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array-callback-return.js
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array-callback-return.js
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/**
* @fileoverview Tests for array-callback-return rule.
* @author Toru Nagashima
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/array-callback-return"),
{ RuleTester } = require("../../../lib/rule-tester");
const ruleTester = new RuleTester();
const allowImplicitOptions = [{ allowImplicit: true }];
const checkForEachOptions = [{ checkForEach: true }];
const allowImplicitCheckForEach = [{ allowImplicit: true, checkForEach: true }];
ruleTester.run("array-callback-return", rule, {
valid: [
"foo.every(function(){}())",
"foo.every(function(){ return function() { return true; }; }())",
"foo.every(function(){ return function() { return; }; })",
"foo.forEach(bar || function(x) { var a=0; })",
"foo.forEach(bar || function(x) { return a; })",
"foo.forEach(function() {return function() { var a = 0;}}())",
"foo.forEach(function(x) { var a=0; })",
"foo.forEach(function(x) { return a;})",
"foo.forEach(function(x) { return; })",
"foo.forEach(function(x) { if (a === b) { return;} var a=0; })",
"foo.forEach(function(x) { if (a === b) { return x;} var a=0; })",
"foo.bar().forEach(function(x) { return; })",
"[\"foo\",\"bar\",\"baz\"].forEach(function(x) { return x; })",
{ code: "foo.forEach(x => { var a=0; })", parserOptions: { ecmaVersion: 6 } },
{ code: "foo.forEach(x => { if (a === b) { return;} var a=0; })", parserOptions: { ecmaVersion: 6 } },
{ code: "foo.forEach(x => x)", parserOptions: { ecmaVersion: 6 } },
{ code: "foo.forEach(val => y += val)", parserOptions: { ecmaVersion: 6 } },
{ code: "foo.map(async function(){})", parserOptions: { ecmaVersion: 8 } },
{ code: "foo.map(async () => {})", parserOptions: { ecmaVersion: 8 } },
{ code: "foo.map(function* () {})", parserOptions: { ecmaVersion: 6 } },
// options: { allowImplicit: false }
{ code: "Array.from(x, function() { return true; })", options: [{ allowImplicit: false }] },
{ code: "Int32Array.from(x, function() { return true; })", options: [{ allowImplicit: false }] },
"foo.every(function() { return true; })",
"foo.filter(function() { return true; })",
"foo.find(function() { return true; })",
"foo.findIndex(function() { return true; })",
"foo.flatMap(function() { return true; })",
"foo.forEach(function() { return; })",
"foo.map(function() { return true; })",
"foo.reduce(function() { return true; })",
"foo.reduceRight(function() { return true; })",
"foo.some(function() { return true; })",
"foo.sort(function() { return 0; })",
{ code: "foo.every(() => { return true; })", parserOptions: { ecmaVersion: 6 } },
"foo.every(function() { if (a) return true; else return false; })",
"foo.every(function() { switch (a) { case 0: bar(); default: return true; } })",
"foo.every(function() { try { bar(); return true; } catch (err) { return false; } })",
"foo.every(function() { try { bar(); } finally { return true; } })",
// options: { allowImplicit: true }
{ code: "Array.from(x, function() { return; })", options: allowImplicitOptions },
{ code: "Int32Array.from(x, function() { return; })", options: allowImplicitOptions },
{ code: "foo.every(function() { return; })", options: allowImplicitOptions },
{ code: "foo.filter(function() { return; })", options: allowImplicitOptions },
{ code: "foo.find(function() { return; })", options: allowImplicitOptions },
{ code: "foo.findIndex(function() { return; })", options: allowImplicitOptions },
{ code: "foo.flatMap(function() { return; })", options: allowImplicitOptions },
{ code: "foo.forEach(function() { return; })", options: allowImplicitOptions },
{ code: "foo.map(function() { return; })", options: allowImplicitOptions },
{ code: "foo.reduce(function() { return; })", options: allowImplicitOptions },
{ code: "foo.reduceRight(function() { return; })", options: allowImplicitOptions },
{ code: "foo.some(function() { return; })", options: allowImplicitOptions },
{ code: "foo.sort(function() { return; })", options: allowImplicitOptions },
{ code: "foo.every(() => { return; })", options: allowImplicitOptions, parserOptions: { ecmaVersion: 6 } },
{ code: "foo.every(function() { if (a) return; else return a; })", options: allowImplicitOptions },
{ code: "foo.every(function() { switch (a) { case 0: bar(); default: return; } })", options: allowImplicitOptions },
{ code: "foo.every(function() { try { bar(); return; } catch (err) { return; } })", options: allowImplicitOptions },
{ code: "foo.every(function() { try { bar(); } finally { return; } })", options: allowImplicitOptions },
// options: { checkForEach: true }
{ code: "foo.forEach(function(x) { return; })", options: checkForEachOptions },
{ code: "foo.forEach(function(x) { var a=0; })", options: checkForEachOptions },
{ code: "foo.forEach(function(x) { if (a === b) { return;} var a=0; })", options: checkForEachOptions },
{ code: "foo.forEach(function() {return function() { if (a == b) { return; }}}())", options: checkForEachOptions },
{ code: "foo.forEach(x => { var a=0; })", options: checkForEachOptions, parserOptions: { ecmaVersion: 6 } },
{ code: "foo.forEach(x => { if (a === b) { return;} var a=0; })", options: checkForEachOptions, parserOptions: { ecmaVersion: 6 } },
{ code: "foo.forEach(x => { x })", options: checkForEachOptions, parserOptions: { ecmaVersion: 6 } },
{ code: "foo.forEach(bar || function(x) { return; })", options: checkForEachOptions },
{ code: "Array.from(x, function() { return true; })", options: checkForEachOptions },
{ code: "Int32Array.from(x, function() { return true; })", options: checkForEachOptions },
{ code: "foo.every(() => { return true; })", options: checkForEachOptions, parserOptions: { ecmaVersion: 6 } },
{ code: "foo.every(function() { if (a) return 1; else return a; })", options: checkForEachOptions },
{ code: "foo.every(function() { switch (a) { case 0: return bar(); default: return a; } })", options: checkForEachOptions },
{ code: "foo.every(function() { try { bar(); return 1; } catch (err) { return err; } })", options: checkForEachOptions },
{ code: "foo.every(function() { try { bar(); } finally { return 1; } })", options: checkForEachOptions },
{ code: "foo.every(function() { return; })", options: allowImplicitCheckForEach },
"Arrow.from(x, function() {})",
"foo.abc(function() {})",
"every(function() {})",
"foo[every](function() {})",
"var every = function() {}",
{ code: "foo[`${every}`](function() {})", parserOptions: { ecmaVersion: 6 } },
{ code: "foo.every(() => true)", parserOptions: { ecmaVersion: 6 } }
],
invalid: [
{ code: "Array.from(x, function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "Array.from(x, function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "Int32Array.from(x, function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "Int32Array.from(x, function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.every(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.every(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.filter(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.filter(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.find(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.find(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.findIndex(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.findIndex(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.flatMap(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.flatMap(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.map(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.map(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.reduce(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.reduce(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.reduceRight(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.reduceRight(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.some(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.some(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.sort(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.sort(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.bar.baz.every(function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.bar.baz.every(function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo[\"every\"](function() {})", errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo[\"every\"](function foo() {})", errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo[`every`](function() {})", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo[`every`](function foo() {})", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.every(() => {})", parserOptions: { ecmaVersion: 6 }, errors: [{ message: "Expected to return a value in arrow function.", column: 14 }] },
{ code: "foo.every(function() { if (a) return true; })", errors: [{ message: "Expected to return a value at the end of function.", column: 11 }] },
{ code: "foo.every(function cb() { if (a) return true; })", errors: [{ message: "Expected to return a value at the end of function 'cb'.", column: 11 }] },
{ code: "foo.every(function() { switch (a) { case 0: break; default: return true; } })", errors: [{ messageId: "expectedAtEnd", data: { name: "function" } }] },
{ code: "foo.every(function foo() { switch (a) { case 0: break; default: return true; } })", errors: [{ messageId: "expectedAtEnd", data: { name: "function 'foo'" } }] },
{ code: "foo.every(function() { try { bar(); } catch (err) { return true; } })", errors: [{ messageId: "expectedAtEnd", data: { name: "function" } }] },
{ code: "foo.every(function foo() { try { bar(); } catch (err) { return true; } })", errors: [{ messageId: "expectedAtEnd", data: { name: "function 'foo'" } }] },
{ code: "foo.every(function() { return; })", errors: [{ messageId: "expectedReturnValue", data: { name: "Function" } }] },
{ code: "foo.every(function foo() { return; })", errors: [{ messageId: "expectedReturnValue", data: { name: "Function 'foo'" } }] },
{ code: "foo.every(function() { if (a) return; })", errors: ["Expected to return a value at the end of function.", { messageId: "expectedReturnValue", data: { name: "Function" } }] },
{ code: "foo.every(function foo() { if (a) return; })", errors: ["Expected to return a value at the end of function 'foo'.", { messageId: "expectedReturnValue", data: { name: "Function 'foo'" } }] },
{ code: "foo.every(function() { if (a) return; else return; })", errors: [{ messageId: "expectedReturnValue", data: { name: "Function" } }, { messageId: "expectedReturnValue", data: { name: "Function" } }] },
{ code: "foo.every(function foo() { if (a) return; else return; })", errors: [{ messageId: "expectedReturnValue", data: { name: "Function 'foo'" } }, { messageId: "expectedReturnValue", data: { name: "Function 'foo'" } }] },
{ code: "foo.every(cb || function() {})", errors: ["Expected to return a value in function."] },
{ code: "foo.every(cb || function foo() {})", errors: ["Expected to return a value in function 'foo'."] },
{ code: "foo.every(a ? function() {} : function() {})", errors: ["Expected to return a value in function.", "Expected to return a value in function."] },
{ code: "foo.every(a ? function foo() {} : function bar() {})", errors: ["Expected to return a value in function 'foo'.", "Expected to return a value in function 'bar'."] },
{ code: "foo.every(function(){ return function() {}; }())", errors: [{ message: "Expected to return a value in function.", column: 30 }] },
{ code: "foo.every(function(){ return function foo() {}; }())", errors: [{ message: "Expected to return a value in function 'foo'.", column: 30 }] },
{ code: "foo.every(() => {})", options: [{ allowImplicit: false }], parserOptions: { ecmaVersion: 6 }, errors: [{ message: "Expected to return a value in arrow function." }] },
{ code: "foo.every(() => {})", options: [{ allowImplicit: true }], parserOptions: { ecmaVersion: 6 }, errors: [{ message: "Expected to return a value in arrow function." }] },
// options: { allowImplicit: true }
