Add JSDoc annotations to templates

.changeset/cold-boats-wave.md

@@ -0,0 +1,5 @@
+---
+'create-svelte': patch
+---
+
+Disable type checking by default for non-typescript projects.

packages/create-svelte/bin.js

@@ -70,12 +70,15 @@ async function main() {
 					})
 				},
 				{
-					type: 'toggle',
-					name: 'typescript',
-					message: 'Use TypeScript?',
+					type: 'select',
+					name: 'types',
+					message: 'Add type checking?',
 					initial: false,
-					active: 'Yes',
-					inactive: 'No'
+					choices: [
+						{ title: 'Type-checked JavaScript', value: 'checkjs' },
+						{ title: 'TypeScript', value: 'typescript' },
+						{ title: 'None', value: null }
+					]
 				},
 				{
 					type: 'toggle',
@@ -116,9 +119,12 @@ async function main() {
 
 	console.log(bold(green('\nYour project is ready!')));
 
-	if (options.typescript) {
+	if (options.types === 'typescript') {
 		console.log(bold('✔ Typescript'));
 		console.log('  Inside Svelte components, use <script lang="ts">');
+	} else if (options.types === 'checkjs') {
+		console.log(bold('✔ Type-checked JavaScript'));
+		console.log('  https://www.typescriptlang.org/tsconfig#checkJs');
 	}
 
 	if (options.eslint) {

packages/create-svelte/index.js

@@ -11,22 +11,22 @@ import { mkdirp, copy, dist } from './utils.js';
 export async function create(cwd, options) {
 	mkdirp(cwd);
 
-	write_template_files(options.template, options.typescript, options.name, cwd);
+	write_template_files(options.template, options.types, options.name, cwd);
 	write_common_files(cwd, options, options.name);
 }
 
 /**
  * @param {string} template
- * @param {boolean} typescript
+ * @param {'typescript' | 'checkjs' | null} types
  * @param {string} name
  * @param {string} cwd
  */
-function write_template_files(template, typescript, name, cwd) {
+function write_template_files(template, types, name, cwd) {
 	const dir = dist(`templates/${template}`);
 	copy(`${dir}/assets`, cwd, (name) => name.replace('DOT-', '.'));
 	copy(`${dir}/package.json`, `${cwd}/package.json`);
 
-	const manifest = `${dir}/files.${typescript ? 'ts' : 'js'}.json`;
+	const manifest = `${dir}/files.types=${types}.json`;
 	const files = /** @type {import('./types/internal').File[]} */ (
 		JSON.parse(fs.readFileSync(manifest, 'utf-8'))
 	);
@@ -83,9 +83,13 @@ function write_common_files(cwd, options, name) {
  * @returns {boolean}
  */
 function matches_condition(condition, options) {
-	return condition === 'default' || condition === 'skeleton'
-		? options.template === condition
-		: options[condition];
+	if (condition === 'default' || condition === 'skeleton') {
+		return options.template === condition;
+	}
+	if (condition === 'typescript' || condition === 'checkjs') {
+		return options.types === condition;
+	}
+	return options[condition];
 }
 
 /**

packages/create-svelte/scripts/build-templates.js

@@ -6,9 +6,9 @@ import { transform } from 'sucrase';
 import glob from 'tiny-glob/sync.js';
 import { mkdirp, rimraf } from '../utils.js';
 
-/** @param {string} typescript */
-function convert_typescript(typescript) {
-	const transformed = transform(typescript, {
+/** @param {string} content */
+function convert_typescript(content) {
+	const transformed = transform(content, {
 		transforms: ['typescript']
 	});
 
@@ -21,6 +21,11 @@ function convert_typescript(typescript) {
 	});
 }
 
+/** @param {string} content */
+function strip_jsdoc(content) {
+	return content.replace(/\/\*\*[\s\S]+?\*\/[\s\n]+/g, '');
+}
+
 /** @param {Set<string>} shared */
 async function generate_templates(shared) {
 	const templates = fs.readdirSync('templates');
@@ -43,8 +48,12 @@ async function generate_templates(shared) {
 		const meta_file = path.join(cwd, '.meta.json');
 		if (!fs.existsSync(meta_file)) throw new Error('Template must have a .meta.json file');
 
-		/** @type {import('../types/internal.js').File[]} */
-		const ts = [];
+		/** @type {Record<string, import('../types/internal.js').File[]>} */
+		const types = {
+			typescript: [],
+			checkjs: [],
+			null: []
+		};
 
 		glob('**/*', { cwd, filesOnly: true, dot: true }).forEach((name) => {
 			// the package.template.json thing is a bit annoying — basically we want
@@ -64,88 +73,102 @@ async function generate_templates(shared) {
 			// ignore contents of .gitignore or .ignore
 			if (!gitignore.accepts(name) || !ignore.accepts(name) || name === '.ignore') return;
 
