You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
111 lines
3.0 KiB
111 lines
3.0 KiB
/**
|
|
* @fileoverview Rule to enforce declarations in program or function body root.
|
|
* @author Brandon Mills
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Requirements
|
|
//------------------------------------------------------------------------------
|
|
|
|
const astUtils = require("./utils/ast-utils");
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
const validParent = new Set(["Program", "StaticBlock", "ExportNamedDeclaration", "ExportDefaultDeclaration"]);
|
|
const validBlockStatementParent = new Set(["FunctionDeclaration", "FunctionExpression", "ArrowFunctionExpression"]);
|
|
|
|
/**
|
|
* Finds the nearest enclosing context where this rule allows declarations and returns its description.
|
|
* @param {ASTNode} node Node to search from.
|
|
* @returns {string} Description. One of "program", "function body", "class static block body".
|
|
*/
|
|
function getAllowedBodyDescription(node) {
|
|
let { parent } = node;
|
|
|
|
while (parent) {
|
|
|
|
if (parent.type === "StaticBlock") {
|
|
return "class static block body";
|
|
}
|
|
|
|
if (astUtils.isFunction(parent)) {
|
|
return "function body";
|
|
}
|
|
|
|
({ parent } = parent);
|
|
}
|
|
|
|
return "program";
|
|
}
|
|
|
|
/** @type {import('../shared/types').Rule} */
|
|
module.exports = {
|
|
meta: {
|
|
type: "problem",
|
|
|
|
docs: {
|
|
description: "Disallow variable or `function` declarations in nested blocks",
|
|
recommended: true,
|
|
url: "https://eslint.org/docs/latest/rules/no-inner-declarations"
|
|
},
|
|
|
|
schema: [
|
|
{
|
|
enum: ["functions", "both"]
|
|
}
|
|
],
|
|
|
|
messages: {
|
|
moveDeclToRoot: "Move {{type}} declaration to {{body}} root."
|
|
}
|
|
},
|
|
|
|
create(context) {
|
|
|
|
/**
|
|
* Ensure that a given node is at a program or function body's root.
|
|
* @param {ASTNode} node Declaration node to check.
|
|
* @returns {void}
|
|
*/
|
|
function check(node) {
|
|
const parent = node.parent;
|
|
|
|
if (
|
|
parent.type === "BlockStatement" && validBlockStatementParent.has(parent.parent.type)
|
|
) {
|
|
return;
|
|
}
|
|
|
|
if (validParent.has(parent.type)) {
|
|
return;
|
|
}
|
|
|
|
context.report({
|
|
node,
|
|
messageId: "moveDeclToRoot",
|
|
data: {
|
|
type: (node.type === "FunctionDeclaration" ? "function" : "variable"),
|
|
body: getAllowedBodyDescription(node)
|
|
}
|
|
});
|
|
}
|
|
|
|
|
|
return {
|
|
|
|
FunctionDeclaration: check,
|
|
VariableDeclaration(node) {
|
|
if (context.options[0] === "both" && node.kind === "var") {
|
|
check(node);
|
|
}
|
|
}
|
|
|
|
};
|
|
|
|
}
|
|
};
|