Only search for .babelrc files in the 'root' package by default.

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

@@ -8,6 +8,7 @@ import {
   type ValidatedOptions,
   type IgnoreList,
   type ConfigApplicableTest,
+  type BabelrcSearch,
 } from "./validation/options";
 
 const debug = buildDebug("babel:config:config-chain");
@@ -19,6 +20,7 @@ import {
   loadConfig,
   type ConfigFile,
   type IgnoreFile,
+  type FilePackageData,
 } from "./files";
 
 import { makeWeakCache, makeStrongCache } from "./caching";
@@ -128,12 +130,16 @@ export function buildRootChain(
   );
   if (!programmaticChain) return null;
 
-  const { root: rootDir = ".", configFile: configFileName } = opts;
+  const {
+    root: rootDir = ".",
+    babelrc = undefined,
+    configFile: configFileName = true,
+  } = opts;
 
   let configFile;
   if (typeof configFileName === "string") {
     configFile = loadConfig(configFileName, context.cwd, context.envName);
-  } else if (configFileName === undefined || configFileName === true) {
+  } else if (configFileName === true) {
     configFile = findRootConfig(
       path.resolve(context.cwd, rootDir),
       context.envName,
@@ -153,21 +159,24 @@ export function buildRootChain(
       ? findPackageData(context.filename)
       : null;
 
-  let ignore, babelrc;
+  let ignoreFile, babelrcFile;
   const fileChain = emptyChain();
   // resolve all .babelrc files
-  if (opts.babelrc !== false && pkgData) {
-    ({ ignore, config: babelrc } = findRelativeConfig(
+  if (pkgData && babelrcLoadEnabled(context, pkgData, babelrc, rootDir)) {
+    ({ ignore: ignoreFile, config: babelrcFile } = findRelativeConfig(
       pkgData,
       context.envName,
     ));
 
-    if (ignore && shouldIgnore(context, ignore.ignore, null, ignore.dirname)) {
+    if (
+      ignoreFile &&
+      shouldIgnore(context, ignoreFile.ignore, null, ignoreFile.dirname)
+    ) {
       return null;
     }
 
-    if (babelrc) {
-      const result = loadFileChain(babelrc, context);
+    if (babelrcFile) {
+      const result = loadFileChain(babelrcFile, context);
       if (!result) return null;
 
       mergeChain(fileChain, result);
@@ -185,12 +194,39 @@ export function buildRootChain(
     plugins: dedupDescriptors(chain.plugins),
     presets: dedupDescriptors(chain.presets),
     options: chain.options.map(o => normalizeOptions(o)),
-    ignore: ignore || undefined,
-    babelrc: babelrc || undefined,
+    ignore: ignoreFile || undefined,
+    babelrc: babelrcFile || undefined,
     config: configFile || undefined,
   };
 }
 
+function babelrcLoadEnabled(
+  context: ConfigContext,
+  pkgData: FilePackageData,
+  babelrc: BabelrcSearch | void,
+  rootDir: string,
+): boolean {
+  if (typeof babelrc === "boolean") return babelrc;
+
+  const absoluteRoot = path.resolve(context.cwd, rootDir);
+
+  // Fast path to avoid having to load micromatch if the babelrc is just
+  // loading in the standard root directory.
+  if (
+    babelrc === undefined ||
+    babelrc === rootDir ||
+    (Array.isArray(babelrc) && babelrc.length === 1 && babelrc[0] === rootDir)
+  ) {
+    return pkgData.directories.indexOf(absoluteRoot) !== -1;
+  }
+
+  const babelrcRoots = (Array.isArray(babelrc) ? babelrc : [babelrc]).map(pat =>
+    path.resolve(context.cwd, pat),
+  );
+
+  return micromatch(pkgData.directories, babelrcRoots).length > 0;
+}
+
 /**
  * Build a config chain for just the programmatic options passed into Babel.
  */

packages/babel-core/src/config/validation/option-assertions.js

@@ -2,6 +2,7 @@
 
 import type {
   ConfigFileSearch,
+  BabelrcSearch,
   IgnoreList,
   IgnoreItem,
   PluginList,
@@ -183,6 +184,27 @@ export function assertConfigFileSearch(
   return value;
 }
 
