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no-extraneous-class.js
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no-extraneous-class.js
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/**
* @fileoverview Forbids the use of classes as namespaces
* Some tests adapted from https://github.com/palantir/tslint/tree/c7fc99b5/test/rules/no-unnecessary-class
* @author Jed Fox
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-extraneous-class"),
RuleTester = require("eslint").RuleTester;
const empty = { messageId: "empty", type: "Identifier" };
const onlyStatic = { messageId: "onlyStatic", type: "Identifier" };
const onlyConstructor = { messageId: "onlyConstructor", type: "Identifier" };
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester({
parser: "typescript-eslint-parser",
});
ruleTester.run("no-extraneous-class", rule, {
valid: [
`
class Foo {
public prop = 1;
constructor() {}
}
`.trim(),
`
export class CClass extends BaseClass {
public static helper(): void {}
private static privateHelper(): boolean {
return true;
}
constructor() {}
}
`.trim(),
`
class Foo {
constructor(
public bar: string
) {}
}
`.trim(),
{
code: "class Foo {}",
options: [{ allowEmpty: true }],
},
{
code: `
class Foo {
constructor() {}
}
`.trim(),
options: [{ allowConstructorOnly: true }],
},
{
code: `
export class Bar {
public static helper(): void {}
private static privateHelper(): boolean {
return true;
}
}
`.trim(),
options: [{ allowStaticOnly: true }],
},
],
invalid: [
{
code: "class Foo {}",
errors: [empty],
},
{
code: `
class Foo {
public prop = 1;
constructor() {
class Bar {
static PROP = 2;
}
}
}
export class Bar {
public static helper(): void {}
private static privateHelper(): boolean {
return true;
}
}
`.trim(),
errors: [onlyStatic, onlyStatic],
},
{
code: `
class Foo {
constructor() {}
}
`.trim(),
errors: [onlyConstructor],
},
{
code: `
export class AClass {
public static helper(): void {}
private static privateHelper(): boolean {
return true;
}
constructor() {
class nestedClass {
}
}
}
`.trim(),
errors: [onlyStatic, empty],
},
],
});