Fix poor error span for unclosed JSX tags in the presence of whitespace/comments (microsoft#37419)

* Improve jsx tag error span

* Move solution to parseJsxChild func

* Add tests and update baselines

* Update comment in src/compiler/parser.ts

Co-Authored-By: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>

* Use skipTrivia to check for whitespaces and other trivia

* Import React into  errorSpanForUnclosedJsxTag.tsx

* .

* .

Co-authored-by: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>

Author: AGMETEOR

src/compiler/parser.ts

@@ -4545,7 +4545,11 @@ namespace ts {
                         parseErrorAtRange(openingTag, Diagnostics.JSX_fragment_has_no_corresponding_closing_tag);
                     }
                     else {
-                        parseErrorAtRange(openingTag.tagName, Diagnostics.JSX_element_0_has_no_corresponding_closing_tag, getTextOfNodeFromSourceText(sourceText, openingTag.tagName));
+                        // We want the error span to cover only 'Foo.Bar' in < Foo.Bar >
+                        // or to cover only 'Foo' in < Foo >
+                        const tag = openingTag.tagName;
+                        const start = skipTrivia(sourceText, tag.pos);
+                        parseErrorAt(start, tag.end, Diagnostics.JSX_element_0_has_no_corresponding_closing_tag, getTextOfNodeFromSourceText(sourceText, openingTag.tagName));
                     }
                     return undefined;
                 case SyntaxKind.LessThanSlashToken:

tests/baselines/reference/errorSpanForUnclosedJsxTag.errors.txt

@@ -0,0 +1,23 @@
+tests/cases/compiler/errorSpanForUnclosedJsxTag.tsx(9,14): error TS17008: JSX element 'Foo.Bar' has no corresponding closing tag.
+tests/cases/compiler/errorSpanForUnclosedJsxTag.tsx(11,13): error TS17008: JSX element 'Baz' has no corresponding closing tag.
+tests/cases/compiler/errorSpanForUnclosedJsxTag.tsx(11,23): error TS1005: '</' expected.
+
+
+==== tests/cases/compiler/errorSpanForUnclosedJsxTag.tsx (3 errors) ====
+    declare const React: any
+    
+    let Foo = {
+      Bar() {}
+    }
+    
+    let Baz = () => {}
+    
+    let x = <    Foo.Bar >Hello
+                 ~~~~~~~
+!!! error TS17008: JSX element 'Foo.Bar' has no corresponding closing tag.
+    
+    let y = <   Baz >Hello
+                ~~~
+!!! error TS17008: JSX element 'Baz' has no corresponding closing tag.
+                          
+!!! error TS1005: '</' expected.

tests/baselines/reference/errorSpanForUnclosedJsxTag.js

@@ -0,0 +1,21 @@
+//// [errorSpanForUnclosedJsxTag.tsx]
+declare const React: any
+
+let Foo = {
+  Bar() {}
+}
+
+let Baz = () => {}
+
+let x = <    Foo.Bar >Hello
+
+let y = <   Baz >Hello
+
+//// [errorSpanForUnclosedJsxTag.js]
+var Foo = {
+    Bar: function () { }
+};
+var Baz = function () { };
+var x = React.createElement(Foo.Bar, null,
+    "Hello let y = ",
+    React.createElement(Baz, null, "Hello"));

tests/baselines/reference/errorSpanForUnclosedJsxTag.symbols

@@ -0,0 +1,23 @@
+=== tests/cases/compiler/errorSpanForUnclosedJsxTag.tsx ===
+declare const React: any
+>React : Symbol(React, Decl(errorSpanForUnclosedJsxTag.tsx, 0, 13))
+
+let Foo = {
+>Foo : Symbol(Foo, Decl(errorSpanForUnclosedJsxTag.tsx, 2, 3))
+
+  Bar() {}
+>Bar : Symbol(Bar, Decl(errorSpanForUnclosedJsxTag.tsx, 2, 11))
+}
+
+let Baz = () => {}
+>Baz : Symbol(Baz, Decl(errorSpanForUnclosedJsxTag.tsx, 6, 3))
+
+let x = <    Foo.Bar >Hello
+>x : Symbol(x, Decl(errorSpanForUnclosedJsxTag.tsx, 8, 3))
+>Foo.Bar : Symbol(Bar, Decl(errorSpanForUnclosedJsxTag.tsx, 2, 11))
+>Foo : Symbol(Foo, Decl(errorSpanForUnclosedJsxTag.tsx, 2, 3))
+>Bar : Symbol(Bar, Decl(errorSpanForUnclosedJsxTag.tsx, 2, 11))
+
+let y = <   Baz >Hello
+>Baz : Symbol(Baz, Decl(errorSpanForUnclosedJsxTag.tsx, 6, 3))
+

tests/baselines/reference/errorSpanForUnclosedJsxTag.types

@@ -0,0 +1,29 @@
+=== tests/cases/compiler/errorSpanForUnclosedJsxTag.tsx ===
+declare const React: any
+>React : any
+
+let Foo = {
+>Foo : { Bar(): void; }
+>{  Bar() {}} : { Bar(): void; }
+
+  Bar() {}
+>Bar : () => void
+}
+
+let Baz = () => {}
+>Baz : () => void
+>() => {} : () => void
+
+let x = <    Foo.Bar >Hello
+>x : any
+><    Foo.Bar >Hellolet y = <   Baz >Hello : any
+>Foo.Bar : () => void
+>Foo : { Bar(): void; }
+>Bar : () => void
+
+let y = <   Baz >Hello
+><   Baz >Hello : any
+>Baz : () => void
+> : any
+> : any
+

tests/cases/compiler/errorSpanForUnclosedJsxTag.tsx

@@ -0,0 +1,12 @@
+// @jsx: react
+declare const React: any
+
+let Foo = {
+  Bar() {}
+}
+
+let Baz = () => {}
+
+let x = <    Foo.Bar >Hello
+
+let y = <   Baz >Hello