From 2ee02883ab5651f1024492fa1247b5429e50e3b4 Mon Sep 17 00:00:00 2001
From: Brad Zacher <brad.zacher@gmail.com>
Date: Fri, 6 Sep 2019 12:14:20 -0700
Subject: [PATCH 1/4] test: temp commit - testing duplicate files

---
 .../src/WatchCompilerHostOfConfigFile.ts      | 29 +++++++++++++++
 packages/typescript-estree/src/parser.ts      |  1 +
 .../typescript-estree/src/semantic-errors.ts  |  1 +
 .../typescript-estree/src/tsconfig-parser.ts  | 35 ++++++++-----------
 .../tests/fixtures/duplicateFileNames/test.js |  1 +
 .../tests/fixtures/duplicateFileNames/test.ts |  1 +
 .../fixtures/duplicateFileNames/tsconfig.json |  6 ++++
 packages/typescript-estree/tests/lib/parse.ts | 26 ++++++++++++++
 8 files changed, 79 insertions(+), 21 deletions(-)
 create mode 100644 packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts
 create mode 100644 packages/typescript-estree/tests/fixtures/duplicateFileNames/test.js
 create mode 100644 packages/typescript-estree/tests/fixtures/duplicateFileNames/test.ts
 create mode 100644 packages/typescript-estree/tests/fixtures/duplicateFileNames/tsconfig.json

diff --git a/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts b/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts
new file mode 100644
index 000000000000..d5185cb2eef3
--- /dev/null
+++ b/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts
@@ -0,0 +1,29 @@
+// These types are internal to typescript
+
+import * as ts from 'typescript'; // leave this as * as ts so people using util package don't need syntheticDefaultImports
+
+interface DirectoryStructureHost {
+  fileExists(path: string): boolean;
+  readFile(path: string, encoding?: string): string | undefined;
+
+  // TODO: GH#18217 Optional methods are frequently used as non-optional
+  directoryExists?(path: string): boolean;
+  getDirectories?(path: string): string[];
+  readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+  realpath?(path: string): string;
+
+  createDirectory?(path: string): void;
+  writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+}
+
+interface CachedDirectoryStructureHost extends DirectoryStructureHost {
+  readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+}
+
+interface WatchCompilerHostOfConfigFile<T extends ts.BuilderProgram> extends ts.WatchCompilerHostOfConfigFile<T> {
+  onCachedDirectoryStructureHostCreate(host: CachedDirectoryStructureHost): void;
+}
+
+export {
+  WatchCompilerHostOfConfigFile,
+}
diff --git a/packages/typescript-estree/src/parser.ts b/packages/typescript-estree/src/parser.ts
index 642b41aa4889..f74b1c5a2e2e 100644
--- a/packages/typescript-estree/src/parser.ts
+++ b/packages/typescript-estree/src/parser.ts
@@ -86,6 +86,7 @@ function getASTFromProject(
     calculateProjectParserOptions(code, filePath, extra),
     currentProgram => {
       const ast = currentProgram.getSourceFile(filePath);
+      console.log(ast);
       return ast && { ast, program: currentProgram };
     },
   );
diff --git a/packages/typescript-estree/src/semantic-errors.ts b/packages/typescript-estree/src/semantic-errors.ts
index c580697a185f..40dd69337df6 100644
--- a/packages/typescript-estree/src/semantic-errors.ts
+++ b/packages/typescript-estree/src/semantic-errors.ts
@@ -89,6 +89,7 @@ function whitelistSupportedDiagnostics(
       case 2364: // ts 3.2 "The left-hand side of an assignment expression must be a variable or a property access."
       case 2369: // ts 3.2 "A parameter property is only allowed in a constructor implementation."
       case 2462: // ts 3.2 "A rest element must be last in a destructuring pattern."
+      // case 5056: // #955 - "Cannot write file '{0}' because it would be overwritten by multiple input files."
       case 8017: // ts 3.2 "Octal literal types must use ES2015 syntax. Use the syntax '{0}'."
       case 17012: // ts 3.2 "'{0}' is not a valid meta-property for keyword '{1}'. Did you mean '{2}'?"
       case 17013: // ts 3.2 "Meta-property '{0}' is only allowed in the body of a function declaration, function expression, or constructor."
diff --git a/packages/typescript-estree/src/tsconfig-parser.ts b/packages/typescript-estree/src/tsconfig-parser.ts
index 364dd0543c8e..ffa6a09d5e19 100644
--- a/packages/typescript-estree/src/tsconfig-parser.ts
+++ b/packages/typescript-estree/src/tsconfig-parser.ts
@@ -1,6 +1,7 @@
 import path from 'path';
 import * as ts from 'typescript'; // leave this as * as ts so people using util package don't need syntheticDefaultImports
 import { Extra } from './parser-options';
+import { WatchCompilerHostOfConfigFile } from './WatchCompilerHostOfConfigFile';
 
