Exporting default value from a module in Typescript declaration file

Question

Let's say I have a declarations file foo.d.ts:

declare namespace foo {
  interface Bar {
    (): void;
  }
}

declare var foo: foo.Bar;
export default foo;

If I compile this:

import Foo from './foo';
Foo();

The resulting output is:

"use strict";
var foo_1 = require('./foo');
foo_1["default"]();

However this code won't run as foo_1 is a function and has no property default. How can I get the output to be foo_1() instead of foo_1["default"]()?

have you configured a module in the tsconfig.json file? You probably shouldn't in your case. — toskv
– toskv, Commented Jan 10, 2017 at 15:20
No, this is intended to be a declarations file to accompany a library. — Andrew
– Andrew, Commented Jan 10, 2017 at 15:26
you should never have a declare namespace foo {} and a declare var foo in the same file. try renaming one of those. — chharvey
– chharvey, Commented Dec 22, 2018 at 0:14

artem · Accepted Answer · 2017-01-10 16:44:45Z

3

Use

export = foo;

instead of export default foo; in your declaration file

and use import require when importing:

import Foo = require('./foo');

Export assignment/import require is special syntax in typescript for dealing with node modules with exports like

module.exports = function someFunction() {}

answered Jan 10, 2017 at 16:44

artem

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