diff --git a/extensions/oc-path/src/oc-path/find.ts b/extensions/oc-path/src/oc-path/find.ts
index 3b95d907273..8de819c8053 100644
--- a/extensions/oc-path/src/oc-path/find.ts
+++ b/extensions/oc-path/src/oc-path/find.ts
@@ -11,6 +11,7 @@ import { isMap, isScalar, isSeq, type Node, type Pair } from "yaml";
 import type { MdAst } from "./ast.js";
 import type { JsoncValue } from "./jsonc/ast.js";
 import type { JsonlAst, JsonlLine } from "./jsonl/ast.js";
+import { pickJsonlLine } from "./jsonl/line.js";
 import type { OcPath } from "./oc-path.js";
 import {
   MAX_TRAVERSAL_DEPTH,
@@ -364,7 +365,7 @@ const jsonlOps: WalkOps<JsonlAst> = {
     }
   },
   lookup(ast, key) {
-    const line = pickLine(ast, key);
+    const line = pickJsonlLine(ast, key);
     if (line === null) {
       return null;
     }
@@ -440,37 +441,6 @@ function topLevelLeafText(value: JsoncValue, key: string): string | null {
   return null;
 }
 
-function pickLine(ast: JsonlAst, addr: string): JsonlLine | null {
-  if (addr === "$first") {
-    for (const l of ast.lines) {
-      if (l.kind === "value") {
-        return l;
-      }
-    }
-    return null;
-  }
-  if (addr === "$last") {
-    for (let i = ast.lines.length - 1; i >= 0; i--) {
-      const l = ast.lines[i];
-      if (l !== undefined && l.kind === "value") {
-        return l;
-      }
-    }
-    return null;
-  }
-  const m = /^L(\d+)$/.exec(addr);
-  if (m === null || m[1] === undefined) {
-    return null;
-  }
-  const target = Number(m[1]);
-  for (const l of ast.lines) {
-    if (l.line === target) {
-      return l;
-    }
-  }
-  return null;
-}
-
 // ---------- YAML walker ----------------------------------------------------
 
 function walkYaml(
diff --git a/extensions/oc-path/src/oc-path/jsonl/line.ts b/extensions/oc-path/src/oc-path/jsonl/line.ts
new file mode 100644
index 00000000000..ec7ffaefd67
--- /dev/null
+++ b/extensions/oc-path/src/oc-path/jsonl/line.ts
@@ -0,0 +1,33 @@
+import { POS_FIRST, POS_LAST } from "../oc-path.js";
+import type { JsonlAst, JsonlLine } from "./ast.js";
+
+export function pickJsonlLine(ast: JsonlAst, addr: string): JsonlLine | null {
+  if (addr === POS_FIRST) {
+    for (const line of ast.lines) {
+      if (line.kind === "value") {
+        return line;
+      }
+    }
+    return null;
+  }
+  if (addr === POS_LAST) {
+    for (let index = ast.lines.length - 1; index >= 0; index -= 1) {
+      const line = ast.lines[index];
+      if (line !== undefined && line.kind === "value") {
+        return line;
+      }
+    }
+    return null;
+  }
+  const match = /^L(\d+)$/.exec(addr);
+  if (match === null || match[1] === undefined) {
+    return null;
+  }
+  const target = Number(match[1]);
+  for (const line of ast.lines) {
+    if (line.line === target) {
+      return line;
+    }
+  }
+  return null;
+}
diff --git a/extensions/oc-path/src/oc-path/jsonl/resolve.ts b/extensions/oc-path/src/oc-path/jsonl/resolve.ts
index e77d4c50a75..65aef313777 100644
--- a/extensions/oc-path/src/oc-path/jsonl/resolve.ts
+++ b/extensions/oc-path/src/oc-path/jsonl/resolve.ts
@@ -18,14 +18,9 @@
 import type { JsoncEntry, JsoncValue } from "../jsonc/ast.js";
 import { resolveJsoncValueOcPath } from "../jsonc/resolve-value.js";
 import type { OcPath } from "../oc-path.js";
-import {
-  POS_FIRST,
-  POS_LAST,
-  isQuotedSeg,
-  splitRespectingBrackets,
-  unquoteSeg,
-} from "../oc-path.js";
+import { isQuotedSeg, splitRespectingBrackets, unquoteSeg } from "../oc-path.js";
 import type { JsonlAst, JsonlLine } from "./ast.js";
+import { pickJsonlLine } from "./line.js";
 
 export type JsonlOcPathMatch =
   | { readonly kind: "root"; readonly node: JsonlAst }
@@ -50,7 +45,7 @@ export function resolveJsonlOcPath(ast: JsonlAst, path: OcPath): JsonlOcPathMatc
     return { kind: "root", node: ast };
   }
 
-  const lineEntry = pickLine(ast, head);
+  const lineEntry = pickJsonlLine(ast, head);
   if (lineEntry === null) {
     return null;
   }
@@ -90,34 +85,3 @@ export function resolveJsonlOcPath(ast: JsonlAst, path: OcPath): JsonlOcPathMatc
   }
   return { kind: "value", node: match.node, line: lineEntry.line, path: match.path };
 }
-
-function pickLine(ast: JsonlAst, addr: string): JsonlLine | null {
-  if (addr === POS_FIRST) {
-    for (const l of ast.lines) {
-      if (l.kind === "value") {
-        return l;
-      }
-    }
-    return null;
-  }
-  if (addr === POS_LAST) {
-    for (let i = ast.lines.length - 1; i >= 0; i--) {
-      const l = ast.lines[i];
-      if (l !== undefined && l.kind === "value") {
-        return l;
-      }
-    }
-    return null;
-  }
-  const m = /^L(\d+)$/.exec(addr);
-  if (m === null || m[1] === undefined) {
-    return null;
-  }
-  const target = Number(m[1]);
-  for (const l of ast.lines) {
-    if (l.line === target) {
-      return l;
-    }
-  }
-  return null;
-}