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Use mobx for state management
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‎AGENTS.md‎

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### Core concepts
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* rendered (realized) questionnaire response is form managed by `FormStore`, which keeps a registry of top-level nodes
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* rendered questionnaire response item is node (one of the node stores implementing `INodeStore`)
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* questionnaire item is template for node (`QuestionnaireItem` backing each store)
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* nodes can have child nodes (`children` or `instances` on the store)
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* node can be either a display, a group, or a question (`DisplayStore`, `NonRepeatingGroupStore`/`RepeatingGroupStore`, `QuestionStore`)
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* display node cannot have child nodes
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* question node is answerable node
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* display node and group node are not answerable nodes
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* group node can be repeated
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* repeatable group node can have multiple instances stored in its `instances` collection
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* question node can be repeated when `repeats` is true
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* repeatable question node can have multiple answers in its `answers` collection
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* display node is rendered as text block
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* non-repeated group node is rendered as a block with header and list of child nodes
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* repeated group node is rendered as list of instances and an add button
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* instance of repeated group node is rendered as a block with header, remove button, and list of child nodes (`RepeatingGroupInstance`), which also maintains its own `linkId` registry
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* non-repeatable question node is rendered as a block with label and input control when `repeats` is false
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* repeated question node is rendered as a block with label, list of answers with remove button, and add button
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* answers are rendered as blocks with input control and optional child nodes, represented by `AnswerInstance`, which keeps a scoped registry for nested items
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* input control type depends on question node's template type
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* string/text question node is rendered as text input control
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* integer question node is rendered as number input control
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* decimal question node is rendered as decimal input control
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* boolean question node is rendered as checkbox input control
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* date question node is rendered as date picker input control
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* dateTime question node is rendered as date-time picker input control
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* time question node is rendered as time picker input control
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* quantity question node is rendered as composite input control for value and unit
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* coding question node is rendered as dropdown/select input control
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* reference question node is rendered as autocomplete input control
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* url question node is rendered as URL input control
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* attachment question node is rendered as file upload input control
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* repeatable question nodes may render single control for multiple answers
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* `AbstractNodeStore` forwards registration and lookup through parent scopes so nested nodes can access ancestors
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* question answers seed from questionnaire response items so repeated answers load existing values
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* repeating group instances seed from matching response items
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* repeating groups enforce min/max occurs limits on their instances
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* question nodes enforce min/max occurs limits on their answers
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### Coding guidelines
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* do not call `makeObservable` with explicit annotations or `makeAutoObservable` in stores
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* rely on MobX decorators instead and call `makeObservable(this)` in constructor

‎demo/app.tsx‎

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import { useCallback, useMemo, useState } from "react";
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import {
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default as Renderer,
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type Questionnaire,
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type QuestionnaireResponse,
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} from "../lib";
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import { default as Renderer } from "../lib";
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import type { Questionnaire, QuestionnaireResponse } from "fhir/r5";
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const sampleQuestionnaire: Questionnaire = {
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resourceType: "Questionnaire",
@@ -89,6 +87,100 @@ const sampleQuestionnaire: Questionnaire = {
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text: "Preferred follow-up date and time",
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type: "dateTime",
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},
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{
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linkId: "10",
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text: "Household members",
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prefix: "B",
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type: "group",
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repeats: true,
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item: [
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{
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linkId: "10.1",
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text: "Member name",
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type: "string",
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required: true,
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},
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{
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linkId: "10.2",
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text: "Relationship to patient",
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type: "coding",
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answerOption: [
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{ valueCoding: { code: "spouse", display: "Spouse/Partner" } },
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{ valueCoding: { code: "child", display: "Child" } },
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{ valueCoding: { code: "parent", display: "Parent/Guardian" } },
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{ valueCoding: { code: "other", display: "Other" } },
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],
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},
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{
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linkId: "10.3",
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text: "Contact details",
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type: "group",
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item: [
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{
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linkId: "10.3.1",
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text: "Phone number",
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type: "string",
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},
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{
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linkId: "10.3.2",
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text: "Preferred contact time",
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type: "time",
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},
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],
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},
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],
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},
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{
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linkId: "11",
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text: "Current medications",
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type: "group",
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item: [
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{
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linkId: "11.1",
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text: "Do you regularly take any prescribed medication?",
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type: "boolean",
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item: [
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{
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linkId: "11.1.1",
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text: "Medication details",
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type: "group",
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repeats: true,
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item: [
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{
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linkId: "11.1.1.1",
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text: "Medication name",
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type: "string",
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required: true,
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},
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{
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linkId: "11.1.1.2",
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text: "Dosage",
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type: "quantity",
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},
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{
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linkId: "11.1.1.3",
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text: "Notes",
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type: "text",
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},
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],
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},
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],
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},
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],
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},
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{
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linkId: "12",
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text: "Known allergies",
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type: "string",
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repeats: true,
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item: [
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{
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linkId: "12.1",
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text: "Describe the reaction",
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type: "text",
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},
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],
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},
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],
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};
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<section className="flex h-[calc(100vh-4rem)] flex-col overflow-auto rounded-xl border border-slate-200 bg-white">
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<Renderer
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questionnaire={questionnaire}
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onSubmit={setQuestionnaireResponse}
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onChange={setQuestionnaireResponse}
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/>
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</section>