-			if (/\.(js|ts|svelte|svelte\.md)$/.test(name)) {
+			if (/\.(ts|svelte)$/.test(name)) {
 				const contents = fs.readFileSync(path.join(cwd, name), 'utf8');
-				ts.push({
-					name,
-					contents
-				});
+
+				if (name.endsWith('.d.ts')) {
+					if (name.endsWith('app.d.ts')) types.checkjs.push({ name, contents });
+					types.typescript.push({ name, contents });
+				} else if (name.endsWith('.ts')) {
+					const js = convert_typescript(contents);
+
+					types.typescript.push({
+						name,
+						contents: strip_jsdoc(contents)
+					});
+
+					types.checkjs.push({
+						name: name.replace(/\.ts$/, '.js'),
+						contents: js
+					});
+
+					types.null.push({
+						name: name.replace(/\.ts$/, '.js'),
+						contents: strip_jsdoc(js)
+					});
+				} else {
+					// we jump through some hoops, rather than just using svelte.preprocess,
+					// so that the output preserves the original formatting to the extent
+					// possible (e.g. preserving double line breaks). Sucrase is the best
+					// tool for the job because it just removes the types; Prettier then
+					// tidies up the end result
+					const js_contents = contents.replace(
+						/<script([^>]+)>([\s\S]+?)<\/script>/g,
+						(m, attrs, typescript) => {
+							// Sucrase assumes 'unused' imports (which _are_ used, but only
+							// in the markup) are type imports, and strips them. This step
+							// prevents it from drawing that conclusion
+							const imports = [];
+							const import_pattern = /import (.+?) from/g;
+							let import_match;
+							while ((import_match = import_pattern.exec(typescript))) {
+								const word_pattern = /[a-z_$][a-z0-9_$]*/gi;
+								let word_match;
+								while ((word_match = word_pattern.exec(import_match[1]))) {
+									imports.push(word_match[0]);
+								}
+							}
+
+							const suffix = `\n${imports.join(',')}`;
+
+							const transformed = transform(typescript + suffix, {
+								transforms: ['typescript']
+							}).code.slice(0, -suffix.length);
+
+							const contents = prettier
+								.format(transformed, {
+									parser: 'babel',
+									useTabs: true,
+									singleQuote: true,
+									trailingComma: 'none',
+									printWidth: 100
+								})
+								.trim()
+								.replace(/^(.)/gm, '\t$1');
+
+							return `<script${attrs.replace(' lang="ts"', '')}>\n${contents}\n</script>`;
+						}
+					);
+
+					types.typescript.push({
+						name,
+						contents: strip_jsdoc(contents)
+					});
+
+					types.checkjs.push({
+						name,
+						contents: js_contents
+					});
+
+					types.null.push({
+						name,
+						contents: strip_jsdoc(js_contents)
+					});
+				}
 			} else {
 				const dest = path.join(assets, name.replace(/^\./, 'DOT-'));
 				mkdirp(path.dirname(dest));
 				fs.copyFileSync(path.join(cwd, name), dest);
 			}
 		});
 
