@graphql-tools/mock
Version:
A set of utils for faster development of GraphQL tools
79 lines (78 loc) • 2.37 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.deepResolveMockList = exports.MockList = exports.isMockList = void 0;
/**
* @internal
*/
function isMockList(obj) {
if (typeof obj?.len === 'number' ||
(Array.isArray(obj?.len) && typeof obj?.len[0] === 'number')) {
if (typeof obj.wrappedFunction === 'undefined' || typeof obj.wrappedFunction === 'function') {
return true;
}
}
return false;
}
exports.isMockList = isMockList;
/**
* This is an object you can return from your mock resolvers which calls the
* provided `mockFunction` once for each list item.
*/
class MockList {
len;
wrappedFunction;
/**
* @param length Either the exact length of items to return or an inclusive
* range of possible lengths.
* @param mockFunction The function to call for each item in the list to
* resolve it. It can return another MockList or a value.
*/
constructor(length, mockFunction) {
this.len = length;
if (typeof mockFunction !== 'undefined') {
if (typeof mockFunction !== 'function') {
throw new Error('Second argument to MockList must be a function or undefined');
}
this.wrappedFunction = mockFunction;
}
}
/**
* @internal
*/
mock() {
let arr;
if (Array.isArray(this.len)) {
arr = new Array(this.randint(this.len[0], this.len[1]));
}
else {
arr = new Array(this.len);
}
for (let i = 0; i < arr.length; i++) {
if (typeof this.wrappedFunction === 'function') {
const res = this.wrappedFunction();
if (isMockList(res)) {
arr[i] = res.mock();
}
else {
arr[i] = res;
}
}
else {
arr[i] = undefined;
}
}
return arr;
}
randint(low, high) {
return Math.floor(Math.random() * (high - low + 1) + low);
}
}
exports.MockList = MockList;
function deepResolveMockList(mockList) {
return mockList.mock().map(v => {
if (isMockList(v))
return deepResolveMockList(v);
return v;
});
}
exports.deepResolveMockList = deepResolveMockList;