fix(valid-title): Accept string variables as a valid title

Fixes #295
Fixes #243
Fixes #312
Fixes #320

I give in, I've got enough reports of this from users I'm tired of
dealing with it and decided to just support basic semantic analysis. No
doubt at some point someone is going to expect it to work with full type
information cause they'll have some weird use case where they import
some title string function from a util or something dumb like that, but
at least this will quell the nonsense for most simple cases.

docs/rules/valid-title.md

@@ -46,13 +46,19 @@ test(123, () => {})
 test.describe(String(/.+/), () => {})
 test.describe(myFunction, () => {})
 test.describe(6, function () {})
+
+const title = 123
+test(title, () => {})
 ```
 
 Examples of **correct** code for this rule:
 
 ```javascript
 test('is a string', () => {})
 test.describe('is a string', () => {})
+
+const title = 'is a string'
+test(title, () => {})
 ```
 
 Examples of **correct** code when `ignoreTypeOfDescribeName` is `true`:

src/rules/valid-title.test.ts

@@ -607,17 +607,6 @@ runRuleTester('title-must-be-string', rule, {
       ],
       options: [{ ignoreTypeOfTestName: false }],
     },
-    {
-      code: 'const foo = "my-title"; test(foo, () => {});',
-      errors: [
-        {
-          column: 30,
-          line: 1,
-          messageId: 'titleMustBeString',
-        },
-      ],
-      options: [{ ignoreTypeOfTestName: false }],
-    },
     {
       code: 'test(123, () => {});',
       errors: [
@@ -731,6 +720,22 @@ runRuleTester('title-must-be-string', rule, {
       ],
       options: [{ ignoreTypeOfStepName: false }],
     },
+    // Basic semantic analysis
+    {
+      code: javascript`
+        const title = 123;
+        test(title, () => {
+          expect(1).toBe(1);
+        });
+      `,
+      errors: [
+        {
+          column: 15,
+          line: 1,
+          messageId: 'titleMustBeString',
+        },
+      ],
+    },
     // Global aliases
     {
       code: 'it(String(/.+/), () => {});',
@@ -768,10 +773,6 @@ runRuleTester('title-must-be-string', rule, {
       code: 'test(String(/.+/), () => {});',
       options: [{ ignoreTypeOfTestName: true }],
     },
-    {
-      code: 'const foo = "my-title"; test(foo, () => {});',
-      options: [{ ignoreTypeOfTestName: true }],
-    },
     {
       code: 'test.describe(myFunction, () => {});',
       options: [{ ignoreTypeOfDescribeName: true }],
@@ -780,6 +781,23 @@ runRuleTester('title-must-be-string', rule, {
       code: 'test.describe(skipFunction, () => {});',
       options: [{ disallowedWords: [], ignoreTypeOfDescribeName: true }],
     },
+    // Basic semantic analysis
+    {
+      code: 'const foo = "my-title"; test(foo, () => {});',
+      options: [{ ignoreTypeOfTestName: true }],
+    },
+    {
+      code: 'const foo = "my-title"; test(foo, () => {});',
+      options: [{ ignoreTypeOfTestName: false }],
+    },
+    {
+      code: javascript`
+        const title = "is a string";
+        test(title, () => {
+          expect(1).toBe(1);
+        });
+      `,
+    },
     // Global aliases
     {
       code: 'it("is a string", () => {});',

src/rules/valid-title.ts

@@ -1,5 +1,10 @@
 import ESTree from 'estree'
-import { getStringValue, isStringNode, StringNode } from '../utils/ast'
+import {
+  dereference,
+  getStringValue,
+  isStringNode,
+  StringNode,
+} from '../utils/ast'
 import { createRule } from '../utils/createRule'
 import { parseFnCall } from '../utils/parseFnCall'
 
@@ -118,9 +123,12 @@ export default createRule({
           return
         }
 
-        const [argument] = node.arguments
+        let argument: ESTree.Node = node.arguments[0]
         if (!argument) return
 
+        // Attempt to dereference the argument if it's a variable
+        argument = dereference(context, argument) ?? argument
+
         if (!isStringNode(argument)) {
           if (
             argument.type === 'BinaryExpression' &&