upgrade ESLint config (sveltejs#5472)

package.json

@@ -37,7 +37,7 @@
     "posttest": "agadoo internal/index.mjs",
     "prepublishOnly": "npm run lint && PUBLISH=true npm test",
     "tsd": "tsc -p src/compiler --emitDeclarationOnly && tsc -p src/runtime --emitDeclarationOnly",
-    "lint": "eslint \"{src,test}/**/*.{ts,js}\""
+    "lint": "eslint '{src,test}/**/*.{ts,js}'"
   },
   "repository": {
     "type": "git",
@@ -63,7 +63,7 @@
     "@rollup/plugin-sucrase": "^3.0.0",
     "@rollup/plugin-typescript": "^2.0.1",
     "@rollup/plugin-virtual": "^2.0.0",
-    "@sveltejs/eslint-config": "github:sveltejs/eslint-config#v5.0.0",
+    "@sveltejs/eslint-config": "github:sveltejs/eslint-config#v5.2.0",
     "@types/mocha": "^7.0.0",
     "@types/node": "^8.10.53",
     "@typescript-eslint/eslint-plugin": "^3.0.2",

src/compiler/compile/Component.ts

@@ -157,7 +157,7 @@ export default class Component {
 				) || { start: 0, end: 0 };
 				this.warn(svelteOptions, {
 					code: 'custom-element-no-tag',
-					message: `No custom element 'tag' option was specified. To automatically register a custom element, specify a name with a hyphen in it, e.g. <svelte:options tag="my-thing"/>. To hide this warning, use <svelte:options tag={null}/>`
+					message: 'No custom element \'tag\' option was specified. To automatically register a custom element, specify a name with a hyphen in it, e.g. <svelte:options tag="my-thing"/>. To hide this warning, use <svelte:options tag={null}/>'
 				});
 			}
 			this.tag = this.component_options.tag || compile_options.tag;
@@ -241,7 +241,7 @@ export default class Component {
 			const { compile_options, name } = this;
 			const { format = 'esm' } = compile_options;
 
-			const banner = `${this.file ? `${this.file} ` : ``}generated by Svelte v${'__VERSION__'}`;
+			const banner = `${this.file ? `${this.file} ` : ''}generated by Svelte v${'__VERSION__'}`;
 
 			const program: any = { type: 'Program', body: result.js };
 
@@ -458,16 +458,16 @@ export default class Component {
 	extract_exports(node) {
 		if (node.type === 'ExportDefaultDeclaration') {
 			this.error(node, {
-				code: `default-export`,
-				message: `A component cannot have a default export`
+				code: 'default-export',
+				message: 'A component cannot have a default export'
 			});
 		}
 
 		if (node.type === 'ExportNamedDeclaration') {
 			if (node.source) {
 				this.error(node, {
-					code: `not-implemented`,
-					message: `A component currently cannot have an export ... from`
+					code: 'not-implemented',
+					message: 'A component currently cannot have an export ... from'
 				});
 			}
 			if (node.declaration) {
@@ -478,7 +478,7 @@ export default class Component {
 							variable.export_name = name;
 							if (variable.writable && !(variable.referenced || variable.referenced_from_script || variable.subscribable)) {
 								this.warn(declarator, {
-									code: `unused-export-let`,
+									code: 'unused-export-let',
 									message: `${this.name.name} has unused export property '${name}'. If it is for external reference only, please consider using \`export const ${name}\``
 								});
 							}
@@ -501,7 +501,7 @@ export default class Component {
 
 						if (variable.writable && !(variable.referenced || variable.referenced_from_script || variable.subscribable)) {
 							this.warn(specifier, {
-								code: `unused-export-let`,
+								code: 'unused-export-let',
 								message: `${this.name.name} has unused export property '${specifier.exported.name}'. If it is for external reference only, please consider using \`export const ${specifier.exported.name}\``
 							});
 						}
@@ -550,7 +550,7 @@ export default class Component {
 			if (name[0] === '$') {
 				this.error(node as any, {
 					code: 'illegal-declaration',
-					message: `The $ prefix is reserved, and cannot be used for variable and import names`
+					message: 'The $ prefix is reserved, and cannot be used for variable and import names'
 				});
 			}
 
