Function getBaseSignature

test/fixtures/snapshot/typescript.js:59983–60002

(signature)

            return getSignatureInstantiation(signature, ts.map(signature.typeParameters, function (tp) { return tp.target && !getConstraintOfTypeParameter(tp.target) ? tp.target : tp; }), ts.isInJSFile(signature.declaration));
        }
        function getBaseSignature(signature) {
            var typeParameters = signature.typeParameters;
            if (typeParameters) {
                if (signature.baseSignatureCache) {
                    return signature.baseSignatureCache;
                }
                var typeEraser = createTypeEraser(typeParameters);
                var baseConstraintMapper_1 = createTypeMapper(typeParameters, ts.map(typeParameters, function (tp) { return getConstraintOfTypeParameter(tp) || unknownType; }));
                var baseConstraints = ts.map(typeParameters, function (tp) { return instantiateType(tp, baseConstraintMapper_1) || unknownType; });
                // Run N type params thru the immediate constraint mapper up to N times
                // This way any noncircular interdependent type parameters are definitely resolved to their external dependencies
                for (var i = 0; i < typeParameters.length - 1; i++) {
                    baseConstraints = instantiateTypes(baseConstraints, baseConstraintMapper_1);
                }
                // and then apply a type eraser to remove any remaining circularly dependent type parameters
                baseConstraints = instantiateTypes(baseConstraints, typeEraser);
                return signature.baseSignatureCache = instantiateSignature(signature, createTypeMapper(typeParameters, baseConstraints), /*eraseTypeParameters*/ true);
            }
            return signature;
        }
        function getOrCreateTypeFromSignature(signature) {
            var _a;
            // There are two ways to declare a construct signature, one is by declaring a class constructor