promises: Abstractions for Promise-Based Asynchronous Programming

Provides fundamental abstractions for doing asynchronous programming in R using promises. Asynchronous programming is useful for allowing a single R process to orchestrate multiple tasks in the background while also attending to something else. Semantics are similar to 'JavaScript' promises, but with a syntax that is idiomatic R.

Version:	1.4.0
Depends:	R (≥ 4.1.0)
Imports:	fastmap (≥ 1.1.0), later, lifecycle, magrittr (≥ 1.5), otel (≥ 0.2.0), R6, rlang
Suggests:	future (≥ 1.21.0), knitr, mirai, otelsdk (≥ 0.2.0), purrr, Rcpp, rmarkdown, spelling, testthat (≥ 3.0.0), vembedr
Published:	2025-10-22
DOI:	10.32614/CRAN.package.promises
Author:	Joe Cheng [aut], Barret Schloerke [aut, cre], Winston Chang [aut], Charlie Gao [aut], Posit Software, PBC [cph, fnd]
Maintainer:	Barret Schloerke <barret at posit.co>
BugReports:	https://github.com/rstudio/promises/issues
License:	MIT + file LICENSE
URL:	https://rstudio.github.io/promises/, https://github.com/rstudio/promises
NeedsCompilation:	no
Language:	en-US
Materials:	README, NEWS
CRAN checks:	promises results

Documentation:

Reference manual:	promises.html , promises.pdf
Vignettes:	Why use promises? (source) An informal introduction to async programming (source) Working with promises in R (source) Launching tasks with mirai (source, R code) Launching tasks with future (source, R code) Advanced future and promises usage (source, R code) Using promises with Shiny (source, R code) Combining promises (source) Case study: converting a Shiny app to async (source)

Downloads:

Package source:	promises_1.4.0.tar.gz
Windows binaries:	r-devel: promises_1.4.0.zip, r-release: promises_1.4.0.zip, r-oldrel: promises_1.4.0.zip
macOS binaries:	r-release (arm64): promises_1.4.0.tgz, r-oldrel (arm64): promises_1.4.0.tgz, r-release (x86_64): promises_1.4.0.tgz, r-oldrel (x86_64): promises_1.4.0.tgz
Old sources:	promises archive

Reverse dependencies:

Reverse imports:	Certara.RsNLME.ModelExecutor, chromote, crew, DT, ellmer, FastRet, fiery, gwavr, httpuv, jobqueue, lavaangui, learnr, mcptools, netShiny, PacketLLM, plotly, plumber, plumber2, plumbertableau, Prostar, ravepipeline, reqres, routr, shiny, shinychat, shinydashboard, shinyTree, tall, tapLock, TKCat, TreeSearch, webdeveloper, webshot2
Reverse suggests:	aifeducation, ambiorix, chatLLM, condformat, coro, dipsaus, googlePubsubR, GSVA, httr2, ipc, MVN, notionapi, pagedown, telegram.bot
Reverse enhances:	mirai, nanonext

Linking:

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