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/**
* @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"
},
create(context) {
const ERROR_MESSAGE = "Expected variable declaration to be on a new line.";
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,
message: ERROR_MESSAGE,
loc: current.loc.start,
fix: fixer => fixer.insertTextBefore(current, "\n")
});
}
}
prev = current;
});
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
VariableDeclaration: checkForNewLine
};
}
};
|
