feat: add intake method to blockVitest (#2079)

## PR Checklist

- [x] Addresses an existing open issue: fixes #2077
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/create-typescript-app/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/create-typescript-app/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

Attempts to parse the `{}` inside `defineConfig(...)` with
[JSON5](http://npmjs.com/package/json5), allowing comments and unquoted
object keys.

🎁

Author: JoshuaKGoldberg

package.json

@@ -51,6 +51,7 @@
 		"input-from-file-json": "^0.5.4",
 		"input-from-script": "^0.5.4",
 		"js-yaml": "^4.1.0",
+		"json5": "^2.2.3",
 		"lazy-value": "^3.0.0",
 		"lodash": "^4.17.21",
 		"npm-user": "^6.1.1",

pnpm-lock.yaml

@@ -1,5 +1,5 @@
-import { testBlock } from "bingo-stratum-testers";
-import { describe, expect, test, vi } from "vitest";
+import { testBlock, testIntake } from "bingo-stratum-testers";
+import { describe, expect, it, test, vi } from "vitest";
 
 import { blockVitest } from "./blockVitest.js";
 import { optionsBase } from "./options.fakes.js";
@@ -759,4 +759,111 @@ describe("blockVitest", () => {
 			}
 		`);
 	});
+
+	describe("intake", () => {
+		it("returns undefined when vitest.config.ts does not exist", () => {
+			const actual = testIntake(blockVitest, {
+				files: {
+					src: {},
+				},
+			});
+
+			expect(actual).toEqual(undefined);
+		});
+
+		it("returns undefined when vitest.config.ts does not contain the expected defineConfig", () => {
+			const actual = testIntake(blockVitest, {
+				files: {
+					"vitest.config.ts": [`invalid`],
+				},
+			});
+
+			expect(actual).toEqual(undefined);
+		});
+
+		it("returns undefined when vitest.config.ts passes a non-object to defineConfig", () => {
+			const actual = testIntake(blockVitest, {
+				files: {
+					"vitest.config.ts": [`defineConfig("invalid")`],
+				},
+			});
+
+			expect(actual).toEqual(undefined);
+		});
+
+		it("returns undefined when vitest.config.ts does not pass a test to defineConfig", () => {
+			const actual = testIntake(blockVitest, {
+				files: {
+					"vitest.config.ts": [`defineConfig({ other: true })`],
+				},
+			});
+
+			expect(actual).toEqual(undefined);
+		});
+
+		it("returns undefined when vitest.config.ts passes unknown test data to defineConfig", () => {
+			const actual = testIntake(blockVitest, {
+				files: {
+					"vitest.config.ts": [`defineConfig({ test: true })`],
+				},
+			});
+
+			expect(actual).toEqual(undefined);
+		});
+
+		it("returns undefined when vitest.config.ts passes invalid test syntax to defineConfig", () => {
+			const actual = testIntake(blockVitest, {
+				files: {
+					"vitest.config.ts": [`defineConfig({ test: { ! } })`],
+				},
+			});
+
+			expect(actual).toEqual(undefined);
+		});
+
+		it("returns undefined when vitest.config.ts passes invalid test data to defineConfig", () => {
+			const actual = testIntake(blockVitest, {
+				files: {
+					"vitest.config.ts": [
+						`defineConfig({ test: { coverage: 'invalid' } })`,
+					],
+				},
+			});
+
+			expect(actual).toEqual(undefined);
+		});
+
+		it("returns coverage and exclude when they exist in vitest.config.ts", () => {
+			const actual = testIntake(blockVitest, {
+				files: {
+					"vitest.config.ts": [
+						`import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+	test: {
+		clearMocks: true,
+		coverage: {
+			all: true,
+			exclude: ["src/index.ts"],
+			include: ["src", "other"],
+			reporter: ["html", "lcov"],
+		},
+		exclude: ["lib", "node_modules"],
+		setupFiles: ["console-fail-test/setup"],
+	},
+});
+`,
+					],
+				},
+			});
+
+			expect(actual).toEqual({
+				coverage: {
+					exclude: ["src/index.ts"],
+					include: ["src", "other"],
+				},
+				exclude: ["lib", "node_modules"],
+			});
+		});
+	});
 });

src/blocks/blockVitest.test.ts

@@ -1,3 +1,4 @@
+import JSON5 from "json5";
 import { z } from "zod";
 
 import { base } from "../base.js";
@@ -15,22 +16,66 @@ import { blockRemoveFiles } from "./blockRemoveFiles.js";
 import { blockRemoveWorkflows } from "./blockRemoveWorkflows.js";
 import { blockTSup } from "./blockTSup.js";
 import { blockVSCode } from "./blockVSCode.js";
+import { intakeFile } from "./intake/intakeFile.js";
+
+function tryParseJSON5(text: string) {
+	try {
+		// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion
+		return JSON5.parse(text) as Record<string, unknown> | undefined;
+	} catch {
+		return undefined;
+	}
+}
+
+const zCoverage = z.object({
+	exclude: z.array(z.string()).optional(),
+	include: z.array(z.string()).optional(),
+});
+
+const zExclude = z.array(z.string());
+
+const zTest = z.object({
+	coverage: zCoverage,
+	exclude: zExclude,
+});
 
 export const blockVitest = base.createBlock({
 	about: {
 		name: "Vitest",
 	},
 	addons: {
 		actionSteps: z.array(zActionStep).default([]),
-		coverage: z
-			.object({
-				exclude: z.array(z.string()).optional(),
-				include: z.array(z.string()).optional(),
-			})
-			.default({}),
-		exclude: z.array(z.string()).default([]),
+		coverage: zCoverage.default({}),
+		exclude: zExclude.default([]),
 		flags: z.array(z.string()).default([]),
 	},
+	intake({ files }) {
+		const file = intakeFile(files, ["vitest.config.ts"]);
+		if (!file) {
+			return undefined;
+		}
+
+		const normalized = file[0].replaceAll(/[\n\r]/g, "");
+		const matched = /defineConfig\(\{(.+)\}\)\s*(?:;\s*)?$/u.exec(normalized);
+		if (!matched) {
+			return undefined;
+		}
+
+		const rawData = tryParseJSON5(`{${matched[1]}}`);
+		if (typeof rawData !== "object" || typeof rawData.test !== "object") {
+			return undefined;
+		}
+
+		const parsedData = zTest.safeParse(rawData.test).data;
+		if (!parsedData) {
+			return undefined;
+		}
+
+		return {
+			coverage: parsedData.coverage,
+			exclude: parsedData.exclude,
+		};
+	},
 	produce({ addons }) {
 		const { actionSteps, coverage, exclude = [] } = addons;
 		const excludeText = JSON.stringify(exclude);