Sayid Redux

Sayid 0.4 is a revived release of the long-neglected omniscient debugger for Clojure. Rather than using breakpoints, Sayid records every function call's arguments, return values, timing, and call tree so developers can inspect execution history after the fact. The release brings new artifact coordinates (mx.cider/sayid), renamed namespaces, a reworked nREPL API that returns structured data instead of pre-rendered text, and a rebuilt Emacs UI with foldable trees, source jumping, and CIDER inspector integration. The motivation came from CIDER 2.0 work, where the author realized Sayid's approach was superior to anything he could build into the built-in tracer. Breaking changes were made deliberately since the bundled Emacs client was effectively the only consumer.

Nguồn: https://metaredux.com/posts/2026/07/01/sayid-redux.html. 8sync News chỉ tóm tắt và dẫn link; bản quyền nội dung thuộc tác giả và nguồn gốc.

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nREPL and ClojureScript: Demystifying Piggieback

A deep-dive into Piggieback, the nREPL middleware that enables ClojureScript evaluation over a standard nREPL server. The author explains how Piggieback hijacks nREPL sessions to reroute eval messages to a JavaScript runtime (Node, browser, etc.) via ClojureScript's IJavaScriptEnv protocol, without requiring any client-side changes. Key internals covered include session-based dispatch, the DelegatingReplEnv trick to prevent premature teardown, how the compiler environment is stashed for use by tools like cider-nrepl, and the two distinct code paths for REPL setup vs. steady-state evaluation. The post also covers known limitations (one Node REPL per JVM, no interrupt support, multi-form eval), contrasts Piggieback's approach with shadow-cljs, and summarizes recent 0.6.x/0.7.0 bug fixes and refactoring work done as part of the CIDER 2.0 effort.

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