chore: default options.filename to "(unknown)"

.changeset/mighty-poets-fix.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+chore: default options.filename to "(unknown)"

packages/svelte/src/compiler/index.js

@@ -106,7 +106,7 @@ export function compileModule(source, options) {
  */
 export function parse(source, { filename, rootDir, modern } = {}) {
 	state.reset_warning_filter(() => false);
-	state.reset(source, { filename, rootDir }); // TODO it's weird to require filename/rootDir here. reconsider the API
+	state.reset(source, { filename: filename ?? '(unknown)', rootDir });
 
 	const ast = _parse(source);
 	return to_public_ast(source, ast, modern);

packages/svelte/src/compiler/phases/2-analyze/index.js

@@ -243,7 +243,7 @@ export function analyze_module(ast, options) {
 
 	return {
 		module: { ast, scope, scopes },
-		name: options.filename || 'module',
+		name: options.filename,
 		accessors: false,
 		runes: true,
 		immutable: true
@@ -349,7 +349,7 @@ export function analyze_component(root, source, options) {
 		}
 	}
 
-	const component_name = get_component_name(options.filename ?? 'Component');
+	const component_name = get_component_name(options.filename);
 
 	const runes = options.runes ?? Array.from(module.scope.references.keys()).some(is_rune);
 
@@ -390,7 +390,7 @@ export function analyze_component(root, source, options) {
 			hash: root.css
 				? options.cssHash({
 						css: root.css.content.styles,
-						filename: options.filename ?? '<unknown>',
+						filename: options.filename,
 						name: component_name,
 						hash
 					})

packages/svelte/src/compiler/phases/3-transform/client/transform-client.js

@@ -505,14 +505,12 @@ export function client_component(analysis, options) {
 	}
 
 	if (dev) {
-		if (filename) {
-			// add `App[$.FILENAME] = 'App.svelte'` so that we can print useful messages later
-			body.unshift(
-				b.stmt(
-					b.assignment('=', b.member(b.id(analysis.name), '$.FILENAME', true), b.literal(filename))
-				)
-			);
-		}
+		// add `App[$.FILENAME] = 'App.svelte'` so that we can print useful messages later
+		body.unshift(
+			b.stmt(
+				b.assignment('=', b.member(b.id(analysis.name), '$.FILENAME', true), b.literal(filename))
+			)
+		);
 
 		body.unshift(b.stmt(b.call(b.id('$.mark_module_start'))));
 		body.push(b.stmt(b.call(b.id('$.mark_module_end'), b.id(analysis.name))));

packages/svelte/src/compiler/phases/3-transform/index.js

@@ -80,7 +80,7 @@ export function transform_module(analysis, source, options) {
 			? server_module(analysis, options)
 			: client_module(analysis, options);
 
-	const basename = (options.filename ?? 'Module').split(/[/\\]/).at(-1);
+	const basename = options.filename.split(/[/\\]/).at(-1);
 	if (program.body.length > 0) {
 		program.body[0].leadingComments = [
 			{

packages/svelte/src/compiler/phases/3-transform/server/transform-server.js

@@ -356,7 +356,7 @@ export function server_component(analysis, options) {
 		body.push(b.export_default(component_function));
 	}
 
-	if (dev && filename) {
+	if (dev) {
 		// add `App[$.FILENAME] = 'App.svelte'` so that we can print useful messages later
 		body.unshift(
 			b.stmt(

packages/svelte/src/compiler/state.js

@@ -8,9 +8,9 @@ import { getLocator } from 'locate-character';
 export let warnings = [];
 
 /**
- * The filename (if specified in the compiler options) relative to the rootDir (if specified).
+ * The filename relative to the rootDir (if specified).
  * This should not be used in the compiler output except in dev mode
- * @type {string | undefined}
+ * @type {string}
  */
 export let filename;
 
@@ -77,20 +77,16 @@ export function is_ignored(node, code) {
 
 /**
  * @param {string} _source
- * @param {{ dev?: boolean; filename?: string; rootDir?: string }} options
+ * @param {{ dev?: boolean; filename: string; rootDir?: string }} options
  */
 export function reset(_source, options) {
 	source = _source;
 	const root_dir = options.rootDir?.replace(/\\/g, '/');
-	filename = options.filename?.replace(/\\/g, '/');
+	filename = options.filename.replace(/\\/g, '/');
 
 	dev = !!options.dev;
 