 //------------------------------------------------------------------------------
 // Environment calculation
@@ -115,7 +116,7 @@ export function calculateProjectParserOptions(
       ts.createSemanticDiagnosticsBuilderProgram,
       diagnosticReporter,
       /*reportWatchStatus*/ () => {},
-    );
+    ) as WatchCompilerHostOfConfigFile<ts.SemanticDiagnosticsBuilderProgram>;
 
     // ensure readFile reads the code being linted instead of the copy on disk
     const oldReadFile = watchCompilerHost.readFile;
@@ -138,14 +139,19 @@ export function calculateProjectParserOptions(
             diag.category === ts.DiagnosticCategory.Error &&
             diag.code !== 18003,
         );
+      console.log(
+        program
+          .getSourceFiles()
+          .map(f => f.fileName)
+          .filter(f => !f.includes('node_modules')),
+      );
       if (configFileDiagnostics.length > 0) {
         diagnosticReporter(configFileDiagnostics[0]);
       }
     };
 
     // register callbacks to trigger program updates without using fileWatchers
-    // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
-    watchCompilerHost.watchFile = (fileName, callback) => {
+    watchCompilerHost.watchFile = (fileName, callback): ts.FileWatcher => {
       const normalizedFileName = path.normalize(fileName);
       watchCallbackTrackingMap.set(normalizedFileName, callback);
       return {
@@ -156,26 +162,14 @@ export function calculateProjectParserOptions(
     };
 
     // ensure fileWatchers aren't created for directories
-    watchCompilerHost.watchDirectory = (): typeof noopFileWatcher =>
-      noopFileWatcher;
+    watchCompilerHost.watchDirectory = (): ts.FileWatcher => noopFileWatcher;
 
-    // we're using internal typescript APIs which aren't on the types
-    /* eslint-disable @typescript-eslint/no-explicit-any */
     // allow files with custom extensions to be included in program (uses internal ts api)
-    const oldOnDirectoryStructureHostCreate = (watchCompilerHost as any)
-      .onCachedDirectoryStructureHostCreate;
-    (watchCompilerHost as any).onCachedDirectoryStructureHostCreate = (
-      host: any,
-    ): void => {
+    const oldOnDirectoryStructureHostCreate =
+      watchCompilerHost.onCachedDirectoryStructureHostCreate;
+    watchCompilerHost.onCachedDirectoryStructureHostCreate = (host): void => {
       const oldReadDirectory = host.readDirectory;
-      // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
-      host.readDirectory = (
-        path: string,
-        extensions?: readonly string[],
-        exclude?: readonly string[],
-        include?: readonly string[],
-        depth?: number,
-      ) =>
+      host.readDirectory = (path, extensions, exclude, include, depth): string[] =>
         oldReadDirectory(
           path,
           !extensions
@@ -187,7 +181,6 @@ export function calculateProjectParserOptions(
         );
       oldOnDirectoryStructureHostCreate(host);
     };
-    /* eslint-enable @typescript-eslint/no-explicit-any */
 
