Many shorthands for mathematical expressions
Alphanumeric characters: :<char> → $<char>$ in markup (e.g. :X → $X$ , :5 → $5$ )
Greek letters: ;<latin> → <greek> in math and $<greek>$ in markup (e.g. ;a → alpha/ $alpha$ )
Common indices (numbers and letters i-n): <letter><index> → <letter>_<index> in math and $<letter>$<index> → $<letter>_<index>$ in markup (e.g A314 → A_314 , $alpha$n → $alpha_n$ )
Series of numbered letters: <letter> ot<optional last index> → <letter>_1, <letter>_2, ... (e.g. a ot → a_1, a_2, ... , a ot4 → a_1, a_2, a_3, a_4 , alpha ot k → alpha_1, alpha_2, ..., alpha_k )
Wrapping of any mathematical expression (see operations, works nested, multiline and in visual mode via the selection key): <expression><operation> → <operation>(<expression>) (e.g. (a^2+b^2)rt → sqrt(a^2+b^2), lambdatd → tilde(lambda), (1+1)sQ → [1+1], (1+1)sq → [(1+1)])
Matrices: <size>ma and <size>lma (e.g. 23ma → 2x3 matrix)

Note that you can enable and disable collections of snippets in the config.

Use :TypstarInsertExcalidraw to create a new drawing using the configured template, insert a figure displaying it and open it in Obsidian.
To open an inserted drawing in Obsidian, simply run :TypstarOpenExcalidraw while your cursor is on a line referencing the drawing.

Use the flA snippet to create a new flashcard

#flashcard(0, "My first flashcard")[
  Typst is awesome $a^2+b^2=c^2$
]

or the fla snippet to add a more complex front

#flashcard(0)[I love Typst $pi$][
  This is the back of my second flashcard
]

To render the flashcard in your document as well add some code like this

#let flashcard(id, front, back) = {
  strong(front)
  [\ ]
  back
}

Add a comment like // ANKI: MY::DECK to your document to set a deck used for all flashcards after this comment (You can use multiple decks per file)
Add a file named .anki containing a deck name to define a default deck on a directory base
Add a file named .anki.typ to define a preamble on a directory base. You can find the default preamble here.
Tip: Despite the use of SVGs you can still search your flashcards in Anki as the typst source is added into an invisible html paragraph

Use :TypstarAnkiScan to scan the current nvim working directory and compile all flashcards in its context, unchanged files will be ignored
Use :TypstarAnkiForce to force compilation of all flashcards in the current working directory even if the files haven't changed since the last scan (e.g. on preamble change)
Use :TypstarAnkiForceCurrent to force compilation of all flashcards in the file currently edited

Installation

Install the plugin in Neovim and set the typstarRoot config or alternatively clone typstar into ~/typstar.

require('typstar').setup({
  typstarRoot = '/path/to/typstar/repo' -- depending on your nvim plugin system
})

Install LuaSnip, set enable_autosnippets = true and set a visual mode selection key (e.g. store_selection_keys = '<Tab>') in the configuration
Install jsregexp as described here (You will see a warning on startup if jsregexp isn't installed properly)
Install nvim-treesitter and run :TSInstall typst
Optional: Setup ctheorems with names like here

Install Obsidian and create a vault in your typst note taking directory
Install the obsidian-excalidraw-plugin and enable Auto-export SVG (in plugin settings at Embedding Excalidraw into your Notes and Exporting > Export Settings > Auto-export Settings)
Have the xdg-open command working or set a different command at uriOpenCommand in the config

Typst version 0.12.0 or higher is required
Install Anki
Install Anki-Connect and make sure http://localhost is added to webCorsOriginList in the Add-on config (should be added by default)
Install the typstar python package (I recommend using pipx via pipx install git+https://github.com/arne314/typstar, you will need to have python build tools and clang installed) [Note: this may take a while]
Make sure the typstar-anki command is available in your PATH or modify the typstarAnkiCmd option in the config

Configuration

Configuration options can be intuitively derived from the table here.