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/**
* @fileoverview Prohibit the use of `let` as the loop variable
* in the initialization of for, and the left-hand
* iterator in forIn and forOf loops.
*
* @author Jessica Quynh Tran
*/
'use strict';
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
create(context) {
const msg = 'Use of `let` as the loop variable in a for-loop is ' +
'not recommended. Please use `var` instead.';
/**
* Report function to test if the for-loop is declared using `let`.
*/
function testForLoop(node) {
if (node.init && node.init.kind === 'let') {
context.report(node.init, msg);
}
}
/**
* Report function to test if the for-in or for-of loop
* is declared using `let`.
*/
function testForInOfLoop(node) {
if (node.left && node.left.kind === 'let') {
context.report(node.left, msg);
}
}
return {
'ForStatement': testForLoop,
'ForInStatement': testForInOfLoop,
'ForOfStatement': testForInOfLoop
};
}
};
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