Return a list of files that were read from loadPartialConfig

packages/babel-core/src/config/config-chain.js

@@ -40,6 +40,7 @@ export type ConfigChain = {
   plugins: Array<UnloadedDescriptor>,
   presets: Array<UnloadedDescriptor>,
   options: Array<ValidatedOptions>,
+  files: Set<string>,
 };
 
 export type PresetInstance = {
@@ -71,6 +72,7 @@ export function* buildPresetChain(
     plugins: dedupDescriptors(chain.plugins),
     presets: dedupDescriptors(chain.presets),
     options: chain.options.map(o => normalizeOptions(o)),
+    files: new Set(),
   };
 }
 
@@ -124,10 +126,13 @@ const loadPresetOverridesEnvDescriptors = makeWeakCacheSync(
     ),
 );
 
+export type FileHandling = "transpile" | "ignored" | "unsupported";
 export type RootConfigChain = ConfigChain & {
   babelrc: ConfigFile | void,
   config: ConfigFile | void,
   ignore: IgnoreFile | void,
+  fileHandling: FileHandling,
+  files: Set<string>,
 };
 
 /**
@@ -202,6 +207,7 @@ export function* buildRootChain(
       : null;
 
   let ignoreFile, babelrcFile;
+  let isIgnored = false;
   const fileChain = emptyChain();
   // resolve all .babelrc files
   if (
@@ -215,14 +221,18 @@ export function* buildRootChain(
       context.caller,
     ));
 
+    if (ignoreFile) {
+      fileChain.files.add(ignoreFile.filepath);
+    }
+
     if (
       ignoreFile &&
       shouldIgnore(context, ignoreFile.ignore, null, ignoreFile.dirname)
     ) {
-      return null;
+      isIgnored = true;
     }
 
-    if (babelrcFile) {
+    if (babelrcFile && !isIgnored) {
       const validatedFile = validateBabelrcFile(babelrcFile);
       const babelrcLogger = new ConfigPrinter();
       const result = yield* loadFileChain(
@@ -231,10 +241,16 @@ export function* buildRootChain(
         undefined,
         babelrcLogger,
       );
-      if (!result) return null;
-      babelRcReport = babelrcLogger.output();
+      if (!result) {
+        isIgnored = true;
+      } else {
+        babelRcReport = babelrcLogger.output();
+        mergeChain(fileChain, result);
+      }
+    }
 
-      mergeChain(fileChain, result);
+    if (babelrcFile && isIgnored) {
+      fileChain.files.add(babelrcFile.filepath);
     }
   }
 
@@ -257,12 +273,14 @@ export function* buildRootChain(
   );
 
   return {
-    plugins: dedupDescriptors(chain.plugins),
-    presets: dedupDescriptors(chain.presets),
-    options: chain.options.map(o => normalizeOptions(o)),
+    plugins: isIgnored ? [] : dedupDescriptors(chain.plugins),
+    presets: isIgnored ? [] : dedupDescriptors(chain.presets),
+    options: isIgnored ? [] : chain.options.map(o => normalizeOptions(o)),
+    fileHandling: isIgnored ? "ignored" : "transpile",
     ignore: ignoreFile || undefined,
     babelrc: babelrcFile || undefined,
     config: configFile || undefined,
+    files: chain.files,
   };
 }
 
@@ -355,7 +373,7 @@ const loadProgrammaticChain = makeChainWalker({
 /**
  * Build a config chain for a given file.
  */
-const loadFileChain = makeChainWalker({
+const loadFileChainWalker = makeChainWalker({
   root: file => loadFileDescriptors(file),
   env: (file, envName) => loadFileEnvDescriptors(file)(envName),
   overrides: (file, index) => loadFileOverridesDescriptors(file)(index),
@@ -364,6 +382,16 @@ const loadFileChain = makeChainWalker({
   createLogger: (file, context, baseLogger) =>
     buildFileLogger(file.filepath, context, baseLogger),
 });
+
+function* loadFileChain(input, context, files, baseLogger) {
+  const chain = yield* loadFileChainWalker(input, context, files, baseLogger);
+  if (chain) {
+    chain.files.add(input.filepath);
+  }
+
+  return chain;
+}
+
 const loadFileDescriptors = makeWeakCacheSync((file: ValidatedFile) =>
   buildRootDescriptors(file, file.filepath, createUncachedDescriptors),
 );
@@ -622,6 +650,9 @@ function mergeChain(target: ConfigChain, source: ConfigChain): ConfigChain {
   target.options.push(...source.options);
   target.plugins.push(...source.plugins);
   target.presets.push(...source.presets);
+  for (const file of source.files) {
+    target.files.add(file);
+  }
 
   return target;
 }
@@ -642,6 +673,7 @@ function emptyChain(): ConfigChain {
     options: [],
     presets: [],
     plugins: [],
+    files: new Set(),
   };
 }
 

packages/babel-core/src/config/full.js

@@ -63,7 +63,11 @@ export default gensync<[any], ResolvedConfig | null>(function* loadFullConfig(
   if (!result) {
     return null;
   }
-  const { options, context } = result;
+  const { options, context, fileHandling } = result;
+
+  if (fileHandling === "ignored") {
+    return null;
+  }
 
   const optionDefaults = {};
   const passes: Array<Array<Plugin>> = [[]];

