chore(gatsby): Convert utils/prepare-regex to typescript (#22133)

Author: mottox2

packages/gatsby/src/db/loki/nodes-query.js

@@ -5,7 +5,7 @@ const {
   getNamedType,
   isCompositeType,
 } = require(`graphql`)
-const prepareRegex = require(`../../utils/prepare-regex`)
+const { prepareRegex } = require(`../../utils/prepare-regex`)
 const {
   getNodeTypeCollection,
   ensureFieldIndexes,

packages/gatsby/src/redux/run-sift.js

@@ -1,7 +1,7 @@
 // @flow
 const { default: sift } = require(`sift`)
 const _ = require(`lodash`)
-const prepareRegex = require(`../utils/prepare-regex`)
+const { prepareRegex } = require(`../utils/prepare-regex`)
 const { makeRe } = require(`micromatch`)
 const { getValueAt } = require(`../utils/get-value-at`)
 const {

packages/gatsby/src/utils/__tests__/prepare-regex.js

@@ -1,4 +1,4 @@
-const prepareRegex = require(`../prepare-regex`)
+const { prepareRegex } = require(`../prepare-regex`)
 
 describe(`Prepare regex for Sift.js`, () => {
   it(`handles simple regex`, () => {

packages/gatsby/src/utils/prepare-regex.js packages/gatsby/src/utils/prepare-regex.ts

@@ -1,6 +1,6 @@
-const _ = require(`lodash`)
+import _ from "lodash"
 
-module.exports = str => {
+export const prepareRegex = (str: string): RegExp => {
   const exploded = str.split(`/`)
   const regex = new RegExp(
     exploded