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In JS, aliasing exports = {} omits the expected string index signature #25687
Description
From adonis-framework in the user tests.
// Filename: util.js
const util = exports = module.exports = {}
util.existy = function() { }Expected behavior:
No error, and import('util') has a property existy. (Ideally util would also have a property existy inside util.js, but this is not true in 2.9.2 either.)
Actual behavior:
Error: Property 'x' does not exist on type '{}', but require('util') does have a property existy: () => void.
Activity
sandersn commentedon Jul 16, 2018
#25619 causes module.exports assignments to be contextually typed, and we don't add an index signature when there is a contextual type.
This wouldn't be a problem, except that
utilwasn't really the type of the module anyway, so without the index signature,existydidn't really exist.