Provide better error message when allowDeclareFields is enabled (#15847)

JLHwung · nicolo-ribaudo · web-flow · commit e8ef84279205 · 2023-08-09T02:34:41.000+02:00
Co-authored-by: Nicolò Ribaudo &lt;hello@nicr.dev&gt;
diff --git a/packages/babel-preset-typescript/src/normalize-options.ts b/packages/babel-preset-typescript/src/normalize-options.ts
@@ -34,6 +34,10 @@ export default function normalizeOptions(options: Options = {}) {
   };
 
   if (process.env.BABEL_8_BREAKING) {
+    v.invariant(
+      !("allowDeclareFields" in options),
+      "The .allowDeclareFields option has been removed and it's now always enabled. Please remove it from your config.",
+    );
     v.invariant(
       !("allExtensions" in options) && !("isTSX" in options),
       "The .allExtensions and .isTSX options have been removed.\n" +
diff --git a/packages/babel-preset-typescript/test/fixtures/opts/allowDeclareFields/input.ts b/packages/babel-preset-typescript/test/fixtures/opts/allowDeclareFields/input.ts
diff --git a/packages/babel-preset-typescript/test/fixtures/opts/allowDeclareFields/options.json b/packages/babel-preset-typescript/test/fixtures/opts/allowDeclareFields/options.json
@@ -0,0 +1,5 @@
+{
+  "BABEL_8_BREAKING": true,
+  "presets": [["typescript", { "allowDeclareFields": true }]],
+  "throws": "The .allowDeclareFields option has been removed and it's now always enabled. Please remove it from your config."
+}
