aiskillstore/typescript-strict
skills/barnhardt-enterprises-inc/typescript-strict/SKILL.md
Strict TypeScript rules. Use when writing ANY TypeScript.
$ install --global
skillsauthnpx skillsauth add aiskillstore/marketplace typescript-strictInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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TrivyContainer and dependency vulnerability scanner
95%
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SemgrepStatic code analysis for vulnerabilities
95%
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mcp-scan (Snyk)Model Context Protocol security validation
95%
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Snyk (dep)Open source security scanning
50%
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50%
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Last scanned: Mar 31, 2026, 2:04 AM64.4s2 files scanned
SKILL.md
- name:
- typescript-strict
- description:
- Strict TypeScript rules. Use when writing ANY TypeScript.
Strict TypeScript Standards
Rules
1. NO any
// NEVER
function process(data: any) {}
// CORRECT
function process(data: unknown) {
if (isValidData(data)) { /* use data */ }
}
2. Explicit Returns
// NEVER
function getUser(id: string) { return db.find(id); }
// CORRECT
function getUser(id: string): Promise<User | null> { return db.find(id); }
3. Typed Errors
// NEVER
catch (e) { console.log(e.message); }
// CORRECT
catch (error: unknown) {
if (error instanceof AppError) { logger.error(error.message); }
else if (error instanceof Error) { logger.error(error.message); }
else { logger.error('Unknown error', { error }); }
}
4. No Unexplained Assertions
// NEVER
const user = users.find(u => u.id === id)!;
// CORRECT
const user = users.find(u => u.id === id);
if (!user) throw new NotFoundError(`User ${id} not found`);
5. Prefer Type Inference Where Obvious
// Unnecessary - type is inferred
const count: number = 5;
// Good - type is inferred
const count = 5;
// Good - explicit for function signatures
function add(a: number, b: number): number {
return a + b;
}
6. Use Discriminated Unions
// CORRECT
type Result<T> =
| { success: true; data: T }
| { success: false; error: string };
function handle(result: Result<User>) {
if (result.success) {
// TypeScript knows result.data exists
console.log(result.data.name);
} else {
// TypeScript knows result.error exists
console.log(result.error);
}
}
Quick Reference
| Pattern | Status |
|---------|--------|
| any | NEVER |
| Implicit return | NEVER |
| ! without comment | NEVER |
| // @ts-ignore | NEVER |
| as casting | MINIMIZE |
| unknown + guards | PREFERRED |
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