packages/babel-core/src/config/partial.js

@@ -5,7 +5,11 @@ import gensync, { type Handler } from "gensync";
 import Plugin from "./plugin";
 import { mergeOptions } from "./util";
 import { createItemFromDescriptor } from "./item";
-import { buildRootChain, type ConfigContext } from "./config-chain";
+import {
+  buildRootChain,
+  type ConfigContext,
+  type FileHandling,
+} from "./config-chain";
 import { getEnv } from "./helpers/environment";
 import {
   validate,
@@ -59,9 +63,11 @@ function* resolveRootMode(
 type PrivPartialConfig = {
   options: ValidatedOptions,
   context: ConfigContext,
+  fileHandling: FileHandling,
   ignore: IgnoreFile | void,
   babelrc: ConfigFile | void,
   config: ConfigFile | void,
+  files: Set<string>,
 };
 
 export default function* loadPrivatePartialConfig(
@@ -137,20 +143,30 @@ export default function* loadPrivatePartialConfig(
   return {
     options,
     context,
+    fileHandling: configChain.fileHandling,
     ignore: configChain.ignore,
     babelrc: configChain.babelrc,
     config: configChain.config,
+    files: configChain.files,
   };
 }
 
+type LoadPartialConfigOpts = {
+  showIgnoredFiles?: boolean,
+  ...
+};
+
 export const loadPartialConfig = gensync<[any], PartialConfig | null>(
-  function* (inputOpts: mixed): Handler<PartialConfig | null> {
-    const result: ?PrivPartialConfig = yield* loadPrivatePartialConfig(
-      inputOpts,
-    );
+  function* (inputOpts: LoadPartialConfigOpts): Handler<PartialConfig | null> {
+    const { showIgnoredFiles, ...opts } = inputOpts;
+    const result: ?PrivPartialConfig = yield* loadPrivatePartialConfig(opts);
     if (!result) return null;
 
-    const { options, babelrc, ignore, config } = result;
+    const { options, babelrc, ignore, config, fileHandling, files } = result;
+
+    if (fileHandling === "ignored" && !showIgnoredFiles) {
+      return null;
+    }
 
     (options.plugins || []).forEach(item => {
       if (item.value instanceof Plugin) {
@@ -166,6 +182,8 @@ export const loadPartialConfig = gensync<[any], PartialConfig | null>(
       babelrc ? babelrc.filepath : undefined,
       ignore ? ignore.filepath : undefined,
       config ? config.filepath : undefined,
+      fileHandling,
+      files,
     );
   },
 );
@@ -181,17 +199,23 @@ class PartialConfig {
   babelrc: string | void;
   babelignore: string | void;
   config: string | void;
+  fileHandling: FileHandling;
+  files: Set<string>;
 
   constructor(
     options: ValidatedOptions,
     babelrc: string | void,
     ignore: string | void,
     config: string | void,
+    fileHandling: FileHandling,
+    files: Set<string>,
   ) {
     this.options = options;
     this.babelignore = ignore;
     this.babelrc = babelrc;
     this.config = config;
+    this.fileHandling = fileHandling;
+    this.files = files;
 
     // Freeze since this is a public API and it should be extremely obvious that
     // reassigning properties on here does nothing.

packages/babel-core/test/config-chain.js

@@ -1222,6 +1222,65 @@ describe("buildConfigChain", function () {
           loadOptionsAsync({ filename, cwd: path.dirname(filename) }),
         ).rejects.toThrow(error);
       });
+
+      it("loadPartialConfig should return a list of files that were extended", () => {
+        const filename = fixture("config-files", "babelrc-extended", "src.js");
+
+        expect(
+          babel.loadPartialConfig({ filename, cwd: path.dirname(filename) }),
+        ).toEqual({
+          babelignore: fixture("config-files", ".babelignore"),
+          babelrc: fixture("config-files", "babelrc-extended", ".babelrc"),
+          config: undefined,
+          fileHandling: "transpile",
+          options: {
+            ...getDefaults(),
+            filename: filename,
+            cwd: path.dirname(filename),
+            root: path.dirname(filename),
+            comments: true,
+          },
+          files: new Set([
+            fixture("config-files", ".babelignore"),
+            fixture("config-files", "babelrc-extended", ".babelrc-extended"),
+            fixture("config-files", "babelrc-extended", ".babelrc"),
+          ]),
+        });
+      });
+
+      it("loadPartialConfig should return null when ignored", () => {
+        const filename = fixture("config-files", "babelignore", "src.js");
+
+        expect(
+          babel.loadPartialConfig({ filename, cwd: path.dirname(filename) }),
+        ).toBeNull();
+      });
+
+      it("loadPartialConfig should return a list of files when ignored with showIgnoredFiles option", () => {
+        const filename = fixture("config-files", "babelignore", "src.js");
+
+        expect(
+          babel.loadPartialConfig({
+            filename,
+            cwd: path.dirname(filename),
+            showIgnoredFiles: true,
+          }),
+        ).toEqual({
+          babelignore: fixture("config-files", "babelignore", ".babelignore"),
+          babelrc: undefined,
+          config: undefined,
+          fileHandling: "ignored",
+          options: {
+            ...getDefaults(),
+            filename: filename,
+            cwd: path.dirname(filename),
+            root: path.dirname(filename),
+          },
+          files: new Set([
+            fixture("config-files", "babelignore", ".babelignore"),
+          ]),
+        });
+      });
     });
 
     it("should throw when `test` presents but `filename` is not passed", () => {

packages/babel-core/test/fixtures/config/config-files/babelrc-extended/.babelrc

@@ -0,0 +1,3 @@
+{
+  "extends": "./.babelrc-extended"
+}

packages/babel-core/test/fixtures/config/config-files/babelrc-extended/.babelrc-extended

@@ -0,0 +1,3 @@
+{
+  "comments": true
+}