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It watches for new lines, handles rotation, and accepts an ",[553,624,625],{},"AbortSignal",[593,627,628,629,632,633,632,636,639,640,643],{},"Apply filters at read time (",[553,630,631],{},"level",", ",[553,634,635],{},"since",[553,637,638],{},"until",", custom ",[553,641,642],{},"filter"," predicate) instead of post-processing",[593,645,646],{},"Treat malformed lines as silently skipped (partial writes happen), and never crash the script on a bad line",[544,648,649,650],{},"Docs: ",[548,651,652],{"href":652,"rel":653},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[654],"nofollow",[656,657,659],"h2",{"id":658},"replay-history","Replay history",[661,662,667],"pre",{"className":663,"code":664,"language":665,"meta":666,"style":666},"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","",[553,668,669,701,708,777,822],{"__ignoreMap":666},[670,671,674,678,682,686,689,692,695,698],"span",{"class":672,"line":673},"line",1,[670,675,677],{"class":676},"s7zQu","import",[670,679,681],{"class":680},"sMK4o"," {",[670,683,685],{"class":684},"sTEyZ"," readFsLogs",[670,687,688],{"class":680}," }",[670,690,691],{"class":676}," from",[670,693,694],{"class":680}," '",[670,696,571],{"class":697},"sfazB",[670,699,700],{"class":680},"'\n",[670,702,704],{"class":672,"line":703},2,[670,705,707],{"emptyLinePlaceholder":706},true,"\n",[670,709,711,714,717,720,724,727,730,733,736,739,743,746,748,751,754,757,760,762,764,767,769,771,774],{"class":672,"line":710},3,[670,712,713],{"class":676},"for",[670,715,716],{"class":676}," await",[670,718,719],{"class":684}," (",[670,721,723],{"class":722},"spNyl","const",[670,725,726],{"class":684}," event ",[670,728,729],{"class":680},"of",[670,731,685],{"class":732},"s2Zo4",[670,734,735],{"class":684},"(",[670,737,738],{"class":680},"{",[670,740,742],{"class":741},"swJcz"," since",[670,744,745],{"class":680},":",[670,747,694],{"class":680},[670,749,750],{"class":697},"2026-03-01",[670,752,753],{"class":680},"'",[670,755,756],{"class":680},",",[670,758,759],{"class":741}," level",[670,761,745],{"class":680},[670,763,694],{"class":680},[670,765,766],{"class":697},"error",[670,768,753],{"class":680},[670,770,688],{"class":680},[670,772,773],{"class":684},")) ",[670,775,776],{"class":680},"{\n",[670,778,780,783,786,789,791,794,796,799,801,804,806,809,812,814,816,819],{"class":672,"line":779},4,[670,781,782],{"class":684},"  console",[670,784,785],{"class":680},".",[670,787,788],{"class":732},"log",[670,790,735],{"class":741},[670,792,793],{"class":684},"event",[670,795,785],{"class":680},[670,797,798],{"class":684},"timestamp",[670,800,756],{"class":680},[670,802,803],{"class":684}," event",[670,805,785],{"class":680},[670,807,808],{"class":684},"action",[670,810,811],{"class":680}," ??",[670,813,803],{"class":684},[670,815,785],{"class":680},[670,817,818],{"class":684},"message",[670,820,821],{"class":741},")\n",[670,823,825],{"class":672,"line":824},5,[670,826,827],{"class":680},"}\n",[544,829,830,833],{},[553,831,832],{},"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.",[835,836,336],"h3",{"id":837},"options",[839,840,841,857],"table",{},[842,843,844],"thead",{},[845,846,847,851,854],"tr",{},[848,849,850],"th",{},"Option",[848,852,853],{},"Type",[848,855,856],{},"Description",[858,859,860,879,896,911,925],"tbody",{},[845,861,862,868,873],{},[863,864,865],"td",{},[553,866,867],{},"dir",[863,869,870],{},[553,871,872],{},"string",[863,874,875,876,785],{},"Directory to read from. Default: ",[553,877,878],{},".evlog\u002Flogs",[845,880,881,885,890],{},[863,882,883],{},[553,884,635],{},[863,886,887],{},[553,888,889],{},"Date | string",[863,891,892,893,785],{},"Yield events with ",[553,894,895],{},"timestamp >= since",[845,897,898,902,906],{},[863,899,900],{},[553,901,638],{},[863,903,904],{},[553,905,889],{},[863,907,892,908,785],{},[553,909,910],{},"timestamp \u003C= until",[845,912,913,917,922],{},[863,914,915],{},[553,916,631],{},[863,918,919],{},[553,920,921],{},"LogLevel | LogLevel[]",[863,923,924],{},"Filter by event level.",[845,926,927,931,936],{},[863,928,929],{},[553,930,642],{},[863,932,933],{},[553,934,935],{},"(event) => boolean",[863,937,938],{},"Custom predicate.",[544,940,941],{},"Malformed lines (partial writes, manual edits) are silently skipped, so your script never crashes on a bad line.",[656,943,945],{"id":944},"live-tail","Live tail",[661,947,949],{"className":663,"code":948,"language":665,"meta":666,"style":666},"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",[553,950,951,970,974,993,1031,1035,1075,1111],{"__ignoreMap":666},[670,952,953,955,957,960,962,964,966,968],{"class":672,"line":673},[670,954,677],{"class":676},[670,956,681],{"class":680},[670,958,959],{"class":684}," tailFsLogs",[670,961,688],{"class":680},[670,963,691],{"class":676},[670,965,694],{"class":680},[670,967,571],{"class":697},[670,969,700],{"class":680},[670,971,972],{"class":672,"line":703},[670,973,707],{"emptyLinePlaceholder":706},[670,975,976,978,981,984,987,990],{"class":672,"line":710},[670,977,723],{"class":722},[670,979,980],{"class":684}," ac ",[670,982,983],{"class":680},"=",[670,985,986],{"class":680}," new",[670,988,989],{"class":732}," AbortController",[670,991,992],{"class":684},"()\n",[670,994,995,998,1000,1003,1005,1007,1010,1012,1014,1017,1020,1023,1025,1028],{"class":672,"line":779},[670,996,997],{"class":684},"process",[670,999,785],{"class":680},[670,1001,1002],{"class":732},"on",[670,1004,735],{"class":684},[670,1006,753],{"class":680},[670,1008,1009],{"class":697},"SIGINT",[670,1011,753],{"class":680},[670,1013,756],{"class":680},[670,1015,1016],{"class":680}," ()",[670,1018,1019],{"class":722}," =>",[670,1021,1022],{"class":684}," ac",[670,1024,785],{"class":680},[670,1026,1027],{"class":732},"abort",[670,1029,1030],{"class":684},"())\n",[670,1032,1033],{"class":672,"line":824},[670,1034,707],{"emptyLinePlaceholder":706},[670,1036,1038,1040,1042,1044,1046,1048,1050,1052,1054,1056,1059,1061,1063,1065,1068,1071,1073],{"class":672,"line":1037},6,[670,1039,713],{"class":676},[670,1041,716],{"class":676},[670,1043,719],{"class":684},[670,1045,723],{"class":722},[670,1047,726],{"class":684},[670,1049,729],{"class":680},[670,1051,959],{"class":732},[670,1053,735],{"class":684},[670,1055,738],{"class":680},[670,1057,1058],{"class":741}," signal",[670,1060,745],{"class":680},[670,1062,1022],{"class":684},[670,1064,785],{"class":680},[670,1066,1067],{"class":684},"signal ",[670,1069,1070],{"class":680},"}",[670,1072,773],{"class":684},[670,1074,776],{"class":680},[670,1076,1078,1080,1082,1084,1086,1088,1091,1093,1095,1097,1099,1101,1103,1105,1107,1109],{"class":672,"line":1077},7,[670,1079,782],{"class":684},[670,1081,785],{"class":680},[670,1083,788],{"class":732},[670,1085,735],{"class":741},[670,1087,753],{"class":680},[670,1089,1090],{"class":697},"live:",[670,1092,753],{"class":680},[670,1094,756],{"class":680},[670,1096,803],{"class":684},[670,1098,785],{"class":680},[670,1100,808],{"class":684},[670,1102,811],{"class":680},[670,1104,803],{"class":684},[670,1106,785],{"class":680},[670,1108,818],{"class":684},[670,1110,821],{"class":741},[670,1112,1114],{"class":672,"line":1113},8,[670,1115,827],{"class":680},[544,1117,1118,1121,1122,1125],{},[553,1119,1120],{},"tailFsLogs(options)"," first yields existing events (unless ",[553,1123,1124],{},"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.",[835,1127,1129],{"id":1128},"tail-specific-options","Tail-specific options",[839,1131,1132,1142],{},[842,1133,1134],{},[845,1135,1136,1138,1140],{},[848,1137,850],{},[848,1139,853],{},[848,1141,856],{},[858,1143,1144,1159,1174],{},[845,1145,1146,1151,1156],{},[863,1147,1148],{},[553,1149,1150],{},"pollIntervalMs",[863,1152,1153],{},[553,1154,1155],{},"number",[863,1157,1158],{},"Polling interval. Default: 500ms (minimum 50ms).",[845,1160,1161,1166,1171],{},[863,1162,1163],{},[553,1164,1165],{},"fromEnd",[863,1167,1168],{},[553,1169,1170],{},"boolean",[863,1172,1173],{},"Skip existing events; only yield future ones. Default: false.",[845,1175,1176,1181,1185],{},[863,1177,1178],{},[553,1179,1180],{},"signal",[863,1182,1183],{},[553,1184,625],{},[863,1186,1187],{},"Stop tailing when aborted.",[544,1189,1190,1191,1196],{},"All ",[548,1192,1194],{"href":1193},"#options",[553,1195,608],{}," options also apply.",[656,1198,1200],{"id":1199},"use-cases","Use cases",[590,1202,1203,1209,1212,1222],{},[593,1204,1205,1206,1208],{},"A local Electron \u002F Tauri dashboard reading ",[553,1207,559],{}," from a target project directory",[593,1210,1211],{},"A CI report aggregator that scans logs after a test run",[593,1213,1214,1215,1218,1219],{},"A ",[553,1216,1217],{},"grep","-style CLI that pipes filtered events into ",[553,1220,1221],{},"jq",[593,1223,1224,1225],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[548,1226,1228],{"href":1227},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1230,1231,1232],"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":666,"searchDepth":703,"depth":703,"links":1234},[1235,1238,1241],{"id":658,"depth":703,"text":659,"children":1236},[1237],{"id":837,"depth":710,"text":336},{"id":944,"depth":703,"text":945,"children":1239},[1240],{"id":1128,"depth":710,"text":1129},{"id":1199,"depth":703,"text":1200},"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":1242},"R4g1MMNweLy_HA56RMBi-WG1D7Jb4XHOLc2nDmDbp2A",[1250,1252],{"title":460,"path":461,"stem":462,"description":1251,"icon":453,"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":406,"path":469,"stem":470,"description":1253,"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.",1786817442065]