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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 | |
| //------------------------------------------------------------------------------ | |
| module.exports = { | |
| meta: { | |
| type: "suggestion", | |
| docs: { | |
| description: "disallow empty block statements", | |
| category: "Possible Errors", | |
| recommended: true, | |
| url: "https://eslint.org/docs/rules/no-empty" | |
| }, | |
| schema: [ | |
| { | |
| type: "object", | |
| properties: { | |
| allowEmptyCatch: { | |
| type: "boolean", | |
| default: false | |
| } | |
| }, | |
| additionalProperties: false | |
| } | |
| ], | |
| messages: { | |
| unexpected: "Empty {{type}} statement." | |
| } | |
| }, | |
| create(context) { | |
| const options = context.options[0] || {}, | |
| allowEmptyCatch = options.allowEmptyCatch || false; | |
| const sourceCode = context.getSourceCode(); | |
| 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" } }); | |
| }, | |
| SwitchStatement(node) { | |
| if (typeof node.cases === "undefined" || node.cases.length === 0) { | |
| context.report({ node, messageId: "unexpected", data: { type: "switch" } }); | |
| } | |
| } | |
| }; | |
| } | |
| }; |