chore(esbuild): ensure that output dirs are empty before we run esbui…

…ld (#5219)

This adds a call to the fs-extra `emptyDir` before we run the whole
esbuild-based bundle and build step for the `compiler/` and `mock-doc/`
dirs to ensure that there's nothing hanging around from previous builds.

scripts/esbuild/compiler.ts

@@ -17,6 +17,9 @@ export async function buildCompiler(opts: BuildOptions) {
   const compilerFileName = 'stencil.js';
   const compilerDtsName = compilerFileName.replace('.js', '.d.ts');
 
+  // clear out rollup stuff and ensure directory exists
+  await fs.emptyDir(opts.output.compilerDir);
+
   // create public d.ts
   let dts = await fs.readFile(join(inputDir, 'public.d.ts'), 'utf8');
   dts = dts.replace('@stencil/core/internal', '../internal/index');

scripts/esbuild/mock-doc.ts

@@ -20,6 +20,9 @@ export async function buildMockDoc(opts: BuildOptions) {
   const srcDir = join(opts.srcDir, 'mock-doc');
   const outputDir = opts.output.mockDocDir;
 
+  // clear out rollup stuff and ensure directory exists
+  await fs.emptyDir(outputDir);
+
   // bundle d.ts
   await bundleMockDocDts(opts, inputDir, outputDir);