typescript error TS2693 Promise only refers to a type but is being used as a value here

Question

I am trying to use Typescript for my AWS Lambda and i am getting the following errors where ever I use promises    error TS2693   Promise  only refers to a type  but is being used as a value here    I tried using the following variations in the code   Using the Promise constructor  responsePromise   new Promise  resolve  reject    gt                        return reject new Error  missing is needed data                         using Promise reject  responsePromise   Promise reject new Error  Unsupported method    request httpMethod         Versions  Following are the versions in my dev dependencies    typescript     2 2 2    types aws-lambda    0 0 9     types core-js     0 9 40     types node     7 0 12     Contents of tsconfig json         compileOnSave   true       compilerOptions              module    commonjs               typeRoots        typings      node modules  types             target    es5               types       core-js              noImplicitAny   true           strictNullChecks   true           allowJs   true           noEmit   true           alwaysStrict   true           preserveConstEnums   true           sourceMap   true           outDir    dist            moduleResolution    Node            declaration   true           lib                  es6                        include              index ts            lib      ts              exclude              node modules                 spec ts            I am using grunt-ts with the following configuration for running ts task   ts                app                    tsconfig                        tsconfig     tsconfig json                       ignoreSettings  true                                        I tried with the solution mentioned in I get   ts    39 Promise  39  only refers to a type  but is being used as a value here but no luck

User · Answer

I had the same problem and this saved me from the problem in second:

write in console this:

npm i --save bluebird
npm i --save-dev @types/bluebird @types/[email protected]

in the file where the problem is copy paste this:

import * as Promise from 'bluebird';

User · Answer

The same error here  I fixed this  using  module    ES6  in tsconfig

User · Answer

Just change the target to  ES2017  in tsconfig json file   this is my tsconfig json file     compilerOptions        Basic Options         target    ES2017        Specify ECMAScript target version   ES3   default    ES5    ES2015    ES2016    ES2017   or  ESNEXT           module    commonjs      Specify module code generation   none    commonjs    amd    system    umd    es2015   or  ESNext           declaration   true      Generates corresponding   d ts  file          sourceMap   true        Generates corresponding   map  file          outDir      dist        Redirect output structure to the directory          strict   true           Enable all strict type-checking options             include          src               exclude          node modules

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Finally tsc started working without any errors  But multiple changes  Thanks to Sandro Keil  Pointy  amp  unional   Removed dt aws-lambda Removed options like noEmit declaration Modified Gruntfile and removed ignoreSettings   tsconfig json         compileOnSave   true       compilerOptions              module    commonjs            target    es5            noImplicitAny   false           strictNullChecks   true           alwaysStrict   true           preserveConstEnums   true           sourceMap   false           moduleResolution    Node            lib                  dom                es2015                es5                es6                        include                           src                   exclude                node modules            Gruntfile js  ts                app                    tsconfig                        tsconfig     tsconfig json

User · Answer

I had the same issue with the aws-sdk and I solved it by using  target    es2015   This is my tsconfig json file          compilerOptions              outDir      dist             sourceMap   false           noImplicitAny   false           module    commonjs            target    es2015              include              src                   exclude              node modules                 spec ts

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Please be aware that if you are running the tsc command with a file name ie   tsc testfile ts   then the tsconfig json compiler configuration file is ignored  The solution is to run either the tsc command on its own  in which case all  ts files in the directory will be compiled  unless you have edited the tsconfig json to include a set of files   see  using the files property     https   www typescriptlang org docs handbook tsconfig-json html

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Solved by changing the target in compilerOptions      compilerOptions          module    es2015        target    es2015        lib              es2016            dom              moduleResolution    node        noImplicitAny   false       sourceMap   false       emitDecoratorMetadata   true       experimentalDecorators   true       outDir      public js app      exclude          node modules        public js        assets app polyfills ts      angularCompilerOptions          skipMetadataEmit   true

User · Answer

Encounter the same error today and solved it with   npm i --save-dev   types es6-promise   Update   add   import  Promise  from  es6-promise

User · Answer

I had this error but I resolved it by using this command  my ts file name is promises-fs ts   tsc promises-fs ts --target es6  amp  amp  node promises-fs js   and the error is gone

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I got rid of this same error in index ts with these combined properties   In tsconfig json      compilerOptions          target    ES6    And in package json      main    index ts      scripts          start    tsc -p tsconfig json  amp  amp  node index js

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I solved this by adding below code to tsconfig json file    lib          ES5        ES2015        DOM        ScriptHost

User · Answer

I had the same error and I fixed it with this configuration   File  tsconfig json       compilerOptions          target    es2015                              module    commonjs                            strict   true                                 esModuleInterop   true

User · Answer

Had the same issue with typescript and the aws-sdk  The solve was to change the target to es6   My complete tsconfig json file             compilerOptions                    outDir    dist                   sourceMap  true                  noImplicitAny  true                  module  commonjs                  target  es6                  jsx  react                  allowJs  true                    include                      src

User · Answer

I had the same issue until I added the following lib array in typeScript 3 0 1  tsconfig json       compilerOptions          outDir    lib        module    commonjs        allowJs   false       declaration   true       target    es5        lib     dom    es2015    es5    es6         rootDir    src          include                  exclude     node modules         spec ts

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Having spent lot of time trying to fix this  I had no luck with any solution provide here or elsewhere   But then later realised it wasn t so much as just solving the issue  But you also need to RESTART the VSCODE for it to take affect

User · Answer

Add below line to file where error is being thrown This should fix the issue  declare var Promise  any    P S  This is definitely not the optimal solution

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If you re using the DefinitelyTyped repository in your project you might be experiencing this recent issue   A decent workaround you might use  other than waiting for an updated build of the definitions file or refactoring your TS code  is to specify an explicit version build for the core-js typings rather than let Visual Studio pick the latest most recent one  I found one that seems to be unaffected by this problem  in my case at least   you can use it replacing the following line from your package json file      scripts          postinstall    typings install dt core-js --global        With the following one      scripts          postinstall    typings install dt core-js 0 9 7 20161130133742 --global        This fixed my issue for good  However  is highly recommended to remove the explicit version build reference as soon as the issue will be released   For further info regarding this issue  you can also read this blog post that I wrote on the topic

User · Answer

Here is my tip  Tested with vscode 1 21 1  on MAC   Put below config to tsconfig json   lib      es2016    dom      into  compilerOptions  Restart IDE  this action is required  D

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npm i --save-dev   types es6-promise  after up command  you d better check tsconfig json make sure the  target  must great than  es6   maybe tsc not support es5 yet

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None of the up-voted answers here work for me  Here is a guaranteed and reasonable solution  Put this near the top of any code file that uses Promise     declare const Promise  any

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Core-js did not work for me as it caused other issues  however  simply installing the latest version of npm i  types es6-promise --save-dev got rid of the issues  The issues for me stemmed from compiling an sdk that was using rxjs  Here is the error I was getting    node modules rxjs Observable d ts 59 60   error TS2693  Promise only refers to a type  but is being used as a value here

User · Answer

Well  this might be counter-intuitive but I solved this adding esnext to my lib         compilerOptions          lib              esnext              target    es5           The FIX  as suggested by the compiler is to     Try changing the lib compiler option to es2015 or later

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