{ code: "Array.from(x, function() {})", options: allowImplicitOptions, errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.every(function() {})", options: allowImplicitOptions, errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.filter(function foo() {})", options: allowImplicitOptions, errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.find(function foo() {})", options: allowImplicitOptions, errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.map(function() {})", options: allowImplicitOptions, errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.reduce(function() {})", options: allowImplicitOptions, errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.reduceRight(function() {})", options: allowImplicitOptions, errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.bar.baz.every(function foo() {})", options: allowImplicitOptions, errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.every(cb || function() {})", options: allowImplicitOptions, errors: ["Expected to return a value in function."] },
{ code: "[\"foo\",\"bar\"].sort(function foo() {})", options: allowImplicitOptions, errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.forEach(x => x)", options: allowImplicitCheckForEach, parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Arrow function" } }] },
{ code: "foo.forEach(function(x) { if (a == b) {return x;}})", options: allowImplicitCheckForEach, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Function" } }] },
{ code: "foo.forEach(function bar(x) { return x;})", options: allowImplicitCheckForEach, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Function 'bar'" } }] },
// // options: { checkForEach: true }
{ code: "foo.forEach(x => x)", options: checkForEachOptions, parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Arrow function" } }] },
{ code: "foo.forEach(val => y += val)", options: checkForEachOptions, parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Arrow function" } }] },
{ code: "[\"foo\",\"bar\"].forEach(x => ++x)", options: checkForEachOptions, parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Arrow function" } }] },
{ code: "foo.bar().forEach(x => x === y)", options: checkForEachOptions, parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Arrow function" } }] },
{ code: "foo.forEach(function() {return function() { if (a == b) { return a; }}}())", options: checkForEachOptions, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Function" } }] },
{ code: "foo.forEach(function(x) { if (a == b) {return x;}})", options: checkForEachOptions, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Function" } }] },
{ code: "foo.forEach(function(x) { if (a == b) {return undefined;}})", options: checkForEachOptions, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Function" } }] },
{ code: "foo.forEach(function bar(x) { return x;})", options: checkForEachOptions, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Function 'bar'" } }] },
{ code: "foo.bar().forEach(function bar(x) { return x;})", options: checkForEachOptions, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Function 'bar'" } }] },
{ code: "[\"foo\",\"bar\"].forEach(function bar(x) { return x;})", options: checkForEachOptions, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Function 'bar'" } }] },
{ code: "foo.forEach((x) => { return x;})", options: checkForEachOptions, parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "expectedNoReturnValue", data: { name: "Arrow function" } }] },
{ code: "Array.from(x, function() {})", options: checkForEachOptions, errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.every(function() {})", options: checkForEachOptions, errors: [{ messageId: "expectedInside", data: { name: "function" } }] },
{ code: "foo.filter(function foo() {})", options: checkForEachOptions, errors: [{ messageId: "expectedInside", data: { name: "function 'foo'" } }] },
{ code: "foo.filter(function foo() { return; })", options: checkForEachOptions, errors: [{ messageId: "expectedReturnValue", data: { name: "Function 'foo'" } }] },
{ code: "foo.every(cb || function() {})", options: checkForEachOptions, errors: ["Expected to return a value in function."] },
// full location tests
{
code: "foo.filter(bar => { baz(); } )",
parserOptions: { ecmaVersion: 6 },
errors: [{
messageId: "expectedInside",
data: { name: "arrow function" },
type: "ArrowFunctionExpression",
line: 1,
column: 16,
endLine: 1,
endColumn: 18
}]
},
