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one-var-declaration-per-line.js 2.77 KiB
/**
 * @fileoverview Rule to check multiple var declarations per line
 * @author Alberto Rodríguez
 */
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
    meta: {
        type: "suggestion",
        docs: {
            description: "require or disallow newlines around variable declarations",
            category: "Stylistic Issues",
            recommended: false,
            url: "https://eslint.org/docs/rules/one-var-declaration-per-line"
        schema: [
                enum: ["always", "initializations"]
        fixable: "whitespace",
        messages: {
            expectVarOnNewline: "Expected variable declaration to be on a new line."
    create(context) {
        const always = context.options[0] === "always";
        //--------------------------------------------------------------------------
        // Helpers
        //--------------------------------------------------------------------------
        /**
         * Determine if provided keyword is a variant of for specifiers
         * @private
         * @param {string} keyword keyword to test
         * @returns {boolean} True if `keyword` is a variant of for specifier
        function isForTypeSpecifier(keyword) {
            return keyword === "ForStatement" || keyword === "ForInStatement" || keyword === "ForOfStatement";
        /**
         * Checks newlines around variable declarations.
         * @private
         * @param {ASTNode} node `VariableDeclaration` node to test
         * @returns {void}
        function checkForNewLine(node) {
            if (isForTypeSpecifier(node.parent.type)) {
                return;
            const declarations = node.declarations;
            let prev;
            declarations.forEach(current => {
                if (prev && prev.loc.end.line === current.loc.start.line) {
                    if (always || prev.init || current.init) {
context.report({ node, messageId: "expectVarOnNewline", loc: current.loc, fix: fixer => fixer.insertTextBefore(current, "\n") }); } } prev = current; }); } //-------------------------------------------------------------------------- // Public //-------------------------------------------------------------------------- return { VariableDeclaration: checkForNewLine }; } };