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/
no-param-reassign.js
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/
no-param-reassign.js
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/**
* @fileoverview Disallow reassignment of function parameters.
* @author Nat Burns
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-param-reassign"),
RuleTester = require("../../../lib/testers/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
ruleTester.run("no-param-reassign", rule, {
valid: [
"function foo(a) { var b = a; }",
"function foo(a) { a.prop = 'value'; }",
"function foo(a) { (function() { var a = 12; a++; })(); }",
"function foo() { someGlobal = 13; }",
{ code: "function foo() { someGlobal = 13; }", globals: { someGlobal: false } },
"function foo(a) { a.b = 0; }",
"function foo(a) { delete a.b; }",
"function foo(a) { ++a.b; }",
{ code: "function foo(a) { [a.b] = []; }", parserOptions: { ecmaVersion: 6 } },
{ code: "function foo(a) { bar(a.b).c = 0; }", options: [{ props: true }] },
{ code: "function foo(a) { data[a.b] = 0; }", options: [{ props: true }] },
{ code: "function foo(a) { +a.b; }", options: [{ props: true }] },
{ code: "function foo(a) { (a ? [] : [])[0] = 1; }", options: [{ props: true }] },
{ code: "function foo(a) { (a.b ? [] : [])[0] = 1; }", options: [{ props: true }] },
{ code: "function foo(a) { a.b = 0; }", options: [{ props: true, ignorePropertyModificationsFor: ["a"] }] },
{ code: "function foo(a) { ++a.b; }", options: [{ props: true, ignorePropertyModificationsFor: ["a"] }] },
{ code: "function foo(a) { delete a.b; }", options: [{ props: true, ignorePropertyModificationsFor: ["a"] }] },
{ code: "function foo(a, z) { a.b = 0; x.y = 0; }", options: [{ props: true, ignorePropertyModificationsFor: ["a", "x"] }] },
{ code: "function foo(a) { a.b.c = 0;}", options: [{ props: true, ignorePropertyModificationsFor: ["a"] }] },
{ code: "function foo(aFoo) { aFoo.b = 0; }", options: [{ props: true, ignorePropertyModificationsForRegex: ["^a.*$"] }] },
{ code: "function foo(aFoo) { ++aFoo.b; }", options: [{ props: true, ignorePropertyModificationsForRegex: ["^a.*$"] }] },
{ code: "function foo(aFoo) { delete aFoo.b; }", options: [{ props: true, ignorePropertyModificationsForRegex: ["^a.*$"] }] },
{ code: "function foo(a, z) { aFoo.b = 0; x.y = 0; }", options: [{ props: true, ignorePropertyModificationsForRegex: ["^a.*$", "^x.*$"] }] },
{ code: "function foo(aFoo) { aFoo.b.c = 0;}", options: [{ props: true, ignorePropertyModificationsForRegex: ["^a.*$"] }] },
{
code: "function foo(a) { ({ [a]: variable } = value) }",
options: [{ props: true }],
parserOptions: { ecmaVersion: 6 }
},
{
code: "function foo(a) { ([...a.b] = obj); }",
options: [{ props: false }],
parserOptions: { ecmaVersion: 2015 }
},
{
code: "function foo(a) { ({...a.b} = obj); }",
options: [{ props: false }],
parserOptions: { ecmaVersion: 2018 }
}
],
invalid: [
{ code: "function foo(bar) { bar = 13; }", errors: [{ message: "Assignment to function parameter 'bar'." }] },
{ code: "function foo(bar) { bar += 13; }", errors: [{ message: "Assignment to function parameter 'bar'." }] },
{ code: "function foo(bar) { (function() { bar = 13; })(); }", errors: [{ message: "Assignment to function parameter 'bar'." }] },
{ code: "function foo(bar) { ++bar; }", errors: [{ message: "Assignment to function parameter 'bar'." }] },
{ code: "function foo(bar) { bar++; }", errors: [{ message: "Assignment to function parameter 'bar'." }] },
