Meta tweaks

package.json

@@ -21,6 +21,7 @@
 			"node": "./dev-only.js"
 		}
 	},
+	"sideEffects": false,
 	"engines": {
 		"node": ">=14.16"
 	},
@@ -57,7 +58,7 @@
 		"object"
 	],
 	"dependencies": {
-		"@sindresorhus/is": "^5.1.0",
+		"@sindresorhus/is": "^5.3.0",
 		"callsites": "^4.0.0",
 		"dot-prop": "^7.2.0",
 		"lodash.isequal": "^4.5.0",
@@ -66,22 +67,21 @@
 	"devDependencies": {
 		"@sindresorhus/tsconfig": "^3.0.1",
 		"@types/lodash.isequal": "^4.5.6",
-		"@types/node": "^17.0.42",
+		"@types/node": "^18.8.0",
 		"@types/vali-date": "^1.0.0",
-		"ava": "^4.3.0",
-		"c8": "^7.11.3",
-		"del-cli": "^4.0.1",
-		"expect-type": "^0.13.0",
+		"ava": "^4.3.3",
+		"c8": "^7.12.0",
+		"del-cli": "^5.0.0",
+		"expect-type": "^0.14.2",
 		"gh-pages": "^4.0.0",
-		"ts-node": "^10.8.1",
-		"typedoc": "^0.22.17",
-		"typescript": "^4.7.3",
-		"xo": "^0.50.0"
+		"ts-node": "^10.9.1",
+		"typedoc": "^0.23.15",
+		"typescript": "^4.8.4",
+		"xo": "^0.52.3"
 	},
 	"browser": {
 		"./dist/utils/infer-label.js": "./dist/utils/infer-label.browser.js"
 	},
-	"sideEffects": false,
 	"xo": {
 		"ignores": [
 			"example.js",
@@ -90,13 +90,11 @@
 		],
 		"rules": {
 			"no-useless-return": "off",
-			"ava/no-ignored-test-files": "off",
 			"@typescript-eslint/explicit-function-return-type": "error",
 			"@typescript-eslint/ban-types": "off",
 			"@typescript-eslint/no-explicit-any": "off",
 			"@typescript-eslint/no-empty-function": "off",
-			"@typescript-eslint/restrict-template-expressions": "off",
-			"@typescript-eslint/no-unused-vars": "off"
+			"@typescript-eslint/restrict-template-expressions": "off"
 		}
 	},
 	"ava": {

source/index.ts

@@ -1,8 +1,8 @@
 import callsites from 'callsites';
 import {inferLabel} from './utils/infer-label.js';
-import {BasePredicate, isPredicate} from './predicates/base-predicate.js';
-import modifiers, {Modifiers} from './modifiers.js';
-import predicates, {Predicates} from './predicates.js';
+import {isPredicate, type BasePredicate} from './predicates/base-predicate.js';
+import modifiers, {type Modifiers} from './modifiers.js';
+import predicates, {type Predicates} from './predicates.js';
 import test from './test.js';
 
 /**
@@ -27,7 +27,7 @@ type User = Infer<typeof userPredicate>;
 export type Infer<P> = P extends BasePredicate<infer T> ? T : never;
 
 // Extends is only necessary for the generated documentation to be cleaner. The loaders below infer the correct type.
-export interface Ow extends Modifiers, Predicates {
+export type Ow = {
 	/**
 	Test if the value matches the predicate. Throws an `ArgumentError` if the test fails.
 
@@ -59,12 +59,12 @@ export interface Ow extends Modifiers, Predicates {
 	@param predicate - Predicate used in the validator function.
 	*/
 	create: (<T>(predicate: BasePredicate<T>) => ReusableValidator<T>) & (<T>(label: string, predicate: BasePredicate<T>) => ReusableValidator<T>);
-}
+} & Modifiers & Predicates;
 
 /**
 A reusable validator.
 */
-export interface ReusableValidator<T> {
+export type ReusableValidator<T> = {
 	/**
 	Test if the value matches the predicate. Throws an `ArgumentError` if the test fails.
 
