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63 lines
1.6 KiB
JavaScript
63 lines
1.6 KiB
JavaScript
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/**
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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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module.exports = {
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meta: {
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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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category: "Best Practices",
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recommended: false,
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url: "https://eslint.org/docs/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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// eslint-disable-next-line jsdoc/require-description
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/**
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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 hasSeenPlainParam = false;
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for (let i = node.params.length - 1; i >= 0; i -= 1) {
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const param = node.params[i];
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if (
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param.type !== "AssignmentPattern" &&
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param.type !== "RestElement"
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) {
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hasSeenPlainParam = true;
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continue;
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}
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if (hasSeenPlainParam && param.type === "AssignmentPattern") {
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context.report({
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node: param,
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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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