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/**
* @fileoverview A rule to suggest using of the spread operator instead of `.apply()`.
* @author Toru Nagashima
*/
"use strict";
const astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Checks whether or not a node is a `.apply()` for variadic.
* @param {ASTNode} node - A CallExpression node to check.
* @returns {boolean} Whether or not the node is a `.apply()` for variadic.
*/
function isVariadicApplyCalling(node) {
return (
node.callee.type === "MemberExpression" &&
node.callee.property.type === "Identifier" &&
node.callee.property.name === "apply" &&
node.callee.computed === false &&
node.arguments.length === 2 &&
node.arguments[1].type !== "ArrayExpression" &&
node.arguments[1].type !== "SpreadElement"
);
}
/**
* Checks whether or not `thisArg` is not changed by `.apply()`.
* @param {ASTNode|null} expectedThis - The node that is the owner of the applied function.
* @param {ASTNode} thisArg - The node that is given to the first argument of the `.apply()`.
* @param {RuleContext} context - The ESLint rule context object.
* @returns {boolean} Whether or not `thisArg` is not changed by `.apply()`.
*/
function isValidThisArg(expectedThis, thisArg, context) {
if (!expectedThis) {
return astUtils.isNullOrUndefined(thisArg);
}
return astUtils.equalTokens(expectedThis, thisArg, context);
}
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require spread operators instead of `.apply()`",
category: "ECMAScript 6",
recommended: false,
url: "https://eslint.org/docs/rules/prefer-spread"
},
schema: [],
fixable: "code"
},
create(context) {
const sourceCode = context.getSourceCode();
return {
CallExpression(node) {
if (!isVariadicApplyCalling(node)) {
return;
}
const applied = node.callee.object;
const expectedThis = (applied.type === "MemberExpression") ? applied.object : null;
const thisArg = node.arguments[0];
if (isValidThisArg(expectedThis, thisArg, sourceCode)) {
context.report({
node,
message: "Use the spread operator instead of '.apply()'.",
fix(fixer) {
if (expectedThis && expectedThis.type !== "Identifier") {
// Don't fix cases where the `this` value could be a computed expression.
return null;
}
const propertyDot = sourceCode.getFirstTokenBetween(applied, node.callee.property, token => token.value === ".");
return fixer.replaceTextRange([propertyDot.range[0], node.range[1]], `(...${sourceCode.getText(node.arguments[1])})`);
}
});
}
}
};
}
};
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