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Invokers are a way of creating public component functions whose arguments are resolved from the environment at invocation time.

An invoker declaration is resolved every time it is invoked. This is useful if a function needs to do something different in different contexts. However, the resolution is time consuming, so use invokers prudently.

Invokers can be used as listeners:

fluid.defaults("my.component", {
    ...
    invokers: {
        func1: {
            funcName: "my.component.func",
            args: ["{that}", "{arguments}.0"]
        }
    },
    listeners: {
        onSomething: "{that}.func1"
    },
    ...
});
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