ts-lc

A VS Code template for solving LeetCode problems in TypeScript.

ts-lc is an addon on top of the VS Code LeetCode extension. It provides a richer local TypeScript development environment while keeping the LeetCode extension responsible for interacting with LeetCode.

Getting Started

1. Fork this repository.
2. Clone it.
3. Run:

pnpm install

4. Open the repository in VS Code.
5. Install the recommended extensions.
6. Configure the LeetCode extension to use the src directory as its workspace folder.

You can either set this manually through the extension or add the following to global settings.json

"leetcode.workspaceFolder": "...\\ts-lc\\src"
"leetcode.defaultLanguage": "typescript",

Once configured, LeetCode problem files are created inside src.

The LeetCode extension is required

This repository does not replace the LeetCode extension.

The extension handles:

• Signing in to LeetCode
• Pulling problems
• Creating problem files
• Running LeetCode test cases
• Submitting solutions
• Other LeetCode API interactions

Use this repository as the local development environment on top of the extension.

---

Recommended Extensions

The repository recommends:

{
  "recommendations": [
    "dbaeumer.vscode-eslint",
    "esbenp.prettier-vscode",
    "leetcode.vscode-leetcode",
    "yoavbls.pretty-ts-errors",
    "orta.vscode-twoslash-queries",
    "wallabyjs.quokka-vscode"
  ]
}

ESLint

dbaeumer.vscode-eslint

Provides ESLint integration and diagnostics directly in VS Code.

Prettier

esbenp.prettier-vscode

Provides formatting using the repository's Prettier configuration.

LeetCode

leetcode.vscode-leetcode

Critical to this template. Handles the actual interaction with LeetCode, including authentication, pulling questions, testing and submission.

Pretty TypeScript Errors

yoavbls.pretty-ts-errors

Makes large and deeply nested TypeScript diagnostics easier to read.

Twoslash Queries

orta.vscode-twoslash-queries

Allows TypeScript types to be inspected directly in the editor.

Quokka.js

wallabyjs.quokka-vscode

Runs JavaScript/TypeScript expressions directly inside the file and displays runtime values inline.

Useful for quickly testing a function without creating a separate test file.

---

TypeScript Environment

The local environment uses:

Component	Version
TypeScript	5.7.3
Node.js	22.14.0
pnpm	10.15.0

TypeScript targets ES2024 with:

--alwaysStrict
--strictBindCallApply
--strictFunctionTypes
--target ES2024

VS Code is configured to use the repository's local TypeScript installation:

"js/ts.tsdk.path": "node_modules\\typescript\\lib"

---

Dependencies

The dependencies available to LeetCode solutions are pinned to exact versions.

Lodash

"lodash": "4.17.21"

LeetCode provides Lodash as _ globally. This repository therefore declares the global for TypeScript in global.d.ts:

import type lodash from "lodash";

declare global {
  const _: typeof lodash;
}

This allows:

_.isEqual(a, b);

without importing Lodash in the solution.

datastructures-js

The following versions are included:

@datastructures-js/binary-search-tree   5.4.0
@datastructures-js/deque                1.0.8
@datastructures-js/graph                5.3.1
@datastructures-js/heap                 4.3.7
@datastructures-js/linked-list          6.1.4
@datastructures-js/priority-queue       6.3.5
@datastructures-js/queue                4.3.0
@datastructures-js/set                  4.2.2
@datastructures-js/stack                3.1.6
@datastructures-js/trie                 4.2.3

Documentation:

https://datastructures-js.info/docs

For Binary Search Tree, Trie, and Graph, import the package manually when required because some of their exported names can conflict with names used by LeetCode problems.

For example:

import h from "@datastructures-js/heap";

const { MinHeap } = h;

or:

import bst from "@datastructures-js/binary-search-tree";

const { BinarySearchTree } = bst;

---

License

MIT