fix(typescript-estree): add support for TS3.9 extra file extensions (typescript-eslint#1833)

sheetalkamat · web-flow · commit 1f0ff41aa1bc · 2020-04-01T15:33:27.000-07:00
diff --git a/packages/typescript-estree/src/create-program/WatchCompilerHostOfConfigFile.ts b/packages/typescript-estree/src/create-program/WatchCompilerHostOfConfigFile.ts
@@ -32,6 +32,7 @@ interface WatchCompilerHostOfConfigFile<T extends ts.BuilderProgram>
   onCachedDirectoryStructureHostCreate(
     host: CachedDirectoryStructureHost,
   ): void;
+  extraFileExtensions?: readonly ts.FileExtensionInfo[];
 }
 
 export { WatchCompilerHostOfConfigFile };
diff --git a/packages/typescript-estree/src/create-program/createWatchProgram.ts b/packages/typescript-estree/src/create-program/createWatchProgram.ts
@@ -314,6 +314,14 @@ function createWatchProgram(
       );
     oldOnDirectoryStructureHostCreate(host);
   };
+  // This works only on 3.9
+  watchCompilerHost.extraFileExtensions = extra.extraFileExtensions.map(
+    extension => ({
+      extension,
+      isMixedContent: true,
+      scriptKind: ts.ScriptKind.Deferred,
+    }),
+  );
   watchCompilerHost.trace = log;
 
   // Since we don't want to asynchronously update program we want to disable timeout methods

Original file line number	Diff line number	Diff line change
`@@ -32,6 +32,7 @@ interface WatchCompilerHostOfConfigFile<T extends ts.BuilderProgram>`
`32`	`32`	`onCachedDirectoryStructureHostCreate(`
`33`	`33`	`host: CachedDirectoryStructureHost,`
`34`	`34`	`): void;`
	`35`	`+ extraFileExtensions?: readonly ts.FileExtensionInfo[];`
`35`	`36`	`}`
`36`	`37`
`37`	`38`	`export { WatchCompilerHostOfConfigFile };`