77 lines
2.1 KiB
JavaScript
77 lines
2.1 KiB
JavaScript
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'use strict';
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const {isOpeningParenToken, isClosingParenToken} = require('@eslint-community/eslint-utils');
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const assertToken = require('./utils/assert-token.js');
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const MESSAGE_ID_WITH_NAME = 'with-name';
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const MESSAGE_ID_WITHOUT_NAME = 'without-name';
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const messages = {
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[MESSAGE_ID_WITH_NAME]: 'Remove unused catch binding `{{name}}`.',
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[MESSAGE_ID_WITHOUT_NAME]: 'Remove unused catch binding.',
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};
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const selector = [
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'CatchClause',
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' > ',
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'.param',
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].join('');
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/** @param {import('eslint').Rule.RuleContext} context */
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const create = context => ({
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[selector](node) {
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const variables = context.getDeclaredVariables(node.parent);
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if (variables.some(variable => variable.references.length > 0)) {
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return;
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}
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const {type, name, parent} = node;
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return {
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node,
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messageId: type === 'Identifier' ? MESSAGE_ID_WITH_NAME : MESSAGE_ID_WITHOUT_NAME,
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data: {name},
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* fix(fixer) {
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const sourceCode = context.getSourceCode();
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const tokenBefore = sourceCode.getTokenBefore(node);
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assertToken(tokenBefore, {
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test: isOpeningParenToken,
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expected: '(',
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ruleId: 'prefer-optional-catch-binding',
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});
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const tokenAfter = sourceCode.getTokenAfter(node);
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assertToken(tokenAfter, {
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test: isClosingParenToken,
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expected: ')',
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ruleId: 'prefer-optional-catch-binding',
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});
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yield fixer.remove(tokenBefore);
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yield fixer.remove(node);
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yield fixer.remove(tokenAfter);
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const [, endOfClosingParenthesis] = tokenAfter.range;
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const [startOfCatchClauseBody] = parent.body.range;
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const text = sourceCode.text.slice(endOfClosingParenthesis, startOfCatchClauseBody);
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const leadingSpacesLength = text.length - text.trimStart().length;
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if (leadingSpacesLength !== 0) {
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yield fixer.removeRange([endOfClosingParenthesis, endOfClosingParenthesis + leadingSpacesLength]);
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}
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},
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};
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},
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});
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/** @type {import('eslint').Rule.RuleModule} */
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module.exports = {
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create,
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meta: {
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type: 'suggestion',
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docs: {
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description: 'Prefer omitting the `catch` binding parameter.',
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},
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fixable: 'code',
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messages,
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},
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};
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