+export function assertBabelrcSearch(
+  key: string,
+  value: mixed,
+): BabelrcSearch | void {
+  if (value === undefined || typeof value === "boolean") return value;
+
+  if (Array.isArray(value)) {
+    value.forEach((item, i) => {
+      if (typeof item !== "string") {
+        throw new Error(`.${key}[${i}] must be a string.`);
+      }
+    });
+  } else if (typeof value !== "string") {
+    throw new Error(
+      `.${key} must be a undefined, a boolean, a string, ` +
+        `or an array of strings, got ${JSON.stringify(value)}`,
+    );
+  }
+  return (value: any);
+}
+
 export function assertPluginList(key: string, value: mixed): PluginList | void {
   const arr = assertArray(key, value);
   if (arr) {

packages/babel-core/src/config/validation/options.js

@@ -14,6 +14,7 @@ import {
   assertPluginList,
   assertConfigApplicableTest,
   assertConfigFileSearch,
+  assertBabelrcSearch,
   assertFunction,
   assertSourceMaps,
   assertCompact,
@@ -35,7 +36,7 @@ const ROOT_VALIDATORS: ValidatorSet = {
   filenameRelative: (assertString: Validator<
     $PropertyType<ValidatedOptions, "filenameRelative">,
   >),
-  babelrc: (assertBoolean: Validator<
+  babelrc: (assertBabelrcSearch: Validator<
     $PropertyType<ValidatedOptions, "babelrc">,
   >),
   code: (assertBoolean: Validator<$PropertyType<ValidatedOptions, "code">>),
@@ -156,7 +157,7 @@ export type ValidatedOptions = {
   cwd?: string,
   filename?: string,
   filenameRelative?: string,
-  babelrc?: boolean,
+  babelrc?: BabelrcSearch,
   code?: boolean,
   configFile?: ConfigFileSearch,
   root?: string,
@@ -232,6 +233,7 @@ export type OverridesList = Array<ValidatedOptions>;
 export type ConfigApplicableTest = IgnoreItem | Array<IgnoreItem>;
 
 export type ConfigFileSearch = string | boolean;
+export type BabelrcSearch = boolean | string | Array<string>;
 export type SourceMapsOption = boolean | "inline" | "both";
 export type SourceTypeOption = "module" | "script" | "unambiguous";
 export type CompactOption = boolean | "auto";

packages/babel-core/test/api.js

@@ -294,6 +294,7 @@ describe("api", function() {
     process.env.BABEL_ENV = "development";
 
     const result = babel.transform("", {
+      cwd: path.join(__dirname, "fixtures", "config", "complex-plugin-config"),
       filename: path.join(
         __dirname,
         "fixtures",

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

@@ -11,6 +11,7 @@ describe("buildConfigChain", function() {
     describe("single", () => {
       it("should process matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: fixture("nonexistant-fake"),
@@ -22,6 +23,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: new RegExp(fixture("nonexistant-fake")),
@@ -33,6 +35,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: p => p.indexOf(fixture("nonexistant-fake")) === 0,
@@ -44,6 +47,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: fixture("nonexistant-fake-unknown"),
@@ -55,6 +59,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: new RegExp(fixture("nonexistant-unknown")),
@@ -66,6 +71,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: p => p.indexOf(fixture("nonexistant-unknown")) === 0,
@@ -79,6 +85,7 @@ describe("buildConfigChain", function() {
     describe("array", () => {
       it("should process matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: [fixture("nonexistant-fake")],
@@ -90,6 +97,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: [new RegExp(fixture("nonexistant-fake"))],
@@ -101,6 +109,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: [p => p.indexOf(fixture("nonexistant-fake")) === 0],
@@ -112,6 +121,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: [fixture("nonexistant-fake-unknown")],
@@ -123,6 +133,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: [new RegExp(fixture("nonexistant-unknown"))],
@@ -134,6 +145,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           test: [p => p.indexOf(fixture("nonexistant-unknown")) === 0],
@@ -149,6 +161,7 @@ describe("buildConfigChain", function() {
     describe("single", () => {
       it("should process matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: fixture("nonexistant-fake"),
@@ -160,6 +173,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: new RegExp(fixture("nonexistant-fake")),
@@ -171,6 +185,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: p => p.indexOf(fixture("nonexistant-fake")) === 0,
@@ -182,6 +197,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: fixture("nonexistant-fake-unknown"),
@@ -193,6 +209,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: new RegExp(fixture("nonexistant-unknown")),
@@ -204,6 +221,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: p => p.indexOf(fixture("nonexistant-unknown")) === 0,
@@ -217,6 +235,7 @@ describe("buildConfigChain", function() {
     describe("array", () => {
       it("should process matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: [fixture("nonexistant-fake")],
@@ -228,6 +247,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: [new RegExp(fixture("nonexistant-fake"))],
@@ -239,6 +259,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: [p => p.indexOf(fixture("nonexistant-fake")) === 0],
@@ -250,6 +271,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: [fixture("nonexistant-fake-unknown")],
@@ -261,6 +283,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: [new RegExp(fixture("nonexistant-unknown"))],
@@ -272,6 +295,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           include: [p => p.indexOf(fixture("nonexistant-unknown")) === 0],
@@ -287,6 +311,7 @@ describe("buildConfigChain", function() {
     describe("single", () => {
       it("should process matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: fixture("nonexistant-fake"),
@@ -298,6 +323,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: new RegExp(fixture("nonexistant-fake")),
@@ -309,6 +335,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: p => p.indexOf(fixture("nonexistant-fake")) === 0,
@@ -320,6 +347,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: fixture("nonexistant-fake-unknown"),
@@ -331,6 +359,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: new RegExp(fixture("nonexistant-unknown")),
@@ -342,6 +371,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: p => p.indexOf(fixture("nonexistant-unknown")) === 0,
@@ -355,6 +385,7 @@ describe("buildConfigChain", function() {
     describe("array", () => {
       it("should process matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: [fixture("nonexistant-fake")],
@@ -366,6 +397,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: [new RegExp(fixture("nonexistant-fake"))],
@@ -377,6 +409,7 @@ describe("buildConfigChain", function() {
 
