Typescript import as vs import require

Question

I am using TypeScript with Express Node js   For consuming modules  the TypeScript Handbook shows the following syntax   import express   require  express     But also the typescript d ts file shows   import   as express from  express    I also searched the MSDN blog but could not find anything   Which one is more correct as of early 2016  What are the differences between the two  if any   Where is the best source to find information on the latest syntax to use so I can find this information in the future

User · Answer

import   as express from  express     This is the suggested way of doing it because it is the standard for JavaScript  ES6 2015  since last year   In any case  in your tsconfig json file  you should target the module option to commonjs which is the format supported by nodejs

User · Answer

These are mostly equivalent  but import   has some restrictions that import       require doesn t   import   as creates an identifier that is a module object  emphasis on object  According to the ES6 spec  this object is never callable or newable - it only has properties  If you re trying to import a function or class  you should use  import express   require  express      or  depending on your module loader   import express from  express     Attempting to use import   as express and then invoking express   is always illegal according to the ES6 spec  In some runtime transpilation environments this might happen to work anyway  but it might break at any point in the future without warning  which will make you sad

[javascript] Typescript import/as vs import/require?

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