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/**
* @fileoverview Enforce spacing between rest and spread operators and their expressions.
* @author Kai Cataldo
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "enforce spacing between rest and spread operators and their expressions",
category: "ECMAScript 6",
recommended: false,
url: "https://eslint.org/docs/rules/rest-spread-spacing"
},
fixable: "whitespace",
schema: [
{
enum: ["always", "never"]
}
]
},
create(context) {
const sourceCode = context.getSourceCode(),
alwaysSpace = context.options[0] === "always";
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Checks whitespace between rest/spread operators and their expressions
* @param {ASTNode} node - The node to check
* @returns {void}
*/
function checkWhiteSpace(node) {
const operator = sourceCode.getFirstToken(node),
nextToken = sourceCode.getTokenAfter(operator),
hasWhitespace = sourceCode.isSpaceBetweenTokens(operator, nextToken);
let type;
switch (node.type) {
case "SpreadElement":
type = "spread";
if (node.parent.type === "ObjectExpression") {
type += " property";
}
break;
case "RestElement":
type = "rest";
if (node.parent.type === "ObjectPattern") {
type += " property";
}
break;
case "ExperimentalSpreadProperty":
type = "spread property";
break;
case "ExperimentalRestProperty":
type = "rest property";
break;
default:
return;
}
if (alwaysSpace && !hasWhitespace) {
context.report({
node,
loc: {
line: operator.loc.end.line,
column: operator.loc.end.column
},
message: "Expected whitespace after {{type}} operator.",
data: {
type
},
fix(fixer) {
return fixer.replaceTextRange([operator.range[1], nextToken.range[0]], " ");
}
});
} else if (!alwaysSpace && hasWhitespace) {
context.report({
node,
loc: {
line: operator.loc.end.line,
column: operator.loc.end.column
},
message: "Unexpected whitespace after {{type}} operator.",
data: {
type
},
fix(fixer) {
return fixer.removeRange([operator.range[1], nextToken.range[0]]);
}
});
}
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
SpreadElement: checkWhiteSpace,
RestElement: checkWhiteSpace,
ExperimentalSpreadProperty: checkWhiteSpace,
ExperimentalRestProperty: checkWhiteSpace
};
}
};