New WebAssembly Language Server example

2026-06-13 07:10:26 +08:00 · 2024-04-12 16:04:06 +02:00
parent a20914e8d7
commit dd6c0f014e
18 changed files with 3933 additions and 0 deletions
--- a/wasm-language-server/.eslintignore
+++ b/wasm-language-server/.eslintignore
@ -0,0 +1,7 @@
+node_modules/**
+client/node_modules/**
+client/out/**
+client/bin/**
+cient/dist/**
+server/node_modules/**
+server/out/**
--- a/wasm-language-server/.eslintrc.js
+++ b/wasm-language-server/.eslintrc.js
@ -0,0 +1,20 @@
+/**@type {import('eslint').Linter.Config} */
+// eslint-disable-next-line no-undef
+module.exports = {
+	root: true,
+	parser: '@typescript-eslint/parser',
+	plugins: [
+		'@typescript-eslint',
+	],
+	extends: [
+		'eslint:recommended',
+		'plugin:@typescript-eslint/recommended',
+	],
+	rules: {
+		'semi': [2, "always"],
+		'@typescript-eslint/no-unused-vars': 0,
+		'@typescript-eslint/no-explicit-any': 0,
+		'@typescript-eslint/explicit-module-boundary-types': 0,
+		'@typescript-eslint/no-non-null-assertion': 0,
+	}
+};
--- a/wasm-language-server/.gitignore
+++ b/wasm-language-server/.gitignore
@ -0,0 +1,4 @@
+target
+client/node_modules
+client/dist
+client/out
--- a/wasm-language-server/.vscode/launch.json
+++ b/wasm-language-server/.vscode/launch.json
@ -0,0 +1,23 @@
+{
+	// Use IntelliSense to learn about possible attributes.
+	// Hover to view descriptions of existing attributes.
+	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"type": "extensionHost",
+			"request": "launch",
+			"name": "Run Example",
+			"runtimeExecutable": "${execPath}",
+			"args": ["--extensionDevelopmentPath=${workspaceRoot}"],
+			"outFiles": [
+				"${workspaceRoot}/client/out/**/*.js"
+			],
+			"autoAttachChildProcesses": true,
+			"preLaunchTask": {
+				"type": "npm",
+				"script": "build"
+			}
+		}
+	]
+}
--- a/wasm-language-server/README.MD
+++ b/wasm-language-server/README.MD
@ -0,0 +1,26 @@
+# WASM Language Server Example
+
+An example demonstrating how to implement a Language Server in WebAssembly and run it in VS Code.
+
+
+## Functionality
+
+A simple language server that has a dummy got definition method and response to a custom message.
+
+## Pre-requisites
+
+To run the sample the following tool chains need to be installed
+
+- [Rust](https://www.rust-lang.org/): installation instructions can be found [here](https://www.rust-lang.org/tools/install)
+
+## Running the Sample in the Desktop
+
+- Run `npm install` in this folder. This installs all necessary npm modules.
+- Open VS Code on this folder.
+- Execute the launch config `Run Example`.
+
+## Running the Sample in the Web
+
+As a pre-requisite follow the instructions [here](https://code.visualstudio.com/api/extension-guides/web-extensions#test-your-web-extension-in-vscode.dev) to generate necessary certificate to side load the extension into vscode.dev or insiders.vscode.dev.
+
+Then compile the extension for the Web by running `npm run esbuild`, start a local extension server using `npm run serve`, open vscode.dev or insiders.vscode.dev in a browser and execute the command `Install Extension from Location`. As a location use `https://localhost:5000`.
