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callback-return.js
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/**
* @author Jamund Ferguson
* See LICENSE file in root directory for full license.
*/
"use strict"
const RuleTester = require("#test-helpers").RuleTester
const rule = require("../../../lib/rules/callback-return")
const ruleTester = new RuleTester()
ruleTester.run("callback-return", rule, {
valid: [
// callbacks inside of functions should return
"function a(err) { if (err) return callback (err); }",
"function a(err) { if (err) return callback (err); callback(); }",
"function a(err) { if (err) { return callback (err); } callback(); }",
"function a(err) { if (err) { return /* confusing comment */ callback (err); } callback(); }",
"function x(err) { if (err) { callback(); return; } }",
"function x(err) { if (err) { \n log();\n callback(); return; } }",
"function x(err) { if (err) { callback(); return; } return callback(); }",
"function x(err) { if (err) { return callback(); } else { return callback(); } }",
"function x(err) { if (err) { return callback(); } else if (x) { return callback(); } }",
"function x(err) { if (err) return callback(); else return callback(); }",
"function x(cb) { cb && cb(); }",
"function x(next) { typeof next !== 'undefined' && next(); }",
"function x(next) { if (typeof next === 'function') { return next() } }",
"function x() { switch(x) { case 'a': return next(); } }",
"function x() { for(x = 0; x < 10; x++) { return next(); } }",
"function x() { while(x) { return next(); } }",
"function a(err) { if (err) { obj.method (err); } }",
// callback() all you want outside of a function
"callback()",
"callback(); callback();",
"while(x) { move(); }",
"for (var i = 0; i < 10; i++) { move(); }",
"for (var i = 0; i < 10; i++) move();",
"if (x) callback();",
"if (x) { callback(); }",
// arrow functions
{
code: "var x = err => { if (err) { callback(); return; } }",
},
{
code: "var x = err => callback(err)",
},
{
code: "var x = err => { setTimeout( () => { callback(); }); }",
},
// classes
{
code: "class x { horse() { callback(); } } ",
},
{
code: "class x { horse() { if (err) { return callback(); } callback(); } } ",
},
// options (only warns with the correct callback name)
{
code: "function a(err) { if (err) { callback(err) } }",
options: [["cb"]],
},
{
code: "function a(err) { if (err) { callback(err) } next(); }",
options: [["cb", "next"]],
},
{
code: "function a(err) { if (err) { return next(err) } else { callback(); } }",
options: [["cb", "next"]],
},
// allow object methods (https://github.com/eslint/eslint/issues/4711)
{
code: "function a(err) { if (err) { return obj.method(err); } }",
options: [["obj.method"]],
},
{
code: "function a(err) { if (err) { return obj.prop.method(err); } }",
options: [["obj.prop.method"]],
},
{
code: "function a(err) { if (err) { return obj.prop.method(err); } otherObj.prop.method() }",
options: [["obj.prop.method", "otherObj.prop.method"]],
},
{
code: "function a(err) { if (err) { callback(err); } }",
options: [["obj.method"]],
},
{
code: "function a(err) { if (err) { otherObj.method(err); } }",
options: [["obj.method"]],
},
{
code: "function a(err) { if (err) { //comment\nreturn obj.method(err); } }",
options: [["obj.method"]],
},
{
code: "function a(err) { if (err) { /*comment*/return obj.method(err); } }",
options: [["obj.method"]],
},
{
code: "function a(err) { if (err) { return obj.method(err); //comment\n } }",
options: [["obj.method"]],
},
{
code: "function a(err) { if (err) { return obj.method(err); /*comment*/ } }",
options: [["obj.method"]],
},
// only warns if object of MemberExpression is an Identifier
{
code: "function a(err) { if (err) { obj().method(err); } }",
options: [["obj().method"]],
},
{
code: "function a(err) { if (err) { obj.prop().method(err); } }",
options: [["obj.prop().method"]],
},
{
code: "function a(err) { if (err) { obj().prop.method(err); } }",
options: [["obj().prop.method"]],
},
// does not warn if object of MemberExpression is invoked
{
code: "function a(err) { if (err) { obj().method(err); } }",
options: [["obj.method"]],
},
{
code: "function a(err) { if (err) { obj().method(err); } obj.method(); }",
options: [["obj.method"]],
},
// known bad examples that we know we are ignoring
"function x(err) { if (err) { setTimeout(callback, 0); } callback(); }", // callback() called twice
"function x(err) { if (err) { process.nextTick(function(err) { callback(); }); } callback(); }", // callback() called twice
],
invalid: [
{
code: "function a(err) { if (err) { callback (err); } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 30,
type: "CallExpression",
},
],
},
{
code: "function a(callback) { if (typeof callback !== 'undefined') { callback(); } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 63,
type: "CallExpression",
},
],
},
{
code: "function a(callback) { if (typeof callback !== 'undefined') callback(); }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 61,
