File editor error with ESPHome secrets: "cannot merge mappings; the provided source object is unacceptable"

[7wells]

Describe the issue you are experiencing

The problem

Hello!

I enter in file /homeassistant/esphome/secrets.yaml the following (and only) line:

<<: !include ../secrets.yaml

The File editor then complains with a red exclamation mark symbol and the following error:

cannot merge mappings; the provided source object is unacceptable (1:29)

 1 | <<: .include ../secrets.yaml
---------------------------------^

Nevertheless, an ESPHome node correctly gets the secrets from one level above, i.e. from /homeassistant/secrets.yaml.

Please note:
I've entered: <<: !include ../secrets.yaml
FE complains: <<: .include ../secrets.yaml

Is the File editor misinterpreting the trailing exclamation mark (!) as a period (.)?

What type of installation are you running?

Home Assistant OS

Which operating system are you running on?

Home Assistant Operating System

Which add-on are you reporting an issue with?

File editor

What is the version of the add-on?

5.8.0

Steps to reproduce the issue

1. Enter in file /homeassistant/secrets.yaml the following line (example):
   wifi_password: "blablabla"

2. Enter in file /homeassistant/esphome/secrets.yaml the following (and only) line:
   <<: !include ../secrets.yaml

3. Observe the File editor error message:

cannot merge mappings; the provided source object is unacceptable (1:29)

 1 | <<: .include ../secrets.yaml
---------------------------------^

System Health information

No response

Anything in the Supervisor logs that might be useful for us?

No response

Anything in the add-on logs that might be useful for us?

No response

Additional information

No response

[7wells]

@danielperna84
Please let me know if something is unclear or missing in my report. Thank you so much! ❤️

[danielperna84]

Due to private commitments I'm not able to work on this project. Somebody else has to contribute a fix, which I could then merge into the code.

[7wells]

@frenck
I'm sorry to ask, but do you know somebody who could look into this? I'm no programmer but am willing to test or help in other ways, if deemed beneficial.

[frenck]

Sorry, can't help with this.

[Floriszz]

I have the same. checked the sectets.yaml file in the esphome directory from a recent backup and can confirm that it really has a '!'. So it is an issue in the frontend/file editor.