--- a/wasm-language-server/client/bin/esbuild.js
+++ b/wasm-language-server/client/bin/esbuild.js
@ -0,0 +1,71 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+//@ts-check
+const esbuild = require('esbuild');
+
+/**
+ * @typedef {import('esbuild').BuildOptions} BuildOptions
+ */
+
+/** @type BuildOptions */
+const sharedWebOptions = {
+	bundle: true,
+	external: ['vscode'],
+	target: 'es2020',
+	platform: 'browser',
+	sourcemap: true,
+};
+
+/** @type BuildOptions */
+const webOptions = {
+	entryPoints: ['src/extension.ts'],
+	outfile: 'dist/web/extension.js',
+	format: 'cjs',
+	...sharedWebOptions,
+};
+
+/** @type BuildOptions */
+const sharedDesktopOptions = {
+	bundle: true,
+	external: ['vscode'],
+	target: 'es2020',
+	platform: 'node',
+	sourcemap: true,
+};
+
+/** @type BuildOptions */
+const desktopOptions = {
+	entryPoints: ['src/extension.ts'],
+	outfile: 'dist/desktop/extension.js',
+	format: 'cjs',
+	...sharedDesktopOptions,
+};
+
+function createContexts() {
+	return Promise.all([
+		esbuild.context(webOptions),
+		esbuild.context(desktopOptions),
+	]);
+}
+
+createContexts().then(contexts => {
+	if (process.argv[2] === '--watch') {
+		const promises = [];
+		for (const context of contexts) {
+			promises.push(context.watch());
+		}
+		return Promise.all(promises).then(() => { return undefined; });
+	} else {
+		const promises = [];
+		for (const context of contexts) {
+			promises.push(context.rebuild());
+		}
+		Promise.all(promises).then(async () => {
+			for (const context of contexts) {
+				await context.dispose();
+			}
+		}).then(() => { return undefined; }).catch(console.error);
+	}
+}).catch(console.error);
--- a/wasm-language-server/client/package-lock.json
+++ b/wasm-language-server/client/package-lock.json
@ -0,0 +1,352 @@
+{
+	"name": "client",
+	"version": "1.0.0",
+	"lockfileVersion": 3,
+	"requires": true,
+	"packages": {
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+		"node_modules/y18n": {
+			"version": "5.0.8",
+			"resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+			"integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+			"peer": true,
+			"engines": {
+				"node": ">=10"
+			}
+		},
+		"node_modules/yallist": {
+			"version": "4.0.0",
+			"resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+			"integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+			"peer": true
+		},
+		"node_modules/yargs": {
+			"version": "17.7.2",
+			"resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
+			"integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+			"peer": true,
+			"dependencies": {
+				"cliui": "^8.0.1",
+				"escalade": "^3.1.1",
+				"get-caller-file": "^2.0.5",
+				"require-directory": "^2.1.1",
+				"string-width": "^4.2.3",
+				"y18n": "^5.0.5",
+				"yargs-parser": "^21.1.1"
+			},
+			"engines": {
+				"node": ">=12"
+			}
+		},
+		"node_modules/yargs-parser": {
+			"version": "21.1.1",
+			"resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+			"integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+			"peer": true,
+			"engines": {
+				"node": ">=12"
+			}
+		}
+	}
+}
--- a/wasm-language-server/client/package.json
+++ b/wasm-language-server/client/package.json
@ -0,0 +1,37 @@
+{
+	"name": "client",
+	"description": "The language client",
+	"author": "Microsoft Corporation",
+	"license": "MIT",
+	"version": "1.0.0",
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/Microsoft/vscode-extension-samples"
+	},
+	"publisher": "vscode-samples",
+	"categories": [],
+	"keywords": [
+		"WASM",
+		"Component Model",
+		"LSP",
+		"Language Server"
+	],
+	"engines": {
+		"vscode": "^1.88.0"
+	},
+	"main": "./out/extension",
+	"browser": "./dist/web/extension",
+	"dependencies": {
+		"@vscode/wasm-wasi-lsp": "0.1.0-pre.1"
+	},
+	"devDependencies": {
+		"@types/vscode": "1.88.0",
+		"@types/node": "^18.14.6"
+	},
+	"scripts": {
+		"compile": "tsc -b",
+		"watch": "tsc -b -w",
+		"lint": "eslint ./src --ext .ts,.tsx",
+		"esbuild": "node ./bin/esbuild"
+	}
+}
--- a/wasm-language-server/client/src/extension.ts
