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prefer-object-has-own.js
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prefer-object-has-own.js
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/**
* @fileoverview Prefers Object.hasOwn instead of Object.prototype.hasOwnProperty
* @author Nitin Kumar, Gautam Arora
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/prefer-object-has-own");
const { RuleTester } = require("../../../lib/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const parserOptions = {
ecmaVersion: 2022
};
const ruleTester = new RuleTester({ parserOptions });
ruleTester.run("prefer-object-has-own", rule, {
valid: [
"Object",
"Object(obj, prop)",
"Object.hasOwnProperty",
"Object.hasOwnProperty(prop)",
"foo.hasOwnProperty(prop)",
"foo.hasOwnProperty(obj, prop)",
"Object.hasOwnProperty.call",
"foo.Object.hasOwnProperty.call(obj, prop)",
"foo.hasOwnProperty.call(obj, prop)",
"foo.call(Object.prototype.hasOwnProperty, Object.prototype.hasOwnProperty.call)",
"Object.foo.call(obj, prop)",
"Object.hasOwnProperty.foo(obj, prop)",
"Object.hasOwnProperty.call.foo(obj, prop)",
"Object[hasOwnProperty].call(obj, prop)",
"Object.hasOwnProperty[call](obj, prop)",
"class C { #hasOwnProperty; foo() { Object.#hasOwnProperty.call(obj, prop) } }",
"class C { #call; foo() { Object.hasOwnProperty.#call(obj, prop) } }",
"(Object) => Object.hasOwnProperty.call(obj, prop)", // not global Object
"Object.prototype",
"Object.prototype(obj, prop)",
"Object.prototype.hasOwnProperty",
"Object.prototype.hasOwnProperty(obj, prop)",
"Object.prototype.hasOwnProperty.call",
"foo.Object.prototype.hasOwnProperty.call(obj, prop)",
"foo.prototype.hasOwnProperty.call(obj, prop)",
"Object.foo.hasOwnProperty.call(obj, prop)",
"Object.prototype.foo.call(obj, prop)",
"Object.prototype.hasOwnProperty.foo(obj, prop)",
"Object.prototype.hasOwnProperty.call.foo(obj, prop)",
"Object.prototype[hasOwnProperty].call(obj, prop)",
"Object.prototype.hasOwnProperty[call](obj, prop)",
"class C { #hasOwnProperty; foo() { Object.prototype.#hasOwnProperty.call(obj, prop) } }",
"class C { #call; foo() { Object.prototype.hasOwnProperty.#call(obj, prop) } }",
"Object[prototype].hasOwnProperty.call(obj, prop)",
"class C { #prototype; foo() { Object.#prototype.hasOwnProperty.call(obj, prop) } }",
"(Object) => Object.prototype.hasOwnProperty.call(obj, prop)", // not global Object
"({})",
"({}(obj, prop))",
"({}.hasOwnProperty)",
"({}.hasOwnProperty(prop))",
"({}.hasOwnProperty(obj, prop))",
"({}.hasOwnProperty.call)",
"({}.foo.call(obj, prop))",
"({}.hasOwnProperty.foo(obj, prop))",
"({}[hasOwnProperty].call(obj, prop))",
"({}.hasOwnProperty[call](obj, prop))",
"({}).hasOwnProperty[call](object, property)",
"({})[hasOwnProperty].call(object, property)",
"class C { #hasOwnProperty; foo() { ({}.#hasOwnProperty.call(obj, prop)) } }",
"class C { #call; foo() { ({}.hasOwnProperty.#call(obj, prop)) } }",
"({ foo }.hasOwnProperty.call(obj, prop))", // object literal should be empty
`
let obj = {};
Object.hasOwn(obj,"");
`,
"const hasProperty = Object.hasOwn(object, property);"
],
invalid: [
{
code: "Object.hasOwnProperty.call(obj, 'foo')",
output: "Object.hasOwn('foo')",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 1,
endLine: 1,
endColumn: 39
}]
},
{
code: "Object.hasOwnProperty.call(obj, property)",
output: "Object.hasOwn(property)",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 1,
endLine: 1,
endColumn: 42
}]
},
{
code: "Object.prototype.hasOwnProperty.call(obj, 'foo')",
output: "Object.hasOwn('foo')",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 1,
endLine: 1,
endColumn: 49
}]
},
{
code: "({}).hasOwnProperty.call(obj, 'foo')",
output: "Object.hasOwn('foo')",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 1,
endLine: 1,
endColumn: 37
}]
},
{
code: "const hasProperty = Object.prototype.hasOwnProperty.call(object, property);",
output: "const hasProperty = Object.hasOwn(property);",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 21,
endLine: 1,
endColumn: 75
}]
},
{
code: "const hasProperty = (( Object.prototype.hasOwnProperty.call(object, property) ));",
output: "const hasProperty = (( Object.hasOwn(property) ));",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 24,
endLine: 1,
endColumn: 78
}]
},
{
code: "const hasProperty = (( Object.prototype.hasOwnProperty.call ))(object, property);",
output: "const hasProperty = (( Object.hasOwn ))(property);",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 21,
endLine: 1,
endColumn: 81
}]
},
{
code: "const hasProperty = (( Object.prototype.hasOwnProperty )).call(object, property);",
output: "const hasProperty = Object.hasOwn(property);",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 21,
endLine: 1,
endColumn: 81
}]
},
{
code: "const hasProperty = (( Object.prototype )).hasOwnProperty.call(object, property);",
output: "const hasProperty = Object.hasOwn(property);",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 21,
endLine: 1,
endColumn: 81
}]
},
{
code: "const hasProperty = (( Object )).prototype.hasOwnProperty.call(object, property);",
output: "const hasProperty = Object.hasOwn(property);",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 21,
endLine: 1,
endColumn: 81
}]
},
{
code: "const hasProperty = {}.hasOwnProperty.call(object, property);",
output: "const hasProperty = Object.hasOwn(property);",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 21,
endLine: 1,
endColumn: 61
}]
},
{
code: "const hasProperty = (( {}.hasOwnProperty.call(object, property) ));",
output: "const hasProperty = (( Object.hasOwn(property) ));",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 24,
endLine: 1,
endColumn: 64
}]
},
{
code: "const hasProperty = (( {}.hasOwnProperty.call ))(object, property);",
output: "const hasProperty = (( Object.hasOwn ))(property);",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 21,
endLine: 1,
endColumn: 67
}]
},
{
code: "const hasProperty = (( {}.hasOwnProperty )).call(object, property);",
output: "const hasProperty = Object.hasOwn(property);",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 21,
endLine: 1,
endColumn: 67
}]
},
{
code: "const hasProperty = (( {} )).hasOwnProperty.call(object, property);",
output: "const hasProperty = Object.hasOwn(property);",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 21,
endLine: 1,
endColumn: 67
}]
},
{
code: "function foo(){return {}.hasOwnProperty.call(object, property)}",
output: "function foo(){return Object.hasOwn(property)}",
errors: [{
messageId: "useHasOwn",
line: 1,
column: 23,
endLine: 1,
endColumn: 63
}]
}
]
});