Function addOptionality

test/fixtures/snapshot/typescript.js:55940–55944

(type, isProperty, isOptional)

            return expr.kind === 204 /* SyntaxKind.ArrayLiteralExpression */ && expr.elements.length === 0;
        }
        function addOptionality(type, isProperty, isOptional) {
            if (isProperty === void 0) { isProperty = false; }
            if (isOptional === void 0) { isOptional = true; }
            return strictNullChecks && isOptional ? getOptionalType(type, isProperty) : type;
        }
        // Return the inferred type for a variable, parameter, or property declaration
        function getTypeForVariableLikeDeclaration(declaration, includeOptionality, checkMode) {
            // A variable declared in a for..in statement is of type string, or of type keyof T when the