Firebase Storage emulator does't support getSignedUrl

I have the line

onst [url] = await blob.getSignedUrl({ action: 'read', expires: + 60 * 1000, contentType: mimetype })

When I run my unit-tests with the Firebase storage emulator I got the error:

Could not load the default credentials. Browse to for more information

How can I use getSignedUrl with Firebase emulator?

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