fix: Enum option cannot generate enums if values are not valid property names (#1761)

* chore(test): add InvalidPropertyNameChars with enum flag

* fix: Quote the name if it consists entirely of invalid characters and replace only the invalid characters with "_" if they are part of the name

* chore: fix lint error

* chore: add changeset patch md

Author: yoshi2no

.changeset/brave-lizards-juggle.md

@@ -0,0 +1,5 @@
+---
+"openapi-typescript": patch
+---
+
+fix: Enum option cannot generate enums if values are not valid property names

packages/openapi-typescript/src/lib/ts.ts

@@ -285,7 +285,15 @@ export function tsEnumMember(value: string | number, metadata: { name?: string;
     } else if (name[0] === "-") {
       name = `ValueMinus${name.slice(1)}`;
     }
-    name = name.replace(JS_PROPERTY_INDEX_INVALID_CHARS_RE, "_");
+
+    const invalidCharMatch = name.match(JS_PROPERTY_INDEX_INVALID_CHARS_RE);
+    if (invalidCharMatch) {
+      if (invalidCharMatch[0] === name) {
+        name = `"${name}"`;
+      } else {
+        name = name.replace(JS_PROPERTY_INDEX_INVALID_CHARS_RE, "_");
+      }
+    }
   }
 
   let member: ts.EnumMember;

packages/openapi-typescript/test/node-api.test.ts

@@ -617,6 +617,10 @@ export type operations = Record<string, never>;`,
                 "x-enumNames": ["Uno", "Dos", "Tres"],
                 "x-enumDescriptions": ["El número uno", "El número dos", "El número tres"],
               },
+              InvalidPropertyNameChars: {
+                type: "string",
+                enum: ["=", "!=", ">", "~", "^", "TE=ST"],
+              },
             },
           },
         },
@@ -660,6 +664,8 @@ export interface components {
         XEnumVarnames: XEnumVarnames;
         /** @enum {number} */
         XEnumNames: XEnumNames;
+        /** @enum {string} */
+        InvalidPropertyNameChars: InvalidPropertyNameChars;
     };
     responses: never;
     parameters: never;
@@ -700,6 +706,14 @@ export enum XEnumNames {
     // El número tres
     Tres = 3
 }
+export enum InvalidPropertyNameChars {
+    "=" = "=",
+    "!=" = "!=",
+    ">" = ">",
+    "~" = "~",
+    "^" = "^",
+    TE_ST = "TE=ST"
+}
 export type operations = Record<string, never>;`,
         options: { enum: true },
       },