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The ",[543,560,561],{},"evlog\u002Ffs"," module also ships ",[564,565,566],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[569,570],"ndjson-tail",{},[572,573,576,579,637],"prompt",{":actions":574,"description":575,"icon":462},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[534,577,578],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[580,581,582,593,606,616,634],"ul",{},[583,584,585,586,588,589,592],"li",{},"Confirm the filesystem drain is wired up (",[543,587,561],{}," adapter writing NDJSON to ",[543,590,591],{},".evlog\u002Flogs\u002F*.jsonl",")",[583,594,595,596,599,600,602,603],{},"For replay: import ",[543,597,598],{},"readFsLogs"," from ",[543,601,561],{}," and iterate ",[543,604,605],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[583,607,608,609,612,613],{},"For follow mode: import ",[543,610,611],{},"tailFsLogs"," and iterate the same way — it watches for new lines, handles rotation, and accepts an ",[543,614,615],{},"AbortSignal",[583,617,618,619,622,623,622,626,629,630,633],{},"Apply filters at read time (",[543,620,621],{},"level",", ",[543,624,625],{},"since",[543,627,628],{},"until",", custom ",[543,631,632],{},"filter"," predicate) instead of post-processing",[583,635,636],{},"Treat malformed lines as silently skipped (partial writes happen) — never crash the script on a bad line",[534,638,639,640],{},"Docs: ",[538,641,642],{"href":642,"rel":643},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[644],"nofollow",[646,647,649],"h2",{"id":648},"replay-history","Replay history",[651,652,657],"pre",{"className":653,"code":654,"language":655,"meta":656,"style":656},"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","",[543,658,659,691,698,767,812],{"__ignoreMap":656},[660,661,664,668,672,676,679,682,685,688],"span",{"class":662,"line":663},"line",1,[660,665,667],{"class":666},"s7zQu","import",[660,669,671],{"class":670},"sMK4o"," {",[660,673,675],{"class":674},"sTEyZ"," readFsLogs",[660,677,678],{"class":670}," }",[660,680,681],{"class":666}," from",[660,683,684],{"class":670}," '",[660,686,561],{"class":687},"sfazB",[660,689,690],{"class":670},"'\n",[660,692,694],{"class":662,"line":693},2,[660,695,697],{"emptyLinePlaceholder":696},true,"\n",[660,699,701,704,707,710,714,717,720,723,726,729,733,736,738,741,744,747,750,752,754,757,759,761,764],{"class":662,"line":700},3,[660,702,703],{"class":666},"for",[660,705,706],{"class":666}," await",[660,708,709],{"class":674}," (",[660,711,713],{"class":712},"spNyl","const",[660,715,716],{"class":674}," event ",[660,718,719],{"class":670},"of",[660,721,675],{"class":722},"s2Zo4",[660,724,725],{"class":674},"(",[660,727,728],{"class":670},"{",[660,730,732],{"class":731},"swJcz"," since",[660,734,735],{"class":670},":",[660,737,684],{"class":670},[660,739,740],{"class":687},"2026-03-01",[660,742,743],{"class":670},"'",[660,745,746],{"class":670},",",[660,748,749],{"class":731}," level",[660,751,735],{"class":670},[660,753,684],{"class":670},[660,755,756],{"class":687},"error",[660,758,743],{"class":670},[660,760,678],{"class":670},[660,762,763],{"class":674},")) ",[660,765,766],{"class":670},"{\n",[660,768,770,773,776,779,781,784,786,789,791,794,796,799,802,804,806,809],{"class":662,"line":769},4,[660,771,772],{"class":674},"  