diff --git a/lib/node_modules/@stdlib/assert/is-pascalcase/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-pascalcase/docs/types/index.d.ts
index 8353d75a253..07044e0142d 100644
--- a/lib/node_modules/@stdlib/assert/is-pascalcase/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-pascalcase/docs/types/index.d.ts
@@ -40,7 +40,7 @@
 * var bool = isPascalcase( null );
 * // returns false
 */
-declare function isPascalcase( value: any ): boolean;
+declare function isPascalcase( value: any ): value is string;
 
 
 // EXPORTS //
diff --git a/lib/node_modules/@stdlib/assert/is-plain-object-array/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-plain-object-array/docs/types/index.d.ts
index 09db98594c4..eaa21c27142 100644
--- a/lib/node_modules/@stdlib/assert/is-plain-object-array/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-plain-object-array/docs/types/index.d.ts
@@ -34,7 +34,7 @@
 * bool = isPlainObjectArray( [ {}, '3.0' ] );
 * // returns false
 */
-declare function isPlainObjectArray( value: any ): boolean;
+declare function isPlainObjectArray( value: any ): value is ArrayLike<object>;
 
 
 // EXPORTS //
diff --git a/lib/node_modules/@stdlib/assert/is-plain-object/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-plain-object/docs/types/index.d.ts
index 09329037bb7..5a2638db0fc 100644
--- a/lib/node_modules/@stdlib/assert/is-plain-object/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-plain-object/docs/types/index.d.ts
@@ -32,7 +32,7 @@
 * var bool = isPlainObject( null );
 * // returns false
 */
-declare function isPlainObject( value: any ): boolean;
+declare function isPlainObject( value: any ): value is object;
 
 
 // EXPORTS //
diff --git a/lib/node_modules/@stdlib/assert/is-positive-integer-array/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-positive-integer-array/docs/types/index.d.ts
index 5dcd918369d..92e02324bf0 100644
--- a/lib/node_modules/@stdlib/assert/is-positive-integer-array/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-positive-integer-array/docs/types/index.d.ts
@@ -36,7 +36,7 @@ interface IsPositiveIntegerArray {
 	* var bool = isPositiveIntegerArray( [ 3.0, '3.0' ] );
 	* // returns false
 	*/
-	( value: any ): boolean;
+	( value: any ): value is ArrayLike<number | Number>;
 
 	/**
 	* Tests if a value is an array-like object containing only positive primitive integer values.
@@ -52,7 +52,7 @@ interface IsPositiveIntegerArray {
 	* var bool = isPositiveIntegerArray.primitives( [ 3.0, new Number(1.0) ] );
 	* // returns false
 	*/
-	primitives( value: any ): boolean;
+	primitives( value: any ): value is ArrayLike<number>;
 
 	/**
 	* Tests if a value is an array-like object containing only number objects having positive integer values.
@@ -68,7 +68,7 @@ interface IsPositiveIntegerArray {
 	* var bool = isPositiveIntegerArray.objects( [ 1.0, 2.0, 10.0 ] );
 	* // returns false
 	*/
-	objects( value: any ): boolean;
+	objects( value: any ): value is ArrayLike<Number>;
 }
 
 /**
diff --git a/lib/node_modules/@stdlib/assert/is-positive-integer/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-positive-integer/docs/types/index.d.ts
index 9d9e747d501..10aa52961f9 100644
--- a/lib/node_modules/@stdlib/assert/is-positive-integer/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-positive-integer/docs/types/index.d.ts
@@ -52,7 +52,7 @@ interface IsPositiveInteger {
 	* var bool = isPositiveInteger( null );
 	* // returns false
 	*/
-	( value: any ): boolean;
+	( value: any ): value is number | Number;
 
 	/**
 	* Tests if a value is a number primitive having a positive integer value.
@@ -68,7 +68,7 @@ interface IsPositiveInteger {
 	* var bool = isPositiveInteger.isPrimitive( new Number( 3.0 ) );
 	* // returns false
 	*/
-	isPrimitive( value: any ): boolean;
+	isPrimitive( value: any ): value is number;
 
 	/**
 	* Tests if a value is a number object having a positive integer value.
@@ -84,7 +84,7 @@ interface IsPositiveInteger {
 	* var bool = isPositiveInteger.isObject( new Number( 3.0 ) );
 	* // returns true
 	*/
-	isObject( value: any ): boolean;
+	isObject( value: any ): value is Number;
 }
 
