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The ",[530,547,548],{},"evlog\u002Ffs"," module also ships ",[551,552,553],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[556,557],"ndjson-tail",{},[559,560,563,566,624],"prompt",{":actions":561,"description":562,"icon":453},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[521,564,565],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[567,568,569,580,593,603,621],"ul",{},[570,571,572,573,575,576,579],"li",{},"Confirm the filesystem drain is wired up (",[530,574,548],{}," adapter writing NDJSON to ",[530,577,578],{},".evlog\u002Flogs\u002F*.jsonl",")",[570,581,582,583,586,587,589,590],{},"For replay: import ",[530,584,585],{},"readFsLogs"," from ",[530,588,548],{}," and iterate ",[530,591,592],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[570,594,595,596,599,600],{},"For follow mode: import ",[530,597,598],{},"tailFsLogs"," and iterate the same way — it watches for new lines, handles rotation, and accepts an ",[530,601,602],{},"AbortSignal",[570,604,605,606,609,610,609,613,616,617,620],{},"Apply filters at read time (",[530,607,608],{},"level",", ",[530,611,612],{},"since",[530,614,615],{},"until",", custom ",[530,618,619],{},"filter"," predicate) instead of post-processing",[570,622,623],{},"Treat malformed lines as silently skipped (partial writes happen) — never crash the script on a bad line",[521,625,626,627],{},"Docs: ",[525,628,629],{"href":629,"rel":630},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[631],"nofollow",[633,634,636],"h2",{"id":635},"replay-history","Replay history",[638,639,644],"pre",{"className":640,"code":641,"language":642,"meta":643,"style":643},"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","",[530,645,646,678,685,754,799],{"__ignoreMap":643},[647,648,651,655,659,663,666,669,672,675],"span",{"class":649,"line":650},"line",1,[647,652,654],{"class":653},"s7zQu","import",[647,656,658],{"class":657},"sMK4o"," {",[647,660,662],{"class":661},"sTEyZ"," readFsLogs",[647,664,665],{"class":657}," }",[647,667,668],{"class":653}," from",[647,670,671],{"class":657}," '",[647,673,548],{"class":674},"sfazB",[647,676,677],{"class":657},"'\n",[647,679,681],{"class":649,"line":680},2,[647,682,684],{"emptyLinePlaceholder":683},true,"\n",[647,686,688,691,694,697,701,704,707,710,713,716,720,723,725,728,731,734,737,739,741,744,746,748,751],{"class":649,"line":687},3,[647,689,690],{"class":653},"for",[647,692,693],{"class":653}," await",[647,695,696],{"class":661}," (",[647,698,700],{"class":699},"spNyl","const",[647,702,703],{"class":661}," event ",[647,705,706],{"class":657},"of",[647,708,662],{"class":709},"s2Zo4",[647,711,712],{"class":661},"(",[647,714,715],{"class":657},"{",[647,717,719],{"class":718},"swJcz"," since",[647,721,722],{"class":657},":",[647,724,671],{"class":657},[647,726,727],{"class":674},"2026-03-01",[647,729,730],{"class":657},"'",[647,732,733],{"class":657},",",[647,735,736],{"class":718}," level",[647,738,722],{"class":657},[647,740,671],{"class":657},[647,742,743],{"class":674},"error",[647,745,730],{"class":657},[647,747,665],{"class":657},[647,749,750],{"class":661},")) ",[647,752,753],{"class":657},"{\n",[647,755,757,760,763,766,768,771,773,776,778,781,783,786,789,791,793,796],{"class":649,"line":756},4,[647,758,759],{"class":661},"  