Made generateConfig public and switched order of merge

[CEbbinghaus]

My config requires plugins ordered in a particular order which makes using the preset as it is right now impossible.

import plugin from "./plugin.json" with { type: "json" };

export default defineConfig(merge(
	deckyPlugin(),
	{
		plugins: [
			nodeResolve({ browser: true }),
			codegen.default(),
			mdx({ providerImportSource: '@mdx-js/react' }),
			commonjs(),
			json(),
			typescript(),
			externalGlobals({
				react: 'SP_REACT',
				'react-dom': 'SP_REACTDOM',
				'@decky/ui': 'DFL',
				'@decky/manifest': JSON.stringify(plugin)
			}),
			replace({
				preventAssignment: false,
				'process.env.NODE_ENV': JSON.stringify('production'),
			}),
			importAssets({
				publicPath: `http://127.0.0.1:1337/plugins/${plugin.name}/`
			})
		],
	}
));

To help with this I propose 2 changes

• export the generateConfig method so the file reading can be skipped if the config is already known:

import plugin from "./plugin.json" with { type: "json" };

export default defineConfig(merge(
	generateConfig(plugin),
	...
	)
)

• Switch around the order the arguments are provided to mergeAndConcat which means that the provided arguments actually override the base argument.

// Should override input with "test.ts" rather than the default
deckyPlugin({input: "test.ts"});

[CEbbinghaus]

I didn't add it yet but I would also like an option to provide the config as an object rather than having the deckyPlugin method read the file itself.

-export default function deckyPlugin(options = {}, sourceRoot = ".") {
-    const manifest = JSON.parse(readFileSync(join(sourceRoot, "plugin.json"), "utf-8"));
+export default function deckyPlugin(options = {}, plugin = undefined) {
+    const manifest = plugin || JSON.parse(readFileSync(join(sourceRoot, "plugin.json"), "utf-8"));
    const defaultOptions = generateConfig(manifest);

[CEbbinghaus]

Ideally we would also change the mergeAndConcat to just merge so I can skip having to do the merge myself. I need to purely overwrite the plugin order not merely add to it. If that were done I could switch to using this package as intended although with the downside that it still reads the file itself.