 /**
diff --git a/lib/node_modules/@stdlib/assert/is-positive-number-array/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-positive-number-array/docs/types/index.d.ts
index f31dcea0160..848863856bb 100644
--- a/lib/node_modules/@stdlib/assert/is-positive-number-array/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-positive-number-array/docs/types/index.d.ts
@@ -36,7 +36,7 @@ interface IsPositiveNumberArray {
 	* var bool = isPositiveNumberArray( [ 3.0, '3.0' ] );
 	* // returns false
 	*/
-	( value: any ): boolean;
+	( value: any ): value is ArrayLike<number | Number>;
 
 	/**
 	* Tests if a value is an array-like object containing only positive primitive number values.
@@ -52,7 +52,7 @@ interface IsPositiveNumberArray {
 	* var bool = isPositiveNumberArray.primitives( [ 3.0, new Number(1.0) ] );
 	* // returns false
 	*/
-	primitives( value: any ): boolean;
+	primitives( value: any ): value is ArrayLike<number>;
 
 	/**
 	* Tests if a value is an array-like object containing only number objects having positive number values.
@@ -68,7 +68,7 @@ interface IsPositiveNumberArray {
 	* var bool = isPositiveNumberArray.objects( [ 1.0, 2.7, 10.0 ] );
 	* // returns false
 	*/
-	objects( value: any ): boolean;
+	objects( value: any ): value is ArrayLike<Number>;
 }
 
 /**
diff --git a/lib/node_modules/@stdlib/assert/is-positive-number/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-positive-number/docs/types/index.d.ts
index 6ab7ac213ed..ef8383bb7fe 100644
--- a/lib/node_modules/@stdlib/assert/is-positive-number/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-positive-number/docs/types/index.d.ts
@@ -48,7 +48,7 @@ interface IsPositiveNumber {
 	* var bool = isPositiveNumber( null );
 	* // returns false
 	*/
-	( value: any ): boolean;
+	( value: any ): value is number | Number;
 
 	/**
 	* Tests if a value is a number primitive having a positive value.
@@ -64,7 +64,7 @@ interface IsPositiveNumber {
 	* var bool = isPositiveNumber.isPrimitive( new Number( 3.0 ) );
 	* // returns false
 	*/
-	isPrimitive( value: any ): boolean;
+	isPrimitive( value: any ): value is number;
 
 	/**
 	* Tests if a value is a number object having a positive value.
@@ -80,7 +80,7 @@ interface IsPositiveNumber {
 	* var bool = isPositiveNumber.isObject( new Number( 3.0 ) );
 	* // returns true
 	*/
-	isObject( value: any ): boolean;
+	isObject( value: any ): value is Number;
 }
 
 /**
diff --git a/lib/node_modules/@stdlib/assert/is-positive-zero/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-positive-zero/docs/types/index.d.ts
index c6ff827d364..8047f22be67 100644
--- a/lib/node_modules/@stdlib/assert/is-positive-zero/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-positive-zero/docs/types/index.d.ts
@@ -52,7 +52,7 @@ interface IsPositiveZero {
 	* var bool = isPositiveZero( null );
 	* // returns false
 	*/
-	( value: any ): boolean;
+	( value: any ): value is number | Number;
 
 	/**
 	* Tests if a value is a number primitive equal to positive zero.
@@ -68,7 +68,7 @@ interface IsPositiveZero {
 	* var bool = isPositiveZero.isPrimitive( new Number( 0.0 ) );
 	* // returns false
 	*/
-	isPrimitive( value: any ): boolean;
+	isPrimitive( value: any ): value is number;
 
 	/**
 	* Tests if a value is a number object having a value equal to positive zero.
@@ -84,7 +84,7 @@ interface IsPositiveZero {
 	* var bool = isPositiveZero.isObject( new Number( 0.0 ) );
 	* // returns true
 	*/
-	isObject( value: any ): boolean;
+	isObject( value: any ): value is Number;
 }
 
 /**
diff --git a/lib/node_modules/@stdlib/assert/is-prime/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-prime/docs/types/index.d.ts
index 39756051caf..cff3a7b4bdf 100644
--- a/lib/node_modules/@stdlib/assert/is-prime/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-prime/docs/types/index.d.ts
@@ -48,7 +48,7 @@ interface IsPrime {
 	* var bool = isPrime( null );
 	* // returns false
 	*/
-	( value: any ): boolean;
+	( value: any ): value is number | Number;
 
 	/**
 	* Tests if a value is a number primitive having a value which is a prime number.
@@ -64,7 +64,7 @@ interface IsPrime {
 	* var bool = isPrime.isPrimitive( new Number( 5.0 ) );
 	* // returns false
 	*/
-	isPrimitive( value: any ): boolean;
+	isPrimitive( value: any ): value is number;
 
