json-schema-describes-subset/dist/utils/type-guards/type-guards.js

Tools for static JSON schema analysis, including functions to determine if one schema describes a subset of another or if a schema describes the empty set or to convert a schema to its disjunctive normal form (DNF).

import isObject from 'lodash/isObject.js';
import includes from 'lodash/includes.js';
export function isNotNull(value) {
    return value !== null;
}
export function isNonNullable(value) {
    return value != null;
}
export function isArrayOf(isElementType) {
    return function (value) {
        if (!Array.isArray(value))
            return false;
        return value.every(isElementType);
    };
}
export function isNonArrayObject(value) {
    return isObject(value) && !Array.isArray(value);
}
export function isRecordOf(isValueType) {
    return function (value) {
        if (!isNonArrayObject(value))
            return false;
        return Object.values(value).every(isValueType);
    };
}
export function isStringWithPrefix(prefix) {
    return function (string) {
        return typeof string === 'string' && string.startsWith(prefix);
    };
}
export function isOneOf(elements) {
    return function (value) {
        return includes(elements, value);
    };
}
/**
 * Allows convenient narrowing on nullish or falsy values.
 *
 * @example
 */
export function throwError(error) {
    throw error instanceof Error ? error : new Error(error);
}
export function assertType(test, error) {
    return function (value) {
        if (!test(value)) {
            if (error instanceof Error ||
                typeof error === 'string' ||
                error === undefined) {
                throwError(error);
            }
            throwError(error(value));
        }
        return value;
    };
}
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