feat(ArrayValidator): add length ranges

README.md

@@ -201,7 +201,7 @@ const stringArray = s.array(s.string);
 const stringArray = s.string.array;
 ```
 
-ShapeShift includes a handful of string-specific validations:
+ShapeShift includes a handful of array-specific validations:
 
 ```typescript
 s.string.array.lengthLt(5); // Must have less than 5 elements
@@ -210,6 +210,9 @@ s.string.array.lengthGt(5); // Must have more than 5 elements
 s.string.array.lengthGe(5); // Must have 5 or more elements
 s.string.array.lengthEq(5); // Must have exactly 5 elements
 s.string.array.lengthNe(5); // Must not have exactly 5 elements
+s.string.array.lengthRange(0, 4); // Must have at least 0 elements and less than 4 elements (in math, that is [0, 4))
+s.string.array.lengthRangeInclusive(0, 4); // Must have at least 0 elements and at most 4 elements (in math, that is [0, 4])
+s.string.array.lengthRangeExclusive(0, 4); // Must have more than 0 element and less than 4 elements (in math, that is [firstNumber + 1, 4))
 ```
 
 > **Note**: All `.length` methods define tuple types with the given amount of elements. For example, `s.string.array.lengthGe(2)`'s inferred type is `[string, string, ...string[]]`

src/constraints/ArrayLengthConstraints.ts

@@ -3,7 +3,7 @@ import { Result } from '../lib/Result';
 import type { IConstraint } from './base/IConstraint';
 import { Comparator, eq, ge, gt, le, lt, ne } from './util/operators';
 
-export type ArrayConstraintName = `s.array(T).length${'Lt' | 'Le' | 'Gt' | 'Ge' | 'Eq' | 'Ne'}`;
+export type ArrayConstraintName = `s.array(T).length${'Lt' | 'Le' | 'Gt' | 'Ge' | 'Eq' | 'Ne' | 'Range' | 'RangeInclusive' | 'RangeExclusive'}`;
 
 function arrayLengthComparator<T>(comparator: Comparator, name: ArrayConstraintName, expected: string, length: number): IConstraint<T[]> {
 	return {
@@ -44,3 +44,36 @@ export function arrayLengthNe<T>(value: number): IConstraint<T[]> {
 	const expected = `expected.length !== ${value}`;
 	return arrayLengthComparator(ne, 's.array(T).lengthNe', expected, value);
 }
+
+export function arrayLengthRange<T>(start: number, endBefore: number): IConstraint<T[]> {
+	const expected = `expected.length >= ${start} && expected.length < ${endBefore}`;
+	return {
+		run(input: T[]) {
+			return input.length >= start && input.length < endBefore //
+				? Result.ok(input)
+				: Result.err(new ConstraintError('s.array(T).lengthRange', 'Invalid Array length', input, expected));
+		}
+	};
+}
+
+export function arrayLengthRangeInclusive<T>(start: number, end: number): IConstraint<T[]> {
+	const expected = `expected.length >= ${start} && expected.length <= ${end}`;
+	return {
+		run(input: T[]) {
+			return input.length >= start && input.length <= end //
+				? Result.ok(input)
+				: Result.err(new ConstraintError('s.array(T).lengthRangeInclusive', 'Invalid Array length', input, expected));
+		}
+	};
+}
+
+export function arrayLengthRangeExclusive<T>(startAfter: number, endBefore: number): IConstraint<T[]> {
+	const expected = `expected.length > ${startAfter} && expected.length < ${endBefore}`;
+	return {
+		run(input: T[]) {
+			return input.length > startAfter && input.length < endBefore //
+				? Result.ok(input)
