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feat: add fixer to require-store-callbacks-use-set-param (#1165)
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‎.changeset/clear-mugs-rush.md

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---
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'eslint-plugin-svelte': minor
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---
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Adds a suggestion to the `require-store-callbacks-use-set-param` rule to automatically rename or add function parameters.

‎README.md

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@@ -272,7 +272,7 @@ These rules relate to possible syntax or logic errors in Svelte code:
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| [svelte/no-shorthand-style-property-overrides](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-shorthand-style-property-overrides/) | disallow shorthand style properties that override related longhand properties | :star: |
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| [svelte/no-store-async](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-store-async/) | disallow using async/await inside svelte stores because it causes issues with the auto-unsubscribing features | :star: |
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| [svelte/no-unknown-style-directive-property](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-unknown-style-directive-property/) | disallow unknown `style:property` | :star: |
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| [svelte/require-store-callbacks-use-set-param](https://sveltejs.github.io/eslint-plugin-svelte/rules/require-store-callbacks-use-set-param/) | store callbacks must use `set` param | |
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| [svelte/require-store-callbacks-use-set-param](https://sveltejs.github.io/eslint-plugin-svelte/rules/require-store-callbacks-use-set-param/) | store callbacks must use `set` param | :bulb: |
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| [svelte/require-store-reactive-access](https://sveltejs.github.io/eslint-plugin-svelte/rules/require-store-reactive-access/) | disallow to use of the store itself as an operand. Need to use $ prefix or get function. | :star::wrench: |
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| [svelte/valid-compile](https://sveltejs.github.io/eslint-plugin-svelte/rules/valid-compile/) | disallow warnings when compiling. | |
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| [svelte/valid-style-parse](https://sveltejs.github.io/eslint-plugin-svelte/rules/valid-style-parse/) | require valid style element parsing | |

‎docs/rules.md

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@@ -29,7 +29,7 @@ These rules relate to possible syntax or logic errors in Svelte code:
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| [svelte/no-shorthand-style-property-overrides](./rules/no-shorthand-style-property-overrides.md) | disallow shorthand style properties that override related longhand properties | :star: |
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| [svelte/no-store-async](./rules/no-store-async.md) | disallow using async/await inside svelte stores because it causes issues with the auto-unsubscribing features | :star: |
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| [svelte/no-unknown-style-directive-property](./rules/no-unknown-style-directive-property.md) | disallow unknown `style:property` | :star: |
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| [svelte/require-store-callbacks-use-set-param](./rules/require-store-callbacks-use-set-param.md) | store callbacks must use `set` param | |
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| [svelte/require-store-callbacks-use-set-param](./rules/require-store-callbacks-use-set-param.md) | store callbacks must use `set` param | :bulb: |
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| [svelte/require-store-reactive-access](./rules/require-store-reactive-access.md) | disallow to use of the store itself as an operand. Need to use $ prefix or get function. | :star::wrench: |
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| [svelte/valid-compile](./rules/valid-compile.md) | disallow warnings when compiling. | |
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| [svelte/valid-style-parse](./rules/valid-style-parse.md) | require valid style element parsing | |

‎docs/rules/require-store-callbacks-use-set-param.md

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@@ -10,6 +10,8 @@ since: 'v2.12.0'
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> store callbacks must use `set` param
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- :bulb: Some problems reported by this rule are manually fixable by editor [suggestions](https://eslint.org/docs/developer-guide/working-with-rules#providing-suggestions).
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## :book: Rule Details
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This rule disallows if `readable` / `writable` store's setter function doesn't use `set` parameter.<br>

