Revert "[feat] Suggest props destructuring if possible (#6069)"

This reverts commit b1dafb8.

Author: Rich-Harris

.changeset/ninety-snakes-melt.md

@@ -148,12 +148,7 @@ export async function migrate() {
 
 			renamed += svelte_ext;
 
-			const { module, main, ext } = migrate_scripts(
-				content,
-				bare,
-				is_error_page,
-				move_to_directory
-			);
+			const { module, main, ext } = migrate_scripts(content, is_error_page, move_to_directory);
 
 			if (move_to_directory) {
 				const dir = path.dirname(renamed);

packages/migrate/migrations/routes/index.js

@@ -9,21 +9,16 @@ import {
 	except_str
 } from '../utils.js';
 import * as TASKS from '../tasks.js';
-import MagicString from 'magic-string';
 
 /**
  * @param {string} content
- * @param {string} filename
  * @param {boolean} is_error
  * @param {boolean} moved
  */
-export function migrate_scripts(content, filename, is_error, moved) {
+export function migrate_scripts(content, is_error, moved) {
 	/** @type {string | null} */
 	let module = null;
 
-	const match = /__layout(?:-([^.@]+))?/.exec(filename);
-	const data_name = match?.[1] ? `LayoutData.${match[1]}` : match ? `LayoutData` : 'PageData';
-
 	let ext = '.js';
 
 	// instance script
@@ -36,10 +31,6 @@ export function migrate_scripts(content, filename, is_error, moved) {
 				contents = adjust_imports(contents);
 			}
 
-			if (/lang(?:uage)?=(['"])(ts|typescript)\1/.test(attrs)) {
-				ext = '.ts';
-			}
-
 			if (/context=(['"])module\1/.test(attrs)) {
 				// special case — load is no longer supported in error
 				if (is_error) {
@@ -51,6 +42,10 @@ export function migrate_scripts(content, filename, is_error, moved) {
 					return `<script${attrs}>${body}</script>${whitespace}`;
 				}
 
+				if (/lang(?:uage)?=(['"])(ts|typescript)\1/.test(attrs)) {
+					ext = '.ts';
+				}
+
 				module = dedent(contents.replace(/^\n/, ''));
 
 				const declared = find_declarations(contents);
@@ -93,22 +88,8 @@ export function migrate_scripts(content, filename, is_error, moved) {
 			}
 
 			if (!is_error && /export/.test(contents)) {
-				let prefix = `\n${indent}${error('Add data prop', TASKS.PAGE_DATA_PROP)}`;
-				const props = get_props(contents);
-				if (props) {
-					prefix += `\n${comment(
-						`${indent}Suggestion (check code before using, and possibly convert to data.X access later):\n` +
-							`${indent}${
-								ext === '.ts'
-									? `import type { ${data_name} } from './$types';`
-									: `/** @type {import('./$types').${data_name}} */`
-							}\n` +
-							`${indent}export let data${ext === '.ts' ? `: ${data_name}` : ''};\n` +
-							`${indent}$: ({ ${props.join(', ')} } = data);`,
-						indent
-					)}`;
-				}
-				contents = `${prefix}\n${contents}`;
+				contents = `\n${indent}${error('Add data prop', TASKS.PAGE_DATA_PROP)}\n${contents}`;
+				// Possible TODO: migrate props to data.prop, or suggest $: ({propX, propY, ...} = data);
 			}
 
 			return `<script${attrs}>${contents}</script>${whitespace}`;
@@ -174,74 +155,3 @@ function find_declarations(content) {
 
 	return declared;
 }
-
-/**
- * @param {string} content
- */
-function get_props(content) {
-	try {
-		const ast = ts.createSourceFile(
-			'filename.ts',
-			content,
-			ts.ScriptTarget.Latest,
-			true,
-			ts.ScriptKind.TS
-		);
-
-		const code = new MagicString(content);
-		let give_up = false;
-		/** @type {string[] } */
-		let exports = [];
-
-		/** @param {ts.Node} node */
-		function walk(node) {
-			if (
-				ts.isExportDeclaration(node) ||
-				((ts.isFunctionDeclaration(node) || ts.isClassDeclaration(node)) && hasExportKeyword(node))
-			) {
-				give_up = true;
-				return;
-			}
-
-			if (ts.isVariableStatement(node)) {
-				if (hasExportKeyword(node)) {
-					const isLet = node.declarationList.flags === ts.NodeFlags.Let;
-					if (isLet) {
-						ts.forEachChild(node.declarationList, (node) => {
-							if (ts.isVariableDeclaration(node)) {
-								if (ts.isIdentifier(node.name)) {
-									const name = node.name.getText();
-									if (name === 'data') {
-										give_up = true;
-										return;
-									} else {
-										exports.push(name);
-									}
-								} else {
-									give_up = true;
-									return;
-								}
-							}
-						});
-					} else {
-						give_up = true;
-						return;
-					}
-				}
-			}
-		}
-
-		ts.forEachChild(ast, walk);
-		if (give_up) return;
-		return exports;
-	} catch (e) {
-		return;
-	}
-}
-
-/**
- * @param {ts.Node} node
- */
-export function hasExportKeyword(node) {
-	return node.modifiers?.find((x) => x.kind == ts.SyntaxKind.ExportKeyword);
-}

packages/migrate/migrations/routes/migrate_scripts/index.js

@@ -7,7 +7,6 @@ for (const sample of read_samples(import.meta.url)) {
 	test(sample.description, () => {
 		const actual = migrate_scripts(
 			sample.before,
-			sample.filename ?? 'some-page.svelte',
 			sample.description.includes('error'),
 			sample.description.includes('moved')
 		);

packages/migrate/migrations/routes/migrate_scripts/index.spec.js

@@ -77,19 +77,13 @@
 ```svelte after
 <script>
 	throw new Error("@migration task: Add data prop (https://github.com/sveltejs/kit/discussions/5774#discussioncomment-3292707)");
-	// Suggestion (check code before using, and possibly convert to data.X access later):
-	// /** @type {import('./$types').PageData} */
-	// export let data;
-	// $: ({ a } = data);
 
 	export let a;
 </script>
 ```
 
 ## Module context with moved imports
 
-> file: __layout.svelte
-
 ```svelte before
 <script context="module">
 	import Foo from './Foo.svelte';
@@ -102,7 +96,7 @@
 	}
 </script>
 
-<script lang="ts">
+<script>
 	export let sry;
 </script>
 
@@ -123,12 +117,8 @@
 	// }
 </script>
 
-<script lang="ts">
+<script>
 	throw new Error("@migration task: Add data prop (https://github.com/sveltejs/kit/discussions/5774#discussioncomment-3292707)");
-	// Suggestion (check code before using, and possibly convert to data.X access later):
-	// import type { LayoutData } from './$types';
-	// export let data: LayoutData;
-	// $: ({ sry } = data);
 
 	export let sry;
 </script>