Installing express in typings: A beginner's guide

I'm currently incorporating expressjs into my application.

Following its installation using 

typings install express --ambient --save
, I run tsc. However, two errors are returned:

typings/main/ambient/express/index.d.ts(17,34): error TS2307: Unable to locate module 'serve-static'. typings/main/ambient/express/index.d.ts(18,27): error TS2307: Unable to locate module 'express-serve-static-core'.

To address this, I attempted to install both:

typings install serve-static --ambient --save
typings install express-serve-static --ambient --save

Upon running tsc again, another error surfaced:

typings/main/ambient/serve-static/index.d.ts(79,24): error TS2307: Unable to locate module 'mime'.

How can these issues be resolved? Is there a way to automatically install all dependencies for express?

typescriptdefinitelytypedtsd

Answer №1

After the release of Typescript 2.0, there have been some changes that you should be aware of:

To install typescript, use the command below:

npm install -g <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="285c51584d5b4b5a41585c681a0618">[email protected]</a>

In order to install express typings, use this command:

npm install --save @types/express

Previously, typings used to be installed globally, but now they are installed in the directory node_modules/@types/express.

Once you have done npm install of types, your package.json will contain the following snippet:

"dependencies": {
    "@types/express": "^4.0.33"
  }

Answer №2

{
  "dependencies": {
    "express": "registry:dt/express#4.0.0+20160708185218",
    "express-serve-static-core": "registry:dt/express-serve-static-core#4.0.0+20160715232503",
    "mime": "registry:dt/mime#0.0.0+20160316155526",
    "node": "registry:dt/node#6.0.0+20160621231320",
    "serve-static": "registry:dt/serve-static#0.0.0+20160606155157"
  }
}

This is my current Typings.json file with the necessary dependencies listed.

Answer №3

Recently, I encountered a similar issue which seems to be a duplicate of:

Importing node and express with typings in TypeScript

After installing serve-static and express-serve-static, I faced errors indicating that 'mime' and 'http' were missing.

To resolve the missing references, I had to install node typings for http and mime typings for mime as shown below:

typings install mime --ambient --save
typings install node --ambient --save

Answer №4

The solution that effectively resolved my issue (at the time of writing) was: 

typings install dt~express --global --save
(replace 'ambient' with 'global')

If you need to find similar modules, you can utilize the command typings search express (this also provides source information)

Answer №5

Having faced this issue myself, I discovered that it is essential to not only have the actual NodeJS module installed but also its corresponding typing.

Therefore, after correctly configuring TypeScript in your project, you must ensure the installation of both the NodeJS dependency and the @types dependency.

npm install express --save

npm install --save @types/express

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