typescript▌
pproenca/dot-skills · updated Apr 8, 2026
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45 TypeScript optimization rules across type system, compiler config, async patterns, and module organization.
- ›Covers 8 priority-ranked categories from type system performance and compiler configuration (CRITICAL impact) down to advanced patterns, with quantified performance gains (30-90% faster builds, 2-5× type resolution improvements)
- ›Includes explicit rules for tsconfig.json optimization, async/await patterns, module organization, and type safety with measurable outcomes (e.g., \"50
TypeScript Best Practices
Comprehensive performance optimization guide for TypeScript applications. Contains 45 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.
When to Apply
Reference these guidelines when:
- Configuring tsconfig.json for a new or existing project
- Writing complex type definitions or generics
- Optimizing async/await patterns and data fetching
- Organizing modules and managing imports
- Reviewing code for compilation or runtime performance
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Type System Performance | CRITICAL | type- |
| 2 | Compiler Configuration | CRITICAL | tscfg- |
| 3 | Async Patterns | HIGH | async- |
| 4 | Module Organization | HIGH | module- |
| 5 | Type Safety Patterns | MEDIUM-HIGH | safety- |
| 6 | Memory Management | MEDIUM | mem- |
| 7 | Runtime Optimization | LOW-MEDIUM | runtime- |
| 8 | Advanced Patterns | LOW | advanced- |
Table of Contents
- Type System Performance — CRITICAL
- 1.1 Add Explicit Return Types to Exported Functions — CRITICAL (30-50% faster declaration emit)
- 1.2 Avoid Deeply Nested Generic Types — CRITICAL (prevents exponential instantiation cost)
- 1.3 Avoid Large Union Types — CRITICAL (quadratic O(n²) comparison cost)
- 1.4 Extract Conditional Types to Named Aliases — CRITICAL (enables compiler caching, prevents re-evaluation)
- 1.5 Limit Type Recursion Depth — HIGH (prevents exponential type expansion when applicable)
- 1.6 Prefer Interfaces Over Type Intersections — CRITICAL (2-5× faster type resolution)
- 1.7 Simplify Complex Mapped Types — HIGH (reduces type computation by 50-80% when applicable)
- Compiler Configuration — CRITICAL
- 2.1 Configure Include and Exclude Properly — CRITICAL (prevents scanning thousands of unnecessary files)
- 2.2 Enable Incremental Compilation — CRITICAL (50-90% faster rebuilds)
- 2.3 Enable isolatedDeclarations for Parallel Declaration Emit — CRITICAL (enables parallel .d.ts generation without type-checker)
- 2.4 Enable skipLibCheck for Faster Builds — CRITICAL (20-40% faster compilation)
- 2.5 Enable strictFunctionTypes for Faster Variance Checks — CRITICAL (enables optimized variance checking)
- 2.6 Use erasableSyntaxOnly for Node.js Native TypeScript — HIGH (prevents 100% of Node.js type-stripping runtime errors)
- 2.7 Use isolatedModules for Single-File Transpilation — CRITICAL (80-90% faster transpilation with bundlers)
- 2.8 Use Project References for Large Codebases — CRITICAL (60-80% faster incremental builds)
- Async Patterns — HIGH
- 3.1 Annotate Async Function Return Types — HIGH (prevents runtime errors, improves inference)
- 3.2 Avoid await Inside Loops — HIGH (N× faster for N iterations, 10 users = 10× improvement)
- 3.3 Avoid Unnecessary async/await — HIGH (eliminates trivial Promise wrappers and improves stack traces)
- 3.4 Defer await Until Value Is Needed — HIGH (enables implicit parallelization)
- 3.5 Use Promise.all for Independent Operations — HIGH (2-10× improvement in I/O-bound code)
- Module Organization — HIGH
- 4.1 Avoid Barrel File Imports — HIGH (200-800ms import cost, 30-50% larger bundles)
- 4.2 Avoid Circular Dependencies — HIGH (prevents runtime undefined errors and slow compilation)
- 4.3 Control @types Package Inclusion — HIGH (prevents type conflicts and reduces memory usage)
