zmk/app/tests/tap-dance/behavior_keymap.dtsi

#include <dt-bindings/zmk/keys.h>
#include <behaviors.dtsi>
#include <dt-bindings/zmk/kscan_mock.h>

/ {
    behaviors {
        ht: hold_tap {
            compatible = "zmk,behavior-hold-tap";
            #binding-cells = <2>;
            tapping-term-ms = <200>;
            quick-tap-ms = <0>;
            flavor = "tap-preferred";
            bindings = <&kp>, <&kp>;
        };

        tdm: tap_dance_mixed {
            compatible = "zmk,behavior-tap-dance";
            #binding-cells = <0>;
            tapping-term-ms = <200>;
            bindings = <&ht LSHIFT A>, <&ht LALT B>, <&ht LGUI C>;
        };

        tdb: tap_dance_basic {
            compatible = "zmk,behavior-tap-dance";
            #binding-cells = <0>;
            tapping-term-ms = <200>;
            bindings = <&kp N1>, <&kp N2>, <&kp N3>;
        };

        td2: tap_dance_basic_2 {
            compatible = "zmk,behavior-tap-dance";
            #binding-cells = <0>;
            tapping-term-ms = <200>;
            bindings = <&kp A>, <&kp B>, <&kp C>;
        };

        tds: tap_dance_single {
            compatible = "zmk,behavior-tap-dance";
            #binding-cells = <0>;
            tapping-term-ms = <200>;
            bindings = <&kp S>;
        };
    };

    combos {
        compatible = "zmk,combos";

        td_combo {
            bindings = <&tdb>;
            key-positions = <0 1>;
            timeout-ms = <50>;
        };
    };

    keymap {
        compatible = "zmk,keymap";

        default_layer {
            bindings = <
            &tdm    &tds
            &tdb    &td2>;
        };
    };
};