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