Could not find a declaration file for module module-name path to module-name js implicitly has an any type

Question

I read how TypeScript module resolution works   I have the following repository   ts-stack di  After compiling the directory structure is as follows    -- dist         -- annotations d ts         -- annotations js         -- index d ts         -- index js         -- injector d ts         -- injector js         -- profiler d ts         -- profiler js         -- providers d ts         -- providers js         -- util d ts         -- util js  -- LICENSE  -- package json  -- README md  -- src         -- annotations ts         -- index ts         -- injector ts         -- profiler ts         -- providers ts         -- util ts  -- tsconfig json   In my package json I wrote  main    dist index js    In Node js everything works fine  but TypeScript   import  Injector  from   ts-stack di        Could not find a declaration file for module   ts-stack di     path to node modules  ts-stack di dist index js  implicitly has an  any  type    And yet  if I import as follows  then everything works   import  Injector  from   path to node modules  ts-stack di dist index js     What am I doing wrong

User · Answer

I ve tried everything here  but for me it was a completely different issue  I had to remove from my   d ts any import statements   import   SomeModuleType   from  3rd-party-module     After removing the error went away     Clarification  When we declare a module in a   d ts file  it s automatically picked up by the Typescript compiler as an ambient module  the one you don t need to import explicitly   Once we specify the import     from      the file now becomes a normal  ES6  module  and hence won t be picked up automatically  Hence if you still want it to behave as an ambient module  use a different import style like so   type MyType  import  3rd-party-module   SomeModuleType

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I had the same issue using a node module with a react application written in typescript  The module was successfully installed using npm i --save my-module  It is written in javascript and exports a Client class   With   import   as MyModule from  my-module   let client  MyModule Client   new MyModule Client      Compilation fails with the error   Could not find a declaration file for module  my-module           node modules my-module lib index js  implicitly has an  any  type    Try  npm install  types my-module  if it exists or add a new declaration   d ts  file containing  declare module  my-module       types my-module does not exist  so I added a my-module d ts file next to the one where my-module is imported  with the suggested line  I then got the error   Namespace   my-module   has no exported member  Client     The client is actually exported and works normally if I use it in a js app  Also  the previous message tells me that the compiler is looking in the right file   node modules my-module lib index js is defined in my-module package json  main  element     I solved the issue by telling the compiler I do not care about implicit any  that is  I set to false the following line of the tsconfig json file        noImplicitAny   false

User · Answer

TypeScript is basically implementing rules and adding types to your code to make it more clear and more accurate due to the lack of constraints in Javascript  TypeScript requires you to describe your data  so that the compiler can check your code and find errors  The compiler will let you know if you are using mismatched types  if you are out of your scope or you try to return a different type  So  when you are using external libraries and modules with TypeScript  they need to contain files that describe the types in that code  Those files are called type declaration files with an extension d ts  Most of the declaration types for npm modules are already written and you can include them using npm install  types module name  where module name is the name of the module whose types you wanna include     However  there are modules that don t have their type definitions and in order to make the error go away and import the module using import   as module name from  module-name   create a folder typings in the root of your project  inside create a new folder with your module name and in that folder create a module name d ts file and write declare module  module name   After this just go to your tsconfig json file and add  typeRoots            typings          node modules  types   in the compilerOptions  with the proper relative path to your folders  to let TypeScript know where it can find the types definitions of your libraries and modules and add a new property  exclude           node modules          typings   to the file   Here is an example of how your tsconfig json file should look like          compilerOptions              module    commonjs            noImplicitAny   true           sourceMap   true           outDir       dst             target    ESNEXT            typeRoots                        typings                      node modules  types                        lib                  es2016              exclude                    node modules                  typings            By doing this  the error will go away and you will be able to stick to the latest ES6 and TypeScript rules

User · Answer

For anyone else reading this  try renaming your  js file to  ts  Edit  You can also add  allowJs   true to your tsconfig file

User · Answer

Simply you can import it using require as following code   var     require  your module name