@@ -568,7 +568,7 @@ export default class Component {
 			if (name[0] === '$') {
 				this.error(node as any, {
 					code: 'illegal-subscription',
-					message: `Cannot reference store value inside <script context="module">`
+					message: 'Cannot reference store value inside <script context="module">'
 				});
 			} else {
 				this.add_var({
@@ -629,7 +629,7 @@ export default class Component {
 			if (name[0] === '$') {
 				this.error(node as any, {
 					code: 'illegal-declaration',
-					message: `The $ prefix is reserved, and cannot be used for variable and import names`
+					message: 'The $ prefix is reserved, and cannot be used for variable and import names'
 				});
 			}
 
@@ -867,8 +867,8 @@ export default class Component {
 
 				if (name[1] !== '$' && scope.has(name.slice(1)) && scope.find_owner(name.slice(1)) !== this.instance_scope) {
 					this.error(node, {
-						code: `contextual-store`,
-						message: `Stores must be declared at the top level of the component (this may change in a future version of Svelte)`
+						code: 'contextual-store',
+						message: 'Stores must be declared at the top level of the component (this may change in a future version of Svelte)'
 					});
 				}
 			}
@@ -935,7 +935,7 @@ export default class Component {
 										// TODO is this still true post-#3539?
 										component.error(declarator as any, {
 											code: 'destructured-prop',
-											message: `Cannot declare props in destructured declaration`
+											message: 'Cannot declare props in destructured declaration'
 										});
 									}
 
@@ -1379,23 +1379,23 @@ function process_component_options(component: Component, nodes) {
 				switch (name) {
 					case 'tag': {
 						const code = 'invalid-tag-attribute';
-						const message = `'tag' must be a string literal`;
+						const message = "'tag' must be a string literal";
 						const tag = get_value(attribute, code, message);
 
 						if (typeof tag !== 'string' && tag !== null)
 							component.error(attribute, { code, message });
 
 						if (tag && !/^[a-zA-Z][a-zA-Z0-9]*-[a-zA-Z0-9-]+$/.test(tag)) {
 							component.error(attribute, {
-								code: `invalid-tag-property`,
-								message: `tag name must be two or more words joined by the '-' character`
+								code: 'invalid-tag-property',
+								message: "tag name must be two or more words joined by the '-' character"
 							});
 						}
 
 						if (tag && !component.compile_options.customElement) {
 							component.warn(attribute, {
 								code: 'missing-custom-element-compile-options',
-								message: `The 'tag' option is used when generating a custom element. Did you forget the 'customElement: true' compile option?`
+								message: "The 'tag' option is used when generating a custom element. Did you forget the 'customElement: true' compile option?"
 							});
 						}
 
@@ -1405,7 +1405,7 @@ function process_component_options(component: Component, nodes) {
 
 					case 'namespace': {
 						const code = 'invalid-namespace-attribute';
-						const message = `The 'namespace' attribute must be a string literal representing a valid namespace`;
+						const message = "The 'namespace' attribute must be a string literal representing a valid namespace";
 						const ns = get_value(attribute, code, message);
 
 						if (typeof ns !== 'string')
@@ -1415,12 +1415,12 @@ function process_component_options(component: Component, nodes) {
 							const match = fuzzymatch(ns, valid_namespaces);
 							if (match) {
 								component.error(attribute, {
-									code: `invalid-namespace-property`,
+									code: 'invalid-namespace-property',
 									message: `Invalid namespace '${ns}' (did you mean '${match}'?)`
 								});
 							} else {
 								component.error(attribute, {
-									code: `invalid-namespace-property`,
+									code: 'invalid-namespace-property',
 									message: `Invalid namespace '${ns}'`
 								});
 							}
@@ -1446,14 +1446,14 @@ function process_component_options(component: Component, nodes) {
 
 					default:
 						component.error(attribute, {
-							code: `invalid-options-attribute`,
-							message: `<svelte:options> unknown attribute`
+							code: 'invalid-options-attribute',
+							message: '<svelte:options> unknown attribute'
 						});
 				}
 			} else {
 				component.error(attribute, {
-					code: `invalid-options-attribute`,
-					message: `<svelte:options> can only have static 'tag', 'namespace', 'accessors', 'immutable' and 'preserveWhitespace' attributes`
+					code: 'invalid-options-attribute',
+					message: "<svelte:options> can only have static 'tag', 'namespace', 'accessors', 'immutable' and 'preserveWhitespace' attributes"
 				});
 			}
 		});