@@ -73,7 +73,7 @@ export interface ReusableValidator<T> {
 	*/
 	// eslint-disable-next-line @typescript-eslint/prefer-function-type, @typescript-eslint/no-redundant-type-constituents
 	(value: unknown | T, label?: string): void;
-}
+};
 
 /**
 Turn a `ReusableValidator` into one with a type assertion.

source/modifiers.ts

@@ -1,18 +1,18 @@
-import predicates, {Predicates} from './predicates.js';
-import {BasePredicate} from './index.js';
+import predicates, {type Predicates} from './predicates.js';
+import type {BasePredicate} from './index.js';
 
 type Optionalify<P> = P extends BasePredicate<infer X>
 	? P & BasePredicate<X | undefined>
 	: P;
 
-export interface Modifiers {
+export type Modifiers = {
 	/**
 	Make the following predicate optional so it doesn't fail when the value is `undefined`.
 	*/
 	readonly optional: {
 		[K in keyof Predicates]: Optionalify<Predicates[K]>
 	};
-}
+};
 
 const modifiers = <T>(object: T): T & Modifiers => {
 	Object.defineProperties(object, {

source/predicates.ts

@@ -1,10 +1,10 @@
 import type {Buffer} from 'node:buffer';
-import {TypedArray} from './typed-array.js';
+import type {TypedArray} from './typed-array.js';
 import {StringPredicate} from './predicates/string.js';
 import {NumberPredicate} from './predicates/number.js';
 import {BigIntPredicate} from './predicates/bigint.js';
 import {BooleanPredicate} from './predicates/boolean.js';
-import {Predicate, PredicateOptions} from './predicates/predicate.js';
+import {Predicate, type PredicateOptions} from './predicates/predicate.js';
 import {ArrayPredicate} from './predicates/array.js';
 import {ObjectPredicate} from './predicates/object.js';
 import {DatePredicate} from './predicates/date.js';
@@ -16,10 +16,10 @@ import {WeakSetPredicate} from './predicates/weak-set.js';
 import {TypedArrayPredicate} from './predicates/typed-array.js';
 import {ArrayBufferPredicate} from './predicates/array-buffer.js';
 import {DataViewPredicate} from './predicates/data-view.js';
-import {BasePredicate} from './predicates/base-predicate.js';
+import type {BasePredicate} from './predicates/base-predicate.js';
 import {AnyPredicate} from './predicates/any.js';
 
-export interface Predicates {
+export type Predicates = {
 	/**
 	Test the value to be a string.
 	*/
@@ -209,7 +209,7 @@ export interface Predicates {
 	& (<T1, T2, T3, T4, T5, T6, T7, T8, T9>(p1: BasePredicate<T1>, p2: BasePredicate<T2>, p3: BasePredicate<T3>, p4: BasePredicate<T4>, p5: BasePredicate<T5>, p6: BasePredicate<T6>, p7: BasePredicate<T7>, p8: BasePredicate<T8>, p9: BasePredicate<T9>) => AnyPredicate<T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9>)
 	& (<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(p1: BasePredicate<T1>, p2: BasePredicate<T2>, p3: BasePredicate<T3>, p4: BasePredicate<T4>, p5: BasePredicate<T5>, p6: BasePredicate<T6>, p7: BasePredicate<T7>, p8: BasePredicate<T8>, p9: BasePredicate<T9>, p10: BasePredicate<T10>) => AnyPredicate<T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9 | T10>)
 	& ((...predicate: BasePredicate[]) => AnyPredicate);
-}
+};
 
 const predicates = <T>(object: T, options?: PredicateOptions): T & Predicates => {
 	Object.defineProperties(object, {

source/predicates/any.ts

@@ -1,8 +1,8 @@
 import {ArgumentError} from '../argument-error.js';
-import {Main} from '../index.js';
+import type {Main} from '../index.js';
 import {generateArgumentErrorMessage} from '../utils/generate-argument-error-message.js';
-import {BasePredicate, testSymbol} from './base-predicate.js';
-import {PredicateOptions} from './predicate.js';
+import {testSymbol, type BasePredicate} from './base-predicate.js';
+import type {PredicateOptions} from './predicate.js';
 
