81 lines
2.3 KiB
JavaScript
81 lines
2.3 KiB
JavaScript
/**
|
|
* @author Jamund Ferguson
|
|
* See LICENSE file in root directory for full license.
|
|
*/
|
|
"use strict"
|
|
|
|
module.exports = {
|
|
meta: {
|
|
docs: {
|
|
description:
|
|
"ensure Node.js-style error-first callback pattern is followed",
|
|
category: "Possible Errors",
|
|
recommended: false,
|
|
url: "https://github.com/weiran-zsd/eslint-plugin-node/blob/HEAD/docs/rules/no-callback-literal.md",
|
|
},
|
|
type: "problem",
|
|
fixable: null,
|
|
schema: [],
|
|
},
|
|
|
|
create(context) {
|
|
const callbackNames = ["callback", "cb"]
|
|
|
|
function isCallback(name) {
|
|
return callbackNames.indexOf(name) > -1
|
|
}
|
|
|
|
return {
|
|
CallExpression(node) {
|
|
const errorArg = node.arguments[0]
|
|
const calleeName = node.callee.name
|
|
|
|
if (
|
|
errorArg &&
|
|
!couldBeError(errorArg) &&
|
|
isCallback(calleeName)
|
|
) {
|
|
context.report({
|
|
node,
|
|
message:
|
|
"Unexpected literal in error position of callback.",
|
|
})
|
|
}
|
|
},
|
|
}
|
|
},
|
|
}
|
|
|
|
/**
|
|
* Determine if a node has a possiblity to be an Error object
|
|
* @param {ASTNode} node ASTNode to check
|
|
* @returns {boolean} True if there is a chance it contains an Error obj
|
|
*/
|
|
function couldBeError(node) {
|
|
switch (node.type) {
|
|
case "Identifier":
|
|
case "CallExpression":
|
|
case "NewExpression":
|
|
case "MemberExpression":
|
|
case "TaggedTemplateExpression":
|
|
case "YieldExpression":
|
|
return true // possibly an error object.
|
|
|
|
case "AssignmentExpression":
|
|
return couldBeError(node.right)
|
|
|
|
case "SequenceExpression": {
|
|
const exprs = node.expressions
|
|
return exprs.length !== 0 && couldBeError(exprs[exprs.length - 1])
|
|
}
|
|
|
|
case "LogicalExpression":
|
|
return couldBeError(node.left) || couldBeError(node.right)
|
|
|
|
case "ConditionalExpression":
|
|
return couldBeError(node.consequent) || couldBeError(node.alternate)
|
|
|
|
default:
|
|
return node.value === null
|
|
}
|
|
}
|