n4s

library6.2.1jsnpmunverified

n4s is a typed schema validation library (v6.2.1) built as a typed version of 'enforce' for the Vest testing framework ecosystem. It provides compile-time type inference and runtime validation using a chained API. Unlike alternatives like Zod or Yup, n4s is tightly integrated with Vest and follows a similar syntax. Released sporadically, it focuses on small bundle size and TypeScript-first design. Key differentiator: seamless validation integration within Vest test suites.

testing

npm install n4s

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · N4S

n4s

testingjavascriptv6.2.1

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

n4s

✓ import n4s from 'n4s';

✗ import { n4s } from 'n4s';

Default export, not named.

enforce

✓ import { enforce } from 'n4s';

✗ import enforce from 'n4s';

Named export for legacy compatibility.

N4sTypes

✓ import type { N4sTypes } from 'n4s';

✗ import { N4sTypes } from 'n4s';

Type-only import for TypeScript.

Shows basic validation using n4s chained schema and test method.

import n4s from 'n4s'; const schema = n4s.number().gte(0).lte(100); const value = 50; const result = schema.test(value); console.log(result); // { valid: true, message: '', value: 50 } const invalid = -1; console.log(schema.test(invalid)); // { valid: false, message: 'value must be greater than or equal to 0', value: -1 }

Debug

Known issues

breakingv6 changed default export from enforce to n4s; enforce is now a named export.

fix

Use import n4s from 'n4s' instead of import enforce from 'n4s'.

affects: >=6.0.0

deprecated.isRequired() is deprecated in v6; use .required() instead.

fix

Replace .isRequired() with .required().

affects: >=6.0.0

gotchaValidation returns an object with { valid, message, value }, not a boolean.

fix

Check result.valid rather than passing result directly as a boolean.

affects: >=6.0.0

gotchaString schema .equals() compares case-sensitively by default; use .equalsIgnoreCase() for case-insensitive.

fix

Use .equalsIgnoreCase() for case-insensitive comparison.

affects: >=6.0.0

deprecated.notEmpty() is deprecated in v6; use .required() for strings.

fix

Replace .notEmpty() with .required().

affects: >=6.0.0

Errors

Common errors & fixes

TypeError: n4s is not a function

Incorrect import: using named import instead of default.

fix

Use import n4s from 'n4s' instead of import { n4s } from 'n4s'.

Property 'test' does not exist on type 'typeof import...'

Using enforce default import (old version) which returns a function, not a schema object.

fix

Upgrade to v6 and use import n4s from 'n4s'.

Module '"n4s"' has no exported member 'enforce'.

Using named import for enforce in version <6 where enforce was the default export.

fix

Use import enforce from 'n4s' for v5 or use import n4s from 'n4s' for v6.

Upgrade

Version history

6.2.1latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

6 hits · last 30 days

node

Resources

githubhttps://github.com/ealush/vest ↗

packagen4s ↗

homepagehttps://github.com/ealush/vest#readme ↗