After execution, an unintended and strange file named [object Promise].metadata.json seems to be generated in the current working directory (cwd).
It appears that an await is missing in the part of the code that calculates the path for the metadata file.
Line 145 in 83e4287
minimum reproducible example is here
https://gist.github.com/podhmo/476b79c026d24c69abef532c8dcea292
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