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The ",[549,566,567],{},"evlog\u002Ffs"," module also ships ",[570,571,572],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[575,576],"ndjson-tail",{},[578,579,582,585,643],"prompt",{":actions":580,"description":581,"icon":467},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[540,583,584],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[586,587,588,599,612,622,640],"ul",{},[589,590,591,592,594,595,598],"li",{},"Confirm the filesystem drain is wired up (",[549,593,567],{}," adapter writing NDJSON to ",[549,596,597],{},".evlog\u002Flogs\u002F*.jsonl",")",[589,600,601,602,605,606,608,609],{},"For replay: import ",[549,603,604],{},"readFsLogs"," from ",[549,607,567],{}," and iterate ",[549,610,611],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[589,613,614,615,618,619],{},"For follow mode: import ",[549,616,617],{},"tailFsLogs"," and iterate the same way — it watches for new lines, handles rotation, and accepts an ",[549,620,621],{},"AbortSignal",[589,623,624,625,628,629,628,632,635,636,639],{},"Apply filters at read time (",[549,626,627],{},"level",", ",[549,630,631],{},"since",[549,633,634],{},"until",", custom ",[549,637,638],{},"filter"," predicate) instead of post-processing",[589,641,642],{},"Treat malformed lines as silently skipped (partial writes happen) — never crash the script on a bad line",[540,644,645,646],{},"Docs: ",[544,647,648],{"href":648,"rel":649},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[650],"nofollow",[652,653,655],"h2",{"id":654},"replay-history","Replay history",[657,658,663],"pre",{"className":659,"code":660,"language":661,"meta":662,"style":662},"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","",[549,664,665,697,704,773,818],{"__ignoreMap":662},[666,667,670,674,678,682,685,688,691,694],"span",{"class":668,"line":669},"line",1,[666,671,673],{"class":672},"s7zQu","import",[666,675,677],{"class":676},"sMK4o"," {",[666,679,681],{"class":680},"sTEyZ"," readFsLogs",[666,683,684],{"class":676}," }",[666,686,687],{"class":672}," from",[666,689,690],{"class":676}," '",[666,692,567],{"class":693},"sfazB",[666,695,696],{"class":676},"'\n",[666,698,700],{"class":668,"line":699},2,[666,701,703],{"emptyLinePlaceholder":702},true,"\n",[666,705,707,710,713,716,720,723,726,729,732,735,739,742,744,747,750,753,756,758,760,763,765,767,770],{"class":668,"line":706},3,[666,708,709],{"class":672},"for",[666,711,712],{"class":672}," await",[666,714,715],{"class":680}," (",[666,717,719],{"class":718},"spNyl","const",[666,721,722],{"class":680}," event ",[666,724,725],{"class":676},"of",[666,727,681],{"class":728},"s2Zo4",[666,730,731],{"class":680},"(",[666,733,734],{"class":676},"{",[666,736,738],{"class":737},"swJcz"," since",[666,740,741],{"class":676},":",[666,743,690],{"class":676},[666,745,746],{"class":693},"2026-03-01",[666,748,749],{"class":676},"'",[666,751,752],{"class":676},",",[666,754,755],{"class":737}," level",[666,757,741],{"class":676},[666,759,690],{"class":676},[666,761,762],{"class":693},"error",[666,764,749],{"class":676},[666,766,684],{"class":676},[666,768,769],{"class":680},")) ",[666,771,772],{"class":676},"{\n",[666,774,776,779,782,785,787,790,792,795,797,800,802,805,808,810,812,815],{"class":668,"line":775},4,[666,777,778],{"class":680},"  