@drip_sync/drip/dist/cea/scope_ppl/is_operator.js

Scalable incremental sync for MongoDB aggregation pipelines

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isOperator = isOperator;
const atoms_1 = require("./atoms");
const invalid_expression_1 = require("./invalid_expression");
function isOperator(e) {
    if (!(0, atoms_1.isComposite)(e) ||
        Array.isArray(e) ||
        e === null ||
        !Object.keys(e).some((e) => e.startsWith("$"))) {
        return false;
    }
    const keys = Object.keys(e);
    if (keys.length !== 1) {
        throw new invalid_expression_1.InvalidExpression("an expression specification must contain exactly one field, the name of the expression.");
    }
    // Note that scopeOperator will reject this if the
    // operator is not recognized / is banned.
    return true;
}