+				: Result.err(new ConstraintError('s.array(T).lengthRangeExclusive', 'Invalid Array length', input, expected));
+		}
+	};
+}

src/constraints/StringConstraints.ts

@@ -1,9 +1,9 @@
+import { isIP, isIPv4, isIPv6 } from 'node:net';
 import { ConstraintError } from '../lib/errors/ConstraintError';
 import { Result } from '../lib/Result';
 import type { IConstraint } from './base/IConstraint';
-import { Comparator, eq, ge, gt, le, lt, ne } from './util/operators';
-import { isIP, isIPv4, isIPv6 } from 'node:net';
 import { validateEmail } from './util/emailValidator';
+import { Comparator, eq, ge, gt, le, lt, ne } from './util/operators';
 
 export type StringConstraintName =
 	| `s.string.${`length${'Lt' | 'Le' | 'Gt' | 'Ge' | 'Eq' | 'Ne'}` | 'regex' | 'url' | 'uuid' | 'email' | `ip${'v4' | 'v6' | ''}`}`;

src/constraints/type-exports.ts

@@ -5,10 +5,12 @@ export type {
 	arrayLengthGt,
 	arrayLengthLe,
 	arrayLengthLt,
-	arrayLengthNe
+	arrayLengthNe,
+	arrayLengthRange,
+	arrayLengthRangeInclusive
 } from './ArrayLengthConstraints';
 export type { IConstraint } from './base/IConstraint';
-export type { BigIntConstraintName, bigintEq, bigintGe, bigintGt, bigintLe, bigintLt, bigintNe, bigintDivisibleBy } from './BigIntConstraints';
+export type { BigIntConstraintName, bigintDivisibleBy, bigintEq, bigintGe, bigintGt, bigintLe, bigintLt, bigintNe } from './BigIntConstraints';
 export type { BooleanConstraintName, booleanFalse, booleanTrue } from './BooleanConstraints';
 export type { DateConstraintName, dateEq, dateGe, dateGt, dateInvalid, dateLe, dateLt, dateNe, dateValid } from './DateConstraints';
 export type {
@@ -28,17 +30,17 @@ export type {
 } from './NumberConstraints';
 export type {
 	StringConstraintName,
-	StringProtocol,
 	StringDomain,
-	UrlOptions,
+	stringEmail,
+	stringIp,
 	stringLengthEq,
 	stringLengthGe,
 	stringLengthGt,
 	stringLengthLe,
 	stringLengthLt,
 	stringLengthNe,
-	stringEmail,
+	StringProtocol,
 	stringRegex,
 	stringUrl,
-	stringIp
+	UrlOptions
 } from './StringConstraints';

src/index.ts

@@ -9,6 +9,5 @@ export * from './lib/errors/ExpectedValidationError';
 export * from './lib/errors/MissingPropertyError';
 export * from './lib/errors/UnknownPropertyError';
 export * from './lib/errors/ValidationError';
-
 export * from './lib/Result';
 export * from './type-exports';

src/validators/ArrayValidator.ts

@@ -1,4 +1,14 @@
-import { arrayLengthEq, arrayLengthGe, arrayLengthGt, arrayLengthLe, arrayLengthLt, arrayLengthNe } from '../constraints/ArrayLengthConstraints';
+import {
+	arrayLengthEq,
+	arrayLengthGe,
+	arrayLengthGt,
+	arrayLengthLe,
+	arrayLengthLt,
+	arrayLengthNe,
+	arrayLengthRange,
+	arrayLengthRangeExclusive,
+	arrayLengthRangeInclusive
+} from '../constraints/ArrayLengthConstraints';
 import type { IConstraint } from '../constraints/base/IConstraint';
 import type { BaseError } from '../lib/errors/BaseError';
 import { CombinedPropertyError } from '../lib/errors/CombinedPropertyError';
@@ -19,23 +29,44 @@ export class ArrayValidator<T> extends BaseValidator<T[]> {
 	}
 
 	public lengthLe<N extends number>(length: N): BaseValidator<ExpandSmallerTuples<[...Tuple<T, N>]>> {
-		return this.addConstraint(arrayLengthLe(length) as IConstraint<T[]>) as any;
+		return this.addConstraint(arrayLengthLe(length)) as any;
