0.6.5 changelog (#1406)

* draft changelog

* Update CHANGELOG.md

Co-authored-by: Mike Bostock <[email protected]>

* edits

* update dependencies

* edits

* edits

* Update CHANGELOG

* Update CHANGELOG

* Update CHANGELOG

* Update CHANGELOG

---------

Co-authored-by: Mike Bostock <[email protected]>

CHANGELOG.md

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 # Observable Plot - Changelog
 
+## 0.6.5
+
+[Released April 1, 2023.](https://github.com/observablehq/plot/releases/tag/v0.6.5)
+
+**TypeScript!** The feature you asked for most is here. 🎉 Plot now exports TypeScript type declarations (.d.ts) with precise types and documentation for all of Plot’s public API. This allows code editors such as VS Code to offer better suggestions, complete with inline documentation. For example, if you type “Plot.g”, Plot.geo is now suggested:
+
+<img src="./img/ts-property.png" width="840" alt="A screenshot of VS Code, showing suggested completions for Plot.g, including geo, geoCentroid, graticule, and other methods. A details panel showing documentation for Plot.geo, the top suggestion, is also shown.">
+
+Function calls also have hints, showing their expected arguments.
+
+<img src="./img/ts-function.png" width="840" alt="A screenshot of VS Code, showing documentation for calling Plot.geo, including the data and options arguments.">
+
+Types are especially useful for suggesting well-known names, such as projections, scale types, and color schemes.
+
+<img src="./img/ts-enum.png" width="840" alt="A screenshot of VS Code, showing suggested completions for the color scale scheme option. An open menu lists color schemes, including Accent, Blues, BrBG, BuGn, and more.">
+
+TypeScript also helps for reading code; hover any symbol and immediately see the relevant documentation.
+
+<img src="./img/ts-hover.png" width="840" alt="A screenshot of VS Code, with the mouse hovering the color scale’s unknown option. A panel shows documentation explaining the option.">
+
+Lastly, if you’re using Plot in a TypeScript project, you can now benefit from additional static type checking to find errors.
+
+<img src="./img/ts-error.png" width="840" alt="A screenshot of VS Code, showing an red squiggly underline under a typo in the code, which accidentally calls mark.plots. A panel suggests calling mark.plot instead.">
+
+If you have suggestions or clarifications on how to improve the documentation, please open an issue or discussion, or send us a pull request.
+
+The **strokeOpacity**, **fillOpacity**, and **opacity** channels now opt-out of the *opacity* scale by default when all values are numbers in the range [0, 1]; to opt-in to the *opacity* scale, specify the channel as {value, scale: true}. The raster mark now also supports scale overrides.
+
+The scale **nice** option now accepts named time intervals such as *day* and *week*. The new *quarter* and *half* time intervals represent quarters (three months) and half-years (six months). The quantile scale now supports the **unknown** option. BigInt channels are now supported; values are coerced to numbers. Color legends now support the **opacity** option.
+
+The text mark no longer crashes when a NaN tick value is specified for an axis. The **className** option now allows mixed-case class names. Channel-derived scale domains now correctly handle non-orderable values, duplicate values, and mark transforms. Plot.auto now renders correctly when a non-zero **reduce** is used in conjunction with the *bar* **mark**, and in some cases when the **zero** option is specified. The **zero** option no longer changes the default mark type, and Plot.autoSpec now materializes the **zero** option.
+
+The interfaces for reduce and map implementations have changed. To better disambiguate from arrays, reduce implementations now have a *reduceIndex* method instead of a *reduce* method, and map implementations now have a *mapIndex* method instead of a *map* method. The old interfaces are still supported, but now deprecated.
+
 ## 0.6.4
 
 [Released February 28, 2023.](https://github.com/observablehq/plot/releases/tag/v0.6.4)