/
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: [{
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 = /\\\\;/;"
}]
}]
},
{
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 = \"\\\\#/\";"
}]
}]
},
{
code: "var foo = \"\\a\"",
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\a.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = \"a\""
}, {
messageId: "escapeBackslash",
output: "var foo = \"\\\\a\""
}]
}]
},
{
code: "var foo = \"\\B\";",
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\B.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = \"B\";"
}, {
messageId: "escapeBackslash",
output: "var foo = \"\\\\B\";"
}]
}]
},
{
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 = \"foo \\a bar\";",
errors: [{
line: 1,
column: 16,
endColumn: 17,
message: "Unnecessary escape character: \\a.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = \"foo a bar\";"
}, {
messageId: "escapeBackslash",
output: "var foo = \"foo \\\\a bar\";"
}]
}]
},
{
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 = '\\\\#';"
}]
}]
},
{
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 = '\\p';",
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\p.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = 'p';"
}, {
messageId: "escapeBackslash",
output: "var foo = '\\\\p';"
}]
}]
},
{
code: "var foo = '\\p\\a\\@';",
errors: [
{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\p.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = 'p\\a\\@';"
}, {
messageId: "escapeBackslash",
output: "var foo = '\\\\p\\a\\@';"
}]
},
{
line: 1,
column: 14,
endColumn: 15,
message: "Unnecessary escape character: \\a.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = '\\pa\\@';"
}, {
messageId: "escapeBackslash",
output: "var foo = '\\p\\\\a\\@';"
}]
},
{
line: 1,
column: 16,
endColumn: 17,
message: "Unnecessary escape character: \\@.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = '\\p\\a@';"
}, {
messageId: "escapeBackslash",
output: "var foo = '\\p\\a\\\\@';"
}]
}
]
},
{
code: "<foo attr={\"\\d\"}/>",
parserOptions: { ecmaFeatures: { jsx: true } },
errors: [{
line: 1,
column: 13,
endColumn: 14,
message: "Unnecessary escape character: \\d.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "<foo attr={\"d\"}/>"
}, {
messageId: "escapeBackslash",
output: "<foo attr={\"\\\\d\"}/>"
}]
}]
},
{
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 = `\\\"`;",
parserOptions: { ecmaVersion: 6 },
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\\".",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `\"`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `\\\\\"`;"
}]
}]
},
{
code: "var foo = `\\'`;",
parserOptions: { ecmaVersion: 6 },
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\'.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `'`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `\\\\'`;"
}]
}]
},
{
code: "var foo = `\\#`;",
parserOptions: { ecmaVersion: 6 },
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\#.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `#`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `\\\\#`;"
}]
}]
},
{
code: "var foo = '\\`foo\\`';",
errors: [
{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\`.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = '`foo\\`';"
}, {
messageId: "escapeBackslash",
output: "var foo = '\\\\`foo\\`';"
}]
},
{
line: 1,
column: 17,
endColumn: 18,
message: "Unnecessary escape character: \\`.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "var foo = '\\`foo`';"
}, {
messageId: "escapeBackslash",
output: "var foo = '\\`foo\\\\`';"
}]
}
]
},
{
code: "var foo = `\\\"${foo}\\\"`;",
parserOptions: { ecmaVersion: 6 },
errors: [
{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\\".",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `\"${foo}\\\"`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `\\\\\"${foo}\\\"`;"
}]
},
{
line: 1,
column: 20,
endColumn: 21,
message: "Unnecessary escape character: \\\".",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `\\\"${foo}\"`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `\\\"${foo}\\\\\"`;"
}]
}
]
},
{
code: "var foo = `\\'${foo}\\'`;",
parserOptions: { ecmaVersion: 6 },
errors: [
{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\'.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `'${foo}\\'`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `\\\\'${foo}\\'`;"
}]
},
{
line: 1,
column: 20,
endColumn: 21,
message: "Unnecessary escape character: \\'.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `\\'${foo}'`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `\\'${foo}\\\\'`;"
}]
}
]
},
{
code: "var foo = `\\#${foo}`;",
parserOptions: { ecmaVersion: 6 },
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\#.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `#${foo}`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `\\\\#${foo}`;"
}]
}]
},
{
code: "let foo = '\\ ';",
parserOptions: { ecmaVersion: 6 },
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\ .",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "let foo = ' ';"
}, {
messageId: "escapeBackslash",
output: "let foo = '\\\\ ';"
}]
}]
},
{
code: "let foo = /\\ /;",
parserOptions: { ecmaVersion: 6 },
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\ .",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: "let foo = / /;"
}, {
messageId: "escapeBackslash",
output: "let foo = /\\\\ /;"
}]
}]
},
{
code: "var foo = `\\$\\{{${foo}`;",
parserOptions: { ecmaVersion: 6 },
errors: [
{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\$.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `$\\{{${foo}`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `\\\\$\\{{${foo}`;"
}]
}
]
},
{
code: "var foo = `\\$a${foo}`;",
parserOptions: { ecmaVersion: 6 },
errors: [
