fix: don't crash "fix all missing imports" in unpatched ts 5.0

Author: zardoy

typescript/src/codeFixes.ts

@@ -2,7 +2,7 @@ import _ from 'lodash'
 import addMissingProperties from './codeFixes/addMissingProperties'
 import { changeSortingOfAutoImport, getIgnoreAutoImportSetting, isAutoImportEntryShouldBeIgnored } from './adjustAutoImports'
 import { GetConfig } from './types'
-import { findChildContainingPosition, getCancellationToken, getIndentFromPos, patchMethod } from './utils'
+import { findChildContainingPosition, getCancellationToken, getIndentFromPos, isTsPatched, patchMethod } from './utils'
 import namespaceAutoImports from './namespaceAutoImports'
 
 // codeFixes that I managed to put in files
@@ -169,7 +169,8 @@ export default (proxy: ts.LanguageService, languageService: ts.LanguageService,
 
     proxy.getCombinedCodeFix = (scope, fixId, formatOptions, preferences) => {
         const { fileName } = scope
-        if (fixId === 'fixMissingImport') {
+        // todo issue warning (or language status error) when configured but not patched
+        if (fixId === 'fixMissingImport' && isTsPatched()) {
             const program = languageService.getProgram()!
             const sourceFile = program.getSourceFile(fileName)!
             const importAdder = tsFull.codefix.createImportAdder(

typescript/src/utils.ts

@@ -120,6 +120,18 @@ export const boostExistingSuggestions = (entries: ts.CompletionEntry[], predicat
 // semver: can't use compare as it incorrectly works with build postfix
 export const isTs5 = () => semver.major(ts.version) >= 5
 
+export const isTsPatched = () => {
+    try {
+        const testFunction: any = () => {}
+        const unpatch = patchMethod(ts, 'findAncestor', () => testFunction)
+        const isPatched = ts.findAncestor === testFunction
+        unpatch()
+        return isPatched
+    } catch (err) {
+        return false
+    }
+}
+
 // Workaround esbuild bundle modules
 export const nodeModules = __WEB__
     ? null