[api-extractor] Upgrade the TypeScript engine to 4.3

apps/api-extractor/package.json

@@ -45,7 +45,7 @@
     "resolve": "~1.17.0",
     "semver": "~7.3.0",
     "source-map": "~0.6.1",
-    "typescript": "~4.2.4"
+    "typescript": "~4.3.2"
   },
   "devDependencies": {
     "@rushstack/eslint-config": "workspace:*",

apps/api-extractor/src/analyzer/AstSymbolTable.ts

@@ -480,12 +480,12 @@ export class AstSymbolTable {
     const followedSymbol: ts.Symbol = options.followedSymbol;
 
     // Filter out symbols representing constructs that we don't care about
-    if (!TypeScriptHelpers.hasAnyDeclarations(followedSymbol)) {
+    const arbitraryDeclaration: ts.Declaration | undefined =
+      TypeScriptHelpers.tryGetADeclaration(followedSymbol);
+    if (!arbitraryDeclaration) {
       return undefined;
     }
 
-    const arbitraryDeclaration: ts.Declaration = followedSymbol.declarations[0];
-
     if (
       // eslint-disable-next-line no-bitwise
       followedSymbol.flags &
@@ -557,24 +557,28 @@ export class AstSymbolTable {
         // - but P1 and P2 may be different (e.g. merged namespaces containing merged interfaces)
 
         // Is there a parent AstSymbol?  First we check to see if there is a parent declaration:
-        const arbitraryParentDeclaration: ts.Node | undefined = this._tryFindFirstAstDeclarationParent(
-          followedSymbol.declarations[0]
-        );
-
-        if (arbitraryParentDeclaration) {
-          const parentSymbol: ts.Symbol = TypeScriptHelpers.getSymbolForDeclaration(
-            arbitraryParentDeclaration as ts.Declaration,
-            this._typeChecker
-          );
+        const arbitraryDeclaration: ts.Node | undefined =
+          TypeScriptHelpers.tryGetADeclaration(followedSymbol);
+
+        if (arbitraryDeclaration) {
+          const arbitraryParentDeclaration: ts.Node | undefined =
+            this._tryFindFirstAstDeclarationParent(arbitraryDeclaration);
 
-          parentAstSymbol = this._fetchAstSymbol({
-            followedSymbol: parentSymbol,
-            isExternal: options.isExternal,
-            includeNominalAnalysis: false,
-            addIfMissing: true
-          });
-          if (!parentAstSymbol) {
-            throw new InternalError('Unable to construct a parent AstSymbol for ' + followedSymbol.name);
+          if (arbitraryParentDeclaration) {
+            const parentSymbol: ts.Symbol = TypeScriptHelpers.getSymbolForDeclaration(
+              arbitraryParentDeclaration as ts.Declaration,
+              this._typeChecker
+            );
+
+            parentAstSymbol = this._fetchAstSymbol({
+              followedSymbol: parentSymbol,
+              isExternal: options.isExternal,
+              includeNominalAnalysis: false,
+              addIfMissing: true
+            });
+            if (!parentAstSymbol) {
+              throw new InternalError('Unable to construct a parent AstSymbol for ' + followedSymbol.name);
+            }
           }
         }
       }

apps/api-extractor/src/analyzer/ExportAnalyzer.ts

@@ -131,7 +131,9 @@ export class ExportAnalyzer {
           );
 
           // Ignore virtual symbols that don't have any declarations
-          if (TypeScriptHelpers.hasAnyDeclarations(followedSymbol)) {
+          const arbitraryDeclaration: ts.Declaration | undefined =
+            TypeScriptHelpers.tryGetADeclaration(followedSymbol);
+          if (arbitraryDeclaration) {
             const astSymbol: AstSymbol | undefined = this._astSymbolTable.fetchAstSymbol({
               followedSymbol: followedSymbol,
               isExternal: astModule.isExternal,
@@ -142,7 +144,7 @@ export class ExportAnalyzer {
             if (!astSymbol) {
               throw new Error(
                 `Unsupported export ${JSON.stringify(exportedSymbol.name)}:\n` +
-                  SourceFileLocationFormatter.formatDeclaration(followedSymbol.declarations[0])
+                  SourceFileLocationFormatter.formatDeclaration(arbitraryDeclaration)
               );
             }
 

apps/api-extractor/src/analyzer/Span.ts

@@ -142,7 +142,16 @@ export class Span {
 
     let previousChildSpan: Span | undefined = undefined;
 
+    const visitedChildren: Set<ts.Node> = new Set();
+
     for (const childNode of this.node.getChildren() || []) {
+      // FIX ME: This is a temporary workaround for a problem introduced by TypeScript 4.3.
+      // https://github.com/microsoft/TypeScript/issues/44422
+      if (visitedChildren.has(childNode)) {
+        continue;
+      }
+      visitedChildren.add(childNode);
+
       const childSpan: Span = new Span(childNode);
       childSpan._parent = this;
       childSpan._previousSibling = previousChildSpan;

apps/api-extractor/src/analyzer/TypeScriptHelpers.ts

@@ -66,8 +66,11 @@ export class TypeScriptHelpers {
    * sometimes return a "prototype" symbol for an object, even though there is no corresponding declaration in the
    * source code.  API Extractor generally ignores such symbols.
    */
-  public static hasAnyDeclarations(symbol: ts.Symbol): boolean {
-    return symbol.declarations && symbol.declarations.length > 0;
+  public static tryGetADeclaration(symbol: ts.Symbol): ts.Declaration | undefined {
+    if (symbol.declarations && symbol.declarations.length > 0) {
+      return symbol.declarations[0];
+    }
+    return undefined;
   }
 
   /**
@@ -272,13 +275,11 @@ export class TypeScriptHelpers {
       {
         onEmitNode(
           hint: ts.EmitHint,
-          node: ts.Node | undefined,
-          emit: (hint: ts.EmitHint, node: ts.Node | undefined) => void
+          node: ts.Node,
+          emitCallback: (hint: ts.EmitHint, node: ts.Node) => void
         ): void {
-          if (node) {
-            ts.setEmitFlags(declarationName, ts.EmitFlags.NoIndentation | ts.EmitFlags.SingleLine);
-          }
-          emit(hint, node);
+          ts.setEmitFlags(declarationName, ts.EmitFlags.NoIndentation | ts.EmitFlags.SingleLine);
+          emitCallback(hint, node);
         }
       }
     );

common/changes/@microsoft/api-extractor/octogonz-typescript-4.3_2021-06-03-21-12.json

@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@microsoft/api-extractor",
+      "comment": "Upgrade the bundled compiler engine to TypeScript 4.3",
+      "type": "minor"
+    }
+  ],
+  "packageName": "@microsoft/api-extractor",
+  "email": "[email protected]"
+}

common/config/rush/common-versions.json

@@ -63,7 +63,7 @@
      * For example, allow some projects to use an older TypeScript compiler
      * (in addition to whatever "usual" version is being used by other projects in the repo):
      */
-    "typescript": ["~2.4.2", "~2.9.2", "~4.2.4"],
+    "typescript": ["~2.4.2", "~2.9.2", "~4.2.4", "~4.3.2"],
 
     "source-map": [
       "~0.6.1" // API Extractor is using an older version of source-map because newer versions are async

common/config/rush/repo-state.json

@@ -1,5 +1,5 @@
 // DO NOT MODIFY THIS FILE MANUALLY BUT DO COMMIT IT. It is generated and used by Rush.
 {
-  "pnpmShrinkwrapHash": "c7f96d34a06a3bf954c5b2f32777981c2a21717f",
+  "pnpmShrinkwrapHash": "99943da203445c1a464347d118d09c72903e7e73",
   "preferredVersionsHash": "6a96c5550f3ce50aa19e8d1141c6c5d4176953ff"
 }