{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\$.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `$a${foo}`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `\\\\$a${foo}`;"
}]
}
]
},
{
code: "var foo = `a\\{{${foo}`;",
parserOptions: { ecmaVersion: 6 },
errors: [
{
line: 1,
column: 13,
endColumn: 14,
message: "Unnecessary escape character: \\{.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "var foo = `a{{${foo}`;"
}, {
messageId: "escapeBackslash",
output: "var foo = `a\\\\{{${foo}`;"
}]
}
]
},
{
code: String.raw`var foo = /[ab\-]/`,
errors: [{
line: 1,
column: 15,
endColumn: 16,
message: "Unnecessary escape character: \\-.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[ab-]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[ab\\-]/`
}]
}]
},
{
code: String.raw`var foo = /[\-ab]/`,
errors: [{
line: 1,
column: 13,
endColumn: 14,
message: "Unnecessary escape character: \\-.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[-ab]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[\\-ab]/`
}]
}]
},
{
code: String.raw`var foo = /[ab\?]/`,
errors: [{
line: 1,
column: 15,
endColumn: 16,
message: "Unnecessary escape character: \\?.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[ab?]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[ab\\?]/`
}]
}]
},
{
code: String.raw`var foo = /[ab\.]/`,
errors: [{
line: 1,
column: 15,
endColumn: 16,
message: "Unnecessary escape character: \\..",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[ab.]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[ab\\.]/`
}]
}]
},
{
code: String.raw`var foo = /[a\|b]/`,
errors: [{
line: 1,
column: 14,
endColumn: 15,
message: "Unnecessary escape character: \\|.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[a|b]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[a\\|b]/`
}]
}]
},
{
code: String.raw`var foo = /\-/`,
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\-.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /-/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /\\-/`
}]
}]
},
{
code: String.raw`var foo = /[\-]/`,
errors: [{
line: 1,
column: 13,
endColumn: 14,
message: "Unnecessary escape character: \\-.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[-]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[\\-]/`
}]
}]
},
{
code: String.raw`var foo = /[ab\$]/`,
errors: [{
line: 1,
column: 15,
endColumn: 16,
message: "Unnecessary escape character: \\$.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[ab$]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[ab\\$]/`
}]
}]
},
{
code: String.raw`var foo = /[\(paren]/`,
errors: [{
line: 1,
column: 13,
endColumn: 14,
message: "Unnecessary escape character: \\(.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[(paren]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[\\(paren]/`
}]
}]
},
{
code: String.raw`var foo = /[\[]/`,
errors: [{
line: 1,
column: 13,
endColumn: 14,
message: "Unnecessary escape character: \\[.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[[]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[\\[]/`
}]
}]
},
{
code: String.raw`var foo = /[\/]/`, // A character class containing '/'
errors: [{
line: 1,
column: 13,
endColumn: 14,
message: "Unnecessary escape character: \\/.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[/]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[\\/]/`
}]
}]
},
{
code: String.raw`var foo = /[\B]/`,
errors: [{
line: 1,
column: 13,
endColumn: 14,
message: "Unnecessary escape character: \\B.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[B]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[\\B]/`
}]
}]
},
{
code: String.raw`var foo = /[a][\-b]/`,
errors: [{
line: 1,
column: 16,
endColumn: 17,
message: "Unnecessary escape character: \\-.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[a][-b]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[a][\\-b]/`
}]
}]
},
{
code: String.raw`var foo = /\-[]/`,
errors: [{
line: 1,
column: 12,
endColumn: 13,
message: "Unnecessary escape character: \\-.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /-[]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /\\-[]/`
}]
}]
},
{
code: String.raw`var foo = /[a\^]/`,
errors: [{
line: 1,
column: 14,
endColumn: 15,
message: "Unnecessary escape character: \\^.",
type: "Literal",
suggestions: [{
messageId: "removeEscape",
output: String.raw`var foo = /[a^]/`
}, {
messageId: "escapeBackslash",
output: String.raw`var foo = /[a\\^]/`
}]
}]
},
{
code: "`multiline template\nliteral with useless \\escape`",
parserOptions: { ecmaVersion: 6 },
errors: [{
line: 2,
column: 22,
endColumn: 23,
message: "Unnecessary escape character: \\e.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "`multiline template\nliteral with useless escape`"
}, {
messageId: "escapeBackslash",
output: "`multiline template\nliteral with useless \\\\escape`"
}]
}]
},
{
code: "`multiline template\r\nliteral with useless \\escape`",
parserOptions: { ecmaVersion: 6 },
errors: [{
line: 2,
column: 22,
endColumn: 23,
message: "Unnecessary escape character: \\e.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "`multiline template\r\nliteral with useless escape`"
}, {
messageId: "escapeBackslash",
output: "`multiline template\r\nliteral with useless \\\\escape`"
}]
}]
},
{
code: "`template literal with line continuation \\\nand useless \\escape`",
parserOptions: { ecmaVersion: 6 },
errors: [{
line: 2,
column: 13,
endColumn: 14,
message: "Unnecessary escape character: \\e.",
type: "TemplateElement",
suggestions: [{
messageId: "removeEscape",
output: "`template literal with line continuation \\\nand useless escape`"
}, {
messageId: "escapeBackslash",
output: "`template literal with line continuation \\\nand useless \\\\escape`"
}]
}]
},
{
code: "`template literal with line continuation \\\r\nand useless \\escape`",
parserOptions: { ecmaVersion: 6 },
errors: [{
line: 2,
column: 13,
endColumn: 14,