|
| 1 | +/** |
| 2 | + * Type inference tests for DatePicker onChange callback |
| 3 | + * |
| 4 | + * These tests verify that TypeScript can properly infer the type of the |
| 5 | + * onChange callback parameter without explicit type annotations. |
| 6 | + * |
| 7 | + * Related issues: |
| 8 | + * - #6202: onChange type breaks after updating to 9.1.0 |
| 9 | + * - #6131: selectsMultiple prop type incompatibility when spreading props |
| 10 | + */ |
| 11 | +import React from "react"; |
| 12 | +import { render, fireEvent } from "@testing-library/react"; |
| 13 | + |
| 14 | +import DatePicker from "../index"; |
| 15 | +import { safeQuerySelector } from "./test_utils"; |
| 16 | + |
| 17 | +describe("DatePicker onChange type inference", () => { |
| 18 | + it("should infer Date | null for single date picker without explicit type annotation", () => { |
| 19 | + // This test verifies fix for issue #6202 |
| 20 | + // If TypeScript cannot infer the type, this test will fail to compile |
| 21 | + let selectedDate: Date | null = null; |
| 22 | + |
| 23 | + const { container } = render( |
| 24 | + <DatePicker |
| 25 | + selected={selectedDate} |
| 26 | + // The key test: NO explicit type annotation on `date` parameter |
| 27 | + // TypeScript should infer `date` as `Date | null` |
| 28 | + onChange={(date) => { |
| 29 | + // If type inference works, this assignment should compile without error |
| 30 | + selectedDate = date; |
| 31 | + }} |
| 32 | + />, |
| 33 | + ); |
| 34 | + |
| 35 | + const input = safeQuerySelector<HTMLInputElement>(container, "input"); |
| 36 | + fireEvent.change(input, { target: { value: "01/01/2024" } }); |
| 37 | + |
| 38 | + expect(selectedDate).not.toBeNull(); |
| 39 | + }); |
| 40 | + |
| 41 | + it("should infer [Date | null, Date | null] for range picker without explicit type annotation", () => { |
| 42 | + let startDate: Date | null = null; |
| 43 | + let endDate: Date | null = null; |
| 44 | + |
| 45 | + const { container } = render( |
| 46 | + <DatePicker |
| 47 | + selectsRange={true} |
| 48 | + startDate={startDate} |
| 49 | + endDate={endDate} |
| 50 | + // The key test: NO explicit type annotation on `dates` parameter |
| 51 | + // TypeScript should infer `dates` as `[Date | null, Date | null]` |
| 52 | + onChange={(dates) => { |
| 53 | + // If type inference works, destructuring should work without error |
| 54 | + const [start, end] = dates; |
| 55 | + startDate = start; |
| 56 | + endDate = end; |
| 57 | + }} |
| 58 | + />, |
| 59 | + ); |
| 60 | + |
| 61 | + const input = safeQuerySelector<HTMLInputElement>(container, "input"); |
| 62 | + fireEvent.change(input, { target: { value: "01/01/2024" } }); |
| 63 | + |
| 64 | + expect(startDate).not.toBeNull(); |
| 65 | + }); |
| 66 | + |
| 67 | + it("should infer Date[] | null for multiple picker without explicit type annotation", () => { |
| 68 | + let selectedDates: Date[] | null = null; |
| 69 | + |
| 70 | + const { container } = render( |
| 71 | + <DatePicker |
| 72 | + selectsMultiple={true} |
| 73 | + selectedDates={selectedDates ?? []} |
| 74 | + // The key test: NO explicit type annotation on `dates` parameter |
| 75 | + // TypeScript should infer `dates` as `Date[] | null` |
| 76 | + onChange={(dates) => { |
| 77 | + // If type inference works, this assignment should compile without error |
| 78 | + selectedDates = dates; |
| 79 | + }} |
| 80 | + />, |
| 81 | + ); |
| 82 | + |
| 83 | + const input = safeQuerySelector<HTMLInputElement>(container, "input"); |
| 84 | + fireEvent.change(input, { target: { value: "01/01/2024" } }); |
| 85 | + |
| 86 | + // Multiple picker doesn't respond to text input the same way, just verify render |
| 87 | + expect(container.querySelector("input")).toBeTruthy(); |
| 88 | + }); |
| 89 | +}); |
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