chore: lint

eslint.config.js

@@ -6,7 +6,7 @@ export default [
 	...withStyles(),
 	...configs.license['MPL-2.0'](),
 	{
-		ignores: ['node_modules', 'dist', 'reports', 'eslint.config.js', 'generic-type-guard.*'],
+		ignores: ['node_modules', 'dist', 'reports', 'eslint.config.js', 'generic-type-guard.*', '.stryker-tmp'],
 	},
 	{
 		files: ['*.config.js'],

etc/generic-type-guard.api.md

@@ -38,7 +38,7 @@ export const hasOnlyProperties: <V extends object>(props: MappedTypeGuard<V>) =>
 export const hasOptionalProperties: <V extends object>(props: MappedTypeGuard<V>) => PartialTypeGuard<object, Partial<V>>;
 
 // @public
-export const hasOptionalProperty: <K extends string, V>(property: K, value: TypeGuard<V>) => PartialTypeGuard<object, { [prop in K]?: V; }>;
+export const hasOptionalProperty: <K extends string, V>(property: K, value: TypeGuard<V>) => PartialTypeGuard<object, Partial<Record<K, V>>>;
 
 // @public
 export const hasProperties: <V extends object>(props: MappedTypeGuard<V>) => PartialTypeGuard<object, V>;
@@ -55,13 +55,9 @@ export interface InterfaceBuilder<T extends object> {
     with: <V extends object>(ptv: PartialTypeGuard<object, V>) => InterfaceBuilder<T & V>;
     withNumericIndexSignature: <V>(value: TypeGuard<V>, enforce?: boolean) => InterfaceBuilder<T & Record<number, V>>;
     withOptionalProperties: <V extends object>(props: MappedTypeGuard<V>) => InterfaceBuilder<T & Partial<V>>;
-    withOptionalProperty: <K extends string, V>(key: K, ptv: TypeGuard<V>) => InterfaceBuilder<T & {
-        [prop in K]?: V;
-    }>;
+    withOptionalProperty: <K extends string, V>(key: K, ptv: TypeGuard<V>) => InterfaceBuilder<T & Partial<Record<K, V>>>;
     withProperties: <V extends object>(props: MappedTypeGuard<V>) => InterfaceBuilder<T & V>;
-    withProperty: <K extends string, V>(key: K, ptv: TypeGuard<V>) => InterfaceBuilder<T & {
-        [prop in K]: V;
-    }>;
+    withProperty: <K extends string, V>(key: K, ptv: TypeGuard<V>) => InterfaceBuilder<T & Record<K, V>>;
     withStringIndexSignature: <V>(value: TypeGuard<V>, enforce?: boolean) => InterfaceBuilder<T & Record<string, V>>;
 }
 
@@ -116,9 +112,7 @@ export class IsInterface implements InterfaceBuilder<object> {
     // (undocumented)
     withOptionalProperties<V extends object>(props: MappedTypeGuard<V>): InterfaceBuilder<object & Partial<V>>;
     // (undocumented)
-    withOptionalProperty<K extends string, V>(key: K, ptv: TypeGuard<V>): InterfaceBuilder<object & {
-        [prop in K]?: V;
-    }>;
+    withOptionalProperty<K extends string, V>(key: K, ptv: TypeGuard<V>): InterfaceBuilder<object & Partial<Record<K, V>>>;
     // (undocumented)
     withProperties<V extends object>(props: MappedTypeGuard<V>): InterfaceBuilder<object & V>;
     // (undocumented)

jest.config.js

@@ -167,7 +167,7 @@ export default {
 	// ],
 
 	// An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
-	testPathIgnorePatterns: ['/node_modules/', '/dist/', '/__utils__/', '/examples/'],
+	testPathIgnorePatterns: ['/node_modules/', '/dist/', '/__utils__/', '/examples/', '.stryker-tmp'],
 