+++ b/wasm-language-server/client/src/extension.ts
@ -0,0 +1,53 @@
+/* --------------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ * ------------------------------------------------------------------------------------------ */
+
+import { ExtensionContext, Uri, window, workspace } from 'vscode';
+import { LanguageClient, LanguageClientOptions, ServerOptions } from 'vscode-languageclient/node';
+import { Wasm, ProcessOptions } from '@vscode/wasm-wasi';
+import { createStdioOptions, startServer } from '@vscode/wasm-wasi-lsp';
+
+let client: LanguageClient;
+const channel = window.createOutputChannel('LSP WASM Server');
+
+export async function activate(context: ExtensionContext) {
+	const wasm: Wasm = await Wasm.load();
+
+	const serverOptions: ServerOptions = async () => {
+		const options: ProcessOptions = {
+			stdio: createStdioOptions(),
+			mountPoints: [
+				{ kind: 'workspaceFolder' },
+			]
+		};
+		const filename = Uri.joinPath(context.extensionUri, 'server', 'target', 'wasm32-wasi-preview1-threads', 'release', 'server.wasm');
+		const bits = await workspace.fs.readFile(filename);
+		const module = await WebAssembly.compile(bits);
+		const process = await wasm.createProcess('lsp-server', module, { initial: 160, maximum: 160, shared: true }, options);
+
+		const decoder = new TextDecoder('utf-8');
+		process.stderr!.onData((data) => {
+			channel.append(decoder.decode(data));
+		});
+
+		return startServer(process);
+	};
+
+	const clientOptions: LanguageClientOptions = {
+		documentSelector: [ { language: 'bat' } ],
+		outputChannel: channel,
+		diagnosticCollectionName: 'markers',
+	};
+
+	client = new LanguageClient('lspClient', 'LSP Client', serverOptions, clientOptions);
+	try {
+		await client.start();
+	} catch (error) {
+		client.error(`Start failed`, error, 'force');
+	}
+}
+
+export function deactivate() {
+	return client.stop();
+}
--- a/wasm-language-server/client/tsconfig.json
+++ b/wasm-language-server/client/tsconfig.json
@ -0,0 +1,26 @@
+{
+    "compilerOptions": {
+        "rootDir": "./src",
+        "skipLibCheck": true,
+        "lib": [
+            "es2022",
+            "webworker"
+        ],
+        "types": [
+            "vscode"
+        ],
+        "module": "Node16",
+        "moduleResolution": "Node16",
+        "outDir": "./out",
+        "strict": true,
+        "noImplicitAny": true,
+        "noImplicitReturns": true,
+        "noImplicitThis": true,
+        "declaration": true,
+        "stripInternal": true,
+        "sourceMap": true,
+        "declarationMap": true,
+        "noUnusedLocals": false,
+        "noUnusedParameters": false
+    }
+}
--- a/wasm-language-server/package-lock.json
+++ b/wasm-language-server/package-lock.json
--- a/wasm-language-server/package.json
+++ b/wasm-language-server/package.json
@ -0,0 +1,47 @@
+{
+	"name": "wasm-language-server",
+	"description": "An example demonstrating how to implement a language server as a WebAssembly module.",
+	"author": "Microsoft Corporation",
+	"license": "MIT",
+	"version": "1.0.0",
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/Microsoft/vscode-extension-samples"
+	},
+	"publisher": "vscode-samples",
+	"categories": [],
+	"keywords": [
+		"WASM",
+		"Component Model",
+		"LSP",
+		"Language Server"
+	],
+	"engines": {
+		"vscode": "^1.88.0"
+	},
+	"main": "./client/out/extension",
+	"browser": "./client/dist/web/extension",
+	"activationEvents": [
+		"onLanguage:bat"
+	],
+	"extensionDependencies": [
+		"ms-vscode.wasm-wasi-core"
+	],
+	"dependencies": {
+	},
+	"devDependencies": {
+		"@typescript-eslint/eslint-plugin": "^7.6.0",
+		"@typescript-eslint/parser": "^7.6.0",
+		"@types/node": "^18.14.6",
+		"eslint": "^8.57.0",
+		"typescript": "^5.4.5",
+		"esbuild": "^0.20.2",
+		"serve": "^14.2.1"
+	},
+	"scripts": {
+		"postinstall": "cd client && npm install && cd ..",
+		"vscode:prepublish": "npm run build",
+		"build": "cd client && npm run compile && cd ../server && npm run build && cd ..",
+		"lint": "cd client && npm run lint && cd .."
