@prestodb/presto-js-client/src/utils.js

This is a Presto JavaScript client that connects to Presto via Presto's REST API to run queries.

/**
 * Parses a JSON including bigger numbers into BigInts
 * This function checks if JSON.parse reviver callback has a context parameter
 * and falls back onto the default parsing if not.
 * See also:
 * - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse#browser_compatibility
 * - https://github.com/tc39/proposal-json-parse-with-source
 * @param _ Key
 * @param value Parsed value
 * @param context Context with source text
 * @returns Parsed object with BigInts where required
 */ "use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
Object.defineProperty(exports, "parseWithBigInts", {
    enumerable: true,
    get: function() {
        return parseWithBigInts;
    }
});
function parseWithBigInts(_, value, context) {
    if (!(context == null ? void 0 : context.source)) return value // Context source is not available, fallback to default parse
    ;
    // Ignore non-numbers
    if (typeof value != 'number') return value;
    // If not an integer, use the value
    // TODO: Check if Presto can return floats that could also lose precision
    if (!Number.isInteger(value)) return value;
    // If number is a safe integer, we can use it
    if (Number.isSafeInteger(value)) return value;
    return BigInt(context.source);
}