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/**
* @fileoverview Rule to flag use of an empty block statement
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../shared/types').Rule} */
module.exports = {
meta: {
hasSuggestions: true,
type: "suggestion",
defaultOptions: [{
allowEmptyCatch: false
}],
docs: {
description: "Disallow empty block statements",
recommended: true,
url: "https://eslint.org/docs/latest/rules/no-empty"
},
schema: [
{
type: "object",
properties: {
allowEmptyCatch: {
type: "boolean"
}
},
additionalProperties: false
}
],
messages: {
unexpected: "Empty {{type}} statement.",
suggestComment: "Add comment inside empty {{type}} statement."
}
},
create(context) {
const [{ allowEmptyCatch }] = context.options;
const sourceCode = context.sourceCode;
return {
BlockStatement(node) {
// if the body is not empty, we can just return immediately
if (node.body.length !== 0) {
return;
}
// a function is generally allowed to be empty
if (astUtils.isFunction(node.parent)) {
return;
}
if (allowEmptyCatch && node.parent.type === "CatchClause") {
return;
}
// any other block is only allowed to be empty, if it contains a comment
if (sourceCode.getCommentsInside(node).length > 0) {
return;
}
context.report({
node,
messageId: "unexpected",
data: { type: "block" },
suggest: [
{
messageId: "suggestComment",
data: { type: "block" },
fix(fixer) {
const range = [node.range[0] + 1, node.range[1] - 1];
return fixer.replaceTextRange(range, " /* empty */ ");
}
}
]
});
},
SwitchStatement(node) {
if (typeof node.cases === "undefined" || node.cases.length === 0) {
context.report({ node, messageId: "unexpected", data: { type: "switch" } });
}
}
};
}
};