Typescript: Create Function From String with Interface

Question

I have some logic saved in a string and I need to convert it to a runable function. I have Interface already setup to make it strongly typed in Typescript, but it seem to not work.

interface IInterface {
    Run(data: string): Promise<string>;
}
let code: string = `
    return new class{
        let Run = function(data) {
            console.log(data);
            return "SUCCESS";
        };
    }
`;
let obj: IInterface = Function(code) as IInterface;
obj.Run("Test ").then((result: string ) => {
    console.log(result);
});

Should write: Test SUCCESS

Is that the actual text that you need to work with or you can change the syntax so that it will be real javascript? — Nitzan Tomer
– Nitzan Tomer, Commented Jul 12, 2017 at 19:30

Meirion Hughes · Accepted Answer · 2017-07-12 19:48:33Z

1

you evaluate javascript stored in strings via eval.

interface IInterface {
  run(data: string): Promise<string>;
}

var f: IInterface = eval(`({run: function(data) { console.log(data); return Promise.resolve("SUCCESS"); } })`);

f.run("hello world").then(x=>console.log(x));

should print as you expect.

answered Jul 12, 2017 at 19:48

Meirion Hughes

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