Make it work, kinda

packages/eslint-plugin/src/rules/expect.ts

@@ -69,10 +69,10 @@ Then re-run.`,
           reportDiagnostics = false;
         }
 
-        const tsconfigs = ["tsconfig.json"];
+        let tsconfigs: readonly string[] = ["tsconfig.json"];
         let reportTsconfigName = false;
-        if (settings.extraTsconfigs) {
-          tsconfigs.push(...settings.extraTsconfigs);
+        if (settings.tsconfigs) {
+          tsconfigs = settings.tsconfigs;
           reportTsconfigName = true;
         }
 
@@ -148,7 +148,7 @@ interface VersionToTest {
 
 interface Settings {
   readonly versionsToTest?: readonly VersionToTest[];
-  readonly extraTsconfigs?: readonly string[];
+  readonly tsconfigs?: readonly string[];
 }
 
 function getSettings(context: Parameters<(typeof rule)["create"]>[0]): Settings {
@@ -168,18 +168,18 @@ function getSettings(context: Parameters<(typeof rule)["create"]>[0]): Settings
     }
   }
 
-  const extraTsconfigs = (dt as Record<string, unknown>).extraTsconfigs ?? undefined;
-  if (extraTsconfigs !== undefined && !Array.isArray(extraTsconfigs)) {
-    throw new Error("Invalid extraTsconfigs");
+  const tsconfigs = (dt as Record<string, unknown>).tsconfigs ?? undefined;
+  if (tsconfigs !== undefined && !Array.isArray(tsconfigs)) {
+    throw new Error("Invalid tsconfigs");
   }
 
-  for (const tsconfig of extraTsconfigs ?? []) {
+  for (const tsconfig of tsconfigs ?? []) {
     if (typeof tsconfig !== "string") {
       throw new Error("Invalid extra tsconfig");
     }
   }
 
-  return { versionsToTest, extraTsconfigs };
+  return { versionsToTest, tsconfigs };
 }
 
 const programCache = new WeakMap<ts.Program, Map<VersionAndTsconfig, ts.Program>>();

packages/eslint-plugin/test/__file_snapshots__/types/expect-tsconfigs/expect-dom-tests.ts.lint

@@ -0,0 +1,8 @@
+No errors
+
+==== types/expect-tsconfigs/expect-dom-tests.ts ====
+
+    // eslint-disable-next-line @definitelytyped/no-relative-import-in-test
+    import * as expect from "./";
+
+    const element: HTMLElement = expect.element;

packages/eslint-plugin/test/__file_snapshots__/types/expect-tsconfigs/expect-tests.ts.lint

@@ -0,0 +1,15 @@
+types/expect-tsconfigs/expect-tests.ts
+  4:16  error  [email protected]:tsconfig.no-dom.json compile error: 
+Cannot find name 'HTMLElement'  @definitelytyped/expect
+
+✖ 1 problem (1 error, 0 warnings)
+
+==== types/expect-tsconfigs/expect-tests.ts ====
+
+    // eslint-disable-next-line @definitelytyped/no-relative-import-in-test
+    import * as expect from "./";
+
+    const element: HTMLElement = expect.element;
+                   ~~~~~~~~~~~
+!!! @definitelytyped/expect: [email protected]:tsconfig.no-dom.json compile error: 
+!!!                        : Cannot find name 'HTMLElement'.

packages/eslint-plugin/test/__file_snapshots__/types/expect-tsconfigs/index.d.ts.lint

@@ -0,0 +1,12 @@
+types/expect-tsconfigs/index.d.ts
+  1:23  error  [email protected]:tsconfig.no-dom.json compile error: 
+Cannot find name 'HTMLElement'  @definitelytyped/expect
+
+✖ 1 problem (1 error, 0 warnings)
+
+==== types/expect-tsconfigs/index.d.ts ====
+
+    export const element: HTMLElement;
+                          ~~~~~~~~~~~
+!!! @definitelytyped/expect: [email protected]:tsconfig.no-dom.json compile error: 
+!!!                        : Cannot find name 'HTMLElement'.

packages/eslint-plugin/test/fixtures/types/expect-tsconfigs/.eslintrc.json

@@ -0,0 +1,8 @@
+{
+    "settings": {
+        "dt": {
+            "versionsToTest": [{ "versionName": "x.y", "path": "typescript" }],
+            "tsconfigs": ["tsconfig.dom.json", "tsconfig.no-dom.json"]
+        }
+    }
+}

packages/eslint-plugin/test/fixtures/types/expect-tsconfigs/expect-dom-tests.ts

@@ -0,0 +1,4 @@
+// eslint-disable-next-line @definitelytyped/no-relative-import-in-test
+import * as expect from "./";
+
+const element: HTMLElement = expect.element;

packages/eslint-plugin/test/fixtures/types/expect-tsconfigs/expect-tests.ts

@@ -0,0 +1,4 @@
+// eslint-disable-next-line @definitelytyped/no-relative-import-in-test
+import * as expect from "./";
+
+const element: HTMLElement = expect.element;

packages/eslint-plugin/test/fixtures/types/expect-tsconfigs/index.d.ts

@@ -0,0 +1 @@
+export const element: HTMLElement;

packages/eslint-plugin/test/fixtures/types/expect-tsconfigs/package.json

@@ -0,0 +1,5 @@
+{
+    "name": "@types/expect",
+    "version": "2.0.9999",
+    "owners": []
+}

packages/eslint-plugin/test/fixtures/types/expect-tsconfigs/tsconfig.dom.json

@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "expect-dom-tests.ts"
+    ]
+}

packages/eslint-plugin/test/fixtures/types/expect-tsconfigs/tsconfig.json

@@ -0,0 +1,21 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "expect-tests.ts",
+        "expect-dom-tests.ts"
+    ]
+}

packages/eslint-plugin/test/fixtures/types/expect-tsconfigs/tsconfig.no-dom.json

@@ -0,0 +1,19 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "expect-tests.ts"
+    ]
+}