console",[660,774,775],{"class":670},".",[660,777,778],{"class":722},"log",[660,780,725],{"class":731},[660,782,783],{"class":674},"event",[660,785,775],{"class":670},[660,787,788],{"class":674},"timestamp",[660,790,746],{"class":670},[660,792,793],{"class":674}," event",[660,795,775],{"class":670},[660,797,798],{"class":674},"action",[660,800,801],{"class":670}," ??",[660,803,793],{"class":674},[660,805,775],{"class":670},[660,807,808],{"class":674},"message",[660,810,811],{"class":731},")\n",[660,813,815],{"class":662,"line":814},5,[660,816,817],{"class":670},"}\n",[534,819,820,823],{},[543,821,822],{},"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.",[825,826,332],"h3",{"id":827},"options",[829,830,831,847],"table",{},[832,833,834],"thead",{},[835,836,837,841,844],"tr",{},[838,839,840],"th",{},"Option",[838,842,843],{},"Type",[838,845,846],{},"Description",[848,849,850,869,886,901,915],"tbody",{},[835,851,852,858,863],{},[853,854,855],"td",{},[543,856,857],{},"dir",[853,859,860],{},[543,861,862],{},"string",[853,864,865,866,775],{},"Directory to read from. Default: ",[543,867,868],{},".evlog\u002Flogs",[835,870,871,875,880],{},[853,872,873],{},[543,874,625],{},[853,876,877],{},[543,878,879],{},"Date | string",[853,881,882,883,775],{},"Yield events with ",[543,884,885],{},"timestamp >= since",[835,887,888,892,896],{},[853,889,890],{},[543,891,628],{},[853,893,894],{},[543,895,879],{},[853,897,882,898,775],{},[543,899,900],{},"timestamp \u003C= until",[835,902,903,907,912],{},[853,904,905],{},[543,906,621],{},[853,908,909],{},[543,910,911],{},"LogLevel | LogLevel[]",[853,913,914],{},"Filter by event level.",[835,916,917,921,926],{},[853,918,919],{},[543,920,632],{},[853,922,923],{},[543,924,925],{},"(event) => boolean",[853,927,928],{},"Custom predicate.",[534,930,931],{},"Malformed lines (partial writes, manual edits) are silently skipped, so your script never crashes on a bad line.",[646,933,935],{"id":934},"live-tail","Live tail",[651,937,939],{"className":653,"code":938,"language":655,"meta":656,"style":656},"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",[543,940,941,960,964,983,1021,1025,1065,1101],{"__ignoreMap":656},[660,942,943,945,947,950,952,954,956,958],{"class":662,"line":663},[660,944,667],{"class":666},[660,946,671],{"class":670},[660,948,949],{"class":674}," tailFsLogs",[660,951,678],{"class":670},[660,953,681],{"class":666},[660,955,684],{"class":670},[660,957,561],{"class":687},[660,959,690],{"class":670},[660,961,962],{"class":662,"line":693},[660,963,697],{"emptyLinePlaceholder":696},[660,965,966,968,971,974,977,980],{"class":662,"line":700},[660,967,713],{"class":712},[660,969,970],{"class":674}," ac ",[660,972,973],{"class":670},"=",[660,975,976],{"class":670}," new",[660,978,979],{"class":722}," AbortController",[660,981,982],{"class":674},"()\n",[660,984,985,988,990,993,995,997,1000,1002,1004,1007,1010,1013,1015,1018],{"class":662,"line":769},[660,986,987],{"class":674},"process",[660,989,775],{"class":670},[660,991,992],{"class":722},"on",[660,994,725],{"class":674},[660,996,743],{"class":670},[660,998,999],{"class":687},"SIGINT",[660,1001,743],{"class":670},[660,1003,746],{"class":670},[660,1005,1006],{"class":670}," ()",[660,1008,1009],{"class":712}," =>",[660,1011,1012],{"class":674}," ac",[660,1014,775],{"class":670},[660,1016,1017],{"class":722},"abort",[660,1019,1020],{"class":674},"())\n",[660,1022,1023],{"class":662,"line":814},[660,1024,697],{"emptyLinePlaceholder":696},[660,1026,1028,1030,1032,1034,1036,1038,1040,1042,1044,1046,1049,1051,1053,1055,1058,1061,1063],{"class":662,"line":1027},6,[660,1029,703],{"class":666},[660,1031,706],{"class":666},[660,1033,709],{"class":674},[660,1035,713],{"class":712},[660,1037,716],{"class":674},[660,1039,719],{"class":670},[660,1041,949],{"class":722},[660,1043,725],{"class":674},[660,1045,728],{"class":670},[660,1047,1048],{"class":731}," signal",[660,1050,735],{"class":670},[660,1052,1012],{"class":674},[660,1054,775],{"class":670},[660,1056,1057],{"class":674},"signal ",[660,1059,1060],{"class":670},"}",[660,1062,763],{"class":674},[660,1064,766],{"class":670},[660,1066,1068,1070,1072,1074,1076,1078,1081,1083,1085,1087,1089,1091,1093,1095,1097,1099],{"class":662,"line":1067},7,[660,1069,772],{"class":674},[660,1071,775],{"class":670},[660,1073,778],{"class":722},[660,1075,725],{"class":731},[660,1077,743],{"class":670},[660,1079,1080],{"class":687},"live:",[660,1082,743],{"class":670},[660,1084,746],{"class":670},[660,1086,793],{"class":674},[660,1088,775],{"class":670},[660,1090,798],{"class":674},[660,1092,801],{"class":670},[660,1094,793],{"class":674},[660,1096,775],{"class":670},[660,1098,808],{"class":674},[660,1100,811],{"class":731},[660,1102,1104],{"class":662,"line":1103},8,[660,1105,817],{"class":670},[534,1107,1108,1111,1112,1115],{},[543,1109,1110],{},"tailFsLogs(options)"," first yields existing events (unless ",[543,1113,1114],{},"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.",[825,1117,1119],{"id":1118},"tail-specific-options","Tail-specific options",[829,1121,1122,1132],{},[832,1123,1124],{},[835,1125,1126,1128,1130],{},[838,1127,840],{},[838,1129,843],{},[838,1131,846],{},[848,1133,1134,1149,1164],{},[835,1135,1136,1141,1146],{},[853,1137,1138],{},[543,1139,1140],{},"pollIntervalMs",[853,1142,1143],{},[543,1144,1145],{},"number",[853,1147,1148],{},"Polling interval. Default: 500ms (minimum 50ms).",[835,1150,1151,1156,1161],{},[853,1152,1153],{},[543,1154,1155],{},"fromEnd",[853,1157,1158],{},[543,1159,1160],{},"boolean",[853,1162,1163],{},"Skip existing events; only yield future ones. Default: false.",[835,1165,1166,1171,1175],{},[853,1167,1168],{},[543,1169,1170],{},"signal",[853,1172,1173],{},[543,1174,615],{},[853,1176,1177],{},"Stop tailing when aborted.",[534,1179,1180,1181,1186],{},"All ",[538,1182,1184],{"href":1183},"#options",[543,1185,598],{}," options also apply.",[646,1188,1190],{"id":1189},"use-cases","Use cases",[580,1192,1193,1199,1202,1212],{},[583,1194,1195,1196,1198],{},"A local Electron \u002F Tauri dashboard reading ",[543,1197,549],{}," from a target project directory",[583,1200,1201],{},"A CI report aggregator that scans logs after a test run",[583,1203,1204,1205,1208,1209],{},"A ",[543,1206,1207],{},"grep","-style CLI that pipes filtered events into ",[543,1210,1211],{},"jq",[583,1213,1214,1215],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[538,1216,1218],{"href":1217},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1220,1221,1222],"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":656,"searchDepth":693,"depth":693,"links":1224},[1225,1228,1231],{"id":648,"depth":693,"text":649,"children":1226},[1227],{"id":827,"depth":700,"text":332},{"id":934,"depth":693,"text":935,"children":1229},[1230],{"id":1118,"depth":700,"text":1119},{"id":1189,"depth":693,"text":1190},"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":459,"icon":462},{"title":459,"description":1232},"F2Kv3aUC2PS9VZEw4PMc4drxbSxC1lSj2Gja9mn14iA",[1240,1242],{"title":455,"path":456,"stem":457,"description":1241,"icon":448,"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":403,"path":464,"stem":465,"description":1243,"icon":466,"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.",1786793481792]