{
code: "foo.filter(\n() => {} )",
parserOptions: { ecmaVersion: 6 },
errors: [{
messageId: "expectedInside",
data: { name: "arrow function" },
type: "ArrowFunctionExpression",
line: 2,
column: 4,
endLine: 2,
endColumn: 6
}]
},
{
code: "foo.filter(bar || ((baz) => {}) )",
parserOptions: { ecmaVersion: 6 },
errors: [{
messageId: "expectedInside",
data: { name: "arrow function" },
type: "ArrowFunctionExpression",
line: 1,
column: 26,
endLine: 1,
endColumn: 28
}]
},
{
code: "foo.filter(bar => { return; })",
parserOptions: { ecmaVersion: 6 },
errors: [{
messageId: "expectedReturnValue",
data: { name: "Arrow function" },
type: "ReturnStatement",
line: 1,
column: 21,
endLine: 1,
endColumn: 28
}]
},
{
code: "Array.from(foo, bar => { bar })",
parserOptions: { ecmaVersion: 6 },
errors: [{
messageId: "expectedInside",
data: { name: "arrow function" },
type: "ArrowFunctionExpression",
line: 1,
column: 21,
endLine: 1,
endColumn: 23
}]
},
{
code: "foo.forEach(bar => bar)",
options: checkForEachOptions,
parserOptions: { ecmaVersion: 6 },
errors: [{
messageId: "expectedNoReturnValue",
data: { name: "Arrow function" },
type: "ArrowFunctionExpression",
line: 1,
column: 17,
endLine: 1,
endColumn: 19
}]
},
{
code: "foo.forEach((function () { return (bar) => bar; })())",
options: checkForEachOptions,
parserOptions: { ecmaVersion: 6 },
errors: [{
messageId: "expectedNoReturnValue",
data: { name: "Arrow function" },
type: "ArrowFunctionExpression",
line: 1,
column: 41,
endLine: 1,
endColumn: 43
}]
},
{
code: "foo.forEach((() => {\n return bar => bar; })())",
options: checkForEachOptions,
parserOptions: { ecmaVersion: 6 },
errors: [{
messageId: "expectedNoReturnValue",
data: { name: "Arrow function" },
type: "ArrowFunctionExpression",
line: 2,
column: 13,
endLine: 2,
endColumn: 15
}]
},
{
code: "foo.forEach((bar) => { if (bar) { return; } else { return bar ; } })",
options: checkForEachOptions,
parserOptions: { ecmaVersion: 6 },
errors: [{
messageId: "expectedNoReturnValue",
data: { name: "Arrow function" },
type: "ReturnStatement",
line: 1,
column: 52,
endLine: 1,
endColumn: 64
}]
},
{
code: "foo.filter(function(){})",
errors: [{
messageId: "expectedInside",
data: { name: "function" },
type: "FunctionExpression",
line: 1,
column: 12,
endLine: 1,
endColumn: 20
}]
},
{
code: "foo.filter(function (){})",
errors: [{
messageId: "expectedInside",
data: { name: "function" },
type: "FunctionExpression",
line: 1,
column: 12,
endLine: 1,
endColumn: 21
}]
},
{
code: "foo.filter(function\n(){})",
errors: [{
messageId: "expectedInside",
data: { name: "function" },
type: "FunctionExpression",
line: 1,
column: 12,
endLine: 2,
endColumn: 1
}]
},
{
code: "foo.filter(function bar(){})",
errors: [{
messageId: "expectedInside",
data: { name: "function 'bar'" },
type: "FunctionExpression",
line: 1,
column: 12,
endLine: 1,
endColumn: 24
}]
},
{
code: "foo.filter(function bar (){})",
errors: [{
messageId: "expectedInside",
data: { name: "function 'bar'" },
type: "FunctionExpression",
line: 1,
column: 12,
endLine: 1,
endColumn: 26
}]
},
{
code: "foo.filter(function\n bar() {})",
errors: [{
messageId: "expectedInside",
data: { name: "function 'bar'" },
type: "FunctionExpression",
line: 1,
column: 12,
endLine: 2,
endColumn: 5
}]
},
{
code: "Array.from(foo, function bar(){})",
errors: [{
messageId: "expectedInside",
data: { name: "function 'bar'" },
type: "FunctionExpression",
line: 1,
column: 17,
endLine: 1,
endColumn: 29
}]
},
{
code: "Array.from(foo, bar ? function (){} : baz)",
errors: [{
messageId: "expectedInside",
data: { name: "function" },
type: "FunctionExpression",
line: 1,
column: 23,
endLine: 1,
endColumn: 32
}]
},
{
code: "foo.filter(function bar() { return \n })",
errors: [{
messageId: "expectedReturnValue",
data: { name: "Function 'bar'" },
type: "ReturnStatement",
line: 1,
column: 29,
endLine: 1,
endColumn: 35
}]
},
{
code: "foo.forEach(function () { \nif (baz) return bar\nelse return\n })",
options: checkForEachOptions,
errors: [{
messageId: "expectedNoReturnValue",
data: { name: "Function" },
type: "ReturnStatement",
line: 2,
column: 10,
endLine: 2,
endColumn: 20
}]
}
]
});