MongDB找不到Promise类型定义

Question

I have created a new project, installed few type definitions (from DefinitelyTyped) and made a basic src/go.ts file.

Whenever I transpile the code, I get a ton of TS2304: Cannot find name 'Promise' errors!
The ./typings/mongodb/index.d.ts is referencing the Promise , but the compiler does not seem to find that.
Please note that I have dt~promise installed as well.

Screenshot (Errors on the left side, type definitions installed and the app code are on the right)

Content of typings.json :

{
  "globalDependencies": {
    "dotenv": "registry:dt/dotenv#2.0.0+20160327131627",
    "express": "registry:dt/express#4.0.0+20160708185218",
    "express-serve-static-core": "registry:dt/express-serve-static-core#4.0.0+20160805091045",
    "mime": "registry:dt/mime#0.0.0+20160316155526",
    "mongodb": "registry:dt/mongodb#2.1.0+20160602142941",
    "mongoose": "registry:dt/mongoose#4.5.4+20160807120805",
    "mongoose-promise": "registry:dt/mongoose-promise#4.5.4+20160720003345",
    "node": "registry:dt/node#6.0.0+20160807145350",
    "promise": "registry:dt/promise#7.1.1+20160602154553",
    "serve-static": "registry:dt/serve-static#0.0.0+20160606155157"
  }
}

Any thoughts?

Answer 1

I've experienced the same issue (more or less, using @types instead of typings) and was able to solve it by installing the type definitions for CoreJS .

Screenshots

Apologize for linking to a library, this is my first post so I am unable to provide more than two links per post.

Image explanations:

• First screenshot shows similar error, type definition file for MongoDB is unable to find 'Promise'.
• Install type definitions for CoreJS. Note that I am getting my type definitions through NPM and not Typings. So to do something similar in Typings you would run something like:
  • typings install dt~core-js --save --global
• Third screenshot shows build command with no errors on output 😁

I hope this resolves your issue.

Answer 2

I had the same issue installing lastest version of mongodb and mongoose typings.

The new definition file for mongodb assumes you are using ES6 promise so if you change the target of the typescript compiler in the tsconfig.json to es6 it should do the trick :

tsconfig.json:

{
    "compilerOptions": {
        ...
        "target": "ES6",
        ...
    }
}

Answer 3

For typings: typings install core-js --ambient --save . It works for me.