- 4.4 Use Dynamic Imports for Large Modules — HIGH (reduces initial bundle by 30-70%)
- 4.5 Use Type-Only Imports for Types — HIGH (eliminates runtime imports for type information)
- Type Safety Patterns — MEDIUM-HIGH
- 5.1 Enable noUncheckedIndexedAccess — MEDIUM-HIGH (prevents 100% of unchecked index access errors at compile time)
- 5.2 Enable strictNullChecks — MEDIUM-HIGH (prevents null/undefined runtime errors)
- 5.3 Prefer unknown Over any — MEDIUM-HIGH (forces type narrowing, prevents runtime errors)
- 5.4 Use Assertion Functions for Validation — MEDIUM-HIGH (reduces validation boilerplate by 50-70%)
- 5.5 Use const Assertions for Literal Types — MEDIUM-HIGH (preserves literal types, enables better inference)
- 5.6 Use Exhaustive Checks for Union Types — MEDIUM-HIGH (prevents 100% of missing case errors at compile time)
- 5.7 Use Type Guards for Runtime Type Checking — MEDIUM-HIGH (eliminates type assertions, catches errors at boundaries)
- Memory Management — MEDIUM
- 6.1 Avoid Closure Memory Leaks — MEDIUM (prevents retained references in long-lived callbacks)
- 6.2 Avoid Global State Accumulation — MEDIUM (prevents unbounded memory growth)
- 6.3 Clean Up Event Listeners — MEDIUM (prevents unbounded memory growth)
- 6.4 Clear Timers and Intervals — MEDIUM (prevents callback retention and repeated execution)
- 6.5 Use WeakMap for Object Metadata — MEDIUM (prevents memory leaks, enables automatic cleanup)
- Runtime Optimization — LOW-MEDIUM
- 7.1 Avoid Object Spread in Hot Loops — LOW-MEDIUM (reduces object allocations by N×)
- 7.2 Cache Property Access in Loops — LOW-MEDIUM (reduces property lookups by N× in hot paths)
- 7.3 Prefer Native Array Methods Over Lodash — LOW-MEDIUM (eliminates library overhead, enables tree-shaking)
- 7.4 Use for-of for Simple Iteration — LOW-MEDIUM (reduces iteration boilerplate by 30-50%)
- 7.5 Use Modern String Methods — LOW-MEDIUM (2-5× faster than regex for simple patterns)
- 7.6 Use Set/Map for O(1) Lookups — LOW-MEDIUM (O(n) to O(1) per lookup)
- Advanced Patterns — LOW
- 8.1 Use Branded Types for Type-Safe IDs — LOW (prevents mixing incompatible ID types)
- 8.2 Use satisfies for Type Validation with Inference — LOW (prevents property access errors, enables 100% autocomplete accuracy)
- 8.3 Use Template Literal Types for String Patterns — LOW (prevents 100% of string format errors at compile time)
References
How to use typescript on Cursor
AI-first code editor with Composer
Prerequisites
Before installing skills in Cursor, ensure your development environment meets these requirements:
- ›Cursor installed and configured on your development machine
- ›Node.js version 16.0+ with npm package manager (verify with
node --version) - ›Active project directory or workspace where you want to add typescript
Execute installation command
Execute the skills CLI command in your project's root directory to begin installation:
The skills CLI fetches typescript from GitHub repository pproenca/dot-skills and configures it for Cursor.
Select Cursor when prompted
The CLI will show a list of available agents. Use arrow keys to navigate and space to select Cursor:
Verify installation
Confirm successful installation by checking the skill directory location:
Reload or restart Cursor to activate typescript. Access the skill through slash commands (e.g., /typescript) or your agent's skill management interface.
Security & Verification Notice
We perform automated surface-level scans (Gen AI Scanner, Socket, Snyk) during installation. These checks detect common vulnerabilities but do not guarantee complete security. Always review skill source code and verify the publisher's reputation before production use.
Skills execute code in your development environment. Always verify the publisher's identity, review recent commits, and test in isolated environments before production deployment.
