tonsky / tonsky/datascript

Warn about unused vars in query

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Dominant language
Clojure
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Description

Might save some time finding typos

[:find ?day ?meal
 :where [?day :day/dailies ?daily]
        [?dayily :daily/meal ?meal]]

Expected output:

WARN '?daily', '?dayily' are only referenced once, possible typo? Or consider replacing them with '_'.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the example query and expected warning as the specification, then locate the query-processing entry point that handles variable references. Add a regression check for the reported typo case and verify that genuinely intentional single-use variables can still be replaced with '_'. Done means the warning is emitted with the expected variable names and wording.

Written by the indexing model from the issue text.

Assessment

Tech stack
clojure
Domain
databases
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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