‎packages/eslint-plugin-svelte/src/rules/derived-has-same-inputs-outputs.ts

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@@ -3,34 +3,7 @@ import type { Variable } from '@typescript-eslint/scope-manager';
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import { createRule } from '../utils/index.js';
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import type { RuleContext, RuleFixer } from '../types.js';
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import { extractStoreReferences } from './reference-helpers/svelte-store.js';
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import { getScope } from '../utils/ast-utils.js';
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function findVariableForName(
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context: RuleContext,
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node: TSESTree.Node,
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name: string,
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expectedName: string
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): { hasConflict: boolean; variable: Variable | null } {
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const scope = getScope(context, node);
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let variable: Variable | null = null;
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for (const ref of scope.references) {
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if (ref.identifier.name === expectedName) {
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return { hasConflict: true, variable: null };
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}
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}
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for (const v of scope.variables) {
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if (v.name === expectedName) {
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return { hasConflict: true, variable: null };
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}
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if (v.name === name) {
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variable = v;
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}
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}
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return { hasConflict: false, variable };
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}
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import { findVariableForReplacement } from '../utils/ast-utils.js';
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function createFixer(node: TSESTree.Node, variable: Variable | null, name: string) {
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return function* fix(fixer: RuleFixer) {
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if (fnParam.type !== 'Identifier') return;
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const expectedName = `$${args.name}`;
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if (expectedName !== fnParam.name) {
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const { hasConflict, variable } = findVariableForName(
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const { hasConflict, variable } = findVariableForReplacement(
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context,
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fn.body,
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fnParam.name,
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if (element && element.type === 'Identifier' && argName) {
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const expectedName = `$${argName}`;
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if (expectedName !== element.name) {
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const { hasConflict, variable } = findVariableForName(
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const { hasConflict, variable } = findVariableForReplacement(
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context,
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fn.body,
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element.name,

‎packages/eslint-plugin-svelte/src/rules/require-store-callbacks-use-set-param.ts

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import { findVariableForReplacement } from '../utils/ast-utils.js';
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import type { SuggestionReportDescriptor } from '../types.js';
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import { createRule } from '../utils/index.js';
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import { extractStoreReferences } from './reference-helpers/svelte-store.js';
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import { getSourceCode } from '../utils/compat.js';
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export default createRule('require-store-callbacks-use-set-param', {
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meta: {
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category: 'Possible Errors',
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recommended: false
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},
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hasSuggestions: true,
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schema: [],
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messages: {
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unexpected: 'Store callbacks must use `set` param.'
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unexpected: 'Store callbacks must use `set` param.',
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updateParam: 'Rename parameter from {{oldName}} to `set`.',
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addParam: 'Add a `set` parameter.'
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},
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type: 'suggestion'
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},
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}
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const param = fn.params[0];
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if (!param || (param.type === 'Identifier' && param.name !== 'set')) {
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const { hasConflict, variable } = findVariableForReplacement(
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context,
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fn.body,
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param ? param.name : null,
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'set'
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);
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const suggest: SuggestionReportDescriptor[] = [];
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if (!hasConflict) {
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if (param) {
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suggest.push({
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messageId: 'updateParam',
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data: { oldName: param.name },
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*fix(fixer) {
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yield fixer.replaceText(param, 'set');
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if (variable) {
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for (const ref of variable.references) {
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yield fixer.replaceText(ref.identifier, 'set');
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}
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}
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}
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});
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} else {
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const token = getSourceCode(context).getTokenBefore(fn.body, {
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filter: (token) => token.type === 'Punctuator' && token.value === '(',
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includeComments: false
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});
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if (token) {
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suggest.push({
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messageId: 'addParam',
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fix(fixer) {
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return fixer.insertTextAfter(token, 'set');
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}
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});
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}
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}
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}
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context.report({
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node: fn,
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loc: fn.loc,
30-
messageId: 'unexpected'
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messageId: 'unexpected',
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suggest
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});
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}
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}

‎packages/eslint-plugin-svelte/src/utils/ast-utils.ts

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return getSourceCode(context).getText(node);
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}
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/**
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* Finds the variable for a given name in the specified node's scope.
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* Also determines if the replacement name is already in use.
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*
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* If the `name` is set to null, this assumes you're adding a new variable
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* and reports if it is already in use.
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*/
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export function findVariableForReplacement(
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context: RuleContext,
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node: TSESTree.Node,
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name: string | null,
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replacementName: string
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): { hasConflict: boolean; variable: Variable | null } {
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const scope = getScope(context, node);
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let variable: Variable | null = null;
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for (const ref of scope.references) {
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if (ref.identifier.name === replacementName) {
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return { hasConflict: true, variable: null };
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}
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}
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for (const v of scope.variables) {
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if (v.name === replacementName) {
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return { hasConflict: true, variable: null };
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}
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if (v.name === name) {
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variable = v;
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}
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}
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return { hasConflict: false, variable };
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}

