/
no-useless-escape.js
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/
no-useless-escape.js
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/**
* @fileoverview Look for useless escapes in strings and regexes
* @author Onur Temizkan
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-useless-escape"),
{ RuleTester } = require("../../../lib/rule-tester");
const ruleTester = new RuleTester();
ruleTester.run("no-useless-escape", rule, {
valid: [
"var foo = /\\./",
"var foo = /\\//g",
"var foo = /\"\"/",
"var foo = /''/",
"var foo = /([A-Z])\\t+/g",
"var foo = /([A-Z])\\n+/g",
"var foo = /([A-Z])\\v+/g",
"var foo = /\\D/",
"var foo = /\\W/",
"var foo = /\\w/",
"var foo = /\\B/",
"var foo = /\\\\/g",
"var foo = /\\w\\$\\*\\./",
"var foo = /\\^\\+\\./",
"var foo = /\\|\\}\\{\\./",
"var foo = /]\\[\\(\\)\\//",
"var foo = \"\\x123\"",
"var foo = \"\\u00a9\"",
"var foo = \"\\377\"",
"var foo = \"\\\"\"",
"var foo = \"xs\\u2111\"",
"var foo = \"foo \\\\ bar\";",
"var foo = \"\\t\";",
"var foo = \"foo \\b bar\";",
"var foo = '\\n';",
"var foo = 'foo \\r bar';",
"var foo = '\\v';",
"var foo = '\\f';",
"var foo = '\\\n';",
"var foo = '\\\r\n';",
{ code: "<foo attr=\"\\d\"/>", parserOptions: { ecmaFeatures: { jsx: true } } },
{ code: "<div> Testing: \\ </div>", parserOptions: { ecmaFeatures: { jsx: true } } },
{ code: "<div> Testing: \ </div>", parserOptions: { ecmaFeatures: { jsx: true } } },
{ code: "<foo attr='\\d'></foo>", parserOptions: { ecmaFeatures: { jsx: true } } },
{ code: "<> Testing: \\ </>", parserOptions: { ecmaFeatures: { jsx: true } } },
{ code: "<> Testing: \ </>", parserOptions: { ecmaFeatures: { jsx: true } } },
{ code: "var foo = `\\x123`", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `\\u00a9`", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `xs\\u2111`", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `foo \\\\ bar`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `\\t`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `foo \\b bar`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `\\n`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `foo \\r bar`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `\\v`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `\\f`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `\\\n`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `\\\r\n`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo} \\x123`", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo} \\u00a9`", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo} xs\\u2111`", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo} \\\\ ${bar}`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo} \\b ${bar}`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo}\\t`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo}\\n`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo}\\r`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo}\\v`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo}\\f`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo}\\\n`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `${foo}\\\r\n`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `\\``", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `\\`${foo}\\``", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `\\${{${foo}`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = `$\\{{${foo}`;", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = String.raw`\\.`", parserOptions: { ecmaVersion: 6 } },
{ code: "var foo = myFunc`\\.`", parserOptions: { ecmaVersion: 6 } },
String.raw`var foo = /[\d]/`,
String.raw`var foo = /[a\-b]/`,
String.raw`var foo = /foo\?/`,
String.raw`var foo = /example\.com/`,
String.raw`var foo = /foo\|bar/`,
String.raw`var foo = /\^bar/`,
String.raw`var foo = /[\^bar]/`,
String.raw`var foo = /\(bar\)/`,
String.raw`var foo = /[[\]]/`, // A character class containing '[' and ']'
String.raw`var foo = /[[]\./`, // A character class containing '[', followed by a '.' character
String.raw`var foo = /[\]\]]/`, // A (redundant) character class containing ']'
String.raw`var foo = /\[abc]/`, // Matches the literal string '[abc]'
String.raw`var foo = /\[foo\.bar]/`, // Matches the literal string '[foo.bar]'
String.raw`var foo = /vi/m`,
String.raw`var foo = /\B/`,
// https://github.com/eslint/eslint/issues/7472