User · Answer

Here are two other solutions  When a module is not yours - try to install types from  types   npm install -D  types module-name   If the above install errors - try changing import statements to require      import   as yourModuleName from  module-name   const yourModuleName   require  module-name

User · Answer

simple to fix you re is       example d ts declare module  foo     if you want to declarate interface of object  Recommend for big project  you can use        example d ts declare module  foo          example     export function getName    string     How to use that  simple     const x   require  foo      or import x from  foo  x getName      intellisense can read this

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Could not find a declaration file for module  busboy    f  firebase-cloud-  functions functions node modules busboy lib main js  implicitly has an    any     type   Try  npm install  types busboy  if it exists or add a new declaration   d ts   the file containing  declare module  busboy     In my case it s solved  All you have to do is edit your TypeScript Config file  tsconfig json  and add a new key-value pair as   quot noImplicitAny quot   false

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If you need a quick fix  simply add this before the line of your import       ts-ignore

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This way works for me   1  add your own declaration in a declaration file such as index d ts maybe under the project root   declare module  Injector     2  add your index d ts to tsconfig json           compilerOptions              strictNullChecks   true           moduleResolution    node            jsx    react            noUnusedParameters   true           noUnusedLocals   true           allowSyntheticDefaultImports  true           target    es5            module    ES2015            declaration   true           outDir      lib            noImplicitAny   true           importHelpers   true                 include              src                 index d ts        declaration file path                 compileOnSave   false         -- edit  needed quotation marks around module name

User · Answer

You have to do is edit your TypeScript Config file  tsconfig json  and add a new key-value pair as   quot noImplicitAny quot   false  For Example   quot noImplicitAny quot   false   quot allowJs quot   true   quot skipLibCheck quot   true   quot esModuleInterop quot   true  continue

User · Answer

If you re importing a third-party module  foo  that doesn t provide any typings  either in the library itself  or in the  types foo package  generated from the DefinitelyTyped repository   then you can make this error go away by declaring the module in a file with a  d ts extension  TypeScript looks for  d ts files in the same places that it will look for normal  ts files  as specified under  files    include   and  exclude  in the tsconfig json      foo d ts declare module  foo     Then when you import foo it ll just be typed as any       Alternatively  if you want to roll your own typings you can do that too      foo d ts declare module  foo        export function getRandomNumber    number      Then this will compile correctly   import   getRandomNumber   from  foo   const x   getRandomNumber       x is inferred as number   You don t have to provide full typings for the module  just enough for the bits that you re actually using  and want proper typings for   so it s particularly easy to do if you re using a fairly small amount of API     On the other hand  if you don t care about the typings of external libraries and want all libraries without typings to be imported as any  you can add this to a file with a  d ts extension   declare module        The benefit  and downside  of this is that you can import absolutely anything and TS will compile

User · Answer

I was getting this too  had me baffled for a while  even with the module and types already installed and reloading my IDE several times   What fixed it in my case was terminating terminal processes  removing node modules  clearing the node package manager cache and doing a fresh install then re-loading the editor

User · Answer

Check the  quot tsconfig json quot  file for compilation options  quot include quot  and  quot exclude quot   If it does not exist  just add them by informing your root directory     tsconfig json      quot compilerOptions quot              quot include quot          quot src quot            quot exclude quot          quot node modules quot           I solved my silly problem just by removing the extension statement  quot   spec ts quot  from the  quot exclude quot   because when including the  quot import quot  in these files  there were always problems

User · Answer

Unfortunately it s out of our hands whether the package writer bothers with a declaration file  What I tend to do is have a file such index d ts that ll contain all the missing declaration files from various packages   Index ts   declare module  v-tooltip   declare module  parse5   declare module  emoji-mart-vue-fast

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That feeling when you are looking out for two days and find it like this  just remove  js from  main    dist index js  in package json and everything works fine    main    dist index     UPD  this answer relative if you have your own npm package  if not - see my answer below   And if above answer not resolved import your module  try just add typings in package json    main    dist index    typings    dist index     Of course  here folder dist - it s where stores your module s files

[typescript] Could not find a declaration file for module 'module-name'. '/path/to/module-name.js' implicitly has an 'any' type

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