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To add to @Mihael Ankerst’s reply, I also suggest using our TypeScript type definitions. They are on by default on Observable, and it should “just work” if you’re using Plot in VS Code. The x property you mention is defined here: https://github.com/observablehq/plot/blob/5e313d9a3c4bb8158bf5fa4d1286386282c1faa3/src/plot.d.ts#L151-L161 It’s a ScaleOptions object: https://github.com/observablehq/plot/blob/5e313d9a3c4bb8158bf5fa4d1286386282c1faa3/src/scales.d.ts#L344 Which extends ScaleDefaults: https://github.com/observablehq/plot/blob/5e313d9a3c4bb8158bf5fa4d1286386282c1faa3/src/scales.d.ts#L231 Hope this helps!