Fix watching relative dirs in @swc/cli due to change in chokidar@v4 (#82)

When watching on `--out-dir`, `@swc/cli` would compile the sources when
a relative path was passed, but watching would immediately exit instead
of watch for changes.

Chokidar version 4.x [removes globbing
support](https://github.com/paulmillr/chokidar/releases/tag/4.0.0),
which means that it does not recursively watch unresolved relative paths
with either globbing or cwd. The documentation recommends resolving the
glob(s) before passing to `watch`, and has some examples.

Weighing the options, it appeared to be more ergonomic to use
`globSources` to resolve the files to watch rather than create a new
method of globbing or directly glob the files. This pull request makes a
very small change to the parameters of `watchSources`, as I could not
cause the error to occur on individual files and wanted to leave that
signature alone. However, when watching on `--out-dir`, watching would
immediately exit as a relative file did not exist and was not being
resolved via globbing anymore.

This restores the ability to pass relative paths and globs to the `swc`
command of `@swc/cli` and successfully watch for changes of the source
files.

Author: aaronhuggins

.changeset/twelve-fishes-roll.md

@@ -0,0 +1,5 @@
+---
+"@swc/cli": patch
+---
+
+Fix watching relative dirs in `@swc/cli` due to change in `chokidar@v4`

packages/cli/src/swc/dir.ts

@@ -256,9 +256,16 @@ async function watchCompilation(
         outFileExtension,
         quiet,
         sync,
+        only,
+        ignore,
     } = cliOptions;
 
-    const watcher = await watchSources(filenames, includeDotfiles);
+    const watcher = await watchSources(
+        filenames,
+        includeDotfiles,
+        only,
+        ignore
+    );
     watcher.on("ready", () => {
         if (callbacks?.onWatchReady) {
             callbacks.onWatchReady();

packages/cli/src/swc/sources.ts

@@ -106,10 +106,20 @@ export async function requireChokidar() {
     }
 }
 
-export async function watchSources(sources: string[], includeDotfiles = false) {
+export async function watchSources(
+    sources: string[],
+    includeDotfiles = false,
+    only: string[] = [],
+    ignore: string[] = [],
+) {
     const chokidar = await requireChokidar();
-
-    return chokidar.watch(sources, {
+    const sourceFiles = await globSources(
+        filenames,
+        only,
+        ignore,
+        includeDotfiles
+    );
+    return chokidar.watch(sourceFiles, {
         ignored: includeDotfiles
             ? undefined
             : (filename: string) => basename(filename).startsWith("."),