 	}
 
 	public lengthGt<N extends number>(length: N): BaseValidator<[...Tuple<T, N>, T, ...T[]]> {
-		return this.addConstraint(arrayLengthGt(length) as IConstraint<T[]>) as any;
+		return this.addConstraint(arrayLengthGt(length)) as any;
 	}
 
 	public lengthGe<N extends number>(length: N): BaseValidator<[...Tuple<T, N>, ...T[]]> {
-		return this.addConstraint(arrayLengthGe(length) as IConstraint<T[]>) as any;
+		return this.addConstraint(arrayLengthGe(length)) as any;
 	}
 
 	public lengthEq<N extends number>(length: N): BaseValidator<[...Tuple<T, N>]> {
-		return this.addConstraint(arrayLengthEq(length) as IConstraint<T[]>) as any;
+		return this.addConstraint(arrayLengthEq(length)) as any;
 	}
 
 	public lengthNe(length: number): BaseValidator<[...T[]]> {
-		return this.addConstraint(arrayLengthNe(length) as IConstraint<T[]>);
+		return this.addConstraint(arrayLengthNe(length)) as any;
+	}
+
+	public lengthRange<S extends number, E extends number>(
+		start: S,
+		endBefore: E
+	): BaseValidator<Exclude<ExpandSmallerTuples<UnshiftTuple<[...Tuple<T, E>]>>, ExpandSmallerTuples<UnshiftTuple<[...Tuple<T, S>]>>>> {
+		return this.addConstraint(arrayLengthRange(start, endBefore)) as any;
+	}
+
+	public lengthRangeInclusive<S extends number, E extends number>(
+		startAt: S,
+		endAt: E
+	): BaseValidator<Exclude<ExpandSmallerTuples<[...Tuple<T, E>]>, ExpandSmallerTuples<UnshiftTuple<[...Tuple<T, S>]>>>> {
+		return this.addConstraint(arrayLengthRangeInclusive(startAt, endAt)) as any;
+	}
+
+	public lengthRangeExclusive<S extends number, E extends number>(
+		startAfter: S,
+		endBefore: E
+	): BaseValidator<Exclude<ExpandSmallerTuples<UnshiftTuple<[...Tuple<T, E>]>>, ExpandSmallerTuples<[...Tuple<T, S>]>>> {
+		return this.addConstraint(arrayLengthRangeExclusive(startAfter, endBefore)) as any;
 	}
 
 	protected override clone(): this {

src/validators/BaseValidator.ts

@@ -4,7 +4,7 @@ import type { CombinedError } from '../lib/errors/CombinedError';
 import type { CombinedPropertyError } from '../lib/errors/CombinedPropertyError';
 import type { ValidationError } from '../lib/errors/ValidationError';
 import { Result } from '../lib/Result';
-import { ArrayValidator, LiteralValidator, NullishValidator, SetValidator, UnionValidator, DefaultValidator } from './imports';
+import { ArrayValidator, DefaultValidator, LiteralValidator, NullishValidator, SetValidator, UnionValidator } from './imports';
 
 export abstract class BaseValidator<T> {
 	protected constraints: readonly IConstraint<T>[] = [];

src/validators/BigIntValidator.ts

@@ -1,5 +1,5 @@
 import type { IConstraint } from '../constraints/base/IConstraint';
-import { bigintEq, bigintGe, bigintGt, bigintLe, bigintLt, bigintNe, bigintDivisibleBy } from '../constraints/BigIntConstraints';
+import { bigintDivisibleBy, bigintEq, bigintGe, bigintGt, bigintLe, bigintLt, bigintNe } from '../constraints/BigIntConstraints';
 import { ValidationError } from '../lib/errors/ValidationError';
 import { Result } from '../lib/Result';
 import { BaseValidator } from './imports';

src/validators/TupleValidator.ts

@@ -1,9 +1,9 @@
-import { BaseValidator } from './imports';
-import { Result } from '../lib/Result';
-import { ValidationError } from '../lib/errors/ValidationError';