{ code: "function foo(bar) { --bar; }", errors: [{ message: "Assignment to function parameter 'bar'." }] },
{ code: "function foo(bar) { bar--; }", errors: [{ message: "Assignment to function parameter 'bar'." }] },
{ code: "function foo({bar}) { bar = 13; }", parserOptions: { ecmaVersion: 6 }, errors: [{ message: "Assignment to function parameter 'bar'." }] },
{ code: "function foo([, {bar}]) { bar = 13; }", parserOptions: { ecmaVersion: 6 }, errors: [{ message: "Assignment to function parameter 'bar'." }] },
{ code: "function foo(bar) { ({bar} = {}); }", parserOptions: { ecmaVersion: 6 }, errors: [{ message: "Assignment to function parameter 'bar'." }] },
{ code: "function foo(bar) { ({x: [, bar = 0]} = {}); }", parserOptions: { ecmaVersion: 6 }, errors: [{ message: "Assignment to function parameter 'bar'." }] },
{
code: "function foo(bar) { bar.a = 0; }",
options: [{ props: true }],
errors: [{ message: "Assignment to property of function parameter 'bar'." }]
},
{
code: "function foo(bar) { bar.get(0).a = 0; }",
options: [{ props: true }],
errors: [{ message: "Assignment to property of function parameter 'bar'." }]
},
{
code: "function foo(bar) { delete bar.a; }",
options: [{ props: true }],
errors: [{ message: "Assignment to property of function parameter 'bar'." }]
},
{
code: "function foo(bar) { ++bar.a; }",
options: [{ props: true }],
errors: [{ message: "Assignment to property of function parameter 'bar'." }]
},
{
code: "function foo(bar) { (bar ? bar : [])[0] = 1; }",
options: [{ props: true }],
errors: [{ message: "Assignment to property of function parameter 'bar'." }]
},
{
code: "function foo(bar) { [bar.a] = []; }",
options: [{ props: true }],
parserOptions: { ecmaVersion: 6 },
errors: [{ message: "Assignment to property of function parameter 'bar'." }]
},
{
code: "function foo(bar) { [bar.a] = []; }",
options: [{ props: true, ignorePropertyModificationsFor: ["a"] }],
parserOptions: { ecmaVersion: 6 },
errors: [{ message: "Assignment to property of function parameter 'bar'." }]
},
{
code: "function foo(bar) { [bar.a] = []; }",
options: [{ props: true, ignorePropertyModificationsForRegex: ["^a.*$"] }],
parserOptions: { ecmaVersion: 6 },
errors: [{ message: "Assignment to property of function parameter 'bar'." }]
},
{
code: "function foo(bar) { [bar.a] = []; }",
options: [{ props: true, ignorePropertyModificationsForRegex: ["^B.*$"] }],
parserOptions: { ecmaVersion: 6 },
errors: [{ message: "Assignment to property of function parameter 'bar'." }]
},
{
code: "function foo(bar) { ({foo: bar.a} = {}); }",
options: [{ props: true }],
parserOptions: { ecmaVersion: 6 },
errors: [{ message: "Assignment to property of function parameter 'bar'." }]
},
{
code: "function foo(a) { ({a} = obj); }",
options: [{ props: true }],
parserOptions: { ecmaVersion: 6 },
errors: [{ message: "Assignment to function parameter 'a'." }]
},
{
code: "function foo(a) { ([...a] = obj); }",
parserOptions: { ecmaVersion: 2015 },
errors: [{ message: "Assignment to function parameter 'a'." }]
},
{
code: "function foo(a) { ({...a} = obj); }",
parserOptions: { ecmaVersion: 2018 },
errors: [{ message: "Assignment to function parameter 'a'." }]
},
{
code: "function foo(a) { ([...a.b] = obj); }",
options: [{ props: true }],
parserOptions: { ecmaVersion: 2015 },
errors: [{ message: "Assignment to property of function parameter 'a'." }]
},
{
code: "function foo(a) { ({...a.b} = obj); }",
options: [{ props: true }],
parserOptions: { ecmaVersion: 2018 },
errors: [{ message: "Assignment to property of function parameter 'a'." }]
}
]
});