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/**
* @fileoverview Enforce spacing between rest and spread operators and their expressions.
* @author Kai Cataldo
* @deprecated in ESLint v8.53.0
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../shared/types').Rule} */
module.exports = {
meta: {
deprecated: {
message: "Formatting rules are being moved out of ESLint core.",
url: "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
deprecatedSince: "8.53.0",
availableUntil: "10.0.0",
replacedBy: [
{
message: "ESLint Stylistic now maintains deprecated stylistic core rules.",
url: "https://eslint.style/guide/migration",
plugin: {
name: "@stylistic/eslint-plugin-js",
url: "https://eslint.style/packages/js"
},
rule: {
name: "rest-spread-spacing",
url: "https://eslint.style/rules/js/rest-spread-spacing"
}
}
]
},
type: "layout",
docs: {
description: "Enforce spacing between rest and spread operators and their expressions",
recommended: false,
url: "https://eslint.org/docs/latest/rules/rest-spread-spacing"
},
fixable: "whitespace",
schema: [
{
enum: ["always", "never"]
}
],
messages: {
unexpectedWhitespace: "Unexpected whitespace after {{type}} operator.",
expectedWhitespace: "Expected whitespace after {{type}} operator."
}
},
create(context) {
const sourceCode = context.sourceCode,
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: operator.loc,
messageId: "expectedWhitespace",
data: {
type
},
fix(fixer) {
return fixer.replaceTextRange([operator.range[1], nextToken.range[0]], " ");
}
});
} else if (!alwaysSpace && hasWhitespace) {
context.report({
node,
loc: {
start: operator.loc.end,
end: nextToken.loc.start
},
messageId: "unexpectedWhitespace",
data: {
type
},
fix(fixer) {
return fixer.removeRange([operator.range[1], nextToken.range[0]]);
}
});
}
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
SpreadElement: checkWhiteSpace,
RestElement: checkWhiteSpace,
ExperimentalSpreadProperty: checkWhiteSpace,
ExperimentalRestProperty: checkWhiteSpace
};
}
};