-import { CombinedPropertyError } from '../lib/errors/CombinedPropertyError';
 import type { IConstraint } from '../constraints/base/IConstraint';
 import type { BaseError } from '../lib/errors/BaseError';
+import { CombinedPropertyError } from '../lib/errors/CombinedPropertyError';
+import { ValidationError } from '../lib/errors/ValidationError';
+import { Result } from '../lib/Result';
+import { BaseValidator } from './imports';
 
 export class TupleValidator<T extends any[]> extends BaseValidator<[...T]> {
 	private readonly validators: BaseValidator<[...T]>[] = [];

tests/validators/array.test.ts

@@ -30,12 +30,7 @@ describe('ArrayValidator', () => {
 				expect<[string] | []>(lengthLtPredicate.parse(value)).toEqual(value);
 			});
 
-			test.each([
-				[
-					['Hello', 'there'],
-					['foo', 'bar', 'baaz']
-				]
-			])('GIVEN %p THEN throws ConstraintError', (value) => {
+			test.each([[['Hello', 'there']], [['foo', 'bar', 'baaz']]])('GIVEN %p THEN throws ConstraintError', (value) => {
 				expectError(
 					() => lengthLtPredicate.parse(value),
 					new ConstraintError('s.array(T).lengthLt', 'Invalid Array length', value, 'expected.length < 2')
@@ -46,7 +41,7 @@ describe('ArrayValidator', () => {
 		describe('lengthLe', () => {
 			const lengthLePredicate = s.string.array.lengthLe(2);
 
-			test.each([[['Hello'], ['Hello', 'there']]])('GIVEN %p THEN returns given value', (value) => {
+			test.each([[['Hello']], [['Hello', 'there']]])('GIVEN %p THEN returns given value', (value) => {
 				expect<[string, string] | [string] | []>(lengthLePredicate.parse(value)).toEqual(value);
 			});
 
@@ -65,7 +60,7 @@ describe('ArrayValidator', () => {
 				expect<[string, string, string, ...string[]]>(lengthGtPredicate.parse(value)).toEqual(value);
 			});
 
-			test.each([[['Hello'], []]])('GIVEN %p THEN throws ConstraintError', (value) => {
+			test.each([[['Hello']], [[]]])('GIVEN %p THEN throws ConstraintError', (value) => {
 				expectError(
 					() => lengthGtPredicate.parse(value),
 					new ConstraintError('s.array(T).lengthGt', 'Invalid Array length', value, 'expected.length > 2')
@@ -76,16 +71,11 @@ describe('ArrayValidator', () => {
 		describe('lengthGe', () => {
 			const lengthGePredicate = s.string.array.lengthGe(2);
 
-			test.each([
-				[
-					['Hello', 'there'],
-					['foo', 'bar', 'baaz']
-				]
-			])('GIVEN %p THEN returns given value', (value) => {
+			test.each([[['Hello', 'there']], [['foo', 'bar', 'baaz']]])('GIVEN %p THEN returns given value', (value) => {
 				expect<[string, string, ...string[]]>(lengthGePredicate.parse(value)).toEqual(value);
 			});
 
-			test.each([[[], ['foo']]])('GIVEN %p THEN throws ConstraintError', (value) => {
+			test.each([[[]], [['foo']]])('GIVEN %p THEN throws ConstraintError', (value) => {
 				expectError(
 					() => lengthGePredicate.parse(value),
 					new ConstraintError('s.array(T).lengthGe', 'Invalid Array length', value, 'expected.length >= 2')
@@ -100,7 +90,7 @@ describe('ArrayValidator', () => {
 				expect<[string, string]>(lengthPredicate.parse(value)).toEqual(value);
 			});
 
-			test.each([[[], ['Hello']]])('GIVEN %p THEN throws ConstraintError', (value) => {
