Method validateParam

src/parser.ts:2752–2782

(options, param, name)

    }

    validateParam(options, param, name) {
        const key = '$' + name;
        if (this.context.strict) {
            if (this.scanner.isRestrictedWord(name)) {
                options.stricted = param;
                options.message = Messages.StrictParamName;
            }
            if (Object.prototype.hasOwnProperty.call(options.paramSet, key)) {
                options.stricted = param;
                options.message = Messages.StrictParamDupe;
            }
        } else if (!options.firstRestricted) {
            if (this.scanner.isRestrictedWord(name)) {
                options.firstRestricted = param;
                options.message = Messages.StrictParamName;
            } else if (this.scanner.isStrictModeReservedWord(name)) {
                options.firstRestricted = param;
                options.message = Messages.StrictReservedWord;
            } else if (Object.prototype.hasOwnProperty.call(options.paramSet, key)) {
                options.stricted = param;
                options.message = Messages.StrictParamDupe;
            }
        }

        /* istanbul ignore next */
        if (typeof Object.defineProperty === 'function') {
            Object.defineProperty(options.paramSet, key, { value: true, enumerable: true, writable: true, configurable: true });
        } else {
            options.paramSet[key] = true;
        }
    }

    parseRestElement(params): Node.RestElement {
        const node = this.createNode();