       it("should process matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: [p => p.indexOf(fixture("nonexistant-fake")) === 0],
@@ -388,6 +421,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching string values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: [fixture("nonexistant-fake-unknown")],
@@ -399,6 +433,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching RegExp values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: [new RegExp(fixture("nonexistant-unknown"))],
@@ -410,6 +445,7 @@ describe("buildConfigChain", function() {
 
       it("should process non-matching function values", () => {
         const opts = loadOptions({
+          cwd: fixture("nonexistant-fake"),
           filename: fixture("nonexistant-fake", "src.js"),
           babelrc: false,
           exclude: [p => p.indexOf(fixture("nonexistant-unknown")) === 0],
@@ -424,6 +460,7 @@ describe("buildConfigChain", function() {
   describe("ignore", () => {
     it("should ignore files that match", () => {
       const opts = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         ignore: [
@@ -441,6 +478,7 @@ describe("buildConfigChain", function() {
 
     it("should not ignore files that don't match", () => {
       const opts = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         ignore: [
@@ -456,6 +494,7 @@ describe("buildConfigChain", function() {
   describe("only", () => {
     it("should ignore files that don't match", () => {
       const opts = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         only: [
@@ -469,6 +508,7 @@ describe("buildConfigChain", function() {
 
     it("should not ignore files that match", () => {
       const opts = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         only: [
@@ -484,6 +524,7 @@ describe("buildConfigChain", function() {
   describe("ignore/only", () => {
     it("should ignore files that match ignore and don't match only", () => {
       const opts = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         ignore: [fixture("nonexistant-fake", "src.js")],
@@ -495,6 +536,7 @@ describe("buildConfigChain", function() {
 
     it("should ignore files that match ignore and also only", () => {
       const opts = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         ignore: [fixture("nonexistant-fake", "src.js")],
@@ -506,6 +548,7 @@ describe("buildConfigChain", function() {
 
     it("should not ignore files that match only and not ignore", () => {
       const opts = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         only: [fixture("nonexistant-fake", "src.js")],
@@ -516,6 +559,7 @@ describe("buildConfigChain", function() {
 
     it("should not ignore files when no ignore/only are specified", () => {
       const opts = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
       });
@@ -525,6 +569,7 @@ describe("buildConfigChain", function() {
 
     it("should allow negation of only", () => {
       const opts1 = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         only: [
@@ -535,6 +580,7 @@ describe("buildConfigChain", function() {
       expect(opts1).toBeNull();
 
       const opts2 = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         only: [
@@ -545,6 +591,7 @@ describe("buildConfigChain", function() {
       expect(opts2).not.toBeNull();
 
       const opts3 = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "folder", "src.js"),
         babelrc: false,
         only: [
@@ -557,6 +604,7 @@ describe("buildConfigChain", function() {
 
     it("should allow negation of ignore", () => {
       const opts1 = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         ignore: [
@@ -568,6 +616,7 @@ describe("buildConfigChain", function() {
 
