Introduce Path type alias for path arrays in LiveObjects code

[lawrence-forooghian]

Slightly more readable, I think, especially for string[][].

Summary by CodeRabbit

• Refactor
  • Standardized path representation across the live-objects plugin and updated related APIs for consistent type usage. No functional behavior changes; improvements are internal and aimed at better consistency and type safety.

[coderabbitai]

Walkthrough

This PR introduces a shared Path type across the liveobjects plugin and standardizes path representation throughout four modules. A new Path type (defined as string[]) replaces inline string[] annotations in method signatures, internal fields, event types, and subscription interfaces.

Changes

Path Type Standardization

Layer / File(s)	Summary
Path type definition src/plugins/liveobjects/path.ts	Exports a new Path type alias representing an object-graph path as an array of string key segments.
LiveObject path calculation refactor src/plugins/liveobjects/liveobject.ts	getFullPaths() method signature changes from string[][] to Path[] return type; internal DFS stack and currentPath tracking refactored to use Path values.
PathObject internal path handling refactor src/plugins/liveobjects/pathobject.ts	Constructor path parameter, _path field, and private helper methods (_resolvePath, _escapePath) updated to use Path type instead of string[].
Subscription registration and events refactor src/plugins/liveobjects/pathobjectsubscriptionregister.ts	SubscriptionEntry.path and PathEvent.path interfaces, exported subscribe() method signature, and internal path helpers (_pathStartsWith, _pathsAreEqual) updated to use Path type.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

I am a rabbit in the code-lined glen,
I hop along keys again and again,
A tidy Path now guides my way,
No more arrays that gone astray —
Hooray for shared types, hoppy day! 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and directly summarizes the main change: introducing a Path type alias for path arrays in LiveObjects code, which matches the actual changes across all modified files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch typealias-Path

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/plugins/liveobjects/liveobject.ts`:
- Line 7: Replace the runtime import of Path with a type-only import: since Path
is declared as a type (export type Path = string[]), update the import statement
that references Path in this module to use TypeScript's type-only import form so
the compiler/transpiler emits no runtime import for Path; locate the import line
importing Path from './path' in src/plugins/liveobjects/liveobject.ts and change
it accordingly so usages of the Path type in this file remain valid but no
runtime import is emitted.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 53a539b8-da93-4d81-adfe-2eed42528978

📥 Commits

Reviewing files that changed from the base of the PR and between d3e8b5b and e454f57.

📒 Files selected for processing (4)

• src/plugins/liveobjects/liveobject.ts
• src/plugins/liveobjects/path.ts
• src/plugins/liveobjects/pathobject.ts
• src/plugins/liveobjects/pathobjectsubscriptionregister.ts

[coderabbitai]

⚠️ Potential issue | 🟡 Minor | ⚡ Quick win

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo "== Toolchain settings that affect type-only imports =="
fd -HI 'tsconfig*.json' -t f | while read -r f; do
  echo "-- $f"
  rg -n '"verbatimModuleSyntax"|"importsNotUsedAsValues"|"isolatedModules"' "$f" || true
done

fd -HI 'babel*.json|babel*.js|.swcrc|package.json' -t f | while read -r f; do
  echo "-- $f"
  rg -n '`@babel/preset-typescript`|onlyRemoveTypeImports|swc' "$f" || true
done

echo
echo "== Value imports of Path from ./path =="
rg -nP "import\s+\{\s*Path\s*\}\s+from\s+'\.\/path';" --type=ts

echo
echo "== Type-only imports of Path from ./path =="
rg -nP "import\s+type\s+\{\s*Path\s*\}\s+from\s+'\.\/path';" --type=ts || true

Repository: ably/ably-js

Length of output: 24586

---

🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo "=== Check Path export in path.ts ==="
cat -n "src/plugins/liveobjects/path.ts" | head -50

echo ""
echo "=== Check Path usage in liveobject.ts ==="
cat -n "src/plugins/liveobjects/liveobject.ts" | head -100

echo ""
echo "=== Check Path usage in pathobject.ts ==="
cat -n "src/plugins/liveobjects/pathobject.ts" | head -100

echo ""
echo "=== Check Path usage in pathobjectsubscriptionregister.ts ==="
cat -n "src/plugins/liveobjects/pathobjectsubscriptionregister.ts" | head -100

echo ""
echo "=== Check tsconfig.json for relevant settings ==="
cat "tsconfig.json" | grep -A 20 "compilerOptions"

Repository: ably/ably-js

Length of output: 12892

---

🏁 Script executed:

#!/bin/bash
# Quick check to see how Path is actually used in the method bodies of liveobject.ts
# to confirm it's truly type-only and not used at runtime

rg -A 5 "getFullPaths" src/plugins/liveobjects/liveobject.ts | head -30

Repository: ably/ably-js

Length of output: 412

---

Use a type-only import for Path.

Since Path is declared as export type Path = string[], import it with import type syntax to signal that it's a type-only symbol and avoid runtime import emission issues with stricter TypeScript configurations or transpilers.

Suggested patch

-import { Path } from './path';
+import type { Path } from './path';

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@src/plugins/liveobjects/liveobject.ts` at line 7, Replace the runtime import
of Path with a type-only import: since Path is declared as a type (export type
Path = string[]), update the import statement that references Path in this
module to use TypeScript's type-only import form so the compiler/transpiler
emits no runtime import for Path; locate the import line importing Path from
'./path' in src/plugins/liveobjects/liveobject.ts and change it accordingly so
usages of the Path type in this file remain valid but no runtime import is
emitted.