source: node_modules/prismjs/components/prism-web-idl.js

(function (Prism) {

        var id = /(?:\B-|\b_|\b)[A-Za-z][\w-]*(?![\w-])/.source;
        var type =
                '(?:' +
                /\b(?:unsigned\s+)?long\s+long(?![\w-])/.source +
                '|' +
                /\b(?:unrestricted|unsigned)\s+[a-z]+(?![\w-])/.source +
                '|' +
                /(?!(?:unrestricted|unsigned)\b)/.source + id + /(?:\s*<(?:[^<>]|<[^<>]*>)*>)?/.source +
                ')' + /(?:\s*\?)?/.source;

        var typeInside = {};

        Prism.languages['web-idl'] = {
                'comment': {
                        pattern: /\/\/.*|\/\*[\s\S]*?\*\//,
                        greedy: true
                },
                'string': {
                        pattern: /"[^"]*"/,
                        greedy: true
                },

                'namespace': {
                        pattern: RegExp(/(\bnamespace\s+)/.source + id),
                        lookbehind: true,
                },
                'class-name': [
                        {
                                pattern: /(^|[^\w-])(?:iterable|maplike|setlike)\s*<(?:[^<>]|<[^<>]*>)*>/,
                                lookbehind: true,
                                inside: typeInside
                        },
                        {
                                pattern: RegExp(/(\b(?:attribute|const|deleter|getter|optional|setter)\s+)/.source + type),
                                lookbehind: true,
                                inside: typeInside
                        },
                        {
                                // callback return type
                                pattern: RegExp('(' + /\bcallback\s+/.source + id + /\s*=\s*/.source + ')' + type),
                                lookbehind: true,
                                inside: typeInside
                        },
                        {
                                // typedef
                                pattern: RegExp(/(\btypedef\b\s*)/.source + type),
                                lookbehind: true,
                                inside: typeInside
                        },

                        {
                                pattern: RegExp(/(\b(?:callback|dictionary|enum|interface(?:\s+mixin)?)\s+)(?!(?:interface|mixin)\b)/.source + id),
                                lookbehind: true,
                        },
                        {
                                // inheritance
                                pattern: RegExp(/(:\s*)/.source + id),
                                lookbehind: true,
                        },

                        // includes and implements
                        RegExp(id + /(?=\s+(?:implements|includes)\b)/.source),
                        {
                                pattern: RegExp(/(\b(?:implements|includes)\s+)/.source + id),
                                lookbehind: true,
                        },

                        {
                                // function return type, parameter types, and dictionary members
                                pattern: RegExp(type + '(?=' + /\s*(?:\.{3}\s*)?/.source + id + /\s*[(),;=]/.source + ')'),
                                inside: typeInside
                        },
                ],

                'builtin': /\b(?:ArrayBuffer|BigInt64Array|BigUint64Array|ByteString|DOMString|DataView|Float32Array|Float64Array|FrozenArray|Int16Array|Int32Array|Int8Array|ObservableArray|Promise|USVString|Uint16Array|Uint32Array|Uint8Array|Uint8ClampedArray)\b/,
                'keyword': [
                        /\b(?:async|attribute|callback|const|constructor|deleter|dictionary|enum|getter|implements|includes|inherit|interface|mixin|namespace|null|optional|or|partial|readonly|required|setter|static|stringifier|typedef|unrestricted)\b/,
                        // type keywords
                        /\b(?:any|bigint|boolean|byte|double|float|iterable|long|maplike|object|octet|record|sequence|setlike|short|symbol|undefined|unsigned|void)\b/
                ],
                'boolean': /\b(?:false|true)\b/,

                'number': {
                        pattern: /(^|[^\w-])-?(?:0x[0-9a-f]+|(?:\d+(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?|NaN|Infinity)(?![\w-])/i,
                        lookbehind: true
                },
                'operator': /\.{3}|[=:?<>-]/,
                'punctuation': /[(){}[\].,;]/
        };

        for (var key in Prism.languages['web-idl']) {
                if (key !== 'class-name') {
                        typeInside[key] = Prism.languages['web-idl'][key];
                }
        }

        Prism.languages['webidl'] = Prism.languages['web-idl'];

}(Prism));