@babel/core: add loadPartialConfigAsync (#51741)

* @babel/core: add `loadPartialConfigAsync` * test
DefinitelyTyped · Mar 15, 2021 · a072046 · a072046
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diff --git a/types/babel__core/babel__core-tests.ts b/types/babel__core/babel__core-tests.ts
@@ -127,6 +127,9 @@ checkConfigFunction(api => {
 // $ExpectType Readonly<PartialConfig> | null
 const partialConfig = babel.loadPartialConfig();
 
+// $ExpectType Promise<Readonly<PartialConfig> | null>
+const partialConfigPromise = babel.loadPartialConfigAsync();
+
 if (partialConfig) {
     // $ExpectType boolean
     partialConfig.hasFilesystemConfig();

diff --git a/types/babel__core/index.d.ts b/types/babel__core/index.d.ts
@@ -551,6 +551,7 @@ export function loadOptions(options?: TransformOptions): object | null;
  * information about `ConfigItem` fields.
  */
 export function loadPartialConfig(options?: TransformOptions): Readonly<PartialConfig> | null;
+export function loadPartialConfigAsync(options?: TransformOptions): Promise<Readonly<PartialConfig> | null>;
 
 export interface PartialConfig {
     options: TransformOptions;