在 javascript 中使用 Public 关键字时出现意外的令牌

Question

根据 Apollo 文档添加自定义指令如下：

class isAuth extends SchemaDirectiveVisitor {
    // field defination for resolving
    // directive.
    public visitFieldDefinition(field) {
        // overspreading.
        const { resolve = defaultFieldResolver } = field;

        // resolve field.
        field.resolve = async function(__, Context) {
            // check if Context
            // contain's user object
            // which was resolved by jwt.
            if(!Context.user){
                throw new Error('User not authenticated');
            }

            // resolve return awaited resolve call.
            return await resolve.apply(this, __);
        };
    }
}

但使用它会导致意外的令牌错误。

class isAuth extends SchemaDirectiveVisitor {
    // field defination for resolving
    // directive.
    visitFieldDefinition(field) { <---- Removed Public keyword
        // overspreading.
        const { resolve = defaultFieldResolver } = field;

        // resolve field.
        field.resolve = async function(__, Context) {
            // check if Context
            // contain's user object
            // which was resolved by jwt.
            if(!Context.user){
                throw new Error('User not authenticated');
            }

            // resolve return awaited resolve call.
            return await resolve.apply(this, __);
        };
    }
}

这将起作用，但不适用于 apollo 包。

请注意：Apollo 是 graphql 库

Answer 1

public 关键字存在于 JavaScript 中，但它是 reserved for future use。

因此，从 2019 年开始，任何 JavaScript 解析器都会给您带来意外的令牌错误。