Combine esbuild scripts (#184531)

* Combine esbuild scripts

This combines the various build scripts used for building webview/notebook content. This should make it easier to update settings for them

As part of this, I also fixed the script so that on watch it restarts automatically on syntax errors instead of exiting

* Migrate other build script

* Fixing math build script

extensions/esbuild-webview-common.js

@@ -0,0 +1,91 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+// @ts-check
+
+/**
+ * @fileoverview Common build script for extension scripts used in in webviews.
+ */
+
+const path = require('path');
+const esbuild = require('esbuild');
+
+/**
+ * @typedef {Partial<import('esbuild').BuildOptions> & {
+ * 	entryPoints: string[] | Record<string, string> | { in: string, out: string }[];
+ * 	outdir: string;
+ * }} BuildOptions
+ */
+
+/**
+ * Build the source code once using esbuild.
+ *
+ * @param {BuildOptions} options
+ * @param {(outDir: string) => unknown} [didBuild]
+ */
+async function build(options, didBuild) {
+	await esbuild.build({
+		bundle: true,
+		minify: true,
+		sourcemap: false,
+		format: 'esm',
+		platform: 'browser',
+		target: ['es2020'],
+		...options,
+	});
+
+	await didBuild?.(options.outdir);
+}
+
+/**
+ * Build the source code once using esbuild, logging errors instead of throwing.
+ *
+ * @param {BuildOptions} options
+ * @param {(outDir: string) => unknown} [didBuild]
+ */
+async function tryBuild(options, didBuild) {
+	try {
+		await build(options, didBuild);
+	} catch (err) {
+		console.error(err);
+	}
+}
+
+/**
+ * @param {{
+ * 	srcDir: string;
+ *  outdir: string;
+ *  entryPoints: string[] | Record<string, string> | { in: string, out: string }[];
+ * 	additionalOptions?: Partial<import('esbuild').BuildOptions>
+ * }} config
+ * @param {string[]} args
+ * @param {(outDir: string) => unknown} [didBuild]
+ */
+module.exports.run = function (config, args, didBuild) {
+	let outdir = config.outdir;
+
+	const outputRootIndex = args.indexOf('--outputRoot');
+	if (outputRootIndex >= 0) {
+		const outputRoot = args[outputRootIndex + 1];
+		const outputDirName = path.basename(outdir);
+		outdir = path.join(outputRoot, outputDirName);
+	}
+
+	/** @type {BuildOptions} */
+	const resolvedOptions = {
+		entryPoints: config.entryPoints,
+		outdir,
+		...(config.additionalOptions || {}),
+	};
+
+	const isWatch = args.indexOf('--watch') >= 0;
+	if (isWatch) {
+		tryBuild(resolvedOptions);
+
+		const watcher = require('@parcel/watcher');
+		watcher.subscribe(config.srcDir, () => tryBuild(resolvedOptions, didBuild));
+	} else {
+		return build(resolvedOptions, didBuild).catch(() => process.exit(1));
+	}
+};