First pass at esbuild bundling (wip)

esbuild.js

@@ -0,0 +1,73 @@
+const esbuild = require('esbuild');
+const path = require('path');
+
+const args = process.argv.slice(2);
+
+let index = args.indexOf('--mode');
+const mode = (index >= 0 ? args[index + 1] : undefined) || 'none';
+
+index = args.indexOf('--target');
+const target = (index >= 0 ? args[index + 1] : undefined) || 'node';
+
+const watch = args.includes('--watch');
+const check = !args.includes('--no-check');
+
+let plugins = [];
+
+let TypeCheckerPlugin;
+if (check) {
+	({ EsbuildPlugin: TypeCheckerPlugin } = require('vite-esbuild-typescript-checker'));
+	plugins.push(
+		TypeCheckerPlugin({
+			checker: {
+				async: false,
+				eslint: {
+					enabled: true,
+					files: 'src/**/*.ts',
+					options: {
+						// cache: true,
+						cacheLocation: path.join(
+							__dirname,
+							target === 'webworker' ? '.eslintcache.browser' : '.eslintcache',
+						),
+						overrideConfigFile: path.join(
+							__dirname,
+							target === 'webworker' ? '.eslintrc.browser.json' : '.eslintrc.json',
+						),
+					},
+				},
+				formatter: 'basic',
+				typescript: {
+					configFile: target === 'webworker' ? 'tsconfig.browser.json' : 'tsconfig.json',
+				},
+			},
+		}),
+	);
+}
+
+esbuild
+	.build({
+		bundle: true,
+		entryPoints: ['src/extension.ts'],
+		entryNames: '[dir]/gitlens',
+		external:
+			target === 'webworker'
+				? ['vscode', 'child_process', 'crypto', 'fs', 'stream', 'os', 'src/env/node/*']
+				: ['vscode', 'src/env/browser/*'],
+		format: 'cjs',
+		keepNames: true,
+		logLevel: 'info',
+		mainFields: target === 'webworker' ? ['browser', 'module', 'main'] : ['module', 'main'],
+		minify: mode === 'production' ? true : false,
+		outdir: target === 'webworker' ? 'dist/browser' : 'dist',
+		// outfile: 'dist/gitlens.js',
+		platform: target === 'webworker' ? 'browser' : target,
+		sourcemap: true,
+		// splitting: true,
+		target: ['es2020', 'chrome91', 'node14.16'],
+		treeShaking: true,
+		tsconfig: target === 'webworker' ? 'tsconfig.browser.json' : 'tsconfig.json',
+		watch: watch,
+		plugins: plugins,
+	})
+	.catch(() => process.exit(1));