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Generate externals documentation

extern.json records the Lua-visible externs declared in TypeScript.

Regenerate

From the engine repository:

npm run cli -- build --include externs

This writes:

src/engine/declarations/extern.json
target/gamedata/extern.json

Check

npm run cli -- verify externs

The check compares the tracked JSON with current declarations and does not write files.

For optional HTML or XML references, use Extern exports.