 /**
 @hidden

source/predicates/array.ts

@@ -1,9 +1,9 @@
 import isEqual from 'lodash.isequal';
 import {exact} from '../utils/match-shape.js';
 import ofType from '../utils/of-type.js';
-import {BasePredicate} from './base-predicate.js';
-import {Predicate, PredicateOptions} from './predicate.js';
-import {Shape} from './object.js';
+import type {BasePredicate} from './base-predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
+import type {Shape} from './object.js';
 
 export class ArrayPredicate<T = unknown> extends Predicate<T[]> {
 	/**

source/predicates/base-predicate.ts

@@ -1,4 +1,4 @@
-import {Main} from '../index.js';
+import type {Main} from '../index.js';
 
 /**
 @hidden
@@ -13,6 +13,6 @@ export const isPredicate = (value: unknown): value is BasePredicate => Boolean((
 /**
 @hidden
 */
-export interface BasePredicate<T = unknown> {
+export type BasePredicate<T = unknown> = {
 	[testSymbol](value: T, main: Main, label: string | Function, idLabel?: boolean): void;
-}
+};

source/predicates/bigint.ts

@@ -1,4 +1,4 @@
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class BigIntPredicate extends Predicate<bigint> {
 	/**

source/predicates/boolean.ts

@@ -1,4 +1,4 @@
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class BooleanPredicate extends Predicate<boolean> {
 	/**

source/predicates/data-view.ts

@@ -1,4 +1,4 @@
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class DataViewPredicate extends Predicate<DataView> {
 	/**

source/predicates/date.ts

@@ -1,4 +1,4 @@
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class DatePredicate extends Predicate<Date> {
 	/**

source/predicates/error.ts

@@ -1,4 +1,4 @@
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class ErrorPredicate extends Predicate<Error> {
 	/**

source/predicates/map.ts

@@ -1,7 +1,7 @@
 import isEqual from 'lodash.isequal';
 import hasItems from '../utils/has-items.js';
 import ofType from '../utils/of-type.js';
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class MapPredicate<T1 = unknown, T2 = unknown> extends Predicate<Map<T1, T2>> {
 	/**

source/predicates/number.ts

@@ -1,5 +1,5 @@
 import is from '@sindresorhus/is';
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class NumberPredicate extends Predicate<number> {
 	/**

source/predicates/object.ts

@@ -4,9 +4,9 @@ import isEqual from 'lodash.isequal';
 import hasItems from '../utils/has-items.js';
 import ofType from '../utils/of-type.js';
 import ofTypeDeep from '../utils/of-type-deep.js';
-import {partial, exact, Shape, TypeOfShape} from '../utils/match-shape.js';
-import {Predicate, PredicateOptions} from './predicate.js';
-import {BasePredicate} from './base-predicate.js';
+import {partial, exact, type Shape, type TypeOfShape} from '../utils/match-shape.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
+import type {BasePredicate} from './base-predicate.js';
 
 export class ObjectPredicate<T extends object = object> extends Predicate<T> {
 	/**

source/predicates/predicate.ts

@@ -1,9 +1,9 @@
 import is from '@sindresorhus/is';
 import {ArgumentError} from '../argument-error.js';
 import {not} from '../operators/not.js';
-import {Main} from '../index.js';
+import type {Main} from '../index.js';
 import {generateArgumentErrorMessage} from '../utils/generate-argument-error-message.js';
-import {BasePredicate, testSymbol} from './base-predicate.js';
+import {testSymbol, type BasePredicate} from './base-predicate.js';
 
