Mistakenly importing the incorrect version of Angular

Question

Mistakenly importing the incorrect version of Angular

While working on my Angular 1 app in typescript, I faced an issue when importing angular using the following syntax:

   import * as angular from 'angular';

Instead of importing angular from angular, it was being imported from angular-mocks. This caused a failure in my ILogService implementation.

ERROR in ./app/shared/Logger.factory.ts (38,7): error TS2420: Class 'Logger' incorrectly implements interface 'ILogService'. Types of property 'debug' are incompatible. Type '(...argument: any[]) => void' is not assignable to type 'ILogCall'.

Even while trying to navigate to 'angular' from vscode, it redirected me to the angular-mocks angular definition instead of the actual angular library. This navigation should point to angular and not the mock library...

Any suggestions on how to resolve this problem?

EDIT

Here is the custom service implementation that is causing the typescript compilation error mentioned above:

class Logger implements ng.ILogService {
     info(message:string) { //some custom logic in info method}
}

angular.service('logger', Logger)

angular typescript angular-mock

Answer 1

Answer №1

The reason for this issue is that angular-mock's typing is an extension of angular's typing. To clarify, a proper ILogCall interface should look like this:

interface ILogCall {
    (...args: any[]): void;   //defined in @types\angular\index.d.ts
    logs: string[];    //defined in @types\angular-mocks\index.d.ts
}

In your code snippet:

info(message:string) { //custom logic in info method}

You must ensure that you return a complete ILogCall object (with all properties). While the suggestions from @TheChetan and @Natarajan Nagarajugari are helpful, there may be implications for writing TypeScript unit tests.

My proposed solution for the info(message:string) function is as follows:

info(message:string)
{
    var logCall: any = (...args: any[]) => {};
    logCall.logs = //something;

    return logCall as ng.ILogCall;
}

Answer 2

The reason for this issue is that angular-mock's typing is an extension of angular's typing. To clarify, a proper ILogCall interface should look like this:

interface ILogCall {
    (...args: any[]): void;   //defined in @types\angular\index.d.ts
    logs: string[];    //defined in @types\angular-mocks\index.d.ts
}

In your code snippet:

info(message:string) { //custom logic in info method}

You must ensure that you return a complete ILogCall object (with all properties). While the suggestions from @TheChetan and @Natarajan Nagarajugari are helpful, there may be implications for writing TypeScript unit tests.

My proposed solution for the info(message:string) function is as follows:

info(message:string)
{
    var logCall: any = (...args: any[]) => {};
    logCall.logs = //something;

    return logCall as ng.ILogCall;
}

Answer 3

Answer №2

give this a shot...

import * as _angular_ from 'angular';

declare global {
const angularInstance: typeof _angular_;
}

Hopefully this solution works for you

Answer 4

give this a shot...

import * as _angular_ from 'angular';

declare global {
const angularInstance: typeof _angular_;
}

Hopefully this solution works for you

Mistakenly importing the incorrect version of Angular

Answer №1

Answer №2

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