feat: use type predicates for narrowing

Author: Planeshifter

lib/node_modules/@stdlib/assert/is-between-array/docs/types/index.d.ts

@@ -58,7 +58,7 @@ type Comparison = 'open' | 'closed';
 * var bool = isBetweenArray( arr, 3.0, 4.0, 'closed', 'open' );
 * // returns false
 */
-declare function isBetweenArray( value: any, a: any, b: any, left?: Comparison, right?: Comparison ): boolean; // tslint-disable-line max-line-length
+declare function isBetweenArray( value: any, a: any, b: any, left?: Comparison, right?: Comparison ): value is ArrayLike<number>; // tslint-disable-line max-line-length
 
 
 // EXPORTS //

lib/node_modules/@stdlib/assert/is-between/docs/types/index.d.ts

@@ -57,7 +57,7 @@ type Comparison = 'open' | 'closed';
 * var bool = isBetween( 3.14, 3.0, 3.14, 'closed', 'open' );
 * // returns false
 */
-declare function isBetween( value: any, a: any, b: any, left?: Comparison, right?: Comparison ): boolean; // tslint-disable-line max-line-length
+declare function isBetween( value: any, a: any, b: any, left?: Comparison, right?: Comparison ): value is number; // tslint-disable-line max-line-length
 
 
 // EXPORTS //

lib/node_modules/@stdlib/assert/is-bigint/docs/types/index.d.ts

@@ -44,7 +44,7 @@ interface IsBigInt {
 	* var bool = isBigInt( {} );
 	* // returns false
 	*/
-	( value: any ): boolean;
+	( value: any ): value is bigint | BigInt;
 
 	/**
 	* Tests if a value is a BigInt primitive.
@@ -68,7 +68,7 @@ interface IsBigInt {
 	* var bool = isBigInt.isPrimitive( {} );
 	* // returns false
 	*/
-	isPrimitive( value: any ): boolean;
+	isPrimitive( value: any ): value is bigint;
 
 	/**
 	* Tests if a value is a BigInt object.
@@ -92,7 +92,7 @@ interface IsBigInt {
 	* var bool = isBigInt.isObject( {} );
 	* // returns false
 	*/
-	isObject( value: any ): boolean;
+	isObject( value: any ): value is BigInt;
 }
 
 /**

lib/node_modules/@stdlib/assert/is-bigint64array/docs/types/index.d.ts

@@ -32,7 +32,7 @@
 * var bool = isBigInt64Array( [] );
 * // returns false
 */
-declare function isBigInt64Array( value: any ): boolean;
+declare function isBigInt64Array( value: any ): value is BigInt64Array;
 
 
 // EXPORTS //

lib/node_modules/@stdlib/assert/is-biguint64array/docs/types/index.d.ts

@@ -32,7 +32,7 @@
 * var bool = isBigUint64Array( [] );
 * // returns false
 */
-declare function isBigUint64Array( value: any ): boolean;
+declare function isBigUint64Array( value: any ): value is BigUint64Array;
 
 
 // EXPORTS //

lib/node_modules/@stdlib/assert/is-binary-string/docs/types/index.d.ts

@@ -36,7 +36,7 @@
 * var bool = isBinaryString( '' );
 * // returns false
 */
-declare function isBinaryString( value: any ): boolean;
+declare function isBinaryString( value: any ): value is string;
 
 
 // EXPORTS //

lib/node_modules/@stdlib/assert/is-blank-string/docs/types/index.d.ts

@@ -44,7 +44,7 @@
 * var bool = isBlankString( 'beep' );
 * // returns false
 */
-declare function isBlankString( value: any ): boolean;
+declare function isBlankString( value: any ): value is string;
 
 
 // EXPORTS //

lib/node_modules/@stdlib/assert/is-boolean-array/docs/types/index.d.ts

@@ -36,7 +36,7 @@ interface IsBooleanArray {
 	* var bool = isBooleanArray( [ true, 'abc', false ] );
 	* // returns false
 	*/
-	( value: any ): boolean;
+	( value: any ): value is Array<boolean|Boolean>;
 
 	/**
 	* Tests if a value is an array-like object containing only boolean primitives.
@@ -54,7 +54,7 @@ interface IsBooleanArray {
 	* var bool = isBooleanArray.primitives( [ false, new Boolean( true ) ] );
 	* // returns false
 	*/
-	primitives( value: any ): boolean;
+	primitives( value: any ): value is Array<boolean>;
 
 	/**
 	* Tests if a value is an array-like object containing only Boolean objects.
@@ -74,7 +74,7 @@ interface IsBooleanArray {
 	* var bool = isBooleanArray.objects( [ new Boolean( false ), true ] );
 	* // returns false
 	*/
-	objects( value: any ): boolean;
+	objects( value: any ): value is Array<Boolean>;
 }
 
 /**

lib/node_modules/@stdlib/assert/is-boolean/docs/types/index.d.ts

@@ -48,7 +48,7 @@ interface IsBoolean {
 	* var bool = isBoolean( new Boolean( true ) );
 	* // returns true
 	*/
-	( value: any ): boolean;
+	( value: any ): value is boolean | Boolean;
 
 	/**
 	* Tests if a value is a boolean primitive.
@@ -70,7 +70,7 @@ interface IsBoolean {
 	* var bool = isBoolean.isPrimitive( new Boolean( true ) );
 	* // returns false
 	*/
-	isPrimitive( value: any ): boolean;
+	isPrimitive( value: any ): value is boolean;
 
 	/**
 	* Tests if a value is a boolean object.
@@ -88,7 +88,7 @@ interface IsBoolean {
 	* var bool = isBoolean.isObject( new Boolean( false ) );
 	* // returns true
 	*/
-	isObject( value: any ): boolean;
+	isObject( value: any ): value is Boolean;
 }
 
 /**

lib/node_modules/@stdlib/assert/is-boxed-primitive/docs/types/index.d.ts

@@ -50,7 +50,7 @@
 * var bool = isBoxedPrimitive( Symbol( 'beep' ) );
 * // returns false
 */
-declare function isBoxedPrimitive( value: any ): boolean;
+declare function isBoxedPrimitive( value: any ): value is String | Number | Boolean | Symbol; // tslint:disable-line:max-line-length
 
 
 // EXPORTS //

lib/node_modules/@stdlib/assert/is-buffer/docs/types/index.d.ts

@@ -18,6 +18,8 @@
 
 // TypeScript Version: 2.0
 
+/// <reference types="@types/node"/>
+
 /**
 * Tests if a value is a Buffer instance.
 *
@@ -40,7 +42,7 @@
 * var v = isBuffer( [] );
 * // returns false
 */
-declare function isBuffer( value: any ): boolean;
+declare function isBuffer( value: any ): value is Buffer;
 
 
 // EXPORTS //