 /**
 Function executed when the provided validation fails.
@@ -18,7 +18,7 @@ export type ValidatorMessageBuilder<T> = (value: T, label?: string) => string;
 /**
 @hidden
 */
-export interface Validator<T> {
+export type Validator<T> = {
 	message(value: T, label?: string, result?: any): string;
 
 	validator(value: T): unknown;
@@ -29,21 +29,21 @@ export interface Validator<T> {
 	When absent, the return value of `message()` is used and 'not' is inserted after the first 'to', e.g. `Expected 'smth' to be empty` -> `Expected 'smth' to not be empty`.
 	*/
 	negatedMessage?(value: T, label: string): string;
-}
+};
 
 /**
 @hidden
 */
-export interface PredicateOptions {
+export type PredicateOptions = {
 	optional?: boolean;
-}
+};
 
 /**
 @hidden
 */
-export interface Context<T = unknown> extends PredicateOptions {
+export type Context<T = unknown> = {
 	validators: Array<Validator<T>>;
-}
+} & PredicateOptions;
 
 /**
 @hidden

source/predicates/set.ts

@@ -1,7 +1,7 @@
 import isEqual from 'lodash.isequal';
 import hasItems from '../utils/has-items.js';
 import ofType from '../utils/of-type.js';
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class SetPredicate<T = any> extends Predicate<Set<T>> {
 	/**

source/predicates/string.ts

@@ -1,6 +1,6 @@
 import is from '@sindresorhus/is';
 import valiDate from 'vali-date';
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class StringPredicate extends Predicate<string> {
 	/**

source/predicates/typed-array.ts

@@ -1,4 +1,4 @@
-import {TypedArray} from '../typed-array.js';
+import type {TypedArray} from '../typed-array.js';
 import {Predicate} from './predicate.js';
 
 export class TypedArrayPredicate<T extends TypedArray> extends Predicate<T> {

source/predicates/weak-map.ts

@@ -1,5 +1,5 @@
 import hasItems from '../utils/has-items.js';
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class WeakMapPredicate<KeyType extends object = object> extends Predicate<WeakMap<KeyType, unknown>> {
 	/**

source/predicates/weak-set.ts

@@ -1,5 +1,5 @@
 import hasItems from '../utils/has-items.js';
-import {Predicate, PredicateOptions} from './predicate.js';
+import {Predicate, type PredicateOptions} from './predicate.js';
 
 export class WeakSetPredicate<T extends object = object> extends Predicate<WeakSet<T>> {
 	/**

source/test.ts

@@ -1,4 +1,4 @@
-import {testSymbol, BasePredicate} from './predicates/base-predicate.js';
+import {testSymbol, type BasePredicate} from './predicates/base-predicate.js';
 
 /**
 Validate the value against the provided predicate.

source/utils/has-items.ts

@@ -1,9 +1,9 @@
 /**
 @hidden
 */
-export interface CollectionLike<T> {
+export type CollectionLike<T> = {
 	has: (item: T) => boolean;
-}
+};
 
 /**
 Retrieve the missing values in a collection based on an array of items.

source/utils/infer-label.ts

@@ -1,5 +1,5 @@
-import * as fs from 'node:fs';
-import {CallSite} from 'callsites';
+import fs from 'node:fs';
+import type {CallSite} from 'callsites';
 import isValidIdentifier from './is-valid-identifier.js';
 import isNode from './node/is-node.js';
 
@@ -58,7 +58,7 @@ export const inferLabel = (callsites: readonly CallSite[]): void | string => {
 		return;
 	}
 
-	if (isValidIdentifier(token) || isValidIdentifier(token.split('.').pop())) {
+	if (isValidIdentifier(token) || isValidIdentifier(token.split('.').pop() ?? '')) {
 		return token;
 	}
 

source/utils/is-valid-identifier.ts

@@ -16,6 +16,6 @@ Test if the string is a valid JavaScript identifier.
 
 @param string - String to test.
 */
-const isValidIdentifier = (string: string | undefined): string | boolean | undefined => string && !reservedSet.has(string) && identifierRegex.test(string);
+const isValidIdentifier = (string: string): boolean => Boolean(string?.length > 0 && !reservedSet.has(string) && identifierRegex.test(string));
 
 export default isValidIdentifier;