+	}
+}
--- a/wasm-language-server/server/Cargo.lock
+++ b/wasm-language-server/server/Cargo.lock
@ -0,0 +1,221 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "crossbeam-channel"
+version = "0.5.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab3db02a9c5b5121e1e42fbdb1aeb65f5e02624cc58c43f2884c6ccac0b82f95"
+dependencies = [
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "248e3bacc7dc6baa3b21e405ee045c3047101a49145e7e9eca583ab4c2ca5345"
+
+[[package]]
+name = "form_urlencoded"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13624c2627564efccf4934284bdd98cbaa14e79b0b5a141218e507b3a823456"
+dependencies = [
+ "percent-encoding",
+]
+
+[[package]]
+name = "idna"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "634d9b1461af396cad843f47fdba5597a4f9e6ddd4bfb6ff5d85028c25cb12f6"
+dependencies = [
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
+[[package]]
+name = "itoa"
+version = "1.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
+
+[[package]]
+name = "log"
+version = "0.4.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90ed8c1e510134f979dbc4f070f87d4313098b704861a105fe34231c70a3901c"
+
+[[package]]
+name = "lsp-server"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "248f65b78f6db5d8e1b1604b4098a28b43d21a8eb1deeca22b1c421b276c7095"
+dependencies = [
+ "crossbeam-channel",
+ "log",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "lsp-types"
+version = "0.95.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e34d33a8e9b006cd3fc4fe69a921affa097bae4bb65f76271f4644f9a334365"
+dependencies = [
+ "bitflags",
+ "serde",
+ "serde_json",
+ "serde_repr",
+ "url",
+]
+
+[[package]]
+name = "percent-encoding"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e835ff2298f5721608eb1a980ecaee1aef2c132bf95ecc026a11b7bf3c01c02e"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fa76aaf39101c457836aec0ce2316dbdc3ab723cdda1c6bd4e6ad4208acaca7"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "ryu"
+version = "1.0.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e86697c916019a8588c99b5fac3cead74ec0b4b819707a682fd4d23fa0ce1ba1"
+
+[[package]]
+name = "serde"
+version = "1.0.197"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fb1c873e1b9b056a4dc4c0c198b24c3ffa059243875552b2bd0933b1aee4ce2"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.197"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7eb0b34b42edc17f6b7cac84a52a1c5f0e1bb2227e997ca9011ea3dd34e8610b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.115"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12dc5c46daa8e9fdf4f5e71b6cf9a53f2487da0e86e55808e2d35539666497dd"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "serde_repr"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c64451ba24fc7a6a2d60fc75dd9c83c90903b19028d4eff35e88fc1e86564e9"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "server"
+version = "0.1.0"
+dependencies = [
+ "lsp-server",
+ "lsp-types",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.58"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44cfb93f38070beee36b3fef7d4f5a16f27751d94b187b666a5cc5e9b0d30687"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "tinyvec"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87cc5ceb3875bb20c2890005a4e226a4651264a5c75edb2421b52861a0a0cb50"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
+
+[[package]]
+name = "unicode-bidi"
+version = "0.3.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08f95100a766bf4f8f28f90d77e0a5461bbdb219042e7679bebe79004fed8d75"
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+
+[[package]]
+name = "unicode-normalization"
+version = "0.1.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a56d1686db2308d901306f92a263857ef59ea39678a5458e7cb17f01415101f5"
+dependencies = [
+ "tinyvec",
+]
+
+[[package]]
+name = "url"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "31e6302e3bb753d46e83516cae55ae196fc0c309407cf11ab35cc51a4c2a4633"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "percent-encoding",
+ "serde",
+]
--- a/wasm-language-server/server/Cargo.toml
+++ b/wasm-language-server/server/Cargo.toml
@ -0,0 +1,12 @@
+[package]
+name = "server"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+lsp-server = "0.7.6"
+lsp-types = "0.95.1"
+serde = "1.0.189"
+serde_json = "1.0.107"
--- a/wasm-language-server/server/bin/send.js
+++ b/wasm-language-server/server/bin/send.js
@ -0,0 +1,23 @@
+const ContentLength = 'Content-Length: ';
+const CRLF = '\r\n';
+
+const parts = [
+	'{"jsonrpc": "2.0", "method": "initialize", "id": 1, "params": {"capabilities": {}}}',
+	'{"jsonrpc": "2.0", "method": "initialized", "params": {}}',
+	'{"jsonrpc": "2.0", "method": "textDocument/definition", "id": 2, "params": {"textDocument": {"uri": "file://temp"}, "position": {"line": 1, "character": 1}}}'
+];
+
+process.stdin.on('data', (data) => {
+	const content = data.toString();
+	process.stderr.write(content);
+});
+
+setTimeout(() => {
+	for (let item of parts) {
+		const buffer = Buffer.from(item, 'utf8');
+		const headers = [];
+		headers.push(ContentLength + buffer.length.toString(), CRLF, CRLF);
+		process.stdout.write(headers.join(''), 'ascii');
+		process.stdout.write(buffer);
+	}
+}, 1000);
--- a/wasm-language-server/server/package.json
+++ b/wasm-language-server/server/package.json
@ -0,0 +1,12 @@
+{
+	"private": true,
+	"name": "server",
+	"displayName": "WASM Language Server",
+	"version": "0.1.0",
+	"author": "Microsoft Corporation",
+	"license": "MIT",
+	"scripts": {
+		"build": "cargo rustc --release --target wasm32-wasi-preview1-threads -- -Clink-arg=--initial-memory=10485760 -Clink-arg=--max-memory=10485760",
+		"test:wasm": "node ./bin/send.js | wasmtime --wasm-features=threads --wasi-modules=experimental-wasi-threads target/wasm32-wasi-preview1-threads/release/server.wasm"
+	}
+}
--- a/wasm-language-server/server/src/main.rs
+++ b/wasm-language-server/server/src/main.rs
@ -0,0 +1,83 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+use std::error::Error;
+
+use lsp_types::OneOf;
+use lsp_types::{
+    request::GotoDefinition, GotoDefinitionResponse, InitializeParams, ServerCapabilities,
+    Location
+};
+
+use lsp_server::{Connection, ExtractError, Message, Request, RequestId, Response};
+
+fn main() -> Result<(), Box<dyn Error + Sync + Send>> {
+    // Note that  we must have our logging only write out to stderr.