-	if (
-		typeof filename === 'string' &&
-		typeof root_dir === 'string' &&
-		filename.startsWith(root_dir)
-	) {
+	if (typeof root_dir === 'string' && filename.startsWith(root_dir)) {
 		// make filename relative to rootDir
 		filename = filename.replace(root_dir, '').replace(/^[/\\]/, '');
 	}

packages/svelte/src/compiler/types/index.d.ts

@@ -56,7 +56,7 @@ export interface CompileError extends ICompileDiagnostic {}
 
 export type CssHashGetter = (args: {
 	name: string;
-	filename: string | undefined;
+	filename: string;
 	css: string;
 	hash: (input: string) => string;
 }) => string;
@@ -219,11 +219,7 @@ export interface ModuleCompileOptions {
 
 // The following two somewhat scary looking types ensure that certain types are required but can be undefined still
 
-export type ValidatedModuleCompileOptions = Omit<
-	Required<ModuleCompileOptions>,
-	'filename' | 'rootDir'
-> & {
-	filename: ModuleCompileOptions['filename'];
+export type ValidatedModuleCompileOptions = Omit<Required<ModuleCompileOptions>, 'rootDir'> & {
 	rootDir: ModuleCompileOptions['rootDir'];
 };
 

packages/svelte/src/compiler/utils/mapped_code.js

@@ -393,7 +393,7 @@ export function parse_attached_sourcemap(processed, tag_name) {
  */
 export function merge_with_preprocessor_map(result, options, source_name) {
 	if (options.sourcemap) {
-		const file_basename = get_basename(options.filename || 'input.svelte');
+		const file_basename = get_basename(options.filename);
 		// The preprocessor map is expected to contain `sources: [basename_of_filename]`, but our own
 		// map may contain a different file name. Patch our map beforehand to align sources so merging
 		// with the preprocessor map works correctly.
@@ -442,11 +442,10 @@ export function get_basename(filename) {
 }
 
 /**
- * @param {string | undefined} filename
+ * @param {string} filename
  * @param {string | undefined} output_filename
  * @param {string} fallback
  */
 export function get_source_name(filename, output_filename, fallback) {
-	if (!filename) return fallback;
 	return output_filename ? get_relative_path(output_filename, filename) : get_basename(filename);
 }

packages/svelte/src/compiler/validate-options.js

@@ -9,7 +9,7 @@ import * as w from './warnings.js';
  */
 
 const common = {
-	filename: string(undefined),
+	filename: string('(unknown)'),
 
 	// default to process.cwd() where it exists to replicate svelte4 behavior
 	// see https://github.com/sveltejs/svelte/blob/b62fc8c8fd2640c9b99168f01b9d958cb2f7574f/packages/svelte/src/compiler/compile/Component.js#L211

packages/svelte/src/internal/client/dom/elements/events.js

@@ -310,11 +310,7 @@ export function apply(
 		handler.apply(element, args);
 	} else if (has_side_effects || handler != null) {
 		const filename = component?.[FILENAME];
-		const location = filename
-			? loc
-				? ` at ${filename}:${loc[0]}:${loc[1]}`
-				: ` in ${filename}`
-			: '';
+		const location = loc ? ` at ${filename}:${loc[0]}:${loc[1]}` : ` in ${filename}`;
 
 		const event_name = args[0].type;
 		const description = `\`${event_name}\` handler${location}`;

packages/svelte/src/internal/client/runtime.js

@@ -230,12 +230,14 @@ function handle_error(error, effect, component_context) {
 	let current_context = component_context;
 
 	while (current_context !== null) {
-		/** @type {string} */
-		var filename = current_context.function?.[FILENAME];
+		if (DEV) {
+			/** @type {string} */
+			var filename = current_context.function?.[FILENAME];
 
-		if (filename) {
-			const file = filename.split('/').pop();
-			component_stack.push(file);
+			if (filename) {
+				const file = filename.split('/').pop();
+				component_stack.push(file);
+			}
 		}
 
 		current_context = current_context.p;

packages/svelte/src/internal/client/validate.js

@@ -102,7 +102,7 @@ export function validate_binding(binding, get_object, get_property, line, column
 		ran = true;
 
 		if (effect.deps === null) {
-			var location = filename && `${filename}:${line}:${column}`;
+			var location = `${filename}:${line}:${column}`;
 			w.binding_property_non_reactive(binding, location);
 
 			warned = true;

packages/svelte/types/index.d.ts

@@ -740,7 +740,7 @@ declare module 'svelte/compiler' {
 
 	type CssHashGetter = (args: {
 		name: string;
-		filename: string | undefined;
+		filename: string;
 		css: string;
 		hash: (input: string) => string;
 	}) => string;
@@ -2613,7 +2613,7 @@ declare module 'svelte/types/compiler/interfaces' {
 
 	type CssHashGetter = (args: {
 		name: string;
-		filename: string | undefined;
+		filename: string;
 		css: string;
 		hash: (input: string) => string;
 	}) => string;