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Rslint

    prefer-unicode-code-point-escapes

    Unreleased

    Configuration

    PresetConfigured Value
    ✅ unicornPlugin.configs.recommended"error"
    rslint.config.ts
    import { defineConfig, unicornPlugin } from '@rslint/core';

export default defineConfig([
  unicornPlugin.configs.recommended,
  {
    rules: {
      'unicorn/prefer-unicode-code-point-escapes': 'error',
    },
  },
]);

    Rule Details

    Prefer Unicode code point escapes such as \u{61} over hexadecimal, four-digit Unicode, and legacy octal escapes in strings and untagged templates. Adjacent high and low surrogate escapes become a single code point escape.

    Examples of incorrect code for this rule:

    const letter = '\x7A';
const symbol = '\uD83D\uDCA9';
const template = `\u2661${value}`;
const pattern = /\u0061/u;

    Examples of correct code for this rule:

    const letter = '\u{7A}';
const symbol = '\u{1F4A9}';
const template = `\u{2661}${value}`;
const pattern = /\u{61}/u;

    The rule has no options. Strings, untagged templates, and regular expressions with a u or v flag are automatically fixable. Regular expression control escapes such as \cA are also converted. Surrogate escapes inside regular expression character classes are left unchanged.

    For a regular expression without u or v, the rule offers a suggestion to convert its escapes and add u. Adding Unicode mode can change matching behavior, so this conversion is never an automatic fix. No suggestion is offered if the converted pattern would be invalid.

    Tagged template contents are ignored because tag functions can observe their raw text. Escaped backslashes, common escapes such as \n and \0, and existing code point escapes are left unchanged. The rule does not interpret string arguments to RegExp as regular expression patterns.

    Differences from upstream

    In JavaScript scripts, rslint reports legacy octal escapes such as '\123' and non-octal decimal escapes such as '\8' as syntax errors, so this rule cannot fix them. ESLint accepts them in non-strict scripts. Replace '\123' with '\u{53}' and '\8' with '8' before linting with rslint.

    Original Documentation