Unable to import module from typescript

[mleguen]

This is a follow-up of #12

The proposed solution does not work either:

import * as timestamp from 'time-stamp';

leads to :

error TS2349: This expression is not callable.
  Type 'typeof import("[...]/node_modules/time-stamp/index")' has no call signatures.

[mleguen]

The only way I found to avoid this error is to add the following line in index.js:

timestamp.default = timestamp;

and to switch back in my code to:

import timestamp from 'time-stamp';

However I can find no way to write an index.d.ts compatible with the current index.js.

[jonschlinkert]

want to do a pr?

[mleguen]

@jonschlinkert I do not see at the moment how to do it without impacting too much the current behavior of index.js.

[fregante]

If you use module.exports = foo in your JS file, the TypeScript definition should be export = foo. Example sindresorhus/memoize#32

export default is only for ES Modules and time-stamp isn't one; adding a default export won't change it into one.

TypeScript offers esModuleInterop but it only lets users of a CJS module to import it via import mod from 'module', this module doesn't need any special syntax to make it compatible.

[mleguen]

@fregante OK, thank you. I will experiment on this in the coming days to see if I can do a PR.

[mleguen]

PR submitted

[luckydrq]

I commented at the PR(#18 (comment)) and make a new PR(#20) to solve this. In a word, import foo = require('foo') need module foo have exports.default exported, or it would not work.

[papb]

In a word, import foo = require('foo') need module foo have exports.default exported, or it would not work.

This is not true. For import foo = require('foo') to work, the module needs to have export = foo in the entrypoint.