src/compiler/compile/css/Selector.ts

@@ -118,8 +118,8 @@ export default class Selector {
 				const selector = block.selectors[i];
 				if (selector.type === 'PseudoClassSelector' && selector.name === 'global') {
 					component.error(selector, {
-						code: `css-invalid-global`,
-						message: `:global(...) must be the first element in a compound selector`
+						code: 'css-invalid-global',
+						message: ':global(...) must be the first element in a compound selector'
 					});
 				}
 			}
@@ -139,8 +139,8 @@ export default class Selector {
 		for (let i = start; i < end; i += 1) {
 			if (this.blocks[i].global) {
 				component.error(this.blocks[i].selectors[0], {
-					code: `css-invalid-global`,
-					message: `:global(...) can be at the start or end of a selector sequence, but not in the middle`
+					code: 'css-invalid-global',
+					message: ':global(...) can be at the start or end of a selector sequence, but not in the middle'
 				});
 			}
 		}
@@ -286,7 +286,7 @@ function test_attribute(operator, expected_value, case_insensitive, value) {
 		case '^=': return value.startsWith(expected_value);
 		case '$=': return value.endsWith(expected_value);
 		case '*=': return value.includes(expected_value);
-		default: throw new Error(`this shouldn't happen`);
+		default: throw new Error("this shouldn't happen");
 	}
 }
 

src/compiler/compile/css/Stylesheet.ts

@@ -5,7 +5,7 @@ import Element from '../nodes/Element';
 import { Ast } from '../../interfaces';
 import Component from '../Component';
 import { CssNode } from './interfaces';
-import hash from "../utils/hash";
+import hash from '../utils/hash';
 
 function remove_css_prefix(name: string): string {
 	return name.replace(/^-((webkit)|(moz)|(o)|(ms))-/, '');
@@ -428,7 +428,7 @@ export default class Stylesheet {
 		this.children.forEach(child => {
 			child.warn_on_unused_selector((selector: Selector) => {
 				component.warn(selector.node, {
-					code: `css-unused-selector`,
+					code: 'css-unused-selector',
 					message: `Unused CSS selector "${this.source.slice(selector.node.start, selector.node.end)}"`
 				});
 			});

src/compiler/compile/index.ts

@@ -46,9 +46,9 @@ function validate_options(options: CompileOptions, warnings: Warning[]) {
 	}
 
 	if (name && /^[a-z]/.test(name)) {
-		const message = `options.name should be capitalised`;
+		const message = 'options.name should be capitalised';
 		warnings.push({
-			code: `options-lowercase-name`,
+			code: 'options-lowercase-name',
 			message,
 			filename,
 			toString: () => message
@@ -58,7 +58,7 @@ function validate_options(options: CompileOptions, warnings: Warning[]) {
 	if (loopGuardTimeout && !dev) {
 		const message = 'options.loopGuardTimeout is for options.dev = true only';
 		warnings.push({
-			code: `options-loop-guard-timeout`,
+			code: 'options-loop-guard-timeout',
 			message,
 			filename,
 			toString: () => message

src/compiler/compile/nodes/Animation.ts

@@ -17,17 +17,17 @@ export default class Animation extends Node {
 
 		if (parent.animation) {
 			component.error(this, {
-				code: `duplicate-animation`,
-				message: `An element can only have one 'animate' directive`
+				code: 'duplicate-animation',
+				message: "An element can only have one 'animate' directive"
 			});
 		}
 
 		const block = parent.parent;
 		if (!block || block.type !== 'EachBlock' || !block.key) {
 			// TODO can we relax the 'immediate child' rule?
 			component.error(this, {
-				code: `invalid-animation`,
-				message: `An element that use the animate directive must be the immediate child of a keyed each block`
+				code: 'invalid-animation',
+				message: 'An element that use the animate directive must be the immediate child of a keyed each block'
 			});
 		}
 

src/compiler/compile/nodes/Binding.ts

@@ -3,7 +3,7 @@ import get_object from '../utils/get_object';
 import Expression from './shared/Expression';
 import Component from '../Component';
 import TemplateScope from './shared/TemplateScope';
-import {dimensions} from "../../utils/patterns";
+import {dimensions} from '../../utils/patterns';
 import { Node as ESTreeNode } from 'estree';
 
 // TODO this should live in a specific binding

src/compiler/compile/nodes/EachBlock.ts

@@ -60,8 +60,8 @@ export default class EachBlock extends AbstractBlock {
 			if (this.children.length !== 1) {
 				const child = this.children.find(child => !!(child as Element).animation);
 				component.error((child as Element).animation, {
-					code: `invalid-animation`,
-					message: `An element that use the animate directive must be the sole child of a keyed each block`
+					code: 'invalid-animation',
+					message: 'An element that use the animate directive must be the sole child of a keyed each block'
 				});
 			}
 		}