What this snippet does
depends_on only orders startup; the database may still be initialising when the API connects.
Expected output
error: connect ECONNREFUSED 172.19.0.2:5432
Why practise typing this
Typing compose basics code builds muscle memory for the symbols and indentation Docker uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
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