diff --git a/packages/compiler/src/output/abstract_emitter.ts b/packages/compiler/src/output/abstract_emitter.ts
index ff10e36a4a..3c809fa590 100644
--- a/packages/compiler/src/output/abstract_emitter.ts
+++ b/packages/compiler/src/output/abstract_emitter.ts
@@ -36,6 +36,10 @@ export class EmitterVisitorContext {
 
   constructor(private _indent: number) { this._lines = [new _EmittedLine(_indent)]; }
 
+  /**
+   * @internal strip this from published d.ts files due to
+   * https://github.com/microsoft/TypeScript/issues/36216
+   */
   private get _currentLine(): _EmittedLine { return this._lines[this._lines.length - 1]; }
 
   println(from?: {sourceSpan: ParseSourceSpan | null}|null, lastPart: string = ''): void {
@@ -169,6 +173,10 @@ export class EmitterVisitorContext {
     return null;
   }
 
+  /**
+   * @internal strip this from published d.ts files due to
+   * https://github.com/microsoft/TypeScript/issues/36216
+   */
   private get sourceLines(): _EmittedLine[] {
     if (this._lines.length && this._lines[this._lines.length - 1].parts.length === 0) {
       return this._lines.slice(0, -1);
diff --git a/packages/compiler/src/output/source_map.ts b/packages/compiler/src/output/source_map.ts
index 595e94221c..359e5fb071 100644
--- a/packages/compiler/src/output/source_map.ts
+++ b/packages/compiler/src/output/source_map.ts
@@ -74,6 +74,10 @@ export class SourceMapGenerator {
     return this;
   }
 
+  /**
+  * @internal strip this from published d.ts files due to
+  * https://github.com/microsoft/TypeScript/issues/36216
+  */
   private get currentLine(): Segment[]|null { return this.lines.slice(-1)[0]; }
 
   toJSON(): SourceMap|null {
diff --git a/packages/core/testing/src/r3_test_bed.ts b/packages/core/testing/src/r3_test_bed.ts
index 3f4b285e57..6a749280fe 100644
--- a/packages/core/testing/src/r3_test_bed.ts
+++ b/packages/core/testing/src/r3_test_bed.ts
@@ -351,6 +351,10 @@ export class TestBedRender3 implements TestBed {
     return fixture;
   }
 
+  /**
+   * @internal strip this from published d.ts files due to
+   * https://github.com/microsoft/TypeScript/issues/36216
+   */
   private get compiler(): R3TestBedCompiler {
     if (this._compiler === null) {
       throw new Error(`Need to call TestBed.initTestEnvironment() first`);
@@ -358,6 +362,10 @@ export class TestBedRender3 implements TestBed {
     return this._compiler;
   }
 
+  /**
+   * @internal strip this from published d.ts files due to
+   * https://github.com/microsoft/TypeScript/issues/36216
+   */
   private get testModuleRef(): NgModuleRef<any> {
     if (this._testModuleRef === null) {
       this._testModuleRef = this.compiler.finalize();