     // create program
     const programWatch = ts.createWatchProgram(watchCompilerHost);
diff --git a/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.js b/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.js
new file mode 100644
index 000000000000..ef92ec1ef9f2
--- /dev/null
+++ b/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.js
@@ -0,0 +1 @@
+console.log('goodbye');
diff --git a/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.ts b/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.ts
new file mode 100644
index 000000000000..652fb67bad79
--- /dev/null
+++ b/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.ts
@@ -0,0 +1 @@
+console.log('henlo');
diff --git a/packages/typescript-estree/tests/fixtures/duplicateFileNames/tsconfig.json b/packages/typescript-estree/tests/fixtures/duplicateFileNames/tsconfig.json
new file mode 100644
index 000000000000..638ea7325469
--- /dev/null
+++ b/packages/typescript-estree/tests/fixtures/duplicateFileNames/tsconfig.json
@@ -0,0 +1,6 @@
+{
+  "include": [
+    "test.js",
+    "test.ts",
+  ]
+}
diff --git a/packages/typescript-estree/tests/lib/parse.ts b/packages/typescript-estree/tests/lib/parse.ts
index 6ed8db76cbc9..d5bf415071d6 100644
--- a/packages/typescript-estree/tests/lib/parse.ts
+++ b/packages/typescript-estree/tests/lib/parse.ts
@@ -297,4 +297,30 @@ describe('parse()', () => {
       });
     });
   });
+
+  describe('duplicate filenames', () => {
+    const PROJECT_DIR = resolve(FIXTURES_DIR, '../duplicateFileNames');
+    const code = 'var a = true';
+    const config: TSESTreeOptions = {
+      comment: true,
+      tokens: true,
+      range: true,
+      loc: true,
+      tsconfigRootDir: PROJECT_DIR,
+      project: './tsconfig.json',
+    };
+    const testParse = (filePath: string): void => {
+      parser.parseAndGenerateServices(code, {
+        ...config,
+        filePath: relative(process.cwd(), join(PROJECT_DIR, filePath)),
+      });
+    };
+
+    it('doesnt error on duplicate filenames', () => {
+      expect(() => {
+        testParse('test.js');
+        testParse('test.ts');
+      }).not.toThrow();
+    });
+  });
 });

From 3cfd333ca05ac1f7407c8a2941459ac783a11820 Mon Sep 17 00:00:00 2001
From: Brad Zacher <brad.zacher@gmail.com>
Date: Fri, 6 Sep 2019 22:33:17 -0700
Subject: [PATCH 2/4] remove test code because it's a lost cause

---
 .vscode/launch.json                           | 14 ++++++++++
 packages/typescript-estree/src/parser.ts      |  1 -
 .../typescript-estree/src/semantic-errors.ts  |  1 -
 .../typescript-estree/src/tsconfig-parser.ts  | 16 +++++++-----
 .../tests/fixtures/duplicateFileNames/test.js |  1 -
 .../tests/fixtures/duplicateFileNames/test.ts |  1 -
 .../fixtures/duplicateFileNames/tsconfig.json |  6 -----
 packages/typescript-estree/tests/lib/parse.ts | 26 -------------------
 8 files changed, 23 insertions(+), 43 deletions(-)
 delete mode 100644 packages/typescript-estree/tests/fixtures/duplicateFileNames/test.js
 delete mode 100644 packages/typescript-estree/tests/fixtures/duplicateFileNames/test.ts
 delete mode 100644 packages/typescript-estree/tests/fixtures/duplicateFileNames/tsconfig.json