List & Monetize Your Skill
Submit your Claude Code skill and start earning
Use Cases▌
Task Automation & Efficiency
Automate repetitive workflows and reduce manual effort
Example
Generate reports, summarize documents, draft communications
Save 3-5 hours per week on routine tasks
Knowledge Enhancement
Learn new skills, understand complex topics, get expert guidance
Example
Explain concepts, provide examples, suggest learning resources
Accelerate learning and skill development by 2x
Quality Improvement
Enhance output quality through reviews, suggestions, and refinements
Example
Review drafts, suggest improvements, catch errors
Improve work quality by 30-40% with less effort
Implementation Guide▌
Prerequisites
- ›Claude Desktop or compatible AI client with skill support
- ›Clear understanding of task or problem to solve
- ›Willingness to iterate and refine outputs
Time Estimate
15-45 minutes depending on use case complexity
Installation Steps
- 1.Install skill using provided installation command
- 2.Test with simple use case relevant to your work
- 3.Evaluate output quality and relevance
- 4.Iterate on prompts to improve results
- 5.Integrate into regular workflow if valuable
Common Pitfalls
- ⚠Expecting perfect results without iteration
- ⚠Not providing enough context in prompts
- ⚠Using skill for tasks outside its intended scope
- ⚠Accepting outputs without review and validation
Best Practices▌
✓ Do
- +Start with clear, specific prompts
- +Provide relevant context and constraints
- +Review and refine all outputs before using
- +Iterate to improve output quality
- +Document successful prompt patterns
✗ Don't
- −Don't use without understanding skill limitations
- −Don't skip validation of outputs
- −Don't share sensitive information in prompts
- −Don't expect skill to replace human judgment
💡 Pro Tips
- ★Be specific about desired format and style
- ★Ask for multiple options to choose from
- ★Request explanations to understand reasoning
- ★Combine AI efficiency with human expertise
When to Use This▌
✓ Use When
Use when skill capabilities match your task, clear ROI on time saved, and you can validate outputs. Best for repetitive tasks, learning, and quality improvement.
✗ Avoid When
Avoid when task requires deep expertise you can't validate, involves sensitive decisions, or when learning process is more valuable than speed of completion.
Learning Path▌
- 1Familiarize yourself with skill capabilities and limitations
- 2Start with low-risk, non-critical tasks
- 3Progress to more complex and valuable use cases
- 4Build expertise through regular use and experimentation
Discussion
Product Hunt–style comments (not star reviews)- No comments yet — start the thread.
Ratings
4.6★★★★★45 reviews- ★★★★★Noor Gupta· Dec 16, 2024
Useful defaults in typescript — fewer surprises than typical one-off scripts, and it plays nicely with `npx skills` flows.
- ★★★★★Dhruvi Jain· Dec 12, 2024
I recommend typescript for anyone iterating fast on agent tooling; clear intent and a small, reviewable surface area.
- ★★★★★Arjun Chen· Dec 4, 2024
Keeps context tight: typescript is the kind of skill you can hand to a new teammate without a long onboarding doc.
- ★★★★★Camila Gonzalez· Nov 23, 2024
typescript fits our agent workflows well — practical, well scoped, and easy to wire into existing repos.
- ★★★★★Li Jackson· Nov 23, 2024
We added typescript from the explainx registry; install was straightforward and the SKILL.md answered most questions upfront.
- ★★★★★Noor Chen· Nov 7, 2024
I recommend typescript for anyone iterating fast on agent tooling; clear intent and a small, reviewable surface area.
- ★★★★★Oshnikdeep· Nov 3, 2024
Useful defaults in typescript — fewer surprises than typical one-off scripts, and it plays nicely with `npx skills` flows.
- ★★★★★Emma Ramirez· Oct 26, 2024
typescript reduced setup friction for our internal harness; good balance of opinion and flexibility.
- ★★★★★Ganesh Mohane· Oct 22, 2024
typescript is among the better-maintained entries we tried; worth keeping pinned for repeat workflows.
- ★★★★★Anika Ndlovu· Oct 14, 2024
Registry listing for typescript matched our evaluation — installs cleanly and behaves as described in the markdown.
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