console",[666,780,781],{"class":676},".",[666,783,784],{"class":728},"log",[666,786,731],{"class":737},[666,788,789],{"class":680},"event",[666,791,781],{"class":676},[666,793,794],{"class":680},"timestamp",[666,796,752],{"class":676},[666,798,799],{"class":680}," event",[666,801,781],{"class":676},[666,803,804],{"class":680},"action",[666,806,807],{"class":676}," ??",[666,809,799],{"class":680},[666,811,781],{"class":676},[666,813,814],{"class":680},"message",[666,816,817],{"class":737},")\n",[666,819,821],{"class":668,"line":820},5,[666,822,823],{"class":676},"}\n",[540,825,826,829],{},[549,827,828],{},"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.",[831,832,336],"h3",{"id":833},"options",[835,836,837,853],"table",{},[838,839,840],"thead",{},[841,842,843,847,850],"tr",{},[844,845,846],"th",{},"Option",[844,848,849],{},"Type",[844,851,852],{},"Description",[854,855,856,875,892,907,921],"tbody",{},[841,857,858,864,869],{},[859,860,861],"td",{},[549,862,863],{},"dir",[859,865,866],{},[549,867,868],{},"string",[859,870,871,872,781],{},"Directory to read from. Default: ",[549,873,874],{},".evlog\u002Flogs",[841,876,877,881,886],{},[859,878,879],{},[549,880,631],{},[859,882,883],{},[549,884,885],{},"Date | string",[859,887,888,889,781],{},"Yield events with ",[549,890,891],{},"timestamp >= since",[841,893,894,898,902],{},[859,895,896],{},[549,897,634],{},[859,899,900],{},[549,901,885],{},[859,903,888,904,781],{},[549,905,906],{},"timestamp \u003C= until",[841,908,909,913,918],{},[859,910,911],{},[549,912,627],{},[859,914,915],{},[549,916,917],{},"LogLevel | LogLevel[]",[859,919,920],{},"Filter by event level.",[841,922,923,927,932],{},[859,924,925],{},[549,926,638],{},[859,928,929],{},[549,930,931],{},"(event) => boolean",[859,933,934],{},"Custom predicate.",[540,936,937],{},"Malformed lines (partial writes, manual edits) are silently skipped — your script never crashes on a bad line.",[652,939,941],{"id":940},"live-tail","Live tail",[657,943,945],{"className":659,"code":944,"language":661,"meta":662,"style":662},"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",[549,946,947,966,970,989,1027,1031,1071,1107],{"__ignoreMap":662},[666,948,949,951,953,956,958,960,962,964],{"class":668,"line":669},[666,950,673],{"class":672},[666,952,677],{"class":676},[666,954,955],{"class":680}," tailFsLogs",[666,957,684],{"class":676},[666,959,687],{"class":672},[666,961,690],{"class":676},[666,963,567],{"class":693},[666,965,696],{"class":676},[666,967,968],{"class":668,"line":699},[666,969,703],{"emptyLinePlaceholder":702},[666,971,972,974,977,980,983,986],{"class":668,"line":706},[666,973,719],{"class":718},[666,975,976],{"class":680}," ac ",[666,978,979],{"class":676},"=",[666,981,982],{"class":676}," new",[666,984,985],{"class":728}," AbortController",[666,987,988],{"class":680},"()\n",[666,990,991,994,996,999,1001,1003,1006,1008,1010,1013,1016,1019,1021,1024],{"class":668,"line":775},[666,992,993],{"class":680},"process",[666,995,781],{"class":676},[666,997,998],{"class":728},"on",[666,1000,731],{"class":680},[666,1002,749],{"class":676},[666,1004,1005],{"class":693},"SIGINT",[666,1007,749],{"class":676},[666,1009,752],{"class":676},[666,1011,1012],{"class":676}," ()",[666,1014,1015],{"class":718}," =>",[666,1017,1018],{"class":680}," ac",[666,1020,781],{"class":676},[666,1022,1023],{"class":728},"abort",[666,1025,1026],{"class":680},"())\n",[666,1028,1029],{"class":668,"line":820},[666,1030,703],{"emptyLinePlaceholder":702},[666,1032,1034,1036,1038,1040,1042,1044,1046,1048,1050,1052,1055,1057,1059,1061,1064,1067,1069],{"class":668,"line":1033},6,[666,1035,709],{"class":672},[666,1037,712],{"class":672},[666,1039,715],{"class":680},[666,1041,719],{"class":718},[666,1043,722],{"class":680},[666,1045,725],{"class":676},[666,1047,955],{"class":728},[666,1049,731],{"class":680},[666,1051,734],{"class":676},[666,1053,1054],{"class":737}," signal",[666,1056,741],{"class":676},[666,1058,1018],{"class":680},[666,1060,781],{"class":676},[666,1062,1063],{"class":680},"signal ",[666,1065,1066],{"class":676},"}",[666,1068,769],{"class":680},[666,1070,772],{"class":676},[666,1072,1074,1076,1078,1080,1082,1084,1087,1089,1091,1093,1095,1097,1099,1101,1103,1105],{"class":668,"line":1073},7,[666,1075,778],{"class":680},[666,1077,781],{"class":676},[666,1079,784],{"class":728},[666,1081,731],{"class":737},[666,1083,749],{"class":676},[666,1085,1086],{"class":693},"live:",[666,1088,749],{"class":676},[666,1090,752],{"class":676},[666,1092,799],{"class":680},[666,1094,781],{"class":676},[666,1096,804],{"class":680},[666,1098,807],{"class":676},[666,1100,799],{"class":680},[666,1102,781],{"class":676},[666,1104,814],{"class":680},[666,1106,817],{"class":737},[666,1108,1110],{"class":668,"line":1109},8,[666,1111,823],{"class":676},[540,1113,1114,1117,1118,1121],{},[549,1115,1116],{},"tailFsLogs(options)"," first yields existing events (unless ",[549,1119,1120],{},"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.",[831,1123,1125],{"id":1124},"tail-specific-options","Tail-specific options",[835,1127,1128,1138],{},[838,1129,1130],{},[841,1131,1132,1134,1136],{},[844,1133,846],{},[844,1135,849],{},[844,1137,852],{},[854,1139,1140,1155,1170],{},[841,1141,1142,1147,1152],{},[859,1143,1144],{},[549,1145,1146],{},"pollIntervalMs",[859,1148,1149],{},[549,1150,1151],{},"number",[859,1153,1154],{},"Polling interval. Default: 500ms (minimum 50ms).",[841,1156,1157,1162,1167],{},[859,1158,1159],{},[549,1160,1161],{},"fromEnd",[859,1163,1164],{},[549,1165,1166],{},"boolean",[859,1168,1169],{},"Skip existing events; only yield future ones. Default: false.",[841,1171,1172,1177,1181],{},[859,1173,1174],{},[549,1175,1176],{},"signal",[859,1178,1179],{},[549,1180,621],{},[859,1182,1183],{},"Stop tailing when aborted.",[540,1185,1186,1187,1192],{},"All ",[544,1188,1190],{"href":1189},"#options",[549,1191,604],{}," options also apply.",[652,1194,1196],{"id":1195},"use-cases","Use cases",[586,1198,1199,1205,1208,1218],{},[589,1200,1201,1202,1204],{},"A local Electron \u002F Tauri dashboard reading ",[549,1203,555],{}," from a target project directory",[589,1206,1207],{},"A CI report aggregator that scans logs after a test run",[589,1209,1210,1211,1214,1215],{},"A ",[549,1212,1213],{},"grep","-style CLI that pipes filtered events into ",[549,1216,1217],{},"jq",[589,1219,1220,1221],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[544,1222,1224],{"href":1223},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1226,1227,1228],"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":662,"searchDepth":699,"depth":699,"links":1230},[1231,1234,1237],{"id":654,"depth":699,"text":655,"children":1232},[1233],{"id":833,"depth":706,"text":336},{"id":940,"depth":699,"text":941,"children":1235},[1236],{"id":1124,"depth":706,"text":1125},{"id":1195,"depth":699,"text":1196},"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":464,"icon":467},{"title":464,"description":1238},"hip7SEWxeeu5DMPk0t0UWw-70GfCvrAeqjgm7ysLBmE",[1246,1248],{"title":460,"path":461,"stem":462,"description":1247,"icon":453,"children":-1},"Publish every wide event on a node:diagnostics_channel so any consumer can subscribe without importing evlog — and so Cloudflare forwards them to a Tail Worker with no drain.",{"title":406,"path":469,"stem":470,"description":1249,"icon":471,"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.",1786743669595]