apollo-client/queries/directives.js

A simple yet functional GraphQL client.

export function shouldInclude(selection, variables) {
    if (variables === void 0) { variables = {}; }
    if (!selection.directives) {
        return true;
    }
    var res = true;
    selection.directives.forEach(function (directive) {
        if (directive.name.value !== 'skip' && directive.name.value !== 'include') {
            return;
        }
        var directiveArguments = directive.arguments || [];
        var directiveName = directive.name.value;
        if (directiveArguments.length !== 1) {
            throw new Error("Incorrect number of arguments for the @" + directiveName + " directive.");
        }
        var ifArgument = directiveArguments[0];
        if (!ifArgument.name || ifArgument.name.value !== 'if') {
            throw new Error("Invalid argument for the @" + directiveName + " directive.");
        }
        var ifValue = directiveArguments[0].value;
        var evaledValue = false;
        if (!ifValue || ifValue.kind !== 'BooleanValue') {
            if (ifValue.kind !== 'Variable') {
                throw new Error("Argument for the @" + directiveName + " directive must be a variable or a bool ean value.");
            }
            else {
                evaledValue = variables[ifValue.name.value];
                if (evaledValue === undefined) {
                    throw new Error("Invalid variable referenced in @" + directiveName + " directive.");
                }
            }
        }
        else {
            evaledValue = ifValue.value;
        }
        if (directiveName === 'skip') {
            evaledValue = !evaledValue;
        }
        if (!evaledValue) {
            res = false;
        }
    });
    return res;
}
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