fast-check
Version:
Property based testing framework for JavaScript (like QuickCheck)
45 lines (44 loc) • 1.99 kB
JavaScript
import { Error, safeEvery, safeMap } from '../../../utils/globals.js';
const safeObjectCreate = Object.create;
const safeObjectDefineProperty = Object.defineProperty;
const safeObjectGetOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
const safeObjectGetPrototypeOf = Object.getPrototypeOf;
const safeReflectOwnKeys = Reflect.ownKeys;
export function keyValuePairsToObjectMapper(definition) {
const obj = definition[1] ? safeObjectCreate(null) : {};
for (const keyValue of definition[0]) {
safeObjectDefineProperty(obj, keyValue[0], {
enumerable: true,
configurable: true,
writable: true,
value: keyValue[1],
});
}
return obj;
}
function isValidPropertyNameFilter(descriptor) {
return (descriptor !== undefined &&
!!descriptor.configurable &&
!!descriptor.enumerable &&
!!descriptor.writable &&
descriptor.get === undefined &&
descriptor.set === undefined);
}
export function keyValuePairsToObjectUnmapper(value) {
if (typeof value !== 'object' || value === null) {
throw new Error('Incompatible instance received: should be a non-null object');
}
const hasNullPrototype = safeObjectGetPrototypeOf(value) === null;
const hasObjectPrototype = 'constructor' in value && value.constructor === Object;
if (!hasNullPrototype && !hasObjectPrototype) {
throw new Error('Incompatible instance received: should be of exact type Object');
}
const propertyDescriptors = safeMap(safeReflectOwnKeys(value), (key) => [
key,
safeObjectGetOwnPropertyDescriptor(value, key),
]);
if (!safeEvery(propertyDescriptors, ([, descriptor]) => isValidPropertyNameFilter(descriptor))) {
throw new Error('Incompatible instance received: should contain only c/e/w properties without get/set');
}
return [safeMap(propertyDescriptors, ([key, descriptor]) => [key, descriptor.value]), hasNullPrototype];
}