TypeScriptでオブジェクトにプロパティを動的に割り当てる

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interface LooseObject {
    [key: string]: any
}

var obj: LooseObject = {};

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var obj: {[k: string]: any} = {};
    obj.prop1 = "test"
    obj.propArray = new Array();
    obj.propArray.push("aa")
    obj.propArray.push("bb")

    console.log(obj)

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obj:{
    prop1:"test",
    propArray:["aa","bb"]
    }

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var obj:any = {};
    obj.prop1 = "test"
    obj.propArray = new Array();
    obj.propArray.push("aa")
    obj.propArray.push("bb")

    console.log(obj)

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var user = {
  id: 1,
  name: "name",
};

user.country = "Japan";
user["language"] = "jp";

console.log("user", user);

// user Object {id: 1, name: "name", country: "Japan", language: "jp"}