Function ensureUseStrict

test/fixtures/snapshot/typescript.js:27060–27066

* Ensures "use strict" directive is added * * @param statements An array of statements

(statements)

         * @param statements An array of statements
         */
        function ensureUseStrict(statements) {
            var foundUseStrict = ts.findUseStrictPrologue(statements);
            if (!foundUseStrict) {
                return ts.setTextRange(createNodeArray(__spreadArray([createUseStrictPrologue()], statements, true)), statements);
            }
            return statements;
        }
        /**
         * Lifts a NodeArray containing only Statement nodes to a block.
         *