diff --git a/crates/oxc_isolated_declarations/src/types.rs b/crates/oxc_isolated_declarations/src/types.rs
index 7402629ac34ba..dd95697882560 100644
--- a/crates/oxc_isolated_declarations/src/types.rs
+++ b/crates/oxc_isolated_declarations/src/types.rs
@@ -8,7 +8,7 @@ use oxc_ast::{
     },
 };
 use oxc_span::{ContentEq, GetSpan, SPAN, Span};
-use oxc_syntax::number::ToJsString;
+use oxc_syntax::identifier::is_identifier_name;
 
 use crate::{
     IsolatedDeclarations,
@@ -69,19 +69,18 @@ impl<'a> IsolatedDeclarations<'a> {
     /// Convert a a computed property key to a static property key when possible
     fn transform_property_key(&self, key: &PropertyKey<'a>) -> PropertyKey<'a> {
         match key {
-            // [100] -> 100
-            PropertyKey::NumericLiteral(literal) => self.ast.property_key_static_identifier(
-                literal.span,
-                self.ast.atom(&literal.value.to_js_string()),
-            ),
-            // `["string"] -> string`
-            PropertyKey::StringLiteral(literal) => {
+            // ["string"] -> string
+            PropertyKey::StringLiteral(literal) if is_identifier_name(&literal.value) => {
                 self.ast.property_key_static_identifier(literal.span, literal.value.as_str())
             }
-            // `[`string`] -> string
-            PropertyKey::TemplateLiteral(literal) => {
+            // [`string`] -> string
+            PropertyKey::TemplateLiteral(literal)
+                if is_identifier_name(&literal.quasis[0].value.raw) =>
+            {
                 self.ast.property_key_static_identifier(literal.span, literal.quasis[0].value.raw)
             }
+            // [100] -> 100
+            // number literal will be cloned as-is
             _ => key.clone_in(self.ast.allocator),
         }
     }
@@ -136,7 +135,9 @@ impl<'a> IsolatedDeclarations<'a> {
                         }
                         let params = self.transform_formal_parameters(&function.params);
                         let key = self.transform_property_key(key);
-                        let computed = key.is_expression();
+                        let computed = key
+                            .as_expression()
+                            .is_some_and(|k| !k.is_string_literal() && !k.is_number_literal());
 
                         return Some(self.ast.ts_signature_method_signature(
                             object.span,
@@ -214,7 +215,8 @@ impl<'a> IsolatedDeclarations<'a> {
                     let key = self.transform_property_key(key);
                     let property_signature = self.ast.ts_signature_property_signature(
                         object.span,
-                        key.is_expression(),
+                        key.as_expression()
+                            .is_some_and(|k| !k.is_string_literal() && !k.is_number_literal()),
                         false,
                         is_const,
                         key,
diff --git a/crates/oxc_isolated_declarations/tests/fixtures/object.ts b/crates/oxc_isolated_declarations/tests/fixtures/object.ts
index 6e13542f4c834..e33a158792b1f 100644
--- a/crates/oxc_isolated_declarations/tests/fixtures/object.ts
+++ b/crates/oxc_isolated_declarations/tests/fixtures/object.ts
@@ -53,3 +53,48 @@ const ObjectKeys = {
 	[-3]: 4,
 	[4n]: 5,
 };
+
+type family =
+  '-apple-system, BlinkMacSystemFont, San Francisco, Segoe UI, Roboto, Helvetica Neue, sans-serif'
+const family: family =
+  '-apple-system, BlinkMacSystemFont, San Francisco, Segoe UI, Roboto, Helvetica Neue, sans-serif'
+const theme = {
+  'font-family': family as family
+} as const
+
+const X = {
+  'async': 1,
+  'await': 2,
+}
+
+const Y = {
+  0: 0,
+  [1]: 1,
+  ["2"]: 2,
+  set 3(v: number) {},
+  set [4](v: number) {},
+  set ["5"](v: number) {},
+};
+
+
+const exoticKeys = {
+  // --- WORKING KEYS ---
+  "a": "latin",                          // latin
+  "é": "latin-1 supplement",             // latin-1 supplement
+  "ø": "extended latin",                 // extended latin
+  "Ж": "cyrillic",                       // cyrillic
+  "你": "chinese",                        // chinese
+  "あ": "japanese",                       // japanese
+  "한": "korean",                         // korean
+  "a\u0301": "zalgo/combining",          // zalgo (a + combining acute accent)
+
+  // --- NON-WORKING KEYS ---
+  "😃": "emoji",                         // emoji
+  "👍🏻": "emoji with skin tone",          // emoji + skin tone
+  "👨‍👩‍👧‍👦": "emoji sequence",                // emoji sequence (family)
+  "±": "math symbol",                    // math symbol
+  "€": "currency",                       // currency
+  "“": "curly quote",                    // curly quote
+  "\u0000": "null byte",                 // null byte (not expected to work)
+  "\\": "backslash",                     // backslash (unique error)
+};
diff --git a/crates/oxc_isolated_declarations/tests/snapshots/object.snap b/crates/oxc_isolated_declarations/tests/snapshots/object.snap
index a6dee2af2c297..0c09662c92449 100644
--- a/crates/oxc_isolated_declarations/tests/snapshots/object.snap
+++ b/crates/oxc_isolated_declarations/tests/snapshots/object.snap
@@ -30,6 +30,43 @@ declare const ObjectKeys: {
 	3: number
 	[-3]: number
 };
+type family = "-apple-system, BlinkMacSystemFont, San Francisco, Segoe UI, Roboto, Helvetica Neue, sans-serif";
+declare const family: family;
+declare const theme: {
+	readonly "font-family": family
+};
+declare const X: {
+	async: number
+	await: number
+};
+declare const Y: {
+	0: number
+	1: number
+	"2": number
+	3: number
+	4: number
+	"5": number
+};
+declare const exoticKeys: {
+	// --- WORKING KEYS ---
+	a: string
+	é: string
+	ø: string
+	Ж: string
+	你: string
+	あ: string
+	한: string
+	á: string
+	// --- NON-WORKING KEYS ---
+	"😃": string
+	"👍🏻": string
+	"👨‍👩‍👧‍👦": string
+	"±": string
+	"€": string
+	"“": string
+	"\0": string
+	"\\": string
+};
 
 
 ==================== Errors ====================
diff --git a/tasks/coverage/snapshots/transpile.snap b/tasks/coverage/snapshots/transpile.snap
index 7670a33a6a576..711a6e15f899f 100644
--- a/tasks/coverage/snapshots/transpile.snap
+++ b/tasks/coverage/snapshots/transpile.snap
@@ -106,7 +106,7 @@ export declare const D: {
 	[Symbol.iterator]: number
 	[globalThis.Symbol.toStringTag]: number
 	1: number
-	2: number
+	"2": number
 };
 export {};