/**
 * Componentwise computes smoothstep function for given nD tensor and thresholds
 * `b` (low edge) and `c` (high edge). Writes result to `out`. If `out` is null,
 * mutates `a`. Multi-method. Also see {@link step}.
 *
 * @remarks
 * Same as GLSL `smoothstep()` (but with changed order of arguments).
 *
 * Reference:
 *
 * - https://registry.khronos.org/OpenGL-Refpages/gl4/html/smoothstep.xhtml
 *
 * @param out - output tensor
 * @param a - input tensor
 * @param b - input tensor (low edge)
 * @param b - input tensor (high edge)
 */
export declare const smoothStep: import("./api.js").TensorOpTTT<number>;
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