| /** |
| * @fileoverview enforce default parameters to be last |
| * @author Chiawen Chen |
| */ |
| |
| "use strict"; |
| |
| /** @type {import('../shared/types').Rule} */ |
| module.exports = { |
| meta: { |
| type: "suggestion", |
| |
| docs: { |
| description: "enforce default parameters to be last", |
| recommended: false, |
| url: "https://eslint.org/docs/rules/default-param-last" |
| }, |
| |
| schema: [], |
| |
| messages: { |
| shouldBeLast: "Default parameters should be last." |
| } |
| }, |
| |
| create(context) { |
| |
| /** |
| * Handler for function contexts. |
| * @param {ASTNode} node function node |
| * @returns {void} |
| */ |
| function handleFunction(node) { |
| let hasSeenPlainParam = false; |
| |
| for (let i = node.params.length - 1; i >= 0; i -= 1) { |
| const param = node.params[i]; |
| |
| if ( |
| param.type !== "AssignmentPattern" && |
| param.type !== "RestElement" |
| ) { |
| hasSeenPlainParam = true; |
| continue; |
| } |
| |
| if (hasSeenPlainParam && param.type === "AssignmentPattern") { |
| context.report({ |
| node: param, |
| messageId: "shouldBeLast" |
| }); |
| } |
| } |
| } |
| |
| return { |
| FunctionDeclaration: handleFunction, |
| FunctionExpression: handleFunction, |
| ArrowFunctionExpression: handleFunction |
| }; |
| } |
| }; |