build: fix mutli format build script

rollup.config.js

@@ -98,7 +98,7 @@ const outputConfigs = {
 const defaultFormats = ['esm-bundler', 'cjs']
 /** @type {ReadonlyArray<PackageFormat>} */
 const inlineFormats = /** @type {any} */ (
-  process.env.FORMATS && process.env.FORMATS.split(',')
+  process.env.FORMATS && process.env.FORMATS.split('+')
 )
 /** @type {ReadonlyArray<PackageFormat>} */
 const packageFormats = inlineFormats || packageOptions.formats || defaultFormats

scripts/build.js

@@ -5,14 +5,17 @@ Produces production builds and stitches together d.ts files.
 
 To specify the package to build, simply pass its name and the desired build
 formats to output (defaults to `buildOptions.formats` specified in that package,
-or "esm,cjs"):
+or ["esm-bundler", "cjs"]):
 
 ```
 # name supports fuzzy match. will build all packages with name containing "dom":
 nr build dom
 
 # specify the format to output
-nr build core --formats cjs
+nr build vue -f cjs
+
+# to specify multiple formats, separate with "+":
+nr build vue -f esm-bundler+esm-browser
 ```
 */