79 lines
1.7 KiB
JavaScript
Executable File
79 lines
1.7 KiB
JavaScript
Executable File
/**
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* @fileoverview enforce default parameters to be last
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* @author Chiawen Chen
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*/
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"use strict";
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/**
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* Checks if node is required: i.e. does not have a default value or ? optional indicator.
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* @param {ASTNode} node the node to be evaluated
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* @returns {boolean} true if the node is required, false if not.
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*/
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function isRequiredParameter(node) {
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return !(
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node.type === "AssignmentPattern" ||
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node.type === "RestElement" ||
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node.optional
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);
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}
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/** @type {import('../types').Rule.RuleModule} */
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module.exports = {
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meta: {
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dialects: ["javascript", "typescript"],
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language: "javascript",
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type: "suggestion",
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docs: {
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description: "Enforce default parameters to be last",
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recommended: false,
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frozen: true,
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url: "https://eslint.org/docs/latest/rules/default-param-last",
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},
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schema: [],
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messages: {
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shouldBeLast: "Default parameters should be last.",
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},
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},
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create(context) {
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/**
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* Handler for function contexts.
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* @param {ASTNode} node function node
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* @returns {void}
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*/
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function handleFunction(node) {
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let hasSeenRequiredParameter = false;
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for (let i = node.params.length - 1; i >= 0; i -= 1) {
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const current = node.params[i];
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const param =
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current.type === "TSParameterProperty"
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? current.parameter
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: current;
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if (isRequiredParameter(param)) {
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hasSeenRequiredParameter = true;
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continue;
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}
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if (hasSeenRequiredParameter) {
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context.report({
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node: current,
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messageId: "shouldBeLast",
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});
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}
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}
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}
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return {
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FunctionDeclaration: handleFunction,
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FunctionExpression: handleFunction,
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ArrowFunctionExpression: handleFunction,
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};
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},
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};
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