-		/** @type {import('../types/internal.js').File[]} */
-		const js = [];
-
-		for (const file of ts) {
-			// The app.d.ts file makes TS/JS aware of some ambient modules, which are
-			// also needed for JS projects if people turn on "checkJs" in their jsonfig
-			if (file.name.endsWith('.d.ts')) {
-				if (file.name.endsWith('app.d.ts')) js.push(file);
-			} else if (file.name.endsWith('.ts')) {
-				js.push({
-					name: file.name.replace(/\.ts$/, '.js'),
-					contents: convert_typescript(file.contents)
-				});
-			} else if (file.name.endsWith('.svelte')) {
-				// we jump through some hoops, rather than just using svelte.preprocess,
-				// so that the output preserves the original formatting to the extent
-				// possible (e.g. preserving double line breaks). Sucrase is the best
-				// tool for the job because it just removes the types; Prettier then
-				// tidies up the end result
-				const contents = file.contents.replace(
-					/<script([^>]+)>([\s\S]+?)<\/script>/g,
-					(m, attrs, typescript) => {
-						// Sucrase assumes 'unused' imports (which _are_ used, but only
-						// in the markup) are type imports, and strips them. This step
-						// prevents it from drawing that conclusion
-						const imports = [];
-						const import_pattern = /import (.+?) from/g;
-						let import_match;
-						while ((import_match = import_pattern.exec(typescript))) {
-							const word_pattern = /[a-z_$][a-z0-9_$]*/gi;
-							let word_match;
-							while ((word_match = word_pattern.exec(import_match[1]))) {
-								imports.push(word_match[0]);
-							}
-						}
-
-						const suffix = `\n${imports.join(',')}`;
-
-						const transformed = transform(typescript + suffix, {
-							transforms: ['typescript']
-						}).code.slice(0, -suffix.length);
-
-						const contents = prettier
-							.format(transformed, {
-								parser: 'babel',
-								useTabs: true,
-								singleQuote: true,
-								trailingComma: 'none',
-								printWidth: 100
-							})
-							.trim()
-							.replace(/^(.)/gm, '\t$1');
-
-						return `<script${attrs.replace(' lang="ts"', '')}>\n${contents}\n</script>`;
-					}
-				);
-
-				js.push({
-					name: file.name,
-					contents
-				});
-			} else {
-				js.push(file);
-			}
-		}
-
 		fs.copyFileSync(meta_file, `${dir}/meta.json`);
-		fs.writeFileSync(`${dir}/files.ts.json`, JSON.stringify(ts, null, '\t'));
-		fs.writeFileSync(`${dir}/files.js.json`, JSON.stringify(js, null, '\t'));
+		fs.writeFileSync(
+			`${dir}/files.types=typescript.json`,
+			JSON.stringify(types.typescript, null, '\t')
+		);
+		fs.writeFileSync(`${dir}/files.types=checkjs.json`, JSON.stringify(types.checkjs, null, '\t'));
+		fs.writeFileSync(`${dir}/files.types=null.json`, JSON.stringify(types.null, null, '\t'));
 	}
 }
 

packages/create-svelte/scripts/update-template-repo-contents.js

@@ -17,7 +17,7 @@ await create(repo, {
 	name: 'kit-template-default',
 	template: 'default',
 	eslint: false,
-	typescript: false,
+	types: 'checkjs',
 	prettier: true,
 	playwright: false
 });

packages/create-svelte/shared/+checkjs/jsconfig.json

@@ -0,0 +1,6 @@
+{
+	"extends": "./.svelte-kit/tsconfig.json",
+	"compilerOptions": {
+		"checkJs": true
+	}
+}

packages/create-svelte/shared/+checkjs/package.json

@@ -0,0 +1,10 @@
+{
+	"scripts": {
+		"check": "svelte-check --tsconfig ./jsconfig.json",
+		"check:watch": "svelte-check --tsconfig ./jsconfig.json --watch"
+	},
+	"devDependencies": {
+		"typescript": "~4.6.2",
+		"svelte-check": "^2.2.6"
+	}
+}

packages/create-svelte/shared/+default+checkjs/package.json

@@ -0,0 +1,5 @@
+{
+	"devDependencies": {
+		"@types/cookie": "^0.4.1"
+	}
+}

packages/create-svelte/shared/+default+checkjs/svelte.config.js

@@ -0,0 +1,20 @@
+import adapter from '@sveltejs/adapter-auto';
+import preprocess from 'svelte-preprocess';
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+	// Consult https://github.com/sveltejs/svelte-preprocess
+	// for more information about preprocessors
+	preprocess: preprocess(),
+
+	kit: {
+		adapter: adapter(),
+
+		// Override http methods in the Todo forms
+		methodOverride: {
+			allowed: ['PATCH', 'DELETE']
+		}
+	}
+};
+
+export default config;

packages/create-svelte/templates/default/src/hooks.ts

@@ -2,6 +2,7 @@ import cookie from 'cookie';
 import { v4 as uuid } from '@lukeed/uuid';
 import type { Handle } from '@sveltejs/kit';
 
+/** @type {import('@sveltejs/kit').Handle} */
 export const handle: Handle = async ({ event, resolve }) => {
 	const cookies = cookie.parse(event.request.headers.get('cookie') || '');
 	event.locals.userid = cookies.userid || uuid();

packages/create-svelte/templates/default/src/lib/Counter.svelte

@@ -7,6 +7,10 @@
 	$: displayed_count.set(count);
 	$: offset = modulo($displayed_count, 1);
 
+	/**
+	 * @param {number} n
+	 * @param {number} m
+	 */
 	function modulo(n: number, m: number) {
 		// handle negative numbers
 		return ((n % m) + m) % m;