String.raw`var foo = /\0/`, // null character
"var foo = /\\1/", // \x01 character (octal literal)
"var foo = /(a)\\1/", // backreference
"var foo = /(a)\\12/", // backreference
"var foo = /[\\0]/", // null character in character class
"var foo = 'foo \\\u2028 bar'",
"var foo = 'foo \\\u2029 bar'",
// https://github.com/eslint/eslint/issues/7789
String.raw`/]/`,
String.raw`/\]/`,
{ code: String.raw`/\]/u`, parserOptions: { ecmaVersion: 6 } },
String.raw`var foo = /foo\]/`,
String.raw`var foo = /[[]\]/`, // A character class containing '[', followed by a ']' character
String.raw`var foo = /\[foo\.bar\]/`,
// ES2018
{ code: String.raw`var foo = /(?<a>)\k<a>/`, parserOptions: { ecmaVersion: 2018 } },
{ code: String.raw`var foo = /(\\?<a>)/`, parserOptions: { ecmaVersion: 2018 } },
{ code: String.raw`var foo = /\p{ASCII}/u`, parserOptions: { ecmaVersion: 2018 } },
{ code: String.raw`var foo = /\P{ASCII}/u`, parserOptions: { ecmaVersion: 2018 } },
{ code: String.raw`var foo = /[\p{ASCII}]/u`, parserOptions: { ecmaVersion: 2018 } },
{ code: String.raw`var foo = /[\P{ASCII}]/u`, parserOptions: { ecmaVersion: 2018 } }
],
invalid: [
{
code: "var foo = /\\#/;",
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\#.",
type: "Literal",
suggestions: [{
desc: "Remove unnecessary escape.",
fix: { range: [11, 12], text: "" }
}, {
desc: "Escape backslash to include it in the RegExp.",
fix: { range: [11, 11], text: "\\" }
}]
}]
},
{
code: "var foo = /\\;/;",
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\;.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = /;/;"
}, {
messageId: "escapeBackslash",
output: "var foo = /\\\\;/;"
}]
}]
},
{
code: "var foo = \"\\'\";",
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\'.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = \"'\";"
}, {
messageId: "escapeBackslash",
output: "var foo = \"\\\\'\";"
}]
}]
},
// TODO update the rest of these
{ code: "var foo = \"\\#/\";", errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\#.", type: "Literal" }] },
{ code: "var foo = \"\\a\"", errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\a.", type: "Literal" }] },
{ code: "var foo = \"\\B\";", errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\B.", type: "Literal" }] },
{ code: "var foo = \"\\@\";", errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\@.", type: "Literal" }] },
{ code: "var foo = \"foo \\a bar\";", errors: [{ line: 1, column: 16, endColumn: 17, message: "Unnecessary escape character: \\a.", type: "Literal" }] },
{ code: "var foo = '\\\"';", errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\\".", type: "Literal" }] },
{ code: "var foo = '\\#';", errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\#.", type: "Literal" }] },
{ code: "var foo = '\\$';", errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\$.", type: "Literal" }] },
{ code: "var foo = '\\p';", errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\p.", type: "Literal" }] },
{
code: "var foo = '\\p\\a\\@';",
errors: [
{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\p.", type: "Literal" },
{ line: 1, column: 14, endColumn: 15, message: "Unnecessary escape character: \\a.", type: "Literal" },
{ line: 1, column: 16, endColumn: 17, message: "Unnecessary escape character: \\@.", type: "Literal" }
]
},
{
code: "<foo attr={\"\\d\"}/>",
parserOptions: { ecmaFeatures: { jsx: true } },
errors: [{ line: 1, column: 13, endColumn: 14, message: "Unnecessary escape character: \\d.", type: "Literal" }]
},
{ code: "var foo = '\\`';", errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\`.", type: "Literal" }] },
{ code: "var foo = `\\\"`;", parserOptions: { ecmaVersion: 6 }, errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\\".", type: "TemplateElement" }] },
{ code: "var foo = `\\'`;", parserOptions: { ecmaVersion: 6 }, errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\'.", type: "TemplateElement" }] },
{ code: "var foo = `\\#`;", parserOptions: { ecmaVersion: 6 }, errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\#.", type: "TemplateElement" }] },
{
code: "var foo = '\\`foo\\`';",
errors: [
{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\`.", type: "Literal" },
{ line: 1, column: 17, endColumn: 18, message: "Unnecessary escape character: \\`.", type: "Literal" }
