/
no-undef-init.js
157 lines (148 loc) · 6.25 KB
/
no-undef-init.js
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/**
* @fileoverview Tests for undefined rule.
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-undef-init"),
{ RuleTester } = require("../../../lib/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
ruleTester.run("no-undef-init", rule, {
valid: [
"var a;",
{ code: "const foo = undefined", parserOptions: { ecmaVersion: 6 } },
"var undefined = 5; var foo = undefined;",
// doesn't apply to class fields
{ code: "class C { field = undefined; }", parserOptions: { ecmaVersion: 2022 } }
],
invalid: [
{
code: "var a = undefined;",
output: null,
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "var a = undefined, b = 1;",
output: null,
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "var a = 1, b = undefined, c = 5;",
output: null,
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "b" }, type: "VariableDeclarator" }]
},
{
code: "var [a] = undefined;",
output: null,
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "[a]" }, type: "VariableDeclarator" }]
},
{
code: "var {a} = undefined;",
output: null,
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "{a}" }, type: "VariableDeclarator" }]
},
{
code: "for(var i in [1,2,3]){var a = undefined; for(var j in [1,2,3]){}}",
output: null,
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a = undefined;",
output: "let a;",
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a = undefined, b = 1;",
output: "let a, b = 1;",
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a = 1, b = undefined, c = 5;",
output: "let a = 1, b, c = 5;",
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "b" }, type: "VariableDeclarator" }]
},
{
code: "let [a] = undefined;",
output: null,
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "[a]" }, type: "VariableDeclarator" }]
},
{
code: "let {a} = undefined;",
output: null,
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "{a}" }, type: "VariableDeclarator" }]
},
{
code: "for(var i in [1,2,3]){let a = undefined; for(var j in [1,2,3]){}}",
output: "for(var i in [1,2,3]){let a; for(var j in [1,2,3]){}}",
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
// Should not autofix if it would remove comments
{
code: "let /* comment */a = undefined;",
output: "let /* comment */a;",
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a/**/ = undefined;",
output: null,
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a /**/ = undefined;",
output: null,
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a//\n= undefined;",
output: null,
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a = /**/undefined;",
output: null,
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a = //\nundefined;",
output: null,
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a = undefined/* comment */;",
output: "let a/* comment */;",
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a = undefined/* comment */, b;",
output: "let a/* comment */, b;",
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
},
{
code: "let a = undefined//comment\n, b;",
output: "let a//comment\n, b;",
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "unnecessaryUndefinedInit", data: { name: "a" }, type: "VariableDeclarator" }]
}
]
});