+    eprintln!("Starting WASM based LSP server");
+
+    // Create the transport. Includes the stdio (stdin and stdout) versions but this could
+    // also be implemented to use sockets or HTTP.
+    let (connection, io_threads) = Connection::stdio();
+
+    // Run the server and wait for the two threads to end (typically by trigger LSP Exit event).
+    let server_capabilities = serde_json::to_value(&ServerCapabilities {
+        definition_provider: Some(OneOf::Left(true)),
+        ..Default::default()
+    })
+    .unwrap();
+    let initialization_params = connection.initialize(server_capabilities)?;
+    main_loop(connection, initialization_params)?;
+    io_threads.join()?;
+
+    // Shut down gracefully.
+    eprintln!("Shutting down server");
+    Ok(())
+}
+
+fn main_loop(
+    connection: Connection,
+    params: serde_json::Value,
+) -> Result<(), Box<dyn Error + Sync + Send>> {
+    let _params: InitializeParams = serde_json::from_value(params).unwrap();
+    for msg in &connection.receiver {
+        match msg {
+            Message::Request(req) => {
+                if connection.handle_shutdown(&req)? {
+                    return Ok(());
+                }
+                match cast::<GotoDefinition>(req) {
+                    Ok((id, params)) => {
+                        eprintln!("Received gotoDefinition request #{id}");
+                        let loc = Location::new(params.text_document_position_params.text_document.uri, lsp_types::Range::new(lsp_types::Position::new(0, 0), lsp_types::Position::new(0, 0)));
+                        let mut vec = Vec::new();
+                        vec.push(loc);
+                        let result = Some(GotoDefinitionResponse::Array(vec));
+                        let result = serde_json::to_value(&result).unwrap();
+                        let resp = Response { id, result: Some(result), error: None };
+                        connection.sender.send(Message::Response(resp))?;
+                        continue;
+                    }
+                    Err(err @ ExtractError::JsonError { .. }) => panic!("{err:?}"),
+                    Err(ExtractError::MethodMismatch(req)) => req,
+                };
+                // ...
+            }
+            Message::Response(resp) => {
+                eprintln!("got response: {resp:?}");
+            }
+            Message::Notification(not) => {
+                eprintln!("Received notification: {not:?}");
+            }
+        }
+    }
+    Ok(())
+}
+
+fn cast<R>(req: Request) -> Result<(RequestId, R::Params), ExtractError<Request>>
+where
+    R: lsp_types::request::Request,
+    R::Params: serde::de::DeserializeOwned,
+{
+    req.extract(R::METHOD)
+}
--- a/wasm-language-server/testbed/workspace/test.bat
+++ b/wasm-language-server/testbed/workspace/test.bat
@ -0,0 +1,10 @@
+REM @ECHO OFF
+cd c:\source
+REM This is the location of the files that you want to sort
+FOR %%f IN  (*.doc *.txt) DO XCOPY c:\source\"%%f" c:\text /m /y
+REM This moves any files with a .doc or
+REM .txt extension from . c:\source to c:\textkkk
+REM %%f is a variable
+FOR %%f IN (*.jpg *.png *.bmp) DO XCOPY C:\source\"%%f" c:\images /m /y
+REM This moves any files with a .jpg, .png,
+REM or .bmp extension from c:\source to c:\images;;