When a document is knitted from a file, knit_progress() also writes a JSON
record of the chunk timings so that editor extensions can show them inline.
The record goes to <root>/.quarto/timeknit/<relative path>.json, where
root is the Quarto project directory (QUARTO_PROJECT_DIR, which Quarto
sets even for single-file renders) or, outside Quarto, the document's own
directory. Quarto projects already ignore .quarto/ in git.
Details
The record is a JSON object with file (absolute document path), root,
relative, time (UTC), status ("complete" or "error"), failed
(the label of the chunk that errored, or null), total (seconds), and
chunks, an array with one object per executed chunk holding label,
start and end (1-based source lines of the chunk fences), elapsed
(seconds), and code (the chunk body without leading #| option lines).
Child documents are not recorded separately; their time is part of the
parent chunk.
Control it with the timeknit.record option: TRUE (the default) writes to
the location above, FALSE disables recording, and a directory path writes
<relative path>.json below that directory instead.