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valid-typeof.js
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valid-typeof.js
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/**
* @fileoverview Ensures that the results of typeof are compared against a valid string
* @author Ian Christian Myers
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/valid-typeof"),
{ RuleTester } = require("../../../lib/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
ruleTester.run("valid-typeof", rule, {
valid: [
"typeof foo === 'string'",
"typeof foo === 'object'",
"typeof foo === 'function'",
"typeof foo === 'undefined'",
"typeof foo === 'boolean'",
"typeof foo === 'number'",
"typeof foo === 'bigint'",
"'string' === typeof foo",
"'object' === typeof foo",
"'function' === typeof foo",
"'undefined' === typeof foo",
"'boolean' === typeof foo",
"'number' === typeof foo",
"typeof foo === typeof bar",
"typeof foo === baz",
"typeof foo !== someType",
"typeof bar != someType",
"someType === typeof bar",
"someType == typeof bar",
"typeof foo == 'string'",
"typeof(foo) === 'string'",
"typeof(foo) !== 'string'",
"typeof(foo) == 'string'",
"typeof(foo) != 'string'",
"var oddUse = typeof foo + 'thing'",
{
code: "typeof foo === 'number'",
options: [{ requireStringLiterals: true }]
},
{
code: "typeof foo === \"number\"",
options: [{ requireStringLiterals: true }]
},
{
code: "var baz = typeof foo + 'thing'",
options: [{ requireStringLiterals: true }]
},
{
code: "typeof foo === typeof bar",
options: [{ requireStringLiterals: true }]
},
{
code: "typeof foo === `string`",
options: [{ requireStringLiterals: true }],
parserOptions: { ecmaVersion: 6 }
},
{
code: "`object` === typeof foo",
options: [{ requireStringLiterals: true }],
parserOptions: { ecmaVersion: 6 }
},
{
code: "typeof foo === `str${somethingElse}`",
parserOptions: { ecmaVersion: 6 }
}
],
invalid: [
{
code: "typeof foo === 'strnig'",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "'strnig' === typeof foo",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "if (typeof bar === 'umdefined') {}",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "typeof foo !== 'strnig'",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "'strnig' !== typeof foo",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "if (typeof bar !== 'umdefined') {}",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "typeof foo != 'strnig'",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "'strnig' != typeof foo",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "if (typeof bar != 'umdefined') {}",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "typeof foo == 'strnig'",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "'strnig' == typeof foo",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "if (typeof bar == 'umdefined') {}",
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "if (typeof bar === `umdefined`) {}",
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "invalidValue", type: "TemplateLiteral" }]
},
{
code: "typeof foo == 'invalid string'",
options: [{ requireStringLiterals: true }],
errors: [{ messageId: "invalidValue", type: "Literal" }]
},
{
code: "typeof foo == Object",
options: [{ requireStringLiterals: true }],
errors: [{ messageId: "notString", type: "Identifier" }]
},
{
code: "typeof foo === undefined",
options: [{ requireStringLiterals: true }],
errors: [{ messageId: "notString", type: "Identifier" }]
},
{
code: "undefined === typeof foo",
options: [{ requireStringLiterals: true }],
errors: [{ messageId: "notString", type: "Identifier" }]
},
{
code: "undefined == typeof foo",
options: [{ requireStringLiterals: true }],
errors: [{ messageId: "notString", type: "Identifier" }]
},
{
code: "typeof foo === `undefined${foo}`",
options: [{ requireStringLiterals: true }],
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "notString", type: "TemplateLiteral" }]
},
{
code: "typeof foo === `${string}`",
options: [{ requireStringLiterals: true }],
parserOptions: { ecmaVersion: 6 },
errors: [{ messageId: "notString", type: "TemplateLiteral" }]
}
]
});