create-svelte: add svelte-check for TS (#1556)

This add svelte-check along with two validate scripts to the package.json if the user selects TS. This uncovered missing type definitions for the cookie package in the default template, which are now added as well if the user selects TS.
Closes #1536

.changeset/seven-bags-sniff.md

@@ -0,0 +1,5 @@
+---
+'create-svelte': patch
+---
+
+Add svelte-check to TS templates

packages/create-svelte/bin.js

@@ -184,8 +184,8 @@ function write_common_files(cwd, options) {
 	const pkg = /** @type {any} */ (JSON.parse(fs.readFileSync(pkg_file, 'utf-8')));
 
 	files.forEach((file) => {
-		const include = file.include.every((condition) => options[condition]);
-		const exclude = file.exclude.some((condition) => options[condition]);
+		const include = file.include.every((condition) => matchesCondition(condition, options));
+		const exclude = file.exclude.some((condition) => matchesCondition(condition, options));
 
 		if (exclude || !include) return;
 
@@ -205,6 +205,17 @@ function write_common_files(cwd, options) {
 	fs.writeFileSync(pkg_file, JSON.stringify(pkg, null, '  '));
 }
 
+/**
+ * @param {import('./types/internal').Condition} condition
+ * @param {import('./types/internal').Options} options
+ * @returns {boolean}
+ */
+function matchesCondition(condition, options) {
+	return condition === 'default' || condition === 'skeleton'
+		? options.template === condition
+		: options[condition];
+}
+
 /**
  * @param {any} target
  * @param {any} source

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

@@ -0,0 +1,5 @@
+{
+	"devDependencies": {
+		"@types/cookie": "^0.4.0"
+	}
+}

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

@@ -1,7 +1,12 @@
 {
+	"scripts": {
+		"check": "svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-check --tsconfig ./tsconfig.json --watch"
+	},
 	"devDependencies": {
 		"typescript": "^4.0.0",
 		"tslib": "^2.0.0",
+		"svelte-check": "^2.0.0",
 		"svelte-preprocess": "^4.0.0"
 	}
 }

packages/create-svelte/types/internal.d.ts

@@ -10,11 +10,13 @@ export type File = {
 	contents: string;
 };
 
+export type Condition = 'eslint' | 'prettier' | 'typescript' | 'skeleton' | 'default';
+
 export type Common = {
 	files: Array<{
 		name: string;
-		include: Array<'eslint' | 'prettier' | 'typescript'>;
-		exclude: Array<'eslint' | 'prettier' | 'typescript'>;
+		include: Array<Condition>;
+		exclude: Array<Condition>;
 		contents: string;
 	}>;
 };