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The ",[613,630,631],{},"evlog\u002Ffs"," module also ships ",[634,635,636],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[639,640],"ndjson-tail",{},[642,643,646,649,707],"prompt",{":actions":644,"description":645,"icon":502},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[604,647,648],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[650,651,652,663,676,686,704],"ul",{},[653,654,655,656,658,659,662],"li",{},"Confirm the filesystem drain is wired up (",[613,657,631],{}," adapter writing NDJSON to ",[613,660,661],{},".evlog\u002Flogs\u002F*.jsonl",")",[653,664,665,666,669,670,672,673],{},"For replay: import ",[613,667,668],{},"readFsLogs"," from ",[613,671,631],{}," and iterate ",[613,674,675],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[653,677,678,679,682,683],{},"For follow mode: import ",[613,680,681],{},"tailFsLogs"," and iterate the same way. It watches for new lines, handles rotation, and accepts an ",[613,684,685],{},"AbortSignal",[653,687,688,689,692,693,692,696,699,700,703],{},"Apply filters at read time (",[613,690,691],{},"level",", ",[613,694,695],{},"since",[613,697,698],{},"until",", custom ",[613,701,702],{},"filter"," predicate) instead of post-processing",[653,705,706],{},"Treat malformed lines as silently skipped (partial writes happen), and never crash the script on a bad line",[604,708,709,710],{},"Docs: ",[608,711,712],{"href":712,"rel":713},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[714],"nofollow",[716,717,719],"h2",{"id":718},"replay-history","Replay history",[721,722,727],"pre",{"className":723,"code":724,"language":725,"meta":726,"style":726},"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","",[613,728,729,761,768,837,882],{"__ignoreMap":726},[730,731,734,738,742,746,749,752,755,758],"span",{"class":732,"line":733},"line",1,[730,735,737],{"class":736},"s7zQu","import",[730,739,741],{"class":740},"sMK4o"," {",[730,743,745],{"class":744},"sTEyZ"," readFsLogs",[730,747,748],{"class":740}," }",[730,750,751],{"class":736}," from",[730,753,754],{"class":740}," '",[730,756,631],{"class":757},"sfazB",[730,759,760],{"class":740},"'\n",[730,762,764],{"class":732,"line":763},2,[730,765,767],{"emptyLinePlaceholder":766},true,"\n",[730,769,771,774,777,780,784,787,790,793,796,799,803,806,808,811,814,817,820,822,824,827,829,831,834],{"class":732,"line":770},3,[730,772,773],{"class":736},"for",[730,775,776],{"class":736}," await",[730,778,779],{"class":744}," (",[730,781,783],{"class":782},"spNyl","const",[730,785,786],{"class":744}," event ",[730,788,789],{"class":740},"of",[730,791,745],{"class":792},"s2Zo4",[730,794,795],{"class":744},"(",[730,797,798],{"class":740},"{",[730,800,802],{"class":801},"swJcz"," since",[730,804,805],{"class":740},":",[730,807,754],{"class":740},[730,809,810],{"class":757},"2026-03-01",[730,812,813],{"class":740},"'",[730,815,816],{"class":740},",",[730,818,819],{"class":801}," level",[730,821,805],{"class":740},[730,823,754],{"class":740},[730,825,826],{"class":757},"error",[730,828,813],{"class":740},[730,830,748],{"class":740},[730,832,833],{"class":744},")) ",[730,835,836],{"class":740},"{\n",[730,838,840,843,846,849,851,854,856,859,861,864,866,869,872,874,876,879],{"class":732,"line":839},4,[730,841,842],{"class":744},"  