fix(devcheck): advance scanner past consumed --conditions value; drop invalid -C= form

devcheck.mjs

@@ -61,12 +61,19 @@ if (existsSync(srcPath) && !isCI && !isInstalledPackage) {
 	const scan = (tokens) => {
 		for (let i = 0; i < tokens.length; i++) {
 			if (tokens[i] === "--conditions" || tokens[i] === "-C") {
-				if (tokens[i + 1] !== undefined) conditions.push(tokens[i + 1]);
+				// Space form (`--conditions x` / `-C x`): consume the following token as this
+				// flag's value and SKIP it, so a value that itself looks like a flag (e.g. the
+				// literal `--conditions=x`) isn't re-interpreted on the next iteration.
+				if (tokens[i + 1] !== undefined) {
+					conditions.push(tokens[i + 1]);
+					i++;
+				}
 			} else if (tokens[i].startsWith("--conditions=")) {
 				conditions.push(tokens[i].slice("--conditions=".length));
-			} else if (tokens[i].startsWith("-C=")) {
-				conditions.push(tokens[i].slice("-C=".length));
 			}
+			// Note: `-C=x` is intentionally not handled - Node rejects it ("bad option"),
+			// so it can never appear in execArgv/NODE_OPTIONS. Valid forms are
+			// `--conditions=x`, `--conditions x`, and `-C x`.
 		}
 	};
 	scan(process.execArgv);

tests/DevCheck.test.vitest.mjs

@@ -92,6 +92,14 @@ describe("devcheck", () => {
 		expect(status).toBe(0);
 	});
 
+	test("stays silent via the -C short flag (Node's alias for --conditions)", () => {
+		// Node accepts `-C <value>` (space form) but rejects `-C=<value>`, so only the
+		// space form is a real input to detect.
+		const { status, stderr } = runDevcheck({ src: true }, { nodeArgs: ["-C", "uuid-dev"] });
+		expect(status).toBe(0);
+		expect(stderr).toBe("");
+	});
+
 	test("NODE_ENV=development alone does NOT silence it (only the condition selects src/)", () => {
 		// Keying off NODE_ENV would be a false negative: dev env set but no condition means
 		// the package is still resolving to dist/, which is exactly what should be flagged.