refactor(replay-ui): extract snapshot flatten/getAtPath into lib module

replay-ui/src/lib/snapshot-diff.ts

@@ -0,0 +1,101 @@
+export interface Row {
+  path: string;
+  value: unknown;
+}
+
+export const INLINE_ARRAY_LIMIT = 2;
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return (
+    typeof value === "object" &&
+    value !== null &&
+    !Array.isArray(value) &&
+    Object.getPrototypeOf(value) === Object.prototype
+  );
+}
+
+export function flatten(input: Record<string, unknown>): Row[] {
+  const rows: Row[] = [];
+  const walk = (value: unknown, path: string) => {
+    if (isPlainObject(value)) {
+      const keys = Object.keys(value).sort();
+      if (keys.length === 0) {
+        rows.push({ path, value: {} });
+        return;
+      }
+      for (const key of keys) {
+        const nextPath = path === "" ? key : `${path}.${key}`;
+        walk(value[key], nextPath);
+      }
+      return;
+    }
+    if (Array.isArray(value)) {
+      if (value.length <= INLINE_ARRAY_LIMIT) {
+        rows.push({ path, value });
+        return;
+      }
+      for (let i = 0; i < value.length; i++) {
+        walk(value[i], `${path}[${i}]`);
+      }
+      return;
+    }
+    rows.push({ path, value });
+  };
+  for (const key of Object.keys(input).sort()) {
+    walk(input[key], key);
+  }
+  return rows.sort((a, b) => (a.path < b.path ? -1 : a.path > b.path ? 1 : 0));
+}
+
+export function getAtPath(
+  source: Record<string, unknown> | undefined,
+  path: string,
+): unknown {
+  if (!source) {
+    return undefined;
+  }
+  if (Object.prototype.hasOwnProperty.call(source, path)) {
+    return source[path];
+  }
+  const segments = path
+    .split(/\.|\[(\d+)\]/)
+    .filter((segment) => segment !== undefined && segment !== "");
+  let current: unknown = source;
+  for (const segment of segments) {
+    if (current === null || current === undefined) {
+      return undefined;
+    }
+    if (Array.isArray(current)) {
+      const index = Number(segment);
+      if (Number.isNaN(index)) {
+        return undefined;
+      }
+      current = current[index];
+      continue;
+    }
+    if (typeof current === "object") {
+      current = (current as Record<string, unknown>)[segment];
+      continue;
+    }
+    return undefined;
+  }
+  return current;
+}
+
+export function canonicalize(value: unknown): unknown {
+  if (Array.isArray(value)) {
+    return value.map(canonicalize);
+  }
+  if (isPlainObject(value)) {
+    const out: Record<string, unknown> = {};
+    for (const key of Object.keys(value).sort()) {
+      out[key] = canonicalize(value[key]);
+    }
+    return out;
+  }
+  return value;
+}
+
+export function stableStringify(value: unknown): string {
+  return JSON.stringify(canonicalize(value));
+}

replay-ui/src/panels/SnapshotTable.tsx

@@ -1,3 +1,4 @@
+import { flatten, getAtPath, stableStringify } from "../lib/snapshot-diff";
 import "./SnapshotTable.css";
 
 export interface SnapshotTableProps {
@@ -5,103 +6,6 @@ export interface SnapshotTableProps {
   previousSnapshots?: Record<string, unknown>;
 }
 
-interface Row {
-  path: string;
-  value: unknown;
-}
-
-const INLINE_ARRAY_LIMIT = 2;
-
-function isPlainObject(value: unknown): value is Record<string, unknown> {
-  return (
-    typeof value === "object" &&
-    value !== null &&
-    !Array.isArray(value) &&
-    Object.getPrototypeOf(value) === Object.prototype
-  );
-}
-
-function flatten(input: Record<string, unknown>): Row[] {
-  const rows: Row[] = [];
-  const walk = (value: unknown, path: string) => {
-    if (isPlainObject(value)) {
-      const keys = Object.keys(value).sort();
-      if (keys.length === 0) {
-        rows.push({ path, value: {} });
-        return;
-      }
-      for (const key of keys) {
-        const nextPath = path === "" ? key : `${path}.${key}`;
-        walk(value[key], nextPath);
-      }
-      return;
-    }
-    if (Array.isArray(value)) {
-      if (value.length <= INLINE_ARRAY_LIMIT) {
-        rows.push({ path, value });
-        return;
-      }
-      for (let i = 0; i < value.length; i++) {
-        walk(value[i], `${path}[${i}]`);
-      }
-      return;
-    }
-    rows.push({ path, value });
-  };
-  for (const key of Object.keys(input).sort()) {
-    walk(input[key], key);
-  }
-  return rows.sort((a, b) => (a.path < b.path ? -1 : a.path > b.path ? 1 : 0));
-}
-
-function getAtPath(source: Record<string, unknown> | undefined, path: string): unknown {
-  if (!source) {
-    return undefined;
-  }
-  if (Object.prototype.hasOwnProperty.call(source, path)) {
-    return source[path];
-  }
-  const segments = path.split(/\.|\[(\d+)\]/).filter((segment) => segment !== undefined && segment !== "");
-  let current: unknown = source;
-  for (const segment of segments) {
-    if (current === null || current === undefined) {
-      return undefined;
-    }
-    if (Array.isArray(current)) {
-      const index = Number(segment);
-      if (Number.isNaN(index)) {
-        return undefined;
-      }
-      current = current[index];
-      continue;
-    }
-    if (typeof current === "object") {
-      current = (current as Record<string, unknown>)[segment];
-      continue;
-    }
-    return undefined;
-  }
-  return current;
-}
-
-function canonicalize(value: unknown): unknown {
-  if (Array.isArray(value)) {
-    return value.map(canonicalize);
-  }
-  if (isPlainObject(value)) {
-    const out: Record<string, unknown> = {};
-    for (const key of Object.keys(value).sort()) {
-      out[key] = canonicalize(value[key]);
-    }
-    return out;
-  }
-  return value;
-}
-
-function stableStringify(value: unknown): string {
-  return JSON.stringify(canonicalize(value));
-}
-
 function formatValue(value: unknown): string {
   if (value === null) {
     return "null";