@frauschert/ts-guard/lib/guards/isString/isString.js

ts-guard is a typescript library that provides composable type guards. Its inspired by zod but focusses only on type guards and is more lightweight.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isString = isString;
function isString(constraints) {
    return (value) => {
        if (typeof value !== "string") {
            return false;
        }
        if (!constraints) {
            return true;
        }
        const stringToTest = constraints.trim ? value.trim() : value;
        if (constraints.minLength !== undefined && stringToTest.length < constraints.minLength) {
            return false;
        }
        if (constraints.maxLength !== undefined && stringToTest.length > constraints.maxLength) {
            return false;
        }
        if (constraints.pattern && !constraints.pattern.test(stringToTest)) {
            return false;
        }
        return true;
    };
}
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