type: "CallExpression",
},
],
},
{
code: "function a(callback) { if (err) { callback(); horse && horse(); } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 35,
type: "CallExpression",
},
],
},
{
code: "var x = (err) => { if (err) { callback (err); } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 31,
type: "CallExpression",
},
],
},
{
code: "var x = { x(err) { if (err) { callback (err); } } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 31,
type: "CallExpression",
},
],
},
{
code: "function x(err) { if (err) {\n log();\n callback(err); } }",
errors: [
{
messageId: "missingReturn",
line: 3,
column: 2,
type: "CallExpression",
},
],
},
{
code: "var x = { x(err) { if (err) { callback && callback (err); } } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 43,
type: "CallExpression",
},
],
},
{
code: "function a(err) { callback (err); callback(); }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 19,
type: "CallExpression",
},
],
},
{
code: "function a(err) { callback (err); horse(); }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 19,
type: "CallExpression",
},
],
},
{
code: "function a(err) { if (err) { callback (err); horse(); return; } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 30,
type: "CallExpression",
},
],
},
{
code: "var a = (err) => { callback (err); callback(); }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 20,
type: "CallExpression",
},
],
},
{
code: "function a(err) { if (err) { callback (err); } else if (x) { callback(err); return; } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 30,
type: "CallExpression",
},
],
},
{
code: "function x(err) { if (err) { return callback(); }\nelse if (abc) {\ncallback(); }\nelse {\nreturn callback(); } }",
errors: [
{
messageId: "missingReturn",
line: 3,
column: 1,
type: "CallExpression",
},
],
},
{
code: "class x { horse() { if (err) { callback(); } callback(); } } ",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 32,
type: "CallExpression",
},
],
},
// generally good behavior which we must not allow to keep the rule simple
{
code: "function x(err) { if (err) { callback() } else { callback() } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 30,
type: "CallExpression",
},
{
messageId: "missingReturn",
line: 1,
column: 50,
type: "CallExpression",
},
],
},
{
code: "function x(err) { if (err) return callback(); else callback(); }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 52,
type: "CallExpression",
},
],
},
{
code: "() => { if (x) { callback(); } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 18,
type: "CallExpression",
},
],
},
{
code: "function b() { switch(x) { case 'horse': callback(); } }",
errors: [
{
messageId: "missingReturn",
line: 1,
column: 42,
type: "CallExpression",
},
],
},
{
code: "function a() { switch(x) { case 'horse': move(); } }",
options: [["move"]],
errors: [
{
messageId: "missingReturn",
line: 1,
column: 42,
type: "CallExpression",
},
],
},
// loops
{
code: "var x = function() { while(x) { move(); } }",
options: [["move"]],
errors: [
{
messageId: "missingReturn",
line: 1,
column: 33,
type: "CallExpression",
},
],
},
{
code: "function x() { for (var i = 0; i < 10; i++) { move(); } }",
options: [["move"]],
errors: [
{
messageId: "missingReturn",
line: 1,
column: 47,
type: "CallExpression",
},
],
},
{
code: "var x = function() { for (var i = 0; i < 10; i++) move(); }",
options: [["move"]],
errors: [
{
messageId: "missingReturn",
line: 1,
column: 51,
type: "CallExpression",
},
],
},
{
code: "function a(err) { if (err) { obj.method(err); } }",
options: [["obj.method"]],
errors: [
{
messageId: "missingReturn",
line: 1,
column: 30,
type: "CallExpression",
},
],
},
{
code: "function a(err) { if (err) { obj.prop.method(err); } }",
options: [["obj.prop.method"]],
errors: [
{
messageId: "missingReturn",
line: 1,
column: 30,
type: "CallExpression",
},
],
},
{
code: "function a(err) { if (err) { obj.prop.method(err); } otherObj.prop.method() }",
options: [["obj.prop.method", "otherObj.prop.method"]],
errors: [
{
messageId: "missingReturn",
line: 1,
column: 30,
type: "CallExpression",
},
],
},
{
code: "function a(err) { if (err) { /*comment*/obj.method(err); } }",
options: [["obj.method"]],
errors: [
{
messageId: "missingReturn",
line: 1,
column: 41,
type: "CallExpression",
},
],
},
{
code: "function a(err) { if (err) { //comment\nobj.method(err); } }",
options: [["obj.method"]],
errors: [
{
messageId: "missingReturn",
line: 2,
column: 1,
type: "CallExpression",
},
],
},
{
code: "function a(err) { if (err) { obj.method(err); /*comment*/ } }",
options: [["obj.method"]],
errors: [
{
messageId: "missingReturn",
line: 1,
column: 30,
type: "CallExpression",
},
],
},
{
code: "function a(err) { if (err) { obj.method(err); //comment\n } }",
options: [["obj.method"]],
errors: [
{
messageId: "missingReturn",
line: 1,
column: 30,
type: "CallExpression",
},
],
},
],
})