console",[730,844,845],{"class":740},".",[730,847,848],{"class":792},"log",[730,850,795],{"class":801},[730,852,853],{"class":744},"event",[730,855,845],{"class":740},[730,857,858],{"class":744},"timestamp",[730,860,816],{"class":740},[730,862,863],{"class":744}," event",[730,865,845],{"class":740},[730,867,868],{"class":744},"action",[730,870,871],{"class":740}," ??",[730,873,863],{"class":744},[730,875,845],{"class":740},[730,877,878],{"class":744},"message",[730,880,881],{"class":801},")\n",[730,883,885],{"class":732,"line":884},5,[730,886,887],{"class":740},"}\n",[604,889,890,893],{},[613,891,892],{},"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.",[895,896,346],"h3",{"id":897},"options",[899,900,901,917],"table",{},[902,903,904],"thead",{},[905,906,907,911,914],"tr",{},[908,909,910],"th",{},"Option",[908,912,913],{},"Type",[908,915,916],{},"Description",[918,919,920,939,956,971,985],"tbody",{},[905,921,922,928,933],{},[923,924,925],"td",{},[613,926,927],{},"dir",[923,929,930],{},[613,931,932],{},"string",[923,934,935,936,845],{},"Directory to read from. Default: ",[613,937,938],{},".evlog\u002Flogs",[905,940,941,945,950],{},[923,942,943],{},[613,944,695],{},[923,946,947],{},[613,948,949],{},"Date | string",[923,951,952,953,845],{},"Yield events with ",[613,954,955],{},"timestamp >= since",[905,957,958,962,966],{},[923,959,960],{},[613,961,698],{},[923,963,964],{},[613,965,949],{},[923,967,952,968,845],{},[613,969,970],{},"timestamp \u003C= until",[905,972,973,977,982],{},[923,974,975],{},[613,976,691],{},[923,978,979],{},[613,980,981],{},"LogLevel | LogLevel[]",[923,983,984],{},"Filter by event level.",[905,986,987,991,996],{},[923,988,989],{},[613,990,702],{},[923,992,993],{},[613,994,995],{},"(event) => boolean",[923,997,998],{},"Custom predicate.",[604,1000,1001],{},"Malformed lines (partial writes, manual edits) are silently skipped, so your script never crashes on a bad line.",[716,1003,1005],{"id":1004},"live-tail","Live tail",[721,1007,1009],{"className":723,"code":1008,"language":725,"meta":726,"style":726},"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",[613,1010,1011,1030,1034,1053,1091,1095,1135,1171],{"__ignoreMap":726},[730,1012,1013,1015,1017,1020,1022,1024,1026,1028],{"class":732,"line":733},[730,1014,737],{"class":736},[730,1016,741],{"class":740},[730,1018,1019],{"class":744}," tailFsLogs",[730,1021,748],{"class":740},[730,1023,751],{"class":736},[730,1025,754],{"class":740},[730,1027,631],{"class":757},[730,1029,760],{"class":740},[730,1031,1032],{"class":732,"line":763},[730,1033,767],{"emptyLinePlaceholder":766},[730,1035,1036,1038,1041,1044,1047,1050],{"class":732,"line":770},[730,1037,783],{"class":782},[730,1039,1040],{"class":744}," ac ",[730,1042,1043],{"class":740},"=",[730,1045,1046],{"class":740}," new",[730,1048,1049],{"class":792}," AbortController",[730,1051,1052],{"class":744},"()\n",[730,1054,1055,1058,1060,1063,1065,1067,1070,1072,1074,1077,1080,1083,1085,1088],{"class":732,"line":839},[730,1056,1057],{"class":744},"process",[730,1059,845],{"class":740},[730,1061,1062],{"class":792},"on",[730,1064,795],{"class":744},[730,1066,813],{"class":740},[730,1068,1069],{"class":757},"SIGINT",[730,1071,813],{"class":740},[730,1073,816],{"class":740},[730,1075,1076],{"class":740}," ()",[730,1078,1079],{"class":782}," =>",[730,1081,1082],{"class":744}," ac",[730,1084,845],{"class":740},[730,1086,1087],{"class":792},"abort",[730,1089,1090],{"class":744},"())\n",[730,1092,1093],{"class":732,"line":884},[730,1094,767],{"emptyLinePlaceholder":766},[730,1096,1098,1100,1102,1104,1106,1108,1110,1112,1114,1116,1119,1121,1123,1125,1128,1131,1133],{"class":732,"line":1097},6,[730,1099,773],{"class":736},[730,1101,776],{"class":736},[730,1103,779],{"class":744},[730,1105,783],{"class":782},[730,1107,786],{"class":744},[730,1109,789],{"class":740},[730,1111,1019],{"class":792},[730,1113,795],{"class":744},[730,1115,798],{"class":740},[730,1117,1118],{"class":801}," signal",[730,1120,805],{"class":740},[730,1122,1082],{"class":744},[730,1124,845],{"class":740},[730,1126,1127],{"class":744},"signal ",[730,1129,1130],{"class":740},"}",[730,1132,833],{"class":744},[730,1134,836],{"class":740},[730,1136,1138,1140,1142,1144,1146,1148,1151,1153,1155,1157,1159,1161,1163,1165,1167,1169],{"class":732,"line":1137},7,[730,1139,842],{"class":744},[730,1141,845],{"class":740},[730,1143,848],{"class":792},[730,1145,795],{"class":801},[730,1147,813],{"class":740},[730,1149,1150],{"class":757},"live:",[730,1152,813],{"class":740},[730,1154,816],{"class":740},[730,1156,863],{"class":744},[730,1158,845],{"class":740},[730,1160,868],{"class":744},[730,1162,871],{"class":740},[730,1164,863],{"class":744},[730,1166,845],{"class":740},[730,1168,878],{"class":744},[730,1170,881],{"class":801},[730,1172,1174],{"class":732,"line":1173},8,[730,1175,887],{"class":740},[604,1177,1178,1181,1182,1185],{},[613,1179,1180],{},"tailFsLogs(options)"," first yields existing events (unless ",[613,1183,1184],{},"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.",[895,1187,1189],{"id":1188},"tail-specific-options","Tail-specific options",[899,1191,1192,1202],{},[902,1193,1194],{},[905,1195,1196,1198,1200],{},[908,1197,910],{},[908,1199,913],{},[908,1201,916],{},[918,1203,1204,1219,1234],{},[905,1205,1206,1211,1216],{},[923,1207,1208],{},[613,1209,1210],{},"pollIntervalMs",[923,1212,1213],{},[613,1214,1215],{},"number",[923,1217,1218],{},"Polling interval. Default: 500ms (minimum 50ms).",[905,1220,1221,1226,1231],{},[923,1222,1223],{},[613,1224,1225],{},"fromEnd",[923,1227,1228],{},[613,1229,1230],{},"boolean",[923,1232,1233],{},"Skip existing events; only yield future ones. Default: false.",[905,1235,1236,1241,1245],{},[923,1237,1238],{},[613,1239,1240],{},"signal",[923,1242,1243],{},[613,1244,685],{},[923,1246,1247],{},"Stop tailing when aborted.",[604,1249,1250,1251,1256],{},"All ",[608,1252,1254],{"href":1253},"#options",[613,1255,668],{}," options also apply.",[716,1258,1260],{"id":1259},"use-cases","Use cases",[650,1262,1263,1269,1272,1282],{},[653,1264,1265,1266,1268],{},"A local Electron \u002F Tauri dashboard reading ",[613,1267,619],{}," from a target project directory",[653,1270,1271],{},"A CI report aggregator that scans logs after a test run",[653,1273,1274,1275,1278,1279],{},"A ",[613,1276,1277],{},"grep","-style CLI that pipes filtered events into ",[613,1280,1281],{},"jq",[653,1283,1284,1285],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[608,1286,1288],{"href":1287},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1290,1291,1292],"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":726,"searchDepth":763,"depth":763,"links":1294},[1295,1298,1301],{"id":718,"depth":763,"text":719,"children":1296},[1297],{"id":897,"depth":770,"text":346},{"id":1004,"depth":763,"text":1005,"children":1299},[1300],{"id":1188,"depth":770,"text":1189},{"id":1259,"depth":763,"text":1260},"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":499,"icon":502},{"title":499,"description":1302},"LgH5M3mvbBfx4DV-d74aY1ePRFDzdC6qJOP2PnPTI2c",[1310,1312],{"title":495,"path":496,"stem":497,"description":1311,"icon":488,"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":504,"stem":505,"description":1313,"icon":506,"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.",1789076918843]