[Query] Signature

Generated from 'wiki-query.ts' on 2026-11-08, 15:21:58 UTC (v2.17.4), do not edit directly.

Inspects the signature database: packages, function signatures, source and documentation links.
This query is requested with the type signature.
Run in the REPL: :query @signature [<pkg>[@<version>]] [<pkg>::<fn> | <fn>] [--param <name>[,...]] [--required <n>] [<name>(<arg>, [<role>], *) [<prop>]] [--cg] [--cg-max <n>] [--help]

This query is the read-side interface to flowR's signature database—the very same database that resolves library() and :: calls during the dataflow analysis. It lets you ask what flowR actually knows about a package or a function, without needing R or a network connection.

What you get back depends on how specific you are:

The version property accepts an exact version, a glob (3.*), a semver range (>=3.0.0), or a release-date bound (<=2026, >=2021.05). Without it, the release that flowR resolved for the analyzed script is used, so the signature you see is the one the analysis actually assumed.

Given a script such as:

library(dplyr)
lead(1:10, n = 1)

we can inspect the signature of the function it calls:

[ { "type": "signature",   "package": "dplyr",   "function": "lead" } ]

{"signature":{".meta":{},"databases":[{"scope":"current","version":2,"date":"2026-07-19"},{"scope":"base","version":2,"date":"2026-07-19"},{"scope":"history","version":2,"date":"2026-07-19"}],"packageCount":23765,"sourceCount":3,"function":{"name":"lead","package":"dplyr","version":"1.2.1","exported":true,"properties":["exported","can-throw"],"parameters":[{"name":"x","props":2},{"name":"n","props":0,"default":"1L"},{"name":"default","props":0,"default":"NULL"},{"name":"order_by","props":0,"default":"NULL"},{"name":"...","props":2}],"callees":["-","<","abort","shift","check_number_whole","check_dots_empty0"],"file":"R/lead-lag.R","line":74,"sourceUrl":"https://github.com/cran/dplyr/blob/1.2.1/R/lead-lag.R#L74","docUrl":"https://rdrr.io/cran/dplyr/man/lead-lag.html","manUrl":"https://github.com/cran/dplyr/blob/1.2.1/man/lead-lag.Rd"}},".meta":{}}

The parameters and requiredParameters properties additionally filter by the shape of a function, which is useful to find functions you only half-remember: { package: '*', parameters: ['data', 'mapping'] } finds every known function taking both of these.