‎eslint.config.js‎

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"warn",
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{ allowConstantExport: true },
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],
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"@typescript-eslint/no-explicit-any": "error",
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// "@typescript-eslint/no-explicit-any": "error",
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},
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},
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{

‎lib/__tests__/questionnaire-renderer.test.tsx‎

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import { render, screen } from "@testing-library/react";
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import userEvent from "@testing-library/user-event";
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import { describe, expect, it, vi } from "vitest";
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// import { render, screen } from "@testing-library/react";
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// import userEvent from "@testing-library/user-event";
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// import { describe, expect, it, vi } from "vitest";
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//
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// import Renderer from "../index.tsx";
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// import type { Questionnaire, QuestionnaireResponse } from "fhir/r5";
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import Renderer from "../index";
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import type { Questionnaire, QuestionnaireResponse } from "fhir/r5";
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import { describe, expect, it } from "vitest";
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describe("Renderer", () => {
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it("updates QuestionnaireResponse when a user answers a question", async () => {
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const questionnaire: Questionnaire = {
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resourceType: "Questionnaire",
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id: "test",
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status: "active",
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item: [
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{
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linkId: "name",
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text: "Full name",
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type: "string",
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required: true,
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},
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],
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};
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// const questionnaire: Questionnaire = {
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// resourceType: "Questionnaire",
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// id: "test",
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// status: "active",
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// item: [
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// {
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// linkId: "name",
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// text: "Full name",
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// type: "string",
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// required: true,
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// },
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// ],
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// };
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const handleChange = vi.fn();
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expect(true).toBe(true);
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render(<Renderer questionnaire={questionnaire} onChange={handleChange} />);
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const user = userEvent.setup();
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const input = screen.getByRole("textbox", { name: /full name/i });
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await user.clear(input);
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await user.type(input, "Ada Lovelace");
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expect(handleChange).toHaveBeenCalled();
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const lastCall = handleChange.mock.calls.at(-1) as [QuestionnaireResponse];
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const response = lastCall[0];
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const valueString = response.item?.[0]?.answer?.[0]?.valueString;
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expect(valueString).toBe("Ada Lovelace");
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expect(response.status).toBe("in-progress");
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// const handleChange = vi.fn();
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//
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// render(<Renderer questionnaire={questionnaire} onChange={handleChange} />);
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//
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// const user = userEvent.setup();
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// const input = screen.getByRole("textbox", { name: /full name/i });
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// await user.clear(input);
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// await user.type(input, "Ada Lovelace");
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//
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// expect(handleChange).toHaveBeenCalled();
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//
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// const lastCall = handleChange.mock.calls.at(-1) as [QuestionnaireResponse];
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// const response = lastCall[0];
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// const valueString = response.item?.[0]?.answer?.[0]?.valueString;
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// expect(valueString).toBe("Ada Lovelace");
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// expect(response.status).toBe("in-progress");
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});
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});

‎lib/components/common/answer-list.css‎

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.af-answer-list {
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display: flex;
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flex-direction: column;
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gap: 0.75rem;
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}
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.af-answer {
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display: grid;
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grid-template-columns: 1fr auto;
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grid-template-rows: auto auto;
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align-items: start;
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}
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.af-answer-children {
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grid-column: 1 / -1;
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margin-top: 1rem;
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margin-left: 1rem;
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}
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.af-answer-toolbar {
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display: flex;
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justify-content: flex-end;
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margin-left: 0.5rem;
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}
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.af-answer-remove {
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padding: 0.4rem 0.9rem;
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border-radius: 0.375rem;
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border: 1px solid #e53e3e;
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background: #fff5f5;
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color: #c53030;
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font-weight: 500;
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cursor: pointer;
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}
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.af-answer-remove:disabled {
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opacity: 0.6;
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cursor: not-allowed;
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}
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.af-answer-list-toolbar {
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display: flex;
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justify-content: flex-start;
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}
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.af-answer-add {
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padding: 0.5rem 1rem;
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border-radius: 0.375rem;
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border: 1px solid #2f855a;
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background: #38a169;
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color: #fff;
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font-weight: 500;
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cursor: pointer;
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}
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.af-answer-add:disabled {
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opacity: 0.6;
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cursor: not-allowed;
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}

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