Fix: isSpaceBetweenTokens() recognizes spaces in JSXText (fixes #12614)

lib/source-code/source-code.js

@@ -447,7 +447,19 @@ class SourceCode extends TokenStore {
         while (currentToken !== finalToken) {
             const nextToken = this.getTokenAfter(currentToken, { includeComments: true });
 
-            if (currentToken.range[1] !== nextToken.range[0]) {
+            if (
+                currentToken.range[1] !== nextToken.range[0] ||
+
+                /*
+                 * For backward compatibility, check speces in JSXText.
+                 * https://github.com/eslint/eslint/issues/12614
+                 */
+                (
+                    nextToken !== finalToken &&
+                    nextToken.type === "JSXText" &&
+                    /\s/u.test(nextToken.value)
+                )
+            ) {
                 return true;
             }
 

tests/lib/source-code/source-code.js

@@ -2225,6 +2225,47 @@ describe("SourceCode", () => {
                     });
                 });
             });
+
+            it("JSXText tokens that contain only whitespaces should be handled as space", () => {
+                const code = "let jsx = <div>\n   {content}\n</div>";
+                const ast = espree.parse(code, { ...DEFAULT_CONFIG, ecmaFeatures: { jsx: true } });
+                const sourceCode = new SourceCode(code, ast);
+                const jsx = ast.body[0].declarations[0].init;
+                const interpolation = jsx.children[1];
+
+                assert.strictEqual(
+                    sourceCode.isSpaceBetweenTokens(jsx.openingElement, interpolation),
+                    true
+                );
+                assert.strictEqual(
+                    sourceCode.isSpaceBetweenTokens(interpolation, jsx.closingElement),
+                    true
+                );
+            });
+
+            it("JSXText tokens that contain both letters and whitespaces should be handled as space", () => {
+                const code = "let jsx = <div>\n   Hello\n</div>";
+                const ast = espree.parse(code, { ...DEFAULT_CONFIG, ecmaFeatures: { jsx: true } });
+                const sourceCode = new SourceCode(code, ast);
+                const jsx = ast.body[0].declarations[0].init;
+
+                assert.strictEqual(
+                    sourceCode.isSpaceBetweenTokens(jsx.openingElement, jsx.closingElement),
+                    true
+                );
+            });
+
+            it("JSXText tokens that contain only letters should NOT be handled as space", () => {
+                const code = "let jsx = <div>Hello</div>";
+                const ast = espree.parse(code, { ...DEFAULT_CONFIG, ecmaFeatures: { jsx: true } });
+                const sourceCode = new SourceCode(code, ast);
+                const jsx = ast.body[0].declarations[0].init;
+
+                assert.strictEqual(
+                    sourceCode.isSpaceBetweenTokens(jsx.openingElement, jsx.closingElement),
+                    false
+                );
+            });
         });
 
         describe("should return true when there is at least one whitespace character between a token and a node", () => {