chore(ts): fix errors related to this keyword

app.ts:22:24 - error TS2683: 'this' implicitly has type 'any' because it does not have a type annotation.
app.ts:20:42 An outer value of 'this' is shadowed by this container.

Correction for cd71fb1 commit.

Part of #35

Author: php-coder

examples/ts/express/mysql/app.ts

@@ -13,11 +13,11 @@ const pool = mysql.createPool({
     password: process.env.DB_PASSWORD,
     database: process.env.DB_NAME,
     // Support of named placeholders (https://github.com/mysqljs/mysql#custom-format)
-    queryFormat: function(query, values) {
+    queryFormat: function(this: mysql.Pool, query, values) {
         if (!values) {
             return query
         }
-        return query.replace(/\:(\w+)/g, function(matchedSubstring: string, capturedValue: string) {
+        return query.replace(/\:(\w+)/g, function(this: mysql.Pool, matchedSubstring: string, capturedValue: string) {
             if (values.hasOwnProperty(capturedValue)) {
                 return this.escape(values[capturedValue])
             }

src/templates/app.ts.ejs

@@ -13,12 +13,12 @@ const pool = mysql.createPool({
     password: process.env.DB_PASSWORD,
     database: process.env.DB_NAME,
     // Support of named placeholders (https://github.com/mysqljs/mysql#custom-format)
-    queryFormat: function(query, values) {
+    queryFormat: function(this: mysql.Pool, query, values) {
         if (!values) {
             return query
         }
 <%- // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace#specifying_a_function_as_the_replacement -%>
-        return query.replace(/\:(\w+)/g, function(matchedSubstring: string, capturedValue: string) {
+        return query.replace(/\:(\w+)/g, function(this: mysql.Pool, matchedSubstring: string, capturedValue: string) {
             if (values.hasOwnProperty(capturedValue)) {
                 return this.escape(values[capturedValue])
             }