Exporting several tiddlers to a JSON file using --rendertiddler - looking for more documentation

[Cade Roux]

I'm looking for any more examples or exposition of the --render, --rendertiddler, and --rendertiddlers commands.

What I am doing is exporting a set of tiddlers from a tiddlywiki into a single JSON file to be processed by a program/script.

This is my current command in PowerShell with appropriate escaping and it works fine:

& tiddlywiki --% TestsVerified --verbose --rendertiddler "$:/core/templates/exporters/JsonFile" TestsVerified.json text/plain "" exportFilter "[regexp:title[^(XmlOutput|TestVerified):.*]]"

But I don't understand which parameter that "" is supposed to be a placeholder for:

--rendertiddler <title> <filename> [<type>] [<template>] [<name>] [<value>]

is what the documentation has with the example:

--rendertiddler "$:/core/templates/exporters/JsonFile" output.json text/plain "" exportFilter "[tag[done]]"

and the documentation also says that --render can replace the other two commands, but I'm not sure what would be equivalent.

Any pointers to more docs on this would be appreciated.