‎packages/eslint-plugin-svelte/tests/fixtures/rules/require-store-callbacks-use-set-param/invalid/test01-errors.yaml

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- message: Store callbacks must use `set` param.
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line: 4
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column: 18
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suggestions: null
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suggestions:
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- desc: Add a `set` parameter.
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messageId: addParam
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output: |
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<script>
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import { readable, writable } from 'svelte/store';
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readable(false, (set) => true);
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readable(false, (foo) => true);
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writable(false, () => true);
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writable(false, (foo) => true);
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readable(false, (foo) => {
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foo;
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insideACallback(() => {
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foo;
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});
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conflictingName(() => {
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const foo = 303;
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foo;
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});
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});
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readable(false, () => {
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const set = 303;
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});
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insideACallback(() => {
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const set = 303;
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readable(false, () => {
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set;
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});
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});
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</script>
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- message: Store callbacks must use `set` param.
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line: 5
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column: 18
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suggestions: null
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suggestions:
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- desc: Rename parameter from foo to `set`.
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messageId: updateParam
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output: |
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<script>
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import { readable, writable } from 'svelte/store';
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readable(false, () => true);
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readable(false, (set) => true);
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writable(false, () => true);
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writable(false, (foo) => true);
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readable(false, (foo) => {
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foo;
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insideACallback(() => {
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foo;
59+
});
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conflictingName(() => {
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const foo = 303;
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foo;
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});
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});
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readable(false, () => {
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const set = 303;
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});
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insideACallback(() => {
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const set = 303;
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readable(false, () => {
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set;
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});
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});
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</script>
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- message: Store callbacks must use `set` param.
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line: 7
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column: 18
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suggestions: null
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suggestions:
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- desc: Add a `set` parameter.
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messageId: addParam
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output: |
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<script>
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import { readable, writable } from 'svelte/store';
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readable(false, () => true);
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readable(false, (foo) => true);
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writable(false, (set) => true);
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writable(false, (foo) => true);
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readable(false, (foo) => {
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foo;
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insideACallback(() => {
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foo;
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});
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conflictingName(() => {
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const foo = 303;
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foo;
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});
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});
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readable(false, () => {
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const set = 303;
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});
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insideACallback(() => {
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const set = 303;
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readable(false, () => {
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set;
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});
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});
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</script>
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- message: Store callbacks must use `set` param.
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line: 8
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column: 18
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suggestions:
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- desc: Rename parameter from foo to `set`.
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messageId: updateParam
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output: |
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<script>
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import { readable, writable } from 'svelte/store';
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readable(false, () => true);
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readable(false, (foo) => true);
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writable(false, () => true);
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writable(false, (set) => true);
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readable(false, (foo) => {
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foo;
133+
insideACallback(() => {
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foo;
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});
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conflictingName(() => {
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const foo = 303;
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foo;
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});
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});
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readable(false, () => {
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const set = 303;
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});
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insideACallback(() => {
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const set = 303;
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readable(false, () => {
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set;
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});
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});
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</script>
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- message: Store callbacks must use `set` param.
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line: 10
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column: 18
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suggestions:
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- desc: Rename parameter from foo to `set`.
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messageId: updateParam
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output: |
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<script>
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import { readable, writable } from 'svelte/store';
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readable(false, () => true);
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readable(false, (foo) => true);
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writable(false, () => true);
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writable(false, (foo) => true);
168+
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readable(false, (set) => {
170+
set;
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insideACallback(() => {
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set;
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});
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conflictingName(() => {
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const foo = 303;
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foo;
177+
});
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});
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readable(false, () => {
181+
const set = 303;
182+
});
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insideACallback(() => {
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const set = 303;
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readable(false, () => {
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set;
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});
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});
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</script>
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- message: Store callbacks must use `set` param.
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line: 21
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column: 18
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suggestions: null
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- message: Store callbacks must use `set` param.
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line: 27
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column: 19
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suggestions: null

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