--noClean option for watch (#282)

Author: ArnaudBarre

README.md

@@ -388,14 +388,16 @@ Options
   --format              Specify module format(s)  (default cjs,esm)
   --tsconfig            Specify your custom tsconfig path (default <root-folder>/tsconfig.json)
   --verbose             Keep outdated console output in watch mode instead of clearing the screen
+  --noClean             Don't clean the dist folder
   -h, --help            Displays this message
 
 Examples
   $ tsdx watch --entry src/foo.tsx
   $ tsdx watch --target node
   $ tsdx watch --name Foo
   $ tsdx watch --format cjs,esm,umd
-  $ tsdx build --tsconfig ./tsconfig.foo.json
+  $ tsdx watch --tsconfig ./tsconfig.foo.json
+  $ tsdx watch --noClean
 ```
 
 ### `tsdx build`
@@ -478,4 +480,4 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
-This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!

src/index.ts

@@ -354,14 +354,18 @@ prog
     'Keep outdated console output in watch mode instead of clearing the screen'
   )
   .example('watch --verbose')
+  .option('--noClean', "Don't clean the dist folder")
+  .example('watch --noClean')
   .option('--tsconfig', 'Specify custom tsconfig path')
   .example('watch --tsconfig ./tsconfig.foo.json')
   .option('--extractErrors', 'Extract invariant errors to ./errors/codes.json.')
   .example('build --extractErrors')
   .action(async (dirtyOpts: any) => {
     const opts = await normalizeOpts(dirtyOpts);
     const buildConfigs = createBuildConfigs(opts);
-    await cleanDistFolder();
+    if (!opts.noClean) {
+      await cleanDistFolder();
+    }
     await ensureDistFolder();
     if (opts.format.includes('cjs')) {
       await writeCjsEntryFile(opts.name);