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The ",[596,613,614],{},"evlog\u002Ffs"," module also ships ",[617,618,619],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[622,623],"ndjson-tail",{},[625,626,629,632,690],"prompt",{":actions":627,"description":628,"icon":485},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[587,630,631],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[633,634,635,646,659,669,687],"ul",{},[636,637,638,639,641,642,645],"li",{},"Confirm the filesystem drain is wired up (",[596,640,614],{}," adapter writing NDJSON to ",[596,643,644],{},".evlog\u002Flogs\u002F*.jsonl",")",[636,647,648,649,652,653,655,656],{},"For replay: import ",[596,650,651],{},"readFsLogs"," from ",[596,654,614],{}," and iterate ",[596,657,658],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[636,660,661,662,665,666],{},"For follow mode: import ",[596,663,664],{},"tailFsLogs"," and iterate the same way. It watches for new lines, handles rotation, and accepts an ",[596,667,668],{},"AbortSignal",[636,670,671,672,675,676,675,679,682,683,686],{},"Apply filters at read time (",[596,673,674],{},"level",", ",[596,677,678],{},"since",[596,680,681],{},"until",", custom ",[596,684,685],{},"filter"," predicate) instead of post-processing",[636,688,689],{},"Treat malformed lines as silently skipped (partial writes happen), and never crash the script on a bad line",[587,691,692,693],{},"Docs: ",[591,694,695],{"href":695,"rel":696},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[697],"nofollow",[699,700,702],"h2",{"id":701},"replay-history","Replay history",[704,705,710],"pre",{"className":706,"code":707,"language":708,"meta":709,"style":709},"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","",[596,711,712,744,751,820,865],{"__ignoreMap":709},[713,714,717,721,725,729,732,735,738,741],"span",{"class":715,"line":716},"line",1,[713,718,720],{"class":719},"s7zQu","import",[713,722,724],{"class":723},"sMK4o"," {",[713,726,728],{"class":727},"sTEyZ"," readFsLogs",[713,730,731],{"class":723}," }",[713,733,734],{"class":719}," from",[713,736,737],{"class":723}," '",[713,739,614],{"class":740},"sfazB",[713,742,743],{"class":723},"'\n",[713,745,747],{"class":715,"line":746},2,[713,748,750],{"emptyLinePlaceholder":749},true,"\n",[713,752,754,757,760,763,767,770,773,776,779,782,786,789,791,794,797,800,803,805,807,810,812,814,817],{"class":715,"line":753},3,[713,755,756],{"class":719},"for",[713,758,759],{"class":719}," await",[713,761,762],{"class":727}," (",[713,764,766],{"class":765},"spNyl","const",[713,768,769],{"class":727}," event ",[713,771,772],{"class":723},"of",[713,774,728],{"class":775},"s2Zo4",[713,777,778],{"class":727},"(",[713,780,781],{"class":723},"{",[713,783,785],{"class":784},"swJcz"," since",[713,787,788],{"class":723},":",[713,790,737],{"class":723},[713,792,793],{"class":740},"2026-03-01",[713,795,796],{"class":723},"'",[713,798,799],{"class":723},",",[713,801,802],{"class":784}," level",[713,804,788],{"class":723},[713,806,737],{"class":723},[713,808,809],{"class":740},"error",[713,811,796],{"class":723},[713,813,731],{"class":723},[713,815,816],{"class":727},")) ",[713,818,819],{"class":723},"{\n",[713,821,823,826,829,832,834,837,839,842,844,847,849,852,855,857,859,862],{"class":715,"line":822},4,[713,824,825],{"class":727},"  