typescript error : doesn't the property on the options type -

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i have object like:

var options = {title: "", buttons: undefined}

but want add function, this:

options.open(){...}

typescript reported error info: doesn't property on options type,

how can add function options?

var options = {     title: "",     buttons: undefined,     open: function() {         console.log("you ran open() function");     } }; options.open()

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