feat: update fft/base/fftpack/ndarray/generic TypeScript declarations

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

@@ -22,6 +22,7 @@
 
 import cffti = require( '@stdlib/fft/base/fftpack/ndarray/generic/cffti' );
 import cosqi = require( '@stdlib/fft/base/fftpack/ndarray/generic/cosqi' );
+import rfftf = require( '@stdlib/fft/base/fftpack/ndarray/generic/rfftf' );
 import rffti = require( '@stdlib/fft/base/fftpack/ndarray/generic/rffti' );
 import sinqi = require( '@stdlib/fft/base/fftpack/ndarray/generic/sinqi' );
 
@@ -112,6 +113,42 @@ interface Namespace {
 	*/
 	cosqi: typeof cosqi;
 
+	/**
+	* Computes the forward discrete Fourier transform (DFT) of a real-valued one-dimensional ndarray.
+	*
+	* ## Notes
+	*
+	* -   The function expects the following ndarrays:
+	*
+	*     -   a one-dimensional input ndarray.
+	*     -   a one-dimensional workspace ndarray containing pre-computed values.
+	*
+	* @param arrays - array-like object containing ndarrays
+	* @returns input ndarray
+	*
+	* @example
+	* var Float64Vector = require( '@stdlib/ndarray/vector/float64' );
+	* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+	* var rffti = require( '@stdlib/fft/base/fftpack/ndarray/generic/rffti' );
+	*
+	* var N = 4;
+	* var len = scalar2ndarray( N, {
+	*     'dtype': 'int32'
+	* });
+	*
+	* var w = new Float64Vector( ( 2*N ) + 34 );
+	* rffti( [ w, len ] );
+	*
+	* var r = new Float64Vector( [ 1.0, 2.0, 3.0, 4.0 ] );
+	*
+	* var out = ns.rfftf( [ r, w ] );
+	* // returns <ndarray>[ 10.0, -2.0, 2.0, -2.0 ]
+	*
+	* var bool = ( out === r );
+	* // returns true
+	*/
+	rfftf: typeof rfftf;
+
 	/**
 	* Initializes a workspace array for performing a real-valued Fourier transform on a one-dimensional ndarray.
 	*