 	// The regexp pattern or array of patterns that Jest uses to detect test files
 	// testRegex: [],

src/combinators/interface.ts

@@ -33,15 +33,15 @@ export interface InterfaceBuilder<T extends object> {
 	 * @param key - The string key of the property.
 	 * @param ptv - The type guard for this property.
 	 */
-	withProperty: <K extends string, V>(key: K, ptv: TypeGuard<V>) => InterfaceBuilder<T & { [prop in K]: V }>;
+	withProperty: <K extends string, V>(key: K, ptv: TypeGuard<V>) => InterfaceBuilder<T & Record<K, V>>;
 
 	/**
 	 * Add a single optional property to the interface.
 	 *
 	 * @param key - The string key of the property.
 	 * @param ptv - The type guard for this property.
 	 */
-	withOptionalProperty: <K extends string, V>(key: K, ptv: TypeGuard<V>) => InterfaceBuilder<T & { [prop in K]?: V }>;
+	withOptionalProperty: <K extends string, V>(key: K, ptv: TypeGuard<V>) => InterfaceBuilder<T & Partial<Record<K, V>>>;
 
 	/**
 	 * Add a string index signature to the interface.
@@ -101,7 +101,7 @@ class InterfaceStep<T extends object> implements InterfaceBuilder<T> {
 	public withOptionalProperty<K extends string, V>(
 		key: K,
 		ptv: TypeGuard<V>,
-	): InterfaceBuilder<T & { [prop in K]?: V }> {
+	): InterfaceBuilder<T & Partial<Record<K, V>>> {
 		return new InterfaceStep(isIntersection(this.ptt, o.hasOptionalProperty(key, ptv)));
 	}
 
@@ -143,7 +143,7 @@ export class IsInterface implements InterfaceBuilder<object> {
 	public withOptionalProperty<K extends string, V>(
 		key: K,
 		ptv: TypeGuard<V>,
-	): InterfaceBuilder<object & { [prop in K]?: V }> {
+	): InterfaceBuilder<object & Partial<Record<K, V>>> {
 		return new InterfaceStep(o.hasOptionalProperty(key, ptv));
 	}
 

src/objects.ts

@@ -15,7 +15,7 @@ import { isObject } from './primitives.js';
  */
 export const hasProperty
 	= <K extends string, V>(property: K, value: TypeGuard<V>): PartialTypeGuard<object, Record<K, V>> =>
-		(o: object): o is { [prop in K]: V } =>
+		(o: object): o is Record<K, V> =>
 		// If the property exists and conforms to the value type guard.
 			value((o as Record<string, unknown>)[property]);
 
@@ -25,8 +25,8 @@ export const hasProperty
  * @public
  */
 export const hasOptionalProperty
-	= <K extends string, V>(property: K, value: TypeGuard<V>): PartialTypeGuard<object, { [prop in K]?: V }> =>
-		(o: object): o is { [prop in K]: V } =>
+	= <K extends string, V>(property: K, value: TypeGuard<V>): PartialTypeGuard<object, Partial<Record<K, V>>> =>
+		(o: object): o is Record<K, V> =>
 			!(property in o)
 			// If the property exists and conforms to the value type guard.
 			|| value((o as Record<string, unknown>)[property]);
@@ -40,7 +40,7 @@ export const hasOptionalProperty
  */
 export const isRecord
 	= <K extends string, V>(property: K, value: TypeGuard<V>): TypeGuard<Record<K, V>> =>
-		(o: unknown): o is { [prop in K]: V } =>
+		(o: unknown): o is Record<K, V> =>
 			isObject(o) && hasProperty(property, value)(o);
 
 /**

turbo.json

@@ -1,6 +1,7 @@
 {
 	"$schema": "https://turbo.build/schema.json",
 	"globalPassThroughEnv": ["ASDF_*"],
+	"daemon": false,
 	"tasks": {
 		"build": {
 			"dependsOn": ["build:tsc", "build:api", "build:esbuild:cjs", "build:esbuild:esm"]