fix: default cwd to process.cwd()

The jsdoc comment already mentioned that `cwd` defaults to
`process.cwd()`.

src/index.ts

@@ -31,10 +31,11 @@ export interface LocalExecConfig {
 
   /**
    * The working directory to run the command in.
-   * Defaults to process.pwd().
    * If copyBeforeRun is set to true it will copy the working directory to an asset directory and take that as the base to run.
+   *
+   * @default process.cwd()
    */
-  readonly cwd: string;
+  readonly cwd?: string;
 
   /**
    * If set to true, the working directory will be copied to an asset directory.
@@ -53,13 +54,15 @@ export class LocalExec extends Resource {
   constructor(scope: Construct, id: string, config: LocalExecConfig) {
     super(scope, id, config);
 
+    const cwd = config.cwd ?? process.cwd();
+
     const workingDir =
       config.copyBeforeRun === true
         ? new TerraformAsset(this, "workingDir", {
-            path: config.cwd,
+            path: cwd,
             type: AssetType.DIRECTORY,
           }).path
-        : config.cwd;
+        : cwd;
 
     this.cwd = workingDir;
     this.command = config.command;

test/local-exec.test.ts

@@ -158,4 +158,29 @@ describe("LocalExec", () => {
     expect(fs.existsSync(path.resolve(workingDir, "test.txt"))).toBe(true);
     expect(fs.existsSync(path.resolve(__dirname, "test.txt"))).toBe(false);
   });
+
+  describe("default cwd", () => {
+    let oldCwd = process.cwd();
+
+    beforeEach(() => {
+      oldCwd = process.cwd();
+      process.chdir(testdir);
+    });
+
+    afterEach(() => {
+      process.chdir(oldCwd);
+    });
+
+    test("defaults cwd to process.cwd()", () => {
+      // Create a file in the working directory
+      apply((stack) => {
+        new LocalExec(stack, "test", {
+          command: "cp origin.txt test.txt",
+          copyBeforeRun: false,
+        });
+      });
+
+      expect(fs.existsSync(path.resolve(testdir, "test.txt"))).toBe(true);
+    });
+  });
 });