feat: update fft/base/fftpack TypeScript declarations

lib/node_modules/@stdlib/fft/base/fftpack/docs/types/index.d.ts

@@ -25,6 +25,7 @@
 import decompose = require( '@stdlib/fft/base/fftpack/decompose' );
 import rffti = require( '@stdlib/fft/base/fftpack/rffti' );
 import sinqi = require( '@stdlib/fft/base/fftpack/sinqi' );
+import sinti = require( '@stdlib/fft/base/fftpack/sinti' );
 
 /**
 * Interface describing the `fftpack` namespace.
@@ -93,7 +94,7 @@
 	* // returns <Float64Array>[ ~0.98, ~0.92, ~0.83, ~0.7, ~0.56, ~0.38, ~0.2, ~0.0 ]
 	*
 	* var twiddleFactors = workspace.slice( 2*N, 3*N );
 	* // returns <Float64Array>[ 0, ~0.707, ~0.707, 0, 0, 0, 0, 0 ]
 	*
 	* var factors = workspace.slice( 3*N, ( 3*N ) + 4 );
 	* // returns <Float64Array>[ 8, 2, 2, 4 ]
@@ -185,12 +186,49 @@
 	* // returns <Float64Array>[ ~0.98, ~0.92, ~0.83, ~0.7, ~0.56, ~0.38, ~0.2, ~0.0 ]
 	*
 	* var twiddleFactors = workspace.slice( 2*N, 3*N );
 	* // returns <Float64Array>[ 0, ~0.707, ~0.707, 0, 0, 0, 0, 0 ]
 	*
 	* var factors = workspace.slice( 3*N, ( 3*N ) + 4 );
 	* // returns <Float64Array>[ 8, 2, 2, 4 ]
 	*/
 	sinqi: typeof sinqi;
+
+	/**
+	* Initializes a workspace array for performing a sine transform.
+	*
+	* ## Notes
+	*
+	* -   The workspace array should have a length of at least `( 2.5*N ) + 34` elements.
+	*
+	* @param N - length of the sequence
+	* @param workspace - workspace array
+	* @param strideW - stride length for `workspace`
+	* @param offsetW - starting index for `workspace`
+	* @returns workspace array
+	*
+	* @example
+	* var Float64Array = require( '@stdlib/array/float64' );
+	* var floor = require( '@stdlib/math/base/special/floor' );
+	*
+	* var N = 7;
+	* var workspace = new Float64Array( floor( 2.5*N ) + 34 );
+	*
+	* var out = ns.sinti( N, workspace, 1, 0 );
+	* // returns <Float64Array>
+	*
+	* var bool = ( out === workspace );
+	* // returns true
+	*
+	* var sineTable = workspace.slice( 0, floor( N/2 ) );
+	* // returns <Float64Array>[ ~0.765, ~1.414, ~1.848 ]
+	*
+	* var twiddleFactors = workspace.slice( floor( 3*N/2 ) + 1, floor( 5*N/2 ) + 2 );
+	* // returns <Float64Array>[ ~0.707, ~0.707, 0, 0, 0, 0, 0, 0 ]
+	*
+	* var factors = workspace.slice( floor( 5*N/2 ) + 2, floor( 5*N/2 ) + 2 + 4 );
+	* // returns <Float64Array>[ 8, 2, 2, 4 ]
+	*/
+	sinti: typeof sinti;
 }
 
 /**