chore: migrate jest-docblock to TypeScript

[SimenB]

Summary

Built diff:

diff --git c/packages/jest-docblock/build/index.js w/packages/jest-docblock/build/index.js
index 8c60ffcd1..24f2b052c 100644
--- c/packages/jest-docblock/build/index.js
+++ w/packages/jest-docblock/build/index.js
@@ -9,20 +9,20 @@ exports.parse = parse;
 exports.parseWithComments = parseWithComments;
 exports.print = print;
 
-function _detectNewline() {
-  const data = _interopRequireDefault(require('detect-newline'));
+function _os() {
+  const data = require('os');
 
-  _detectNewline = function _detectNewline() {
+  _os = function _os() {
     return data;
   };
 
   return data;
 }
 
-function _os() {
-  const data = require('os');
+function _detectNewline() {
+  const data = _interopRequireDefault(require('detect-newline'));
 
-  _os = function _os() {
+  _detectNewline = function _detectNewline() {
     return data;
   };
 
@@ -38,8 +38,6 @@ function _interopRequireDefault(obj) {
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- *
  */
 const commentEndRe = /\*\/$/;
 const commentStartRe = /^\/\*\*/;

Test plan

Green CI

[github-actions]

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