Typescript 2.0 @Types/Express | Cannot find module

Question

The Express type definitions for Typescript 2.0 result in unexpected errors when executing after running npm install @types/express and tsc -t ES6 for ES6. The code compiles fine without the ES6 flag. Can anyone explain? I also have issues with other type definitions such as ssh2.

Here are the steps to reproduce:

> mkdir humbug
> cd humbug
> touch blank.ts
> tsc blank.ts
> tsc -t ES6 .\blank.ts

Everything is fine so far.

> npm init .
...
> npm install @types/express

Things start going bad now

> tsc blank.ts
> tsc -t ES6 .\blank.ts
node_modules/@types/express/index.d.ts(16,30): error TS2307: Cannot find module 'serve-static'.
node_modules/@types/serve-static/index.d.ts(16,20): error TS2307: Cannot find module 'mime'.

Ok, well I better make sure that the types for serve-static and mime are installed.

> npm install @types/serve-static @types/mime
[email protected] C:\Users\me\Desktop\humbug
`-- (empty)

npm WARN [email protected] No description
npm WARN [email protected] No repository field.
npm ERR! code 1

Weird I got an ERR! code but the types were downloaded, Lets try compiling again

> tsc blank.ts
> tsc -t ES6 .\blank.ts
node_modules/@types/express/index.d.ts(16,30): error TS2307: Cannot find module 'serve-static'.
node_modules/@types/serve-static/index.d.ts(16,20): error TS2307: Cannot find module 'mime'.

Same error as last time.

My Environment:

Windows 10
Node v6.6.0
TSC 2.0.3

Other definitions with the same problem:

node_modules/@types/cors/index.d.ts(9,26): error TS2307: Cannot find module 'express'.
node_modules/@types/multer/index.d.ts(6,26): error TS2307: Cannot find module 'express'.
node_modules/@types/ssh2/index.d.ts(26,8): error TS2307: Cannot find module 'ssh2-streams'.

mattuu · Accepted Answer · 2016-11-13 20:34:35Z

1

I am still learning all this stuff (being .NET programmer), but I had similar issue this afternoon and this configuration seem to be working:

{
    "compilerOptions": {
        "module": "system",
        "noImplicitAny": true,
        "removeComments": true,
        "preserveConstEnums": true,
        "moduleResolution": "node",
        "sourceMap": true,
        "typeRoots": [ "node_modules/@types" ]
    },
    "include": [
        "src/**/*"
    ],
    "exclude": [
        "node_modules",
        "node_modules/@types",
        "**/*.spec.ts"
    ]
}

answered Nov 13, 2016 at 20:34

mattuu

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1 Comment

Ronan Quillevere Over a year ago

I think only the typeRoots is useful, in my case I needed to go up one level "typeRoots": [ "../node_modules/@types" ]

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Typescript 2.0 @Types/Express | Cannot find module

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Other definitions with the same problem:

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