console",[647,761,762],{"class":657},".",[647,764,765],{"class":709},"log",[647,767,712],{"class":718},[647,769,770],{"class":661},"event",[647,772,762],{"class":657},[647,774,775],{"class":661},"timestamp",[647,777,733],{"class":657},[647,779,780],{"class":661}," event",[647,782,762],{"class":657},[647,784,785],{"class":661},"action",[647,787,788],{"class":657}," ??",[647,790,780],{"class":661},[647,792,762],{"class":657},[647,794,795],{"class":661},"message",[647,797,798],{"class":718},")\n",[647,800,802],{"class":649,"line":801},5,[647,803,804],{"class":657},"}\n",[521,806,807,810],{},[530,808,809],{},"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.",[812,813,326],"h3",{"id":814},"options",[816,817,818,834],"table",{},[819,820,821],"thead",{},[822,823,824,828,831],"tr",{},[825,826,827],"th",{},"Option",[825,829,830],{},"Type",[825,832,833],{},"Description",[835,836,837,856,873,888,902],"tbody",{},[822,838,839,845,850],{},[840,841,842],"td",{},[530,843,844],{},"dir",[840,846,847],{},[530,848,849],{},"string",[840,851,852,853,762],{},"Directory to read from. Default: ",[530,854,855],{},".evlog\u002Flogs",[822,857,858,862,867],{},[840,859,860],{},[530,861,612],{},[840,863,864],{},[530,865,866],{},"Date | string",[840,868,869,870,762],{},"Yield events with ",[530,871,872],{},"timestamp >= since",[822,874,875,879,883],{},[840,876,877],{},[530,878,615],{},[840,880,881],{},[530,882,866],{},[840,884,869,885,762],{},[530,886,887],{},"timestamp \u003C= until",[822,889,890,894,899],{},[840,891,892],{},[530,893,608],{},[840,895,896],{},[530,897,898],{},"LogLevel | LogLevel[]",[840,900,901],{},"Filter by event level.",[822,903,904,908,913],{},[840,905,906],{},[530,907,619],{},[840,909,910],{},[530,911,912],{},"(event) => boolean",[840,914,915],{},"Custom predicate.",[521,917,918],{},"Malformed lines (partial writes, manual edits) are silently skipped — your script never crashes on a bad line.",[633,920,922],{"id":921},"live-tail","Live tail",[638,924,926],{"className":640,"code":925,"language":642,"meta":643,"style":643},"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",[530,927,928,947,951,970,1008,1012,1052,1088],{"__ignoreMap":643},[647,929,930,932,934,937,939,941,943,945],{"class":649,"line":650},[647,931,654],{"class":653},[647,933,658],{"class":657},[647,935,936],{"class":661}," tailFsLogs",[647,938,665],{"class":657},[647,940,668],{"class":653},[647,942,671],{"class":657},[647,944,548],{"class":674},[647,946,677],{"class":657},[647,948,949],{"class":649,"line":680},[647,950,684],{"emptyLinePlaceholder":683},[647,952,953,955,958,961,964,967],{"class":649,"line":687},[647,954,700],{"class":699},[647,956,957],{"class":661}," ac ",[647,959,960],{"class":657},"=",[647,962,963],{"class":657}," new",[647,965,966],{"class":709}," AbortController",[647,968,969],{"class":661},"()\n",[647,971,972,975,977,980,982,984,987,989,991,994,997,1000,1002,1005],{"class":649,"line":756},[647,973,974],{"class":661},"process",[647,976,762],{"class":657},[647,978,979],{"class":709},"on",[647,981,712],{"class":661},[647,983,730],{"class":657},[647,985,986],{"class":674},"SIGINT",[647,988,730],{"class":657},[647,990,733],{"class":657},[647,992,993],{"class":657}," ()",[647,995,996],{"class":699}," =>",[647,998,999],{"class":661}," ac",[647,1001,762],{"class":657},[647,1003,1004],{"class":709},"abort",[647,1006,1007],{"class":661},"())\n",[647,1009,1010],{"class":649,"line":801},[647,1011,684],{"emptyLinePlaceholder":683},[647,1013,1015,1017,1019,1021,1023,1025,1027,1029,1031,1033,1036,1038,1040,1042,1045,1048,1050],{"class":649,"line":1014},6,[647,1016,690],{"class":653},[647,1018,693],{"class":653},[647,1020,696],{"class":661},[647,1022,700],{"class":699},[647,1024,703],{"class":661},[647,1026,706],{"class":657},[647,1028,936],{"class":709},[647,1030,712],{"class":661},[647,1032,715],{"class":657},[647,1034,1035],{"class":718}," signal",[647,1037,722],{"class":657},[647,1039,999],{"class":661},[647,1041,762],{"class":657},[647,1043,1044],{"class":661},"signal ",[647,1046,1047],{"class":657},"}",[647,1049,750],{"class":661},[647,1051,753],{"class":657},[647,1053,1055,1057,1059,1061,1063,1065,1068,1070,1072,1074,1076,1078,1080,1082,1084,1086],{"class":649,"line":1054},7,[647,1056,759],{"class":661},[647,1058,762],{"class":657},[647,1060,765],{"class":709},[647,1062,712],{"class":718},[647,1064,730],{"class":657},[647,1066,1067],{"class":674},"live:",[647,1069,730],{"class":657},[647,1071,733],{"class":657},[647,1073,780],{"class":661},[647,1075,762],{"class":657},[647,1077,785],{"class":661},[647,1079,788],{"class":657},[647,1081,780],{"class":661},[647,1083,762],{"class":657},[647,1085,795],{"class":661},[647,1087,798],{"class":718},[647,1089,1091],{"class":649,"line":1090},8,[647,1092,804],{"class":657},[521,1094,1095,1098,1099,1102],{},[530,1096,1097],{},"tailFsLogs(options)"," first yields existing events (unless ",[530,1100,1101],{},"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.",[812,1104,1106],{"id":1105},"tail-specific-options","Tail-specific options",[816,1108,1109,1119],{},[819,1110,1111],{},[822,1112,1113,1115,1117],{},[825,1114,827],{},[825,1116,830],{},[825,1118,833],{},[835,1120,1121,1136,1151],{},[822,1122,1123,1128,1133],{},[840,1124,1125],{},[530,1126,1127],{},"pollIntervalMs",[840,1129,1130],{},[530,1131,1132],{},"number",[840,1134,1135],{},"Polling interval. Default: 500ms (minimum 50ms).",[822,1137,1138,1143,1148],{},[840,1139,1140],{},[530,1141,1142],{},"fromEnd",[840,1144,1145],{},[530,1146,1147],{},"boolean",[840,1149,1150],{},"Skip existing events; only yield future ones. Default: false.",[822,1152,1153,1158,1162],{},[840,1154,1155],{},[530,1156,1157],{},"signal",[840,1159,1160],{},[530,1161,602],{},[840,1163,1164],{},"Stop tailing when aborted.",[521,1166,1167,1168,1173],{},"All ",[525,1169,1171],{"href":1170},"#options",[530,1172,585],{}," options also apply.",[633,1175,1177],{"id":1176},"use-cases","Use cases",[567,1179,1180,1186,1189,1199],{},[570,1181,1182,1183,1185],{},"A local Electron \u002F Tauri dashboard reading ",[530,1184,536],{}," from a target project directory",[570,1187,1188],{},"A CI report aggregator that scans logs after a test run",[570,1190,1191,1192,1195,1196],{},"A ",[530,1193,1194],{},"grep","-style CLI that pipes filtered events into ",[530,1197,1198],{},"jq",[570,1200,1201,1202],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[525,1203,1205],{"href":1204},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1207,1208,1209],"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":643,"searchDepth":680,"depth":680,"links":1211},[1212,1215,1218],{"id":635,"depth":680,"text":636,"children":1213},[1214],{"id":814,"depth":687,"text":326},{"id":921,"depth":680,"text":922,"children":1216},[1217],{"id":1105,"depth":687,"text":1106},{"id":1176,"depth":680,"text":1177},"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":450,"icon":453},{"title":450,"description":1219},"hip7SEWxeeu5DMPk0t0UWw-70GfCvrAeqjgm7ysLBmE",[1227,1229],{"title":445,"path":446,"stem":447,"description":1228,"icon":448,"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":396,"path":455,"stem":456,"description":1230,"icon":457,"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.",1785610620282]