pve-eslint/eslint/tests/lib/rules/no-this-before-super.js

/**
 * @fileoverview Tests for no-this-before-super rule.
 * @author Toru Nagashima
 */

"use strict";

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

const rule = require("../../../lib/rules/no-this-before-super");
const { RuleTester } = require("../../../lib/rule-tester");

//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------

const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 2022 } });

ruleTester.run("no-this-before-super", rule, {
    valid: [

        /*
         * if the class has no extends or `extends null`, just ignore.
         * those classes cannot call `super()`.
         */
        "class A { }",
        "class A { constructor() { } }",
        "class A { constructor() { this.b = 0; } }",
        "class A { constructor() { this.b(); } }",
        "class A extends null { }",
        "class A extends null { constructor() { } }",

        // allows `this`/`super` after `super()`.
        "class A extends B { }",
        "class A extends B { constructor() { super(); } }",
        "class A extends B { constructor() { super(); this.c = this.d; } }",
        "class A extends B { constructor() { super(); this.c(); } }",
        "class A extends B { constructor() { super(); super.c(); } }",
        "class A extends B { constructor() { if (true) { super(); } else { super(); } this.c(); } }",
        "class A extends B { constructor() { foo = super(); this.c(); } }",
        "class A extends B { constructor() { foo += super().a; this.c(); } }",
        "class A extends B { constructor() { foo |= super().a; this.c(); } }",
        "class A extends B { constructor() { foo &= super().a; this.c(); } }",

        // allows `this`/`super` in nested executable scopes, even if before `super()`.
        "class A extends B { constructor() { class B extends C { constructor() { super(); this.d = 0; } } super(); } }",
        "class A extends B { constructor() { var B = class extends C { constructor() { super(); this.d = 0; } }; super(); } }",
        "class A extends B { constructor() { function c() { this.d(); } super(); } }",
        "class A extends B { constructor() { var c = function c() { this.d(); }; super(); } }",
        "class A extends B { constructor() { var c = () => this.d(); super(); } }",

        // ignores out of constructors.
        "class A { b() { this.c = 0; } }",
        "class A extends B { c() { this.d = 0; } }",
        "function a() { this.b = 0; }",

        // multi code path.
        "class A extends B { constructor() { if (a) { super(); this.a(); } else { super(); this.b(); } } }",
        "class A extends B { constructor() { if (a) super(); else super(); this.a(); } }",
        "class A extends B { constructor() { try { super(); } finally {} this.a(); } }",

        // https://github.com/eslint/eslint/issues/5261
        "class A extends B { constructor(a) { super(); for (const b of a) { this.a(); } } }",
        "class A extends B { constructor(a) { for (const b of a) { foo(b); } super(); } }",

        // https://github.com/eslint/eslint/issues/5319
        "class A extends B { constructor(a) { super(); this.a = a && function(){} && this.foo; } }",

        // https://github.com/eslint/eslint/issues/5394
        [
            "class A extends Object {",
            "    constructor() {",
            "        super();",
            "        for (let i = 0; i < 0; i++);",
            "        this;",
            "    }",
            "}"
        ].join("\n"),

        // https://github.com/eslint/eslint/issues/5894
        "class A { constructor() { return; this; } }",
        "class A extends B { constructor() { return; this; } }",

        // https://github.com/eslint/eslint/issues/8848
        `
            class A extends B {
                constructor(props) {
                    super(props);

                    try {
                        let arr = [];
                        for (let a of arr) {
                        }
                    } catch (err) {
                    }
                }
            }
        `,

        // Class field initializers are always evaluated after `super()`.
        "class C { field = this.toString(); }",
        "class C extends B { field = this.foo(); }",
        "class C extends B { field = this.foo(); constructor() { super(); } }",
        "class C extends B { field = this.foo(); constructor() { } }" // < in this case, initializers are never evaluated.
    ],
    invalid: [

        // disallows all `this`/`super` if `super()` is missing.
        {
            code: "class A extends B { constructor() { this.c = 0; } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { this.c(); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { super.c(); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "super" }, type: "Super" }]
        },

        // disallows `this`/`super` before `super()`.
        {
            code: "class A extends B { constructor() { this.c = 0; super(); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { this.c(); super(); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { super.c(); super(); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "super" }, type: "Super" }]
        },

        // disallows `this`/`super` in arguments of `super()`.
        {
            code: "class A extends B { constructor() { super(this.c); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { super(this.c()); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { super(super.c()); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "super" }, type: "Super" }]
        },

        // even if is nested, reports correctly.
        {
            code: "class A extends B { constructor() { class C extends D { constructor() { super(); this.e(); } } this.f(); super(); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression", column: 96 }]
        },
        {
            code: "class A extends B { constructor() { class C extends D { constructor() { this.e(); super(); } } super(); this.f(); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression", column: 73 }]
        },

        // multi code path.
        {
            code: "class A extends B { constructor() { if (a) super(); this.a(); } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { try { super(); } finally { this.a; } } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { try { super(); } catch (err) { } this.a; } }",
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { foo &&= super().a; this.c(); } }",
            parserOptions: { ecmaVersion: 2021 },
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { foo ||= super().a; this.c(); } }",
            parserOptions: { ecmaVersion: 2021 },
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        },
        {
            code: "class A extends B { constructor() { foo ??= super().a; this.c(); } }",
            parserOptions: { ecmaVersion: 2021 },
            errors: [{ messageId: "noBeforeSuper", data: { kind: "this" }, type: "ThisExpression" }]
        }
    ]
});