":667}," new",[657,975,976],{"class":719}," AbortController",[657,978,979],{"class":671},"()\n",[657,981,982,985,987,990,992,994,997,999,1001,1004,1007,1010,1012,1015],{"class":659,"line":766},[657,983,984],{"class":671},"process",[657,986,772],{"class":667},[657,988,989],{"class":719},"on",[657,991,722],{"class":671},[657,993,740],{"class":667},[657,995,996],{"class":684},"SIGINT",[657,998,740],{"class":667},[657,1000,743],{"class":667},[657,1002,1003],{"class":667}," ()",[657,1005,1006],{"class":709}," =>",[657,1008,1009],{"class":671}," ac",[657,1011,772],{"class":667},[657,1013,1014],{"class":719},"abort",[657,1016,1017],{"class":671},"())\n",[657,1019,1020],{"class":659,"line":811},[657,1021,694],{"emptyLinePlaceholder":693},[657,1023,1025,1027,1029,1031,1033,1035,1037,1039,1041,1043,1046,1048,1050,1052,1055,1058,1060],{"class":659,"line":1024},6,[657,1026,700],{"class":663},[657,1028,703],{"class":663},[657,1030,706],{"class":671},[657,1032,710],{"class":709},[657,1034,713],{"class":671},[657,1036,716],{"class":667},[657,1038,946],{"class":719},[657,1040,722],{"class":671},[657,1042,725],{"class":667},[657,1044,1045],{"class":728}," signal",[657,1047,732],{"class":667},[657,1049,1009],{"class":671},[657,1051,772],{"class":667},[657,1053,1054],{"class":671},"signal ",[657,1056,1057],{"class":667},"}",[657,1059,760],{"class":671},[657,1061,763],{"class":667},[657,1063,1065,1067,1069,1071,1073,1075,1078,1080,1082,1084,1086,1088,1090,1092,1094,1096],{"class":659,"line":1064},7,[657,1066,769],{"class":671},[657,1068,772],{"class":667},[657,1070,775],{"class":719},[657,1072,722],{"class":728},[657,1074,740],{"class":667},[657,1076,1077],{"class":684},"live:",[657,1079,740],{"class":667},[657,1081,743],{"class":667},[657,1083,790],{"class":671},[657,1085,772],{"class":667},[657,1087,795],{"class":671},[657,1089,798],{"class":667},[657,1091,790],{"class":671},[657,1093,772],{"class":667},[657,1095,805],{"class":671},[657,1097,808],{"class":728},[657,1099,1101],{"class":659,"line":1100},8,[657,1102,814],{"class":667},[531,1104,1105,1108,1109,1112],{},[540,1106,1107],{},"tailFsLogs(options)"," first yields existing events (unless ",[540,1110,1111],{},"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.",[822,1114,1116],{"id":1115},"tail-specific-options","Tail-specific options",[826,1118,1119,1129],{},[829,1120,1121],{},[832,1122,1123,1125,1127],{},[835,1124,837],{},[835,1126,840],{},[835,1128,843],{},[845,1130,1131,1146,1161],{},[832,1132,1133,1138,1143],{},[850,1134,1135],{},[540,1136,1137],{},"pollIntervalMs",[850,1139,1140],{},[540,1141,1142],{},"number",[850,1144,1145],{},"Polling interval. Default: 500ms (minimum 50ms).",[832,1147,1148,1153,1158],{},[850,1149,1150],{},[540,1151,1152],{},"fromEnd",[850,1154,1155],{},[540,1156,1157],{},"boolean",[850,1159,1160],{},"Skip existing events; only yield future ones. Default: false.",[832,1162,1163,1168,1172],{},[850,1164,1165],{},[540,1166,1167],{},"signal",[850,1169,1170],{},[540,1171,612],{},[850,1173,1174],{},"Stop tailing when aborted.",[531,1176,1177,1178,1183],{},"All ",[535,1179,1181],{"href":1180},"#options",[540,1182,595],{}," options also apply.",[643,1185,1187],{"id":1186},"use-cases","Use cases",[577,1189,1190,1196,1199,1209],{},[580,1191,1192,1193,1195],{},"A local Electron \u002F Tauri dashboard reading ",[540,1194,546],{}," from a target project directory",[580,1197,1198],{},"A CI report aggregator that scans logs after a test run",[580,1200,1201,1202,1205,1206],{},"A ",[540,1203,1204],{},"grep","-style CLI that pipes filtered events into ",[540,1207,1208],{},"jq",[580,1210,1211,1212],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[535,1213,1215],{"href":1214},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1217,1218,1219],"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":653,"searchDepth":690,"depth":690,"links":1221},[1222,1225,1228],{"id":645,"depth":690,"text":646,"children":1223},[1224],{"id":824,"depth":697,"text":336},{"id":931,"depth":690,"text":932,"children":1226},[1227],{"id":1115,"depth":697,"text":1116},{"id":1186,"depth":690,"text":1187},"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":460,"icon":463},{"title":460,"description":1229},"hip7SEWxeeu5DMPk0t0UWw-70GfCvrAeqjgm7ysLBmE",[1237,1239],{"title":455,"path":456,"stem":457,"description":1238,"icon":458,"children":-1},"Build evlog support for an HTTP framework (or non-HTTP runtime) without a built-in integration. Use defineFrameworkIntegration for the (ctx, next) middleware shape, or createMiddlewareLogger \u002F createRequestLogger for everything else.",{"title":406,"path":465,"stem":466,"description":1240,"icon":467,"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.",1785674486292]