]
},
{
code: "var foo = `\\\"${foo}\\\"`;",
parserOptions: { ecmaVersion: 6 },
errors: [
{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\\".", type: "TemplateElement" },
{ line: 1, column: 20, endColumn: 21, message: "Unnecessary escape character: \\\".", type: "TemplateElement" }
]
},
{
code: "var foo = `\\'${foo}\\'`;",
parserOptions: { ecmaVersion: 6 },
errors: [
{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\'.", type: "TemplateElement" },
{ line: 1, column: 20, endColumn: 21, message: "Unnecessary escape character: \\'.", type: "TemplateElement" }
]
},
{
code: "var foo = `\\#${foo}`;",
parserOptions: { ecmaVersion: 6 },
errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\#.", type: "TemplateElement" }]
},
{
code: "let foo = '\\ ';",
parserOptions: { ecmaVersion: 6 },
errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\ .", type: "Literal" }]
},
{
code: "let foo = /\\ /;",
parserOptions: { ecmaVersion: 6 },
errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\ .", type: "Literal" }]
},
{
code: "var foo = `\\$\\{{${foo}`;",
parserOptions: { ecmaVersion: 6 },
errors: [
{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\$.", type: "TemplateElement" }
]
},
{
code: "var foo = `\\$a${foo}`;",
parserOptions: { ecmaVersion: 6 },
errors: [
{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\$.", type: "TemplateElement" }
]
},
{
code: "var foo = `a\\{{${foo}`;",
parserOptions: { ecmaVersion: 6 },
errors: [
{ line: 1, column: 13, endColumn: 14, message: "Unnecessary escape character: \\{.", type: "TemplateElement" }
]
},
{
code: String.raw`var foo = /[ab\-]/`,
errors: [{ line: 1, column: 15, endColumn: 16, message: "Unnecessary escape character: \\-.", type: "Literal" }]
},
{
code: String.raw`var foo = /[\-ab]/`,
errors: [{ line: 1, column: 13, endColumn: 14, message: "Unnecessary escape character: \\-.", type: "Literal" }]
},
{
code: String.raw`var foo = /[ab\?]/`,
errors: [{ line: 1, column: 15, endColumn: 16, message: "Unnecessary escape character: \\?.", type: "Literal" }]
},
{
code: String.raw`var foo = /[ab\.]/`,
errors: [{ line: 1, column: 15, endColumn: 16, message: "Unnecessary escape character: \\..", type: "Literal" }]
},
{
code: String.raw`var foo = /[a\|b]/`,
errors: [{ line: 1, column: 14, endColumn: 15, message: "Unnecessary escape character: \\|.", type: "Literal" }]
},
{
code: String.raw`var foo = /\-/`,
errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\-.", type: "Literal" }]
},
{
code: String.raw`var foo = /[\-]/`,
errors: [{ line: 1, column: 13, endColumn: 14, message: "Unnecessary escape character: \\-.", type: "Literal" }]
},
{
code: String.raw`var foo = /[ab\$]/`,
errors: [{ line: 1, column: 15, endColumn: 16, message: "Unnecessary escape character: \\$.", type: "Literal" }]
},
{
code: String.raw`var foo = /[\(paren]/`,
errors: [{ line: 1, column: 13, endColumn: 14, message: "Unnecessary escape character: \\(.", type: "Literal" }]
},
{
code: String.raw`var foo = /[\[]/`,
errors: [{ line: 1, column: 13, endColumn: 14, message: "Unnecessary escape character: \\[.", type: "Literal" }]
},
{
code: String.raw`var foo = /[\/]/`, // A character class containing '/'
errors: [{ line: 1, column: 13, endColumn: 14, message: "Unnecessary escape character: \\/.", type: "Literal" }]
},
{
code: String.raw`var foo = /[\B]/`,
errors: [{ line: 1, column: 13, endColumn: 14, message: "Unnecessary escape character: \\B.", type: "Literal" }]
},
{
code: String.raw`var foo = /[a][\-b]/`,
errors: [{ line: 1, column: 16, endColumn: 17, message: "Unnecessary escape character: \\-.", type: "Literal" }]
},
{
code: String.raw`var foo = /\-[]/`,
errors: [{ line: 1, column: 12, endColumn: 13, message: "Unnecessary escape character: \\-.", type: "Literal" }]
},
{
code: String.raw`var foo = /[a\^]/`,
errors: [{ line: 1, column: 14, endColumn: 15, message: "Unnecessary escape character: \\^.", type: "Literal" }]
},
{
code: "`multiline template\nliteral with useless \\escape`",
parserOptions: { ecmaVersion: 6 },
errors: [{ line: 2, column: 22, endColumn: 23, message: "Unnecessary escape character: \\e.", type: "TemplateElement" }]
},
{
code: "`\\a```",
parserOptions: { ecmaVersion: 6 },
errors: [{ line: 1, column: 2, endColumn: 3, message: "Unnecessary escape character: \\a.", type: "TemplateElement" }]
}
]
});