+			test.each([[[]], [['Hello']]])('GIVEN %p THEN throws ConstraintError', (value) => {
 				expectError(
 					() => lengthPredicate.parse(value),
 					new ConstraintError('s.array(T).lengthEq', 'Invalid Array length', value, 'expected.length === 2')
@@ -111,22 +101,75 @@ describe('ArrayValidator', () => {
 		describe('lengthNe', () => {
 			const lengthNotEqPredicate = s.string.array.lengthNe(2);
 
-			test.each([[['foo', 'bar', 'baaz'], ['foo']]])('GIVEN %p THEN returns given value', (value) => {
+			test.each([[['foo', 'bar', 'baaz']], [['foo']]])('GIVEN %p THEN returns given value', (value) => {
 				expect<string[]>(lengthNotEqPredicate.parse(value)).toEqual(value);
 			});
 
-			test.each([
-				[
-					['Hello', 'there'],
-					['foo', 'bar']
-				]
-			])('GIVEN %p THEN throws ConstraintError', (value) => {
+			test.each([[['Hello', 'there']], [['foo', 'bar']]])('GIVEN %p THEN throws ConstraintError', (value) => {
 				expectError(
 					() => lengthNotEqPredicate.parse(value),
 					new ConstraintError('s.array(T).lengthNe', 'Invalid Array length', value, 'expected.length !== 2')
 				);
 			});
 		});
+
+		describe('lengthRange', () => {
+			const lengthRangePredicate = s.string.array.lengthRange(0, 2);
+
+			test.each([[[] as string[]], [['foo']]])('GIVEN %p THEN returns given value', (value) => {
+				expect<[] | [string]>(lengthRangePredicate.parse(value)).toEqual(value);
+			});
+
+			test.each([[['hewwo', 'there']]])('GIVEN %p THEN throws ConstraintError', (value) => {
+				expectError(
+					() => lengthRangePredicate.parse(value),
+					new ConstraintError('s.array(T).lengthRange', 'Invalid Array length', value, 'expected.length >= 0 && expected.length < 2')
+				);
+			});
+		});
+
+		describe('lengthRangeInclusive', () => {
+			const lengthRangeInclusivePredicate = s.string.array.lengthRangeInclusive(0, 2);
+
+			test.each([[[] as string[]], [['foo']], [['hewwo', 'there']]])('GIVEN %p THEN returns given value', (value) => {
+				expect<[] | [string] | [string, string]>(lengthRangeInclusivePredicate.parse(value)).toEqual(value);
+			});
+
+			test.each([[['hewwo', 'there', 'buddy']]])('GIVEN %p THEN throws ConstraintError', (value) => {
+				expectError(
+					() => lengthRangeInclusivePredicate.parse(value),
+					new ConstraintError(
+						's.array(T).lengthRangeInclusive',
+						'Invalid Array length',
+						value,
+						'expected.length >= 0 && expected.length <= 2'
+					)
+				);
+			});
+
+			describe('lengthRangeExclusive', () => {
+				const lengthRangeExclusivePredicate = s.string.array.lengthRangeExclusive(0, 2);
+
+				test.each([[['foo']]])('GIVEN %p THEN returns given value', (value) => {
+					expect<[string]>(lengthRangeExclusivePredicate.parse(value)).toEqual(value);
+				});
+
+				test.each([[[] as string[]], [['hewwo', 'there']], [['hewwo', 'there', 'buddy']]])(
+					'GIVEN %p THEN throws ConstraintError',
+					(value) => {
+						expectError(
+							() => lengthRangeExclusivePredicate.parse(value),
+							new ConstraintError(
+								's.array(T).lengthRangeExclusive',
+								'Invalid Array length',
+								value,
+								'expected.length > 0 && expected.length < 2'
+							)
+						);
+					}
+				);
+			});
+		});
 	});
 
 	test('GIVEN clone THEN returns similar instance', () => {