How to use the @redux-saga/core/effects.effectTypes.FORK function in @redux-saga/core

.addEffectType("race")
        .resetStyle()
        .addDescResult(desc, true);
    } else if (type === effectTypes.CALL) {
      formatter
        .addEffectType("call")
        .resetStyle()
        .addCall(payload.fn.name, payload.args)
        .addDescResult(desc);
    } else if (type === effectTypes.CPS) {
      formatter
        .addEffectType("cps")
        .resetStyle()
        .addCall(payload.fn.name, payload.args)
        .addDescResult(desc);
    } else if (type === effectTypes.FORK) {
      formatter
        .addEffectType(payload.detached ? "spawn" : "fork")
        .resetStyle()
        .addCall(payload.fn.name, payload.args)
        .addDescResult(desc);
    } else if (type === effectTypes.JOIN) {
      formatter
        .addEffectType("join")
        .resetStyle()
        .addDescResult(desc);
    } else if (type === effectTypes.CANCEL) {
      formatter
        .addEffectType("cancel")
        .resetStyle()
        .appendData(payload.name);
    } else if (type === effectTypes.SELECT) {