Detecting `import * as name` token

Question

I'm writing some code that I want to apply only to the token from

import * as name from 'module-name'

syntax.

Is there a way to do that? I recall there is a

__ESModule

flag or something similar but that is not in the official spec, so I'm not sure if that is the right approach (and I can't find the exact article talking about it, a reference would be of great help).

i.e. this is what I want (using TypeScript in the example):

import * as someModule from 'module-name'

import someDefault from 'module-name'

import { someNamed } from 'module-name'

import otherImport = require('cjs-module')



let somethingElse = {} // anything

checkIsStarModule(someModule) // true

checkIsStarModule(someDefault) // false

checkIsStarModule(someNamed) // false

checkIsStarModule(otherImport) // false

checkIsStarModule(somethingElse) // false

And what's the proper name to describe

import * as name ...

syntax? :)

EDIT: adding some context to the question.

I'm doing something similar to

aurelia

's

FrameworkConfiguration

.

And I want to apply it only to

someModule

as described above. This is because I don't want to accidentally execute

configure()

method on something that is not a module.

My API is

get(key: Newable<T> | T): Promise<T>

and I do allow consumers to throw in anything as

key

(

Newable<T>

is simply any class).

Thanks @estus on

__esModule

, and I realize that it is only for interop thus not useful in this context.

Answer 1

There is nothing that really distinguishes module namespace objects from others, anyone could create an object like that. You can test for

function isModuleNamespaceLike(o) {
    return o === Object(o)
    && o[Symbol.toStringTag] === "Module"
    && Object.getPrototypeOf(o) === null
    && !Object.isExtensible(o)
    && Object.getOwnPropertyNames(o).every(function(p) {
        var d = Object.getOwnPropertyDescriptor(o, p);
        return d.enumerable && !d.configurable;
    });
}

or try to look for __esModule, but that depends on your transpiler.

Detecting `import * as name` token

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