feat: enable Knip's treatConfigHintsAsErrors

Author: JoshuaKGoldberg

knip.json

@@ -8,5 +8,6 @@
 		"trash-cli"
 	],
 	"ignoreExportsUsedInFile": { "interface": true, "type": true },
+	"treatConfigHintsAsErrors": true,
 	"project": ["src/**/*.ts"]
 }

src/blocks/blockKnip.test.ts

@@ -69,7 +69,7 @@ describe("blockKnip", () => {
 			    },
 			  ],
 			  "files": {
-			    "knip.json": "{"$schema":"https://unpkg.com/[email protected]/schema.json","ignoreExportsUsedInFile":{"interface":true,"type":true}}",
+			    "knip.json": "{"$schema":"https://unpkg.com/[email protected]/schema.json","ignoreExportsUsedInFile":{"interface":true,"type":true},"treatConfigHintsAsErrors":true}",
 			  },
 			}
 		`);
@@ -140,7 +140,7 @@ describe("blockKnip", () => {
 			    },
 			  ],
 			  "files": {
-			    "knip.json": "{"$schema":"https://unpkg.com/[email protected]/schema.json","entry":["src/index.ts"],"ignoreDependencies":["abc","def"],"ignoreExportsUsedInFile":{"interface":true,"type":true},"project":["src/**/*.ts"]}",
+			    "knip.json": "{"$schema":"https://unpkg.com/[email protected]/schema.json","entry":["src/index.ts"],"ignoreDependencies":["abc","def"],"ignoreExportsUsedInFile":{"interface":true,"type":true},"treatConfigHintsAsErrors":true,"project":["src/**/*.ts"]}",
 			  },
 			}
 		`);
@@ -216,7 +216,7 @@ describe("blockKnip", () => {
 			    },
 			  ],
 			  "files": {
-			    "knip.json": "{"$schema":"https://unpkg.com/[email protected]/schema.json","ignoreExportsUsedInFile":{"interface":true,"type":true}}",
+			    "knip.json": "{"$schema":"https://unpkg.com/[email protected]/schema.json","ignoreExportsUsedInFile":{"interface":true,"type":true},"treatConfigHintsAsErrors":true}",
 			  },
 			}
 		`);

src/blocks/blockKnip.ts

@@ -81,6 +81,7 @@ export const blockKnip = base.createBlock({
 						interface: true,
 						type: true,
 					},
+					treatConfigHintsAsErrors: true,
 					project: project?.sort(),
 				}),
 			},