migrate to esbuild v0.17; only write esbuild stats if needed

see https://github.com/evanw/esbuild/blob/main/CHANGELOG.md#upgrade-guide-for-existing-code

config/esbuild.config.mjs

@@ -5,17 +5,22 @@ import parse from 'minimist';
 let args = parse(process.argv.slice(2), {boolean: true});
 delete args._;
 
-esbuild
-  .build(Object.assign({
-    bundle: true,
-    sourcemap: true,
-    entryPoints: ['./modules/id.js'],
-    legalComments: 'none',
-    logLevel: 'info',
-    metafile: true,
-    outfile: 'dist/iD.js'
-  }, args))
-  .then(result => {
-    fs.writeFileSync('./dist/esbuild.json', JSON.stringify(result.metafile, null, 2));
-  })
-  .catch(() => process.exit(1));
+const context = await esbuild.context({
+  bundle: true,
+  sourcemap: true,
+  entryPoints: ['./modules/id.js'],
+  legalComments: 'none',
+  logLevel: 'info',
+  metafile: true,
+  outfile: 'dist/iD.js'
+});
+
+if (args.watch) {
+  await context.watch();
+} else {
+  const build = await context.rebuild();
+  if (args.stats) {
+    fs.writeFileSync('./dist/esbuild.json', JSON.stringify(build.metafile, null, 2));
+  }
+  await context.dispose();
+}

package.json

@@ -16,7 +16,7 @@
     "build": "run-s build:css build:data build:js",
     "build:css": "node scripts/build_css.js",
     "build:data": "shx mkdir -p dist/data && node scripts/build_data.js",
-    "build:stats": "esbuild-visualizer --metadata dist/esbuild.json --exclude *.png --filename docs/statistics.html",
+    "build:stats": "node config/esbuild.config.mjs --stats && esbuild-visualizer --metadata dist/esbuild.json --exclude *.png --filename docs/statistics.html && shx rm dist/esbuild.json",
     "build:js": "node config/esbuild.config.mjs",
     "build:js:watch": "node config/esbuild.config.mjs --watch",
     "clean": "shx rm -f dist/esbuild.json dist/*.js dist/*.map dist/*.css dist/img/*.svg",