From 18df6376173213c7dc789b5ce1ac480b91a13e2a Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>
Date: Thu, 11 Jul 2024 21:33:13 +0000
Subject: [PATCH 1/2] Move shebang check into the same branch as other `#`
 cases.

---
 src/compiler/scanner.ts | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/src/compiler/scanner.ts b/src/compiler/scanner.ts
index fe0a99d86488b..ac340e3ce9e35 100644
--- a/src/compiler/scanner.ts
+++ b/src/compiler/scanner.ts
@@ -1882,18 +1882,6 @@ export function createScanner(languageVersion: ScriptTarget, skipTrivia: boolean
             }
 
             const ch = codePointUnchecked(pos);
-            if (pos === 0) {
-                // Special handling for shebang
-                if (ch === CharacterCodes.hash && isShebangTrivia(text, pos)) {
-                    pos = scanShebangTrivia(text, pos);
-                    if (skipTrivia) {
-                        continue;
-                    }
-                    else {
-                        return token = SyntaxKind.ShebangTrivia;
-                    }
-                }
-            }
 
             switch (ch) {
                 case CharacterCodes.lineFeed:
@@ -2302,13 +2290,24 @@ export function createScanner(languageVersion: ScriptTarget, skipTrivia: boolean
                     pos++;
                     return token = SyntaxKind.Unknown;
                 case CharacterCodes.hash:
-                    if (pos !== 0 && text[pos + 1] === "!") {
-                        error(Diagnostics.can_only_be_used_at_the_start_of_a_file, pos, 2);
-                        pos++;
-                        return token = SyntaxKind.Unknown;
+                    // Special handling for shebang
+                    const charAfterHash = codePointUnchecked(pos + 1);
+                    if (charAfterHash === CharacterCodes.exclamation) {
+                        if (pos !== 0) {
+                            error(Diagnostics.can_only_be_used_at_the_start_of_a_file, pos, 2);
+                            pos++;
+                            return token = SyntaxKind.Unknown;
+                        }
+
+                        pos = scanShebangTrivia(text, pos);
+                        if (skipTrivia) {
+                            continue;
+                        }
+                        else {
+                            return token = SyntaxKind.ShebangTrivia;
+                        }
                     }
 
-                    const charAfterHash = codePointUnchecked(pos + 1);
                     if (charAfterHash === CharacterCodes.backslash) {
                         pos++;
                         const extendedCookedChar = peekExtendedUnicodeEscape();

From bc21cdd7bc6d130b51fe95793ec0269bd1b873a0 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>
Date: Thu, 11 Jul 2024 21:49:29 +0000
Subject: [PATCH 2/2] Add a quicker check for identifiers, check for space
 sooner.

---
 src/compiler/scanner.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/compiler/scanner.ts b/src/compiler/scanner.ts
index ac340e3ce9e35..ddad2d234d667 100644
--- a/src/compiler/scanner.ts
+++ b/src/compiler/scanner.ts
@@ -1883,6 +1883,11 @@ export function createScanner(languageVersion: ScriptTarget, skipTrivia: boolean
 
             const ch = codePointUnchecked(pos);
 
+            if (CharacterCodes.a <= (ch | 32) && (ch | 32) <= CharacterCodes.z) {
+                const identifierKind = scanIdentifier(ch, languageVersion);
+                return identifierKind!;
+            }
+
             switch (ch) {
                 case CharacterCodes.lineFeed:
                 case CharacterCodes.carriageReturn:
@@ -1901,10 +1906,10 @@ export function createScanner(languageVersion: ScriptTarget, skipTrivia: boolean
                         }
                         return token = SyntaxKind.NewLineTrivia;
                     }
+                case CharacterCodes.space:
                 case CharacterCodes.tab:
                 case CharacterCodes.verticalTab:
                 case CharacterCodes.formFeed:
-                case CharacterCodes.space:
                 case CharacterCodes.nonBreakingSpace:
                 case CharacterCodes.ogham:
                 case CharacterCodes.enQuad: