flags: treat underscores as hyphens

Author: nicktrn

packages/core/src/v3/build/flags.test.ts

@@ -18,6 +18,11 @@ describe("dedupFlags", () => {
     expect(dedupFlags("--log=info --log=warn --log=error")).toBe("--log=error");
   });
 
+  it("should treat underscores as hyphens", () => {
+    expect(dedupFlags("--debug_level=info")).toBe("--debug-level=info");
+    expect(dedupFlags("--debug_level=info --debug-level=warn")).toBe("--debug-level=warn");
+  });
+
   it("should handle mix of flags with and without values", () => {
     expect(dedupFlags("--debug=false -v --debug=true")).toBe("-v --debug=true");
     expect(dedupFlags("-v --quiet -v")).toBe("--quiet -v");

packages/core/src/v3/build/flags.ts

@@ -27,11 +27,11 @@ export function dedupFlags(flags: string): string {
     .map((flag): [string, string | boolean] => {
       const equalIndex = flag.indexOf("=");
       if (equalIndex !== -1) {
-        const key = flag.slice(0, equalIndex);
+        const key = flag.slice(0, equalIndex).replace(/_/g, "-");
         const value = flag.slice(equalIndex + 1);
         return [key, value];
       } else {
-        return [flag, true];
+        return [flag.replace(/_/g, "-"), true];
       }
     });