source: node_modules/prismjs/components/prism-firestore-security-rules.js

Prism.languages['firestore-security-rules'] = Prism.languages.extend('clike', {
        'comment': /\/\/.*/,
        'keyword': /\b(?:allow|function|if|match|null|return|rules_version|service)\b/,
        'operator': /&&|\|\||[<>!=]=?|[-+*/%]|\b(?:in|is)\b/,
});

delete Prism.languages['firestore-security-rules']['class-name'];

Prism.languages.insertBefore('firestore-security-rules', 'keyword', {
        'path': {
                pattern: /(^|[\s(),])(?:\/(?:[\w\xA0-\uFFFF]+|\{[\w\xA0-\uFFFF]+(?:=\*\*)?\}|\$\([\w\xA0-\uFFFF.]+\)))+/,
                lookbehind: true,
                greedy: true,
                inside: {
                        'variable': {
                                pattern: /\{[\w\xA0-\uFFFF]+(?:=\*\*)?\}|\$\([\w\xA0-\uFFFF.]+\)/,
                                inside: {
                                        'operator': /=/,
                                        'keyword': /\*\*/,
                                        'punctuation': /[.$(){}]/
                                }
                        },
                        'punctuation': /\//
                }
        },
        'method': {
                // to make the pattern shorter, the actual method names are omitted
                pattern: /(\ballow\s+)[a-z]+(?:\s*,\s*[a-z]+)*(?=\s*[:;])/,
                lookbehind: true,
                alias: 'builtin',
                inside: {
                        'punctuation': /,/
                }
        },
});