Fix tsc --watch crash on module augmentations when module resolution changes

src/compiler/builderState.ts

@@ -206,6 +206,9 @@ namespace ts {
             const hasCalledUpdateShapeSignature = new Set<Path>();
             const useOldState = canReuseOldState(referencedMap, oldState);
 
+            // Ensure source files have parent pointers set
+            newProgram.getTypeChecker();
+
             // Create the reference map, and set the file infos
             for (const sourceFile of newProgram.getSourceFiles()) {
                 const version = Debug.checkDefined(sourceFile.version, "Program intended to be used with Builder should have source files with versions set");

src/testRunner/unittests/tscWatch/programUpdates.ts

@@ -481,6 +481,26 @@ export class A {
             changes: emptyArray
         });
 
+        verifyTscWatch({
+            scenario,
+            subScenario: "change module to none",
+            commandLineArgs: ["-w", "-p", configFilePath],
+            sys: () => {
+                const file1 = {
+                    path: "/a/b/f1.ts",
+                    content: "export {}\ndeclare global {}"
+                };
+                return createWatchedSystem([file1, libFile, configFile]);
+            },
+            changes: [{
+                caption: "change `module` to 'none'",
+                timeouts: checkSingleTimeoutQueueLengthAndRun,
+                change: sys => {
+                    sys.writeFile(configFilePath, JSON.stringify({ compilerOptions: { module: "none" } }));
+                }
+            }]
+        });
+
         it("correctly migrate files between projects", () => {
             const file1 = {
                 path: "/a/b/f1.ts",

tests/baselines/reference/tscWatch/programUpdates/change-module-to-none.js

@@ -0,0 +1,117 @@
+Input::
+//// [/a/b/f1.ts]
+export {}
+declare global {}
+
+//// [/a/lib/lib.d.ts]
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+
+//// [/a/b/tsconfig.json]
+{}
+
+
+/a/lib/tsc.js -w -p /a/b/tsconfig.json
+Output::
+>> Screen clear
+[12:00:15 AM] Starting compilation in watch mode...
+
+
+[12:00:18 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/a/b/f1.ts"]
+Program options: {"watch":true,"project":"/a/b/tsconfig.json","configFilePath":"/a/b/tsconfig.json"}
+Program files::
+/a/lib/lib.d.ts
+/a/b/f1.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.d.ts
+/a/b/f1.ts
+
+WatchedFiles::
+/a/b/tsconfig.json:
+  {"fileName":"/a/b/tsconfig.json","pollingInterval":250}
+/a/b/f1.ts:
+  {"fileName":"/a/b/f1.ts","pollingInterval":250}
+/a/lib/lib.d.ts:
+  {"fileName":"/a/lib/lib.d.ts","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/a/b/node_modules/@types:
+  {"directoryName":"/a/b/node_modules/@types","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/a/b:
+  {"directoryName":"/a/b","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/a/b/f1.js]
+"use strict";
+exports.__esModule = true;
+
+
+
+Change:: change `module` to 'none'
+
+Input::
+//// [/a/b/tsconfig.json]
+{"compilerOptions":{"module":"none"}}
+
+
+Output::
+>> Screen clear
+[12:00:22 AM] File change detected. Starting incremental compilation...
+
+
+a/b/f1.ts:1:1 - error TS1148: Cannot use imports, exports, or module augmentations when '--module' is 'none'.
+
+1 export {}
+  ~~~~~~~~~
+
+
+[12:00:26 AM] Found 1 error. Watching for file changes.
+
+
+
+Program root files: ["/a/b/f1.ts"]
+Program options: {"module":0,"watch":true,"project":"/a/b/tsconfig.json","configFilePath":"/a/b/tsconfig.json"}
+Program files::
+/a/lib/lib.d.ts
+/a/b/f1.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.d.ts
+/a/b/f1.ts
+
+WatchedFiles::
+/a/b/tsconfig.json:
+  {"fileName":"/a/b/tsconfig.json","pollingInterval":250}
+/a/b/f1.ts:
+  {"fileName":"/a/b/f1.ts","pollingInterval":250}
+/a/lib/lib.d.ts:
+  {"fileName":"/a/lib/lib.d.ts","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/a/b:
+  {"directoryName":"/a/b","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/a/b/node_modules/@types:
+  {"directoryName":"/a/b/node_modules/@types","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/a/b/f1.js] file written with same contents