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

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

@@ -24,6 +24,7 @@ import cffti = require( '@stdlib/fft/base/fftpack/generic/cffti' );
 import cosqi = require( '@stdlib/fft/base/fftpack/generic/cosqi' );
 import costi = require( '@stdlib/fft/base/fftpack/generic/costi' );
 import decompose = require( '@stdlib/fft/base/fftpack/generic/decompose' );
+import rfftf = require( '@stdlib/fft/base/fftpack/generic/rfftf' );
 import rffti = require( '@stdlib/fft/base/fftpack/generic/rffti' );
 import sinqi = require( '@stdlib/fft/base/fftpack/generic/sinqi' );
 import sinti = require( '@stdlib/fft/base/fftpack/generic/sinti' );
@@ -160,6 +161,34 @@ interface Namespace {
 	*/
 	decompose: typeof decompose;
 
+	/**
+	* Computes the forward discrete Fourier transform (DFT) of a real-valued sequence.
+	*
+	* @param N - length of the sequence to transform
+	* @param r - input array
+	* @param strideR - stride length for `r`
+	* @param offsetR - starting index for `r`
+	* @param w - workspace array containing pre-computed values
+	* @param strideW - stride length for `w`
+	* @param offsetW - starting index for `w`
+	* @returns input array
+	*
+	* @example
+	* var Float64Array = require( '@stdlib/array/float64' );
+	* var rffti = require( '@stdlib/fft/base/fftpack/generic/rffti' );
+	*
+	* var N = 4;
+	*
+	* var w = new Float64Array( ( 2*N ) + 34 );
+	* rffti( N, w, 1, 0 );
+	*
+	* var r = new Float64Array( [ 1.0, 2.0, 3.0, 4.0 ] );
+	*
+	* ns.rfftf( N, r, 1, 0, w, 1, 0 );
+	* // r => <Float64Array>[ 10.0, -2.0, 2.0, -2.0 ]
+	*/
+	rfftf: typeof rfftf;
+
 	/**
 	* Initializes a workspace array for performing a real-valued Fourier transform.
 	*
@@ -269,7 +298,7 @@ interface Namespace {
 }
 
 /**
-* FFTPACK routines for fast Fourier transforms for "generic" collections.
+* FFTPACK routines for fast Fourier transforms on generic collections.
 */
 declare var ns: Namespace;