CODEWITHSUNDEEP
mongoosetypescriptpromise
jeffrey chan
jeffrey chan

Reputation: 175

Type 'Promise<Document>' is not assignable to type 'Promise<Document>'

I'm using Promise to void callback hell.

But I met the typecast issue.

here is my method or function define:

findById(entityId: string): Promise<mongoose.Document> {
    return this._model.findById(entityId).exec();
}

The typescript tips some error about:

[ts] Type 'Promise' is not assignable to type 'Promise'. Types of property 'then' are incompatible. Type '(onFulFill: (result: Document) => void | U | Promise, onReject?: (err: any) => void | U | P...' is not assignable to type '{ (onfulfilled?: (value: Document) => TResult | PromiseLike, onrejected?: (reas...'. Type 'Promise' is not assignable to type 'Promise'. Property 'catch' is missing in type 'Promise'.

I want to know how to void this issue?

Upvotes: 1

Views: 3649

Answers (1)

Saulo Vallory
Saulo Vallory

Reputation: 979

Check for different promise types being used. In my case, one file was importing es6-promise while the other wasn't.

Upvotes: 0

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