Angular: Runtime will report an error due to metadata collected containing an unsupported Lambda

Question

Angular: Runtime will report an error due to metadata collected containing an unsupported Lambda

Within my Angular application, I am attempting to implement a factory provider in one of my modules:

export function retrieveMyFactory(): () => Window {
  return () => window;
}

@NgModule({
  providers: [
    { provide: WindowRef, useFactory: retrieveMyFactory() },
  ],
})
export class MyModule {}

This implementation is running into an issue, resulting in the following error message:

An error was detected in the metadata generated for the exported symbol 'MyModule':

The collected metadata contains an error that will be reported during runtime: Lambda not supported.

angular typescript angular-providers angular-factory angular-dependency-injection

Answer 1

Answer №1

I stumbled upon a simple fix mentioned in a GitHub thread: Dealing with Arrow lambda issue in static function shared by haochi

The workaround entails:

storing the result in a variable and then returning that variable

In my scenario, I resolved the issue by replacing:

export function getMyFactory(): () => Window {
  return () => window;
}

with:

export function getMyFactory(): () => Window {
  const res = () => window;
  return res;
}

Answer 2

I stumbled upon a simple fix mentioned in a GitHub thread: Dealing with Arrow lambda issue in static function shared by haochi

The workaround entails:

storing the result in a variable and then returning that variable

In my scenario, I resolved the issue by replacing:

export function getMyFactory(): () => Window {
  return () => window;
}

with:

export function getMyFactory(): () => Window {
  const res = () => window;
  return res;
}

Answer 3

Answer №2

To implement dynamic behavior, simply include the // @dynamic comment in your code:

// @dynamic
export function getMyFactory(): () => Window {return () => window;}

For more detailed instructions, refer to the official Angular documentation

Answer 4

To implement dynamic behavior, simply include the // @dynamic comment in your code:

// @dynamic
export function getMyFactory(): () => Window {return () => window;}

For more detailed instructions, refer to the official Angular documentation

Answer 5

Answer №3

I encountered a similar issue while working with an Angular library.

To resolve it, I bypassed the error by updating the setting

"strictMetadataEmit": false,

in the configuration file tsconfig.lib.json within the section angularCompilerOptions.

Answer 6

I encountered a similar issue while working with an Angular library.

To resolve it, I bypassed the error by updating the setting

"strictMetadataEmit": false,

in the configuration file tsconfig.lib.json within the section angularCompilerOptions.

Answer 7

Answer №4

Encountering a similar problem when attempting to return a promise as a function, I made the following modification:

export function myFunc(): Function {
    const result = () => ...
    return result;
}

Instead, I updated it to:

export function myFunc(){
    const result = () => ...
    return result;
}

Answer 8

Encountering a similar problem when attempting to return a promise as a function, I made the following modification:

export function myFunc(): Function {
    const result = () => ...
    return result;
}

Instead, I updated it to:

export function myFunc(){
    const result = () => ...
    return result;
}

Angular: Runtime will report an error due to metadata collected containing an unsupported Lambda

Answer №1

Answer №2

Answer №3

Answer №4

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