refactor: improve type specificity

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/remove-singleton-dimensions/docs/types/index.d.ts

@@ -44,7 +44,7 @@ import { ndarray } from '@stdlib/types/ndarray';
 * var y = removeSingletonDimensions( x, false );
 * // returns <ndarray>[ [ 1, 2 ], [ 3, 4 ] ]
 */
-declare function removeSingletonDimensions( x: ndarray, writable: boolean ): ndarray;
+declare function removeSingletonDimensions<T extends ndarray = ndarray>( x: T, writable: boolean ): T;
 
 
 // EXPORTS //

lib/node_modules/@stdlib/ndarray/base/remove-singleton-dimensions/docs/types/test.ts

@@ -16,17 +16,21 @@
 * limitations under the License.
 */
 
-import array = require( '@stdlib/ndarray/array' );
+/* eslint-disable space-in-parens */
+
+import zeros = require( '@stdlib/ndarray/zeros' );
 import removeSingletonDimensions = require( './index' );
 
 
 // TESTS //
 
 // The function returns an ndarray...
 {
-	const x = array( [ [ 1, 2 ], [ 3, 4 ] ] );
+	const x = zeros( [ 2, 2 ], {
+		'dtype': 'float64'
+	});
 
-	removeSingletonDimensions( x, false ); // $ExpectType ndarray
+	removeSingletonDimensions( x, false ); // $ExpectType float64ndarray
 }
 
 // The compiler throws an error if the function is not provided a first argument which is an ndarray...
@@ -43,7 +47,9 @@ import removeSingletonDimensions = require( './index' );
 
 // The compiler throws an error if the function is not provided a second argument which is a boolean...
 {
-	const x = array( [ [ 1, 2 ], [ 3, 4 ] ] );
+	const x = zeros( [ 2, 2 ], {
+		'dtype': 'float64'
+	});
 
 	removeSingletonDimensions( x, '5' ); // $ExpectError
 	removeSingletonDimensions( x, 5 ); // $ExpectError
@@ -55,7 +61,9 @@ import removeSingletonDimensions = require( './index' );
 
 // The compiler throws an error if the function is provided an unsupported number of arguments...
 {
-	const x = array( [ [ 1, 2 ], [ 3, 4 ] ] );
+	const x = zeros( [ 2, 2 ], {
+		'dtype': 'float64'
+	});
 
 	removeSingletonDimensions(); // $ExpectError
 	removeSingletonDimensions( x ); // $ExpectError

lib/node_modules/@stdlib/ndarray/base/remove-singleton-dimensions/test/test.js

@@ -160,7 +160,7 @@ tape( 'the function removes singleton dimensions (base)', function test( t ) {
 	y = removeSingletonDimensions( x, false );
 
 	t.notEqual( y, x, 'returns expected value' );
-	t.deepEqual( y.shape, [ 2, 2 ], 'returns expected value' );
+	t.deepEqual( getShape( y ), [ 2, 2 ], 'returns expected value' );
 	t.strictEqual( getData( y ), getData( x ), 'returns expected value' );
 
 	t.end();