diff --git a/.vscode/launch.json b/.vscode/launch.json
index 35c5c3194ec3..1c2b4b3dd803 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -18,6 +18,20 @@
           "sourceMaps": true,
           "console": "integratedTerminal",
           "internalConsoleOptions": "neverOpen"
+      },
+      {
+        "type": "node",
+        "request": "launch",
+        "name": "Run currently opened typescript-estree test",
+        "cwd": "${workspaceFolder}/packages/typescript-estree/",
+        "program": "${workspaceFolder}/node_modules/jest/bin/jest.js",
+        "args": [
+            "--runInBand",
+            "${relativeFile}"
+        ],
+        "sourceMaps": true,
+        "console": "integratedTerminal",
+        "internalConsoleOptions": "neverOpen"
       }
   ]
 }
diff --git a/packages/typescript-estree/src/parser.ts b/packages/typescript-estree/src/parser.ts
index f74b1c5a2e2e..642b41aa4889 100644
--- a/packages/typescript-estree/src/parser.ts
+++ b/packages/typescript-estree/src/parser.ts
@@ -86,7 +86,6 @@ function getASTFromProject(
     calculateProjectParserOptions(code, filePath, extra),
     currentProgram => {
       const ast = currentProgram.getSourceFile(filePath);
-      console.log(ast);
       return ast && { ast, program: currentProgram };
     },
   );
diff --git a/packages/typescript-estree/src/semantic-errors.ts b/packages/typescript-estree/src/semantic-errors.ts
index 40dd69337df6..c580697a185f 100644
--- a/packages/typescript-estree/src/semantic-errors.ts
+++ b/packages/typescript-estree/src/semantic-errors.ts
@@ -89,7 +89,6 @@ function whitelistSupportedDiagnostics(
       case 2364: // ts 3.2 "The left-hand side of an assignment expression must be a variable or a property access."
       case 2369: // ts 3.2 "A parameter property is only allowed in a constructor implementation."
       case 2462: // ts 3.2 "A rest element must be last in a destructuring pattern."
-      // case 5056: // #955 - "Cannot write file '{0}' because it would be overwritten by multiple input files."
       case 8017: // ts 3.2 "Octal literal types must use ES2015 syntax. Use the syntax '{0}'."
       case 17012: // ts 3.2 "'{0}' is not a valid meta-property for keyword '{1}'. Did you mean '{2}'?"
       case 17013: // ts 3.2 "Meta-property '{0}' is only allowed in the body of a function declaration, function expression, or constructor."
diff --git a/packages/typescript-estree/src/tsconfig-parser.ts b/packages/typescript-estree/src/tsconfig-parser.ts
index ffa6a09d5e19..e6ef356b6f30 100644
--- a/packages/typescript-estree/src/tsconfig-parser.ts
+++ b/packages/typescript-estree/src/tsconfig-parser.ts
@@ -14,6 +14,8 @@ export const defaultCompilerOptions: ts.CompilerOptions = {
   allowNonTsExtensions: true,
   allowJs: true,
   checkJs: true,
+  noEmit: true,
+  // extendedDiagnostics: true,
 };
 
