Ts-morph: How to ignore duplicate export results from sourceFile.getExportedDeclarations() ?

[HamedFathi]

sourceFile.getExportedDeclarations() returns duplicate (any number that has been exported) nodes however this is not wrong but I need just unique nodes.

sample.ts

export class X {}

index.ts

export { X } from './sample';

It returns 2 records for X first from sample.ts and second index.ts while both export one thing and one of them is enough.
I have a project and they export anything multiple times so I can not get one export per type.

How to get just unique list of exported nodes? Any unique id per node? Distinct?

[lazarljubenovic]

If you're only interested in names, map the array to names and then create a Set out of it. This will remove duplicates.

[HamedFathi]

@lazarljubenovic

What name exactly? I have some

Export default functions
Destructuring objects

Or, What about an interface and a class in the same file with same name?

[dsherret]

@HamedFathi I don't think I understand the question because when I try this I only get one export as I would expect:

const project = new Project({ useVirtualFileSystem: true });
const sampleSourceFile = project.createSourceFile("/sample.ts", "export class X {}");
const indexSourceFile = project.createSourceFile("/index.ts", "export { X } from './sample';");
const exportedDeclarations = indexSourceFile.getExportedDeclarations();

expect(exportedDeclarations.size).to.equal(1);
expect(exportedDeclarations.get("X")!.length).to.equal(1);
expect(exportedDeclarations.get("X")![0].getText()).to.equal(`export class X {}`);

Could you show a specific example that has duplicates?

[lazarljubenovic]

I was under impression that OP's running it for both files:

It returns 2 records for X first from sample.ts and second index.ts while both export one thing and one of them is enough.

I guess this is why a reproduction is always a good idea :smile:

[HamedFathi]

@dsherret

So strange, I will check it again but because of duplicate exports, Even I made Id for each node to find duplicates!!! Here

id: getSha256(node.getFullText() + getSourceFilePath()),

The project I'm handling is big and it's hard to find a good example, but I'm sure I had some duplicate exports.
Maybe, I have done something wrong!!! I should check it again.

For now, I am closing this.
Thank you both.

[dsherret]

@HamedFathi yeah, please let me know if you find duplicates! That would most likely indicate a bug and I'd like to fix it.