How can moment js be imported with typescript

Question

I m trying to learn Typescript  While I don t think it s relevant  I m using VSCode for this demo   I have a package json that has these pieces in it        devDependencies          gulp     3 9 1        jspm     0 16 33        typescript     1 8 10          jspm          moment    npm moment  2 12 0          Then I have a Typescript class main js like this   import moment from  moment   export class Main       My gulpfile js looks like this   var gulp   require  gulp    var typescript   require  gulp-tsb    var compilerOptions                              rootDir    src                             sourceMap   true                           target    es5                            module    amd                            declaration   false                           noImplicitAny   false                           noResolve   true                           removeComments   true                           noLib   false                           emitDecoratorMetadata   true                           experimentalDecorators   true                          var typescriptCompiler   typescript create compilerOptions   gulp task  build   function       return gulp src   src        pipe typescriptCompiler         pipe gulp dest   dest           When I run gulp build  I get the message      main ts 1 25   Cannot file module  moment     If I use import moment   require  moment    then jspm will work and bring in the module when I run the application  but I m still receiving the build error  I also tried   npm install typings -g typings install moment --ambient --save   Instead of making the problem better though  it got worse  Now I get the above error on build as well as the following      typings browser ambient moment index d ts 9 21   Cannot find namespace  moment     If I go to the file provided by typings and add at the bottom of the file   declare module  moment    export   moment      I can get the second error to go away  but I still need the require statement to get moment to work in my main ts file and am still getting the first build error   Do I need to create my own  d ts file for moment or is there just some setup piece I m missing

User · Answer

1  install moment  npm install moment --save   2  test this code in your typescript file  import moment   require  moment     console log moment   format  LLLL

User · Answer

I ve just noticed that the answer that I upvoted and commented on is ambiguous  So the following is exactly what worked for me  I m currently on Moment 2 26 0 and TS 3 8 3   In code   import moment from  moment     In TS config        compilerOptions          esModuleInterop   true                  I am building for both CommonJS and EMS so this config is imported into other config files   The insight comes from this answer which relates to using Express  I figured it was worth adding here though  to help anyone who searches in relation to Moment js  rather than something more general

User · Answer

You need to import moment   the function and Moment the class separately in TS   I found a note in the typescript docs here          Note that ES6 modules cannot directly export callable functions      This file should be imported using the CommonJS-style         import x   require  someLibrary      So the code to import moment js into typescript actually looks like this   import   Moment   from  moment       let moment   require  moment        interface SomeTime     aMoment  Moment        fn             someTime aMoment   moment

User · Answer

Update  Apparently  moment now provides its own type definitions  according to sivabudh at least from 2 14 1 upwards   thus you do not need typings or  types at all   import   as moment from  moment  should load the type definitions provided with the npm package   That said however  as said in moment pull 3319 issuecomment-263752265 the moment team seems to have some issues in maintaining those definitions  they are still searching someone who maintains them      You need to install moment typings without the --ambient flag   Then include it using import   as moment from  moment

User · Answer

Not sure when this changed  but with the latest version of typescript  you just need to use import moment from  moment   and everything else should work as normal   UPDATE   Looks like moment recent fixed their import   As of at least 2 24 0 you ll want to use import   as moment from  moment

User · Answer

Still broken  Try uninstalling  types moment    So  I removed  types moment package from the package json file and it worked using   import   as moment from  moment    Newer versions of moment don t require the  types moment package as types are already included

User · Answer

via typings  Moment js now supports TypeScript in v2 14 1   See  https   github com moment moment pull 3280    Directly  Might not be the best answer  but this is the brute force way  and it works for me    Just download the actual moment js file and include it in your project  For example  my project looks like this           tree            -- main js      -- main js map      -- main ts      -- moment js    And here s a sample source code         import   as moment from  moment    class HelloWorld       public hello input string  string           if  input                       return  Hello  World                      else               return  Hello      input                           let h   new HelloWorld    console log moment   format  YYYY-MM-DD HH mm ss        Just use node to run main js

[typescript] How can moment.js be imported with typescript?

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