zmk/app/tests/hold-tap/balanced/8-require-prior-idle/behavior_keymap.dtsi

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

/ {
    behaviors {
        ht_bal: behavior_balanced {
            compatible = "zmk,behavior-hold-tap";
            #binding-cells = <2>;
            flavor = "balanced";
            tapping-term-ms = <300>;
            quick-tap-ms = <300>;
            require-prior-idle-ms = <100>;
            bindings = <&kp>, <&kp>;
        };
    };

    keymap {
        compatible = "zmk,keymap";

        default_layer {
            bindings = <
                &ht_bal LEFT_SHIFT F &ht_bal LEFT_CONTROL C
                &kp D &none>;
        };
    };
};