fix: allow underscores in string enum values

Author: MarshallOfSound

Diff for: src/__tests__/markdown-helpers.spec.ts

@@ -103,7 +103,7 @@ def fn():
       expect(extractStringEnum('wassup')).toBe(null);
     });
 
-    describe('with single quotes', () => {
+    describe('with backticks', () => {
       it('should extract an enum of the format "can be x"', () => {
         const values = extractStringEnum('Can be `x`')!;
         expect(values).not.toBe(null);
@@ -160,9 +160,18 @@ def fn():
         expect(values[1].value).toBe('b');
         expect(values[2].value).toBe('c');
       });
+
+      it.only('should extract an enum with underscores in the values', () => {
+        const values = extractStringEnum('Values includes `a`, `b_c` and `d`')!;
+        expect(values).not.toBe(null);
+        expect(values).toHaveLength(3);
+        expect(values[0].value).toBe('a');
+        expect(values[1].value).toBe('b_c');
+        expect(values[2].value).toBe('d');
+      });
     });
 
-    describe('with backticks', () => {
+    describe('with single quotes', () => {
       it('should extract an enum of the format "can be x"', () => {
         const values = extractStringEnum(`Can be 'x'`)!;
         expect(values).not.toBe(null);

Diff for: src/markdown-helpers.ts

@@ -403,11 +403,11 @@ export enum StripReturnTypeBehavior {
 export const extractStringEnum = (description: string): PossibleStringValue[] | null => {
   const possibleValues: PossibleStringValue[] = [];
 
-  const inlineValuesPattern = /(?:can be|values include) ((?:(?:[`|'][a-zA-Z-]+[`|'])(?:(, | )?))*(?:(?:or|and) [`|'][a-zA-Z-]+[`|'])?)/i;
+  const inlineValuesPattern = /(?:can be|values? includes?) ((?:(?:[`|'][a-zA-Z-_]+[`|'])(?:(, | )?))*(?:(?:or|and) [`|'][a-zA-Z-_]+[`|'])?)/i;
   const inlineMatch = inlineValuesPattern.exec(description);
   if (inlineMatch) {
     const valueString = inlineMatch[1];
-    const valuePattern = /[`|']([a-zA-Z-]+)[`|']/g;
+    const valuePattern = /[`|']([a-zA-Z-_]+)[`|']/g;
     let value = valuePattern.exec(valueString);
 
     while (value) {