 /**
@@ -139,12 +141,6 @@ export function calculateProjectParserOptions(
             diag.category === ts.DiagnosticCategory.Error &&
             diag.code !== 18003,
         );
-      console.log(
-        program
-          .getSourceFiles()
-          .map(f => f.fileName)
-          .filter(f => !f.includes('node_modules')),
-      );
       if (configFileDiagnostics.length > 0) {
         diagnosticReporter(configFileDiagnostics[0]);
       }
@@ -169,7 +165,13 @@ export function calculateProjectParserOptions(
       watchCompilerHost.onCachedDirectoryStructureHostCreate;
     watchCompilerHost.onCachedDirectoryStructureHostCreate = (host): void => {
       const oldReadDirectory = host.readDirectory;
-      host.readDirectory = (path, extensions, exclude, include, depth): string[] =>
+      host.readDirectory = (
+        path,
+        extensions,
+        exclude,
+        include,
+        depth,
+      ): string[] =>
         oldReadDirectory(
           path,
           !extensions
diff --git a/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.js b/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.js
deleted file mode 100644
index ef92ec1ef9f2..000000000000
--- a/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.js
+++ /dev/null
@@ -1 +0,0 @@
-console.log('goodbye');
diff --git a/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.ts b/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.ts
deleted file mode 100644
index 652fb67bad79..000000000000
--- a/packages/typescript-estree/tests/fixtures/duplicateFileNames/test.ts
+++ /dev/null
@@ -1 +0,0 @@
-console.log('henlo');
diff --git a/packages/typescript-estree/tests/fixtures/duplicateFileNames/tsconfig.json b/packages/typescript-estree/tests/fixtures/duplicateFileNames/tsconfig.json
deleted file mode 100644
index 638ea7325469..000000000000
--- a/packages/typescript-estree/tests/fixtures/duplicateFileNames/tsconfig.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "include": [
-    "test.js",
-    "test.ts",
-  ]
-}
diff --git a/packages/typescript-estree/tests/lib/parse.ts b/packages/typescript-estree/tests/lib/parse.ts
index d5bf415071d6..6ed8db76cbc9 100644
--- a/packages/typescript-estree/tests/lib/parse.ts
+++ b/packages/typescript-estree/tests/lib/parse.ts
@@ -297,30 +297,4 @@ describe('parse()', () => {
       });
     });
   });
-
-  describe('duplicate filenames', () => {
-    const PROJECT_DIR = resolve(FIXTURES_DIR, '../duplicateFileNames');
-    const code = 'var a = true';
-    const config: TSESTreeOptions = {
-      comment: true,
-      tokens: true,
-      range: true,
-      loc: true,
-      tsconfigRootDir: PROJECT_DIR,
-      project: './tsconfig.json',
-    };
-    const testParse = (filePath: string): void => {
-      parser.parseAndGenerateServices(code, {
-        ...config,
-        filePath: relative(process.cwd(), join(PROJECT_DIR, filePath)),
-      });
-    };
-
-    it('doesnt error on duplicate filenames', () => {
-      expect(() => {
-        testParse('test.js');
-        testParse('test.ts');
-      }).not.toThrow();
-    });
-  });
 });

From 2b9d8829ef8a166cdd63a5e5520d5686af7afb48 Mon Sep 17 00:00:00 2001
From: Brad Zacher <brad.zacher@gmail.com>
Date: Fri, 6 Sep 2019 22:40:34 -0700
Subject: [PATCH 3/4] docs: document duplicate files not being supported

---
 packages/parser/README.md                     |  4 ++-
 .../src/WatchCompilerHostOfConfigFile.ts      | 27 ++++++++++++++-----
 2 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/packages/parser/README.md b/packages/parser/README.md
index 042fb4f5f540..9fcb9d043633 100644
--- a/packages/parser/README.md
+++ b/packages/parser/README.md
@@ -66,7 +66,9 @@ The following additional configuration options are available by specifying them
     ];
     ```
 
-  - Note that if you use project references, TypeScript will not automatically use project references to resolve files. This means that you will have to add each referenced tsconfig to the `project` field either separately, or via a glob.
+  - If you use project references, TypeScript will not automatically use project references to resolve files. This means that you will have to add each referenced tsconfig to the `project` field either separately, or via a glob.
+
+  - TypeScript will ignore files with duplicate filenames in the same folder (for example, `src/file.ts` and `src/file.js`). TypeScript purposely ignore all but one of the files, only keeping the one file with the highest priority extension (the extension priority order (from highest to lowest) is `.ts`, `.tsx`, `.d.ts`, `.js`, `.jsx`). For more info see #955.
 
   - Note that if this setting is specified and `createDefaultProgram` is not, you must only lint files that are included in the projects as defined by the provided `tsconfig.json` files. If your existing configuration does not include all of the files you would like to lint, you can create a separate `tsconfig.eslint.json` as follows:
 
diff --git a/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts b/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts
index d5185cb2eef3..46a84235bf6b 100644
--- a/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts
+++ b/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts
@@ -9,7 +9,13 @@ interface DirectoryStructureHost {
   // TODO: GH#18217 Optional methods are frequently used as non-optional
   directoryExists?(path: string): boolean;
   getDirectories?(path: string): string[];
-  readDirectory?(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+  readDirectory?(
+    path: string,
+    extensions?: ReadonlyArray<string>,
+    exclude?: ReadonlyArray<string>,
+    include?: ReadonlyArray<string>,
+    depth?: number,
+  ): string[];
   realpath?(path: string): string;
 
   createDirectory?(path: string): void;
@@ -17,13 +23,20 @@ interface DirectoryStructureHost {
 }
 
 interface CachedDirectoryStructureHost extends DirectoryStructureHost {
-  readDirectory(path: string, extensions?: ReadonlyArray<string>, exclude?: ReadonlyArray<string>, include?: ReadonlyArray<string>, depth?: number): string[];
+  readDirectory(
+    path: string,
+    extensions?: ReadonlyArray<string>,
+    exclude?: ReadonlyArray<string>,
+    include?: ReadonlyArray<string>,
+    depth?: number,
+  ): string[];
 }
 
-interface WatchCompilerHostOfConfigFile<T extends ts.BuilderProgram> extends ts.WatchCompilerHostOfConfigFile<T> {
-  onCachedDirectoryStructureHostCreate(host: CachedDirectoryStructureHost): void;
+interface WatchCompilerHostOfConfigFile<T extends ts.BuilderProgram>
+  extends ts.WatchCompilerHostOfConfigFile<T> {
+  onCachedDirectoryStructureHostCreate(
+    host: CachedDirectoryStructureHost,
+  ): void;
 }
 
-export {
-  WatchCompilerHostOfConfigFile,
-}
+export { WatchCompilerHostOfConfigFile };

From 10f96510292981d1dbf8a61fd03c39bbc6c0c39a Mon Sep 17 00:00:00 2001
From: Brad Zacher <brad.zacher@gmail.com>
Date: Fri, 6 Sep 2019 22:50:49 -0700
Subject: [PATCH 4/4] chore: add links for internal types

---
 .../src/WatchCompilerHostOfConfigFile.ts        | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts b/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts
index 46a84235bf6b..7fb4663b985c 100644
--- a/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts
+++ b/packages/typescript-estree/src/WatchCompilerHostOfConfigFile.ts
@@ -1,14 +1,11 @@
-// These types are internal to typescript
+// These types are internal to TS.
+// They have been trimmed down to only include the relevant bits
+// We use some special internal TS apis to help us do our parsing flexibly
 
 import * as ts from 'typescript'; // leave this as * as ts so people using util package don't need syntheticDefaultImports
 
+// https://github.com/microsoft/TypeScript/blob/b84e65db4ea5c39dbaa2ccd6594efe4653318251/src/compiler/watchUtilities.ts#L6-L18
 interface DirectoryStructureHost {
-  fileExists(path: string): boolean;
-  readFile(path: string, encoding?: string): string | undefined;
-
-  // TODO: GH#18217 Optional methods are frequently used as non-optional
-  directoryExists?(path: string): boolean;
-  getDirectories?(path: string): string[];
   readDirectory?(
     path: string,
     extensions?: ReadonlyArray<string>,
@@ -16,12 +13,9 @@ interface DirectoryStructureHost {
     include?: ReadonlyArray<string>,
     depth?: number,
   ): string[];
-  realpath?(path: string): string;
-
-  createDirectory?(path: string): void;
-  writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
 }
 
+// https://github.com/microsoft/TypeScript/blob/b84e65db4ea5c39dbaa2ccd6594efe4653318251/src/compiler/watchUtilities.ts#L25-L35
 interface CachedDirectoryStructureHost extends DirectoryStructureHost {
   readDirectory(
     path: string,
@@ -32,6 +26,7 @@ interface CachedDirectoryStructureHost extends DirectoryStructureHost {
   ): string[];
 }
 
+// https://github.com/microsoft/TypeScript/blob/5d36aab06f12b0a3ba6197eb14e98204ec0195fb/src/compiler/watch.ts#L548-L554
 interface WatchCompilerHostOfConfigFile<T extends ts.BuilderProgram>
   extends ts.WatchCompilerHostOfConfigFile<T> {
   onCachedDirectoryStructureHostCreate(

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