 	/**
 	* Tests if a value is a number object having a value which is a prime number.
@@ -80,7 +80,7 @@ interface IsPrime {
 	* var bool = isPrime.isObject( new Number( 5.0 ) );
 	* // returns true
 	*/
-	isObject( value: any ): boolean;
+	isObject( value: any ): value is Number;
 }
 
 /**
diff --git a/lib/node_modules/@stdlib/assert/is-primitive-array/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-primitive-array/docs/types/index.d.ts
index 9b363939271..54772b4432b 100644
--- a/lib/node_modules/@stdlib/assert/is-primitive-array/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-primitive-array/docs/types/index.d.ts
@@ -34,7 +34,7 @@
 * bool = isPrimitiveArray( [ new String('abc'), '3.0' ] );
 * // returns false
 */
-declare function isPrimitiveArray( value: any ): boolean;
+declare function isPrimitiveArray( value: any ): value is Array<any>;
 
 
 // EXPORTS //
diff --git a/lib/node_modules/@stdlib/assert/is-primitive/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-primitive/docs/types/index.d.ts
index f07cc973387..b9fbf1f5b88 100644
--- a/lib/node_modules/@stdlib/assert/is-primitive/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-primitive/docs/types/index.d.ts
@@ -32,7 +32,7 @@
 * var bool = isPrimitive( {} );
 * // returns false
 */
-declare function isPrimitive( value: any ): boolean;
+declare function isPrimitive( value: any ): value is null | undefined | string | boolean | number | symbol;
 
 
 // EXPORTS //
diff --git a/lib/node_modules/@stdlib/assert/is-probability-array/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-probability-array/docs/types/index.d.ts
index 1124b65d3e0..c44348b8b81 100644
--- a/lib/node_modules/@stdlib/assert/is-probability-array/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-probability-array/docs/types/index.d.ts
@@ -36,7 +36,7 @@ interface IsProbabilityArray {
 	* var bool = isProbabilityArray( [ 0.3, '0.3' ] );
 	* // returns false
 	*/
-	( value: any ): boolean;
+	( value: any ): value is ArrayLike<number | Number>;
 
 	/**
 	* Tests if a value is an array-like object containing only primitive probabilities.
@@ -52,7 +52,7 @@ interface IsProbabilityArray {
 	* var bool = isProbabilityArray.primitives( [ 0.3, new Number(0.1) ] );
 	* // returns false
 	*/
-	primitives( value: any ): boolean;
+	primitives( value: any ): value is ArrayLike<number>;
 
 	/**
 	* Tests if a value is an array-like object containing only number objects having probability values.
@@ -68,7 +68,7 @@ interface IsProbabilityArray {
 	* var bool = isProbabilityArray.objects( [ 0.1, 0.2, 0.3 ] );
 	* // returns false
 	*/
-	objects( value: any ): boolean;
+	objects( value: any ): value is ArrayLike<Number>;
 }
 
 /**
diff --git a/lib/node_modules/@stdlib/assert/is-probability/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-probability/docs/types/index.d.ts
index 254410c9b65..d83a18d18e7 100644
--- a/lib/node_modules/@stdlib/assert/is-probability/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-probability/docs/types/index.d.ts
@@ -48,7 +48,7 @@ interface IsProbability {
 	* var bool = isProbability( null );
 	* // returns false
 	*/
-	( value: any ): boolean;
+	( value: any ): value is number | Number;
 
 	/**
 	* Tests if a value is a number primitive having a value which is a probability.
@@ -64,7 +64,7 @@ interface IsProbability {
 	* var bool = isProbability.isPrimitive( new Number( 0.66 ) );
 	* // returns false
 	*/
-	isPrimitive( value: any ): boolean;
+	isPrimitive( value: any ): value is number;
 
 	/**
 	* Tests if a value is a number object having a value which is a probability.
@@ -80,7 +80,7 @@ interface IsProbability {
 	* var bool = isProbability.isObject( new Number( 0.5 ) );
 	* // returns true
 	*/
-	isObject( value: any ): boolean;
+	isObject( value: any ): value is Number;
 }
 
 /**
diff --git a/lib/node_modules/@stdlib/assert/is-property-key/docs/types/index.d.ts b/lib/node_modules/@stdlib/assert/is-property-key/docs/types/index.d.ts
index 9f4878a2f40..78161b808cf 100644
--- a/lib/node_modules/@stdlib/assert/is-property-key/docs/types/index.d.ts
+++ b/lib/node_modules/@stdlib/assert/is-property-key/docs/types/index.d.ts
@@ -46,7 +46,7 @@
 * var bool = isPropertyKey( [] );
 * // returns false
 */
-declare function isPropertyKey( value: any ): boolean;
+declare function isPropertyKey( value: any ): value is PropertyKey;
 
 
 // EXPORTS //