104 lines
3.1 KiB
JavaScript
104 lines
3.1 KiB
JavaScript
/**
|
|
* @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",
|
|
|
|
docs: {
|
|
description: "Disallow empty block statements",
|
|
recommended: true,
|
|
url: "https://eslint.org/docs/latest/rules/no-empty"
|
|
},
|
|
|
|
schema: [
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
allowEmptyCatch: {
|
|
type: "boolean",
|
|
default: false
|
|
}
|
|
},
|
|
additionalProperties: false
|
|
}
|
|
],
|
|
|
|
messages: {
|
|
unexpected: "Empty {{type}} statement.",
|
|
suggestComment: "Add comment inside empty {{type}} statement."
|
|
}
|
|
},
|
|
|
|
create(context) {
|
|
const options = context.options[0] || {},
|
|
allowEmptyCatch = options.allowEmptyCatch || false;
|
|
|
|
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" } });
|
|
}
|
|
}
|
|
};
|
|
|
|
}
|
|
};
|