console",[713,827,828],{"class":723},".",[713,830,831],{"class":775},"log",[713,833,778],{"class":784},[713,835,836],{"class":727},"event",[713,838,828],{"class":723},[713,840,841],{"class":727},"timestamp",[713,843,799],{"class":723},[713,845,846],{"class":727}," event",[713,848,828],{"class":723},[713,850,851],{"class":727},"action",[713,853,854],{"class":723}," ??",[713,856,846],{"class":727},[713,858,828],{"class":723},[713,860,861],{"class":727},"message",[713,863,864],{"class":784},")\n",[713,866,868],{"class":715,"line":867},5,[713,869,870],{"class":723},"}\n",[587,872,873,876],{},[596,874,875],{},"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.",[878,879,346],"h3",{"id":880},"options",[882,883,884,900],"table",{},[885,886,887],"thead",{},[888,889,890,894,897],"tr",{},[891,892,893],"th",{},"Option",[891,895,896],{},"Type",[891,898,899],{},"Description",[901,902,903,922,939,954,968],"tbody",{},[888,904,905,911,916],{},[906,907,908],"td",{},[596,909,910],{},"dir",[906,912,913],{},[596,914,915],{},"string",[906,917,918,919,828],{},"Directory to read from. Default: ",[596,920,921],{},".evlog\u002Flogs",[888,923,924,928,933],{},[906,925,926],{},[596,927,678],{},[906,929,930],{},[596,931,932],{},"Date | string",[906,934,935,936,828],{},"Yield events with ",[596,937,938],{},"timestamp >= since",[888,940,941,945,949],{},[906,942,943],{},[596,944,681],{},[906,946,947],{},[596,948,932],{},[906,950,935,951,828],{},[596,952,953],{},"timestamp \u003C= until",[888,955,956,960,965],{},[906,957,958],{},[596,959,674],{},[906,961,962],{},[596,963,964],{},"LogLevel | LogLevel[]",[906,966,967],{},"Filter by event level.",[888,969,970,974,979],{},[906,971,972],{},[596,973,685],{},[906,975,976],{},[596,977,978],{},"(event) => boolean",[906,980,981],{},"Custom predicate.",[587,983,984],{},"Malformed lines (partial writes, manual edits) are silently skipped, so your script never crashes on a bad line.",[699,986,988],{"id":987},"live-tail","Live tail",[704,990,992],{"className":706,"code":991,"language":708,"meta":709,"style":709},"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",[596,993,994,1013,1017,1036,1074,1078,1118,1154],{"__ignoreMap":709},[713,995,996,998,1000,1003,1005,1007,1009,1011],{"class":715,"line":716},[713,997,720],{"class":719},[713,999,724],{"class":723},[713,1001,1002],{"class":727}," tailFsLogs",[713,1004,731],{"class":723},[713,1006,734],{"class":719},[713,1008,737],{"class":723},[713,1010,614],{"class":740},[713,1012,743],{"class":723},[713,1014,1015],{"class":715,"line":746},[713,1016,750],{"emptyLinePlaceholder":749},[713,1018,1019,1021,1024,1027,1030,1033],{"class":715,"line":753},[713,1020,766],{"class":765},[713,1022,1023],{"class":727}," ac ",[713,1025,1026],{"class":723},"=",[713,1028,1029],{"class":723}," new",[713,1031,1032],{"class":775}," AbortController",[713,1034,1035],{"class":727},"()\n",[713,1037,1038,1041,1043,1046,1048,1050,1053,1055,1057,1060,1063,1066,1068,1071],{"class":715,"line":822},[713,1039,1040],{"class":727},"process",[713,1042,828],{"class":723},[713,1044,1045],{"class":775},"on",[713,1047,778],{"class":727},[713,1049,796],{"class":723},[713,1051,1052],{"class":740},"SIGINT",[713,1054,796],{"class":723},[713,1056,799],{"class":723},[713,1058,1059],{"class":723}," ()",[713,1061,1062],{"class":765}," =>",[713,1064,1065],{"class":727}," ac",[713,1067,828],{"class":723},[713,1069,1070],{"class":775},"abort",[713,1072,1073],{"class":727},"())\n",[713,1075,1076],{"class":715,"line":867},[713,1077,750],{"emptyLinePlaceholder":749},[713,1079,1081,1083,1085,1087,1089,1091,1093,1095,1097,1099,1102,1104,1106,1108,1111,1114,1116],{"class":715,"line":1080},6,[713,1082,756],{"class":719},[713,1084,759],{"class":719},[713,1086,762],{"class":727},[713,1088,766],{"class":765},[713,1090,769],{"class":727},[713,1092,772],{"class":723},[713,1094,1002],{"class":775},[713,1096,778],{"class":727},[713,1098,781],{"class":723},[713,1100,1101],{"class":784}," signal",[713,1103,788],{"class":723},[713,1105,1065],{"class":727},[713,1107,828],{"class":723},[713,1109,1110],{"class":727},"signal ",[713,1112,1113],{"class":723},"}",[713,1115,816],{"class":727},[713,1117,819],{"class":723},[713,1119,1121,1123,1125,1127,1129,1131,1134,1136,1138,1140,1142,1144,1146,1148,1150,1152],{"class":715,"line":1120},7,[713,1122,825],{"class":727},[713,1124,828],{"class":723},[713,1126,831],{"class":775},[713,1128,778],{"class":784},[713,1130,796],{"class":723},[713,1132,1133],{"class":740},"live:",[713,1135,796],{"class":723},[713,1137,799],{"class":723},[713,1139,846],{"class":727},[713,1141,828],{"class":723},[713,1143,851],{"class":727},[713,1145,854],{"class":723},[713,1147,846],{"class":727},[713,1149,828],{"class":723},[713,1151,861],{"class":727},[713,1153,864],{"class":784},[713,1155,1157],{"class":715,"line":1156},8,[713,1158,870],{"class":723},[587,1160,1161,1164,1165,1168],{},[596,1162,1163],{},"tailFsLogs(options)"," first yields existing events (unless ",[596,1166,1167],{},"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.",[878,1170,1172],{"id":1171},"tail-specific-options","Tail-specific options",[882,1174,1175,1185],{},[885,1176,1177],{},[888,1178,1179,1181,1183],{},[891,1180,893],{},[891,1182,896],{},[891,1184,899],{},[901,1186,1187,1202,1217],{},[888,1188,1189,1194,1199],{},[906,1190,1191],{},[596,1192,1193],{},"pollIntervalMs",[906,1195,1196],{},[596,1197,1198],{},"number",[906,1200,1201],{},"Polling interval. Default: 500ms (minimum 50ms).",[888,1203,1204,1209,1214],{},[906,1205,1206],{},[596,1207,1208],{},"fromEnd",[906,1210,1211],{},[596,1212,1213],{},"boolean",[906,1215,1216],{},"Skip existing events; only yield future ones. Default: false.",[888,1218,1219,1224,1228],{},[906,1220,1221],{},[596,1222,1223],{},"signal",[906,1225,1226],{},[596,1227,668],{},[906,1229,1230],{},"Stop tailing when aborted.",[587,1232,1233,1234,1239],{},"All ",[591,1235,1237],{"href":1236},"#options",[596,1238,651],{}," options also apply.",[699,1241,1243],{"id":1242},"use-cases","Use cases",[633,1245,1246,1252,1255,1265],{},[636,1247,1248,1249,1251],{},"A local Electron \u002F Tauri dashboard reading ",[596,1250,602],{}," from a target project directory",[636,1253,1254],{},"A CI report aggregator that scans logs after a test run",[636,1256,1257,1258,1261,1262],{},"A ",[596,1259,1260],{},"grep","-style CLI that pipes filtered events into ",[596,1263,1264],{},"jq",[636,1266,1267,1268],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[591,1269,1271],{"href":1270},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1273,1274,1275],"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":709,"searchDepth":746,"depth":746,"links":1277},[1278,1281,1284],{"id":701,"depth":746,"text":702,"children":1279},[1280],{"id":880,"depth":753,"text":346},{"id":987,"depth":746,"text":988,"children":1282},[1283],{"id":1171,"depth":753,"text":1172},{"id":1242,"depth":746,"text":1243},"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":482,"icon":485},{"title":482,"description":1285},"R4g1MMNweLy_HA56RMBi-WG1D7Jb4XHOLc2nDmDbp2A",[1293,1295],{"title":478,"path":479,"stem":480,"description":1294,"icon":471,"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":415,"path":487,"stem":488,"description":1296,"icon":489,"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.",1789074383488]