104 lines
3.1 KiB
JavaScript
104 lines
3.1 KiB
JavaScript
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/**
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* @fileoverview Rule to flag when a function has too many parameters
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* @author Ilya Volodin
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const lodash = require("lodash");
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const astUtils = require("../util/ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "suggestion",
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docs: {
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description: "enforce a maximum number of parameters in function definitions",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/max-params"
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},
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schema: [
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{
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oneOf: [
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{
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type: "integer",
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minimum: 0
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},
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{
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type: "object",
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properties: {
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maximum: {
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type: "integer",
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minimum: 0
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},
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max: {
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type: "integer",
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minimum: 0
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}
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},
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additionalProperties: false
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}
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]
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}
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],
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messages: {
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exceed: "{{name}} has too many parameters ({{count}}). Maximum allowed is {{max}}."
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}
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},
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create(context) {
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const sourceCode = context.getSourceCode();
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const option = context.options[0];
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let numParams = 3;
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if (
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typeof option === "object" &&
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(Object.prototype.hasOwnProperty.call(option, "maximum") || Object.prototype.hasOwnProperty.call(option, "max"))
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) {
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numParams = option.maximum || option.max;
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}
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if (typeof option === "number") {
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numParams = option;
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}
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/**
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* Checks a function to see if it has too many parameters.
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* @param {ASTNode} node The node to check.
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* @returns {void}
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* @private
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*/
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function checkFunction(node) {
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if (node.params.length > numParams) {
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context.report({
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loc: astUtils.getFunctionHeadLoc(node, sourceCode),
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node,
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messageId: "exceed",
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data: {
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name: lodash.upperFirst(astUtils.getFunctionNameWithKind(node)),
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count: node.params.length,
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max: numParams
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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: checkFunction,
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ArrowFunctionExpression: checkFunction,
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FunctionExpression: checkFunction
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};
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}
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};
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