Skip to content

Typescript can't infer types when using Proxy #20846

Open
@justinbc820

Description

@justinbc820

Code

let obj = {
    prop1: function () { },
    prop2: 'hello',
}

let prox = new Proxy(obj, {
    get: function (target, name) {
        return 5;
    }
});

prox.prop1.

Expected behavior:
I would expect that when I type prox.prop1., I would get typescript suggestions for Number.prototype, but instead, I get suggestions for Function.prototype. prox.prop1 will (according to typescript) still be callable as a function, but in runtime, it will clearly be a number and will throw an exception.

Statically evaluate the proxy traps and determine the type of thing being returned to offer proper typescript intellisense.

Metadata

Metadata

Assignees

No one assigned

    Labels

    BugA bug in TypeScriptDomain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptHelp WantedYou can do this

    Type

    No type

    Projects

    No projects

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions