Expose getTypePredicateOfSignature (microsoft#44863)

Author: Gerrit0

src/compiler/types.ts

@@ -4329,7 +4329,7 @@ namespace ts {
          * This should be called in a loop climbing parents of the symbol, so we'll get `N`.
          */
         /* @internal */ getAccessibleSymbolChain(symbol: Symbol, enclosingDeclaration: Node | undefined, meaning: SymbolFlags, useOnlyExternalAliasing: boolean): Symbol[] | undefined;
-        /* @internal */ getTypePredicateOfSignature(signature: Signature): TypePredicate | undefined;
+        getTypePredicateOfSignature(signature: Signature): TypePredicate | undefined;
         /* @internal */ resolveExternalModuleName(moduleSpecifier: Expression): Symbol | undefined;
         /**
          * An external module with an 'export =' declaration resolves to the target of the 'export =' declaration,

tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -2282,6 +2282,7 @@ declare namespace ts {
         getApparentType(type: Type): Type;
         getBaseConstraintOfType(type: Type): Type | undefined;
         getDefaultFromTypeParameter(type: Type): Type | undefined;
+        getTypePredicateOfSignature(signature: Signature): TypePredicate | undefined;
         /**
          * Depending on the operation performed, it may be appropriate to throw away the checker
          * if the cancellation token is triggered. Typically, if it is used for error checking

tests/baselines/reference/api/typescript.d.ts

@@ -2282,6 +2282,7 @@ declare namespace ts {
         getApparentType(type: Type): Type;
         getBaseConstraintOfType(type: Type): Type | undefined;
         getDefaultFromTypeParameter(type: Type): Type | undefined;
+        getTypePredicateOfSignature(signature: Signature): TypePredicate | undefined;
         /**
          * Depending on the operation performed, it may be appropriate to throw away the checker
          * if the cancellation token is triggered. Typically, if it is used for error checking