       // Tests disabled pending https://github.com/babel/babel/issues/6907
       // const opts2 = loadOptions({
+      //   cwd: fixture("nonexistant-fake"),
       //   filename: fixture("nonexistant-fake", "src.js"),
       //   babelrc: false,
       //   ignore: [
@@ -578,6 +627,7 @@ describe("buildConfigChain", function() {
       // expect(opts2).not.toBeNull();
       //
       // const opts3 = loadOptions({
+      //   cwd: fixture("nonexistant-fake"),
       //   filename: fixture("nonexistant-fake", "folder", "src.js"),
       //   babelrc: false,
       //   ignore: [
@@ -718,13 +768,13 @@ describe("buildConfigChain", function() {
           "package.json",
         );
 
-        const opts1 = loadOptions({ filename });
-        const opts2 = loadOptions({ filename });
+        const opts1 = loadOptions({ filename, cwd: path.dirname(filename) });
+        const opts2 = loadOptions({ filename, cwd: path.dirname(filename) });
 
         touch(pkgJSON);
 
-        const opts3 = loadOptions({ filename });
-        const opts4 = loadOptions({ filename });
+        const opts3 = loadOptions({ filename, cwd: path.dirname(filename) });
+        const opts4 = loadOptions({ filename, cwd: path.dirname(filename) });
 
         expect(opts1.plugins).toHaveLength(1);
         expect(opts2.plugins).toHaveLength(1);
@@ -752,13 +802,13 @@ describe("buildConfigChain", function() {
           ".babelrc",
         );
 
-        const opts1 = loadOptions({ filename });
-        const opts2 = loadOptions({ filename });
+        const opts1 = loadOptions({ filename, cwd: path.dirname(filename) });
+        const opts2 = loadOptions({ filename, cwd: path.dirname(filename) });
 
         touch(babelrcFile);
 
-        const opts3 = loadOptions({ filename });
-        const opts4 = loadOptions({ filename });
+        const opts3 = loadOptions({ filename, cwd: path.dirname(filename) });
+        const opts4 = loadOptions({ filename, cwd: path.dirname(filename) });
 
         expect(opts1.plugins).toHaveLength(1);
         expect(opts2.plugins).toHaveLength(1);
@@ -780,11 +830,19 @@ describe("buildConfigChain", function() {
           "src.js",
         );
 
-        const opts1 = loadOptions({ filename });
-        const opts2 = loadOptions({ filename });
+        const opts1 = loadOptions({ filename, cwd: path.dirname(filename) });
+        const opts2 = loadOptions({ filename, cwd: path.dirname(filename) });
 
-        const opts3 = loadOptions({ filename, envName: "new-env" });
-        const opts4 = loadOptions({ filename, envName: "new-env" });
+        const opts3 = loadOptions({
+          filename,
+          envName: "new-env",
+          cwd: path.dirname(filename),
+        });
+        const opts4 = loadOptions({
+          filename,
+          envName: "new-env",
+          cwd: path.dirname(filename),
+        });
 
         expect(opts1.plugins).toHaveLength(1);
         expect(opts2.plugins).toHaveLength(1);
@@ -803,6 +861,7 @@ describe("buildConfigChain", function() {
   describe("overrides merging", () => {
     it("should apply matching overrides over base configs", () => {
       const opts = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         comments: true,
@@ -819,6 +878,7 @@ describe("buildConfigChain", function() {
 
     it("should not apply non-matching overrides over base configs", () => {
       const opts = loadOptions({
+        cwd: fixture("nonexistant-fake"),
         filename: fixture("nonexistant-fake", "src.js"),
         babelrc: false,
         comments: true,
@@ -860,9 +920,15 @@ describe("buildConfigChain", function() {
     it("should load .babelrc", () => {
       const filename = fixture("config-files", "babelrc", "src.js");
 
-      expect(loadOptions({ filename })).toEqual({
+      expect(
+        loadOptions({
+          filename,
+          cwd: path.dirname(filename),
+        }),
+      ).toEqual({
         ...getDefaults(),
         filename,
+        cwd: path.dirname(filename),
         comments: true,
       });
     });
@@ -870,9 +936,10 @@ describe("buildConfigChain", function() {
     it("should load .babelrc.js", () => {
       const filename = fixture("config-files", "babelrc-js", "src.js");
 
-      expect(loadOptions({ filename })).toEqual({
+      expect(loadOptions({ filename, cwd: path.dirname(filename) })).toEqual({
         ...getDefaults(),
         filename,
+        cwd: path.dirname(filename),
         comments: true,
       });
     });
@@ -880,9 +947,10 @@ describe("buildConfigChain", function() {
     it("should load package.json#babel", () => {
       const filename = fixture("config-files", "pkg", "src.js");
 
-      expect(loadOptions({ filename })).toEqual({
+      expect(loadOptions({ filename, cwd: path.dirname(filename) })).toEqual({
         ...getDefaults(),
         filename,
+        cwd: path.dirname(filename),
         comments: true,
       });
     });
@@ -890,39 +958,40 @@ describe("buildConfigChain", function() {
     it("should load .babelignore", () => {
       const filename = fixture("config-files", "babelignore", "src.js");
 
-      expect(loadOptions({ filename })).toBeNull();
+      expect(loadOptions({ filename, cwd: path.dirname(filename) })).toBeNull();
     });
 
     it("should throw if there are both .babelrc and .babelrc.js", () => {
       const filename = fixture("config-files", "both-babelrc", "src.js");
 
-      expect(() => loadOptions({ filename })).toThrow(
-        /Multiple configuration files found/,
-      );
+      expect(() =>
+        loadOptions({ filename, cwd: path.dirname(filename) }),
+      ).toThrow(/Multiple configuration files found/);
     });
 
     it("should throw if there are both .babelrc and package.json", () => {
       const filename = fixture("config-files", "pkg-babelrc", "src.js");
 
-      expect(() => loadOptions({ filename })).toThrow(
-        /Multiple configuration files found/,
-      );
+      expect(() =>
+        loadOptions({ filename, cwd: path.dirname(filename) }),
+      ).toThrow(/Multiple configuration files found/);
     });
 
     it("should throw if there are both .babelrc.js and package.json", () => {
       const filename = fixture("config-files", "pkg-babelrc-js", "src.js");
 
-      expect(() => loadOptions({ filename })).toThrow(
-        /Multiple configuration files found/,
-      );
+      expect(() =>
+        loadOptions({ filename, cwd: path.dirname(filename) }),
+      ).toThrow(/Multiple configuration files found/);
     });
 
     it("should ignore package.json without a 'babel' property", () => {
       const filename = fixture("config-files", "pkg-ignored", "src.js");
 
-      expect(loadOptions({ filename })).toEqual({
+      expect(loadOptions({ filename, cwd: path.dirname(filename) })).toEqual({
         ...getDefaults(),
         filename,
+        cwd: path.dirname(filename),
         comments: true,
       });
     });
@@ -930,23 +999,25 @@ describe("buildConfigChain", function() {
     it("should show helpful errors for .babelrc", () => {
       const filename = fixture("config-files", "babelrc-error", "src.js");
 
-      expect(() => loadOptions({ filename })).toThrow(
-        /Error while parsing config - /,
-      );
+      expect(() =>
+        loadOptions({ filename, cwd: path.dirname(filename) }),
+      ).toThrow(/Error while parsing config - /);
     });
 
     it("should show helpful errors for .babelrc.js", () => {
       const filename = fixture("config-files", "babelrc-js-error", "src.js");
 
-      expect(() => loadOptions({ filename })).toThrow(/Babelrc threw an error/);
+      expect(() =>
+        loadOptions({ filename, cwd: path.dirname(filename) }),
+      ).toThrow(/Babelrc threw an error/);
     });
 
     it("should show helpful errors for package.json", () => {
       const filename = fixture("config-files", "pkg-error", "src.js");
 
-      expect(() => loadOptions({ filename })).toThrow(
-        /Error while parsing JSON - /,
-      );
+      expect(() =>
+        loadOptions({ filename, cwd: path.dirname(filename) }),
+      ).toThrow(/Error while parsing JSON - /);
     });
   });
 });

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

@@ -25,6 +25,7 @@ describe("@babel/core config loading", () => {
 
   function makeOpts(skipProgrammatic = false) {
     return {
+      cwd: path.dirname(FILEPATH),
       filename: FILEPATH,
       presets: skipProgrammatic
         ? null

packages/babel-preset-env/test/debug-fixtures.js

@@ -52,7 +52,9 @@ const buildTest = opts => {
     let args = [binLoc];
     args = args.concat(opts.args);
 
-    const spawn = child.spawn(process.execPath, args);
+    const spawn = child.spawn(process.execPath, args, {
+      cwd: tmpLoc,
+    });
 
     let stdout = "";
     let stderr = "";