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The ",[563,568,569],{},"evlog\u002Ffs"," module also ships ",[572,573,574],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[577,578,580],"h2",{"id":579},"replay-history","Replay history",[582,583,588],"pre",{"className":584,"code":585,"language":586,"meta":587,"style":587},"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","",[563,589,590,622,629,698,743],{"__ignoreMap":587},[591,592,595,599,603,607,610,613,616,619],"span",{"class":593,"line":594},"line",1,[591,596,598],{"class":597},"s7zQu","import",[591,600,602],{"class":601},"sMK4o"," {",[591,604,606],{"class":605},"sTEyZ"," readFsLogs",[591,608,609],{"class":601}," }",[591,611,612],{"class":597}," from",[591,614,615],{"class":601}," '",[591,617,569],{"class":618},"sfazB",[591,620,621],{"class":601},"'\n",[591,623,625],{"class":593,"line":624},2,[591,626,628],{"emptyLinePlaceholder":627},true,"\n",[591,630,632,635,638,641,645,648,651,654,657,660,664,667,669,672,675,678,681,683,685,688,690,692,695],{"class":593,"line":631},3,[591,633,634],{"class":597},"for",[591,636,637],{"class":597}," await",[591,639,640],{"class":605}," (",[591,642,644],{"class":643},"spNyl","const",[591,646,647],{"class":605}," event ",[591,649,650],{"class":601},"of",[591,652,606],{"class":653},"s2Zo4",[591,655,656],{"class":605},"(",[591,658,659],{"class":601},"{",[591,661,663],{"class":662},"swJcz"," since",[591,665,666],{"class":601},":",[591,668,615],{"class":601},[591,670,671],{"class":618},"2026-03-01",[591,673,674],{"class":601},"'",[591,676,677],{"class":601},",",[591,679,680],{"class":662}," level",[591,682,666],{"class":601},[591,684,615],{"class":601},[591,686,687],{"class":618},"error",[591,689,674],{"class":601},[591,691,609],{"class":601},[591,693,694],{"class":605},")) ",[591,696,697],{"class":601},"{\n",[591,699,701,704,707,710,712,715,717,720,722,725,727,730,733,735,737,740],{"class":593,"line":700},4,[591,702,703],{"class":605},"  console",[591,705,706],{"class":601},".",[591,708,709],{"class":653},"log",[591,711,656],{"class":662},[591,713,714],{"class":605},"event",[591,716,706],{"class":601},[591,718,719],{"class":605},"timestamp",[591,721,677],{"class":601},[591,723,724],{"class":605}," event",[591,726,706],{"class":601},[591,728,729],{"class":605},"action",[591,731,732],{"class":601}," ??",[591,734,724],{"class":605},[591,736,706],{"class":601},[591,738,739],{"class":605},"message",[591,741,742],{"class":662},")\n",[591,744,746],{"class":593,"line":745},5,[591,747,748],{"class":601},"}\n",[554,750,751,754],{},[563,752,753],{},"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.",[756,757,85],"h3",{"id":758},"options",[760,761,762,778],"table",{},[763,764,765],"thead",{},[766,767,768,772,775],"tr",{},[769,770,771],"th",{},"Option",[769,773,774],{},"Type",[769,776,777],{},"Description",[779,780,781,800,818,834,849],"tbody",{},[766,782,783,789,794],{},[784,785,786],"td",{},[563,787,788],{},"dir",[784,790,791],{},[563,792,793],{},"string",[784,795,796,797,706],{},"Directory to read from. Default: ",[563,798,799],{},".evlog\u002Flogs",[766,801,802,807,812],{},[784,803,804],{},[563,805,806],{},"since",[784,808,809],{},[563,810,811],{},"Date | string",[784,813,814,815,706],{},"Yield events with ",[563,816,817],{},"timestamp >= since",[766,819,820,825,829],{},[784,821,822],{},[563,823,824],{},"until",[784,826,827],{},[563,828,811],{},[784,830,814,831,706],{},[563,832,833],{},"timestamp \u003C= until",[766,835,836,841,846],{},[784,837,838],{},[563,839,840],{},"level",[784,842,843],{},[563,844,845],{},"LogLevel | LogLevel[]",[784,847,848],{},"Filter by event level.",[766,850,851,856,861],{},[784,852,853],{},[563,854,855],{},"filter",[784,857,858],{},[563,859,860],{},"(event) => boolean",[784,862,863],{},"Custom predicate.",[554,865,866],{},"Malformed lines (partial writes, manual edits) are silently skipped — your script never crashes on a bad line.",[577,868,870],{"id":869},"live-tail","Live tail",[582,872,874],{"className":584,"code":873,"language":586,"meta":587,"style":587},"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",[563,875,876,895,899,918,956,960,1000,1036],{"__ignoreMap":587},[591,877,878,880,882,885,887,889,891,893],{"class":593,"line":594},[591,879,598],{"class":597},[591,881,602],{"class":601},[591,883,884],{"class":605}," tailFsLogs",[591,886,609],{"class":601},[591,888,612],{"class":597},[591,890,615],{"class":601},[591,892,569],{"class":618},[591,894,621],{"class":601},[591,896,897],{"class":593,"line":624},[591,898,628],{"emptyLinePlaceholder":627},[591,900,901,903,906,909,912,915],{"class":593,"line":631},[591,902,644],{"class":643},[591,904,905],{"class":605}," ac ",[591,907,908],{"class":601},"=",[591,910,911],{"class":601}," new",[591,913,914],{"class":653}," AbortController",[591,916,917],{"class":605},"()\n",[591,919,920,923,925,928,930,932,935,937,939,942,945,948,950,953],{"class":593,"line":700},[591,921,922],{"class":605},"process",[591,924,706],{"class":601},[591,926,927],{"class":653},"on",[591,929,656],{"class":605},[591,931,674],{"class":601},[591,933,934],{"class":618},"SIGINT",[591,936,674],{"class":601},[591,938,677],{"class":601},[591,940,941],{"class":601}," ()",[591,943,944],{"class":643}," =>",[591,946,947],{"class":605}," ac",[591,949,706],{"class":601},[591,951,952],{"class":653},"abort",[591,954,955],{"class":605},"())\n",[591,957,958],{"class":593,"line":745},[591,959,628],{"emptyLinePlaceholder":627},[591,961,963,965,967,969,971,973,975,977,979,981,984,986,988,990,993,996,998],{"class":593,"line":962},6,[591,964,634],{"class":597},[591,966,637],{"class":597},[591,968,640],{"class":605},[591,970,644],{"class":643},[591,972,647],{"class":605},[591,974,650],{"class":601},[591,976,884],{"class":653},[591,978,656],{"class":605},[591,980,659],{"class":601},[591,982,983],{"class":662}," signal",[591,985,666],{"class":601},[591,987,947],{"class":605},[591,989,706],{"class":601},[591,991,992],{"class":605},"signal ",[591,994,995],{"class":601},"}",[591,997,694],{"class":605},[591,999,697],{"class":601},[591,1001,1003,1005,1007,1009,1011,1013,1016,1018,1020,1022,1024,1026,1028,1030,1032,1034],{"class":593,"line":1002},7,[591,1004,703],{"class":605},[591,1006,706],{"class":601},[591,1008,709],{"class":653},[591,1010,656],{"class":662},[591,1012,674],{"class":601},[591,1014,1015],{"class":618},"live:",[591,1017,674],{"class":601},[591,1019,677],{"class":601},[591,1021,724],{"class":605},[591,1023,706],{"class":601},[591,1025,729],{"class":605},[591,1027,732],{"class":601},[591,1029,724],{"class":605},[591,1031,706],{"class":601},[591,1033,739],{"class":605},[591,1035,742],{"class":662},[591,1037,1039],{"class":593,"line":1038},8,[591,1040,748],{"class":601},[554,1042,1043,1046,1047,1050],{},[563,1044,1045],{},"tailFsLogs(options)"," first yields existing events (unless ",[563,1048,1049],{},"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.",[756,1052,1054],{"id":1053},"tail-specific-options","Tail-specific options",[760,1056,1057,1067],{},[763,1058,1059],{},[766,1060,1061,1063,1065],{},[769,1062,771],{},[769,1064,774],{},[769,1066,777],{},[779,1068,1069,1084,1099],{},[766,1070,1071,1076,1081],{},[784,1072,1073],{},[563,1074,1075],{},"pollIntervalMs",[784,1077,1078],{},[563,1079,1080],{},"number",[784,1082,1083],{},"Polling interval. Default: 500ms (minimum 50ms).",[766,1085,1086,1091,1096],{},[784,1087,1088],{},[563,1089,1090],{},"fromEnd",[784,1092,1093],{},[563,1094,1095],{},"boolean",[784,1097,1098],{},"Skip existing events; only yield future ones. Default: false.",[766,1100,1101,1106,1111],{},[784,1102,1103],{},[563,1104,1105],{},"signal",[784,1107,1108],{},[563,1109,1110],{},"AbortSignal",[784,1112,1113],{},"Stop tailing when aborted.",[554,1115,1116,1117,1123],{},"All ",[558,1118,1120],{"href":1119},"#options",[563,1121,1122],{},"readFsLogs"," options also apply.",[577,1125,1127],{"id":1126},"use-cases","Use cases",[1129,1130,1131,1138,1141,1151],"ul",{},[1132,1133,1134,1135,1137],"li",{},"A local Electron \u002F Tauri dashboard reading ",[563,1136,565],{}," from a target project directory.",[1132,1139,1140],{},"A CI report aggregator that scans logs after a test run.",[1132,1142,1143,1144,1147,1148,706],{},"A ",[563,1145,1146],{},"grep","-style CLI that pipes filtered events into ",[563,1149,1150],{},"jq",[1132,1152,1153,1154,706],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[558,1155,1157],{"href":1156},"\u002Fbuild-on-top\u002Fobservers\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1159,1160,1161],"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":587,"searchDepth":624,"depth":624,"links":1163},[1164,1167,1170],{"id":579,"depth":624,"text":580,"children":1165},[1166],{"id":758,"depth":631,"text":85},{"id":869,"depth":624,"text":870,"children":1168},[1169],{"id":1053,"depth":631,"text":1054},{"id":1126,"depth":624,"text":1127},"Replay and tail the local NDJSON drain with readFsLogs and tailFsLogs — works in-process or from any external Node tool.","md",null,{},{"title":317,"icon":320},{"title":549,"description":1171},"9USYxSUjNqoGXwV3LtBXaJbAxkFJnkOiquKi5KNZylc",[1179,1181],{"title":312,"path":313,"stem":314,"description":1180,"icon":315,"children":-1},"A local HTTP mini-server on its own port that exposes the in-process stream over Server-Sent Events. Strict opt-in, framework-agnostic, no app route to wire.",{"title":156,"path":322,"stem":323,"description":1182,"icon":324,"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.",1778338249299]