diff --git a/common/src/__tests__/db.helpers.spec.ts b/common/src/__tests__/db.helpers.spec.ts
new file mode 100644
index 0000000..15f3993
--- /dev/null
+++ b/common/src/__tests__/db.helpers.spec.ts
@@ -0,0 +1,31 @@
+import { stringSanitizer } from "../db.helpers";
+
+declare var global: any;
+global.string = {};
+global.string.gsub = function (
+  str: string,
+  pattern: string,
+  fn: any,
+): [string, number] {
+  const regExp = RegExp(pattern, "g");
+  return [
+    str.replace(regExp, fn),
+    0,
+  ];
+};
+
+describe("Test db.helpers.ts", () => {
+  it("Test string to sanitize", () => {
+    const toSanitize = "'\"\\ \\%\tt\be\0s',\"\x1at\n\r\"'";
+    const res = stringSanitizer(toSanitize);
+
+    expect(res).not.toEqual(toSanitize);
+  });
+
+  it("Test normal string", () => {
+    const toSanitize = "tonotnormalize";
+    const res = stringSanitizer(toSanitize);
+
+    expect(res).toEqual(toSanitize);
+  });
+});
diff --git a/common/src/__tests__/tsconfig.json b/common/src/__tests__/tsconfig.json
new file mode 100644
index 0000000..b5093c8
--- /dev/null
+++ b/common/src/__tests__/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "lib": [
+      "DOM","ESNext"
+    ],
+  },
+  "exclude": []
+}
diff --git a/common/src/db.helpers.d.ts b/common/src/db.helpers.d.ts
new file mode 100644
index 0000000..7fe6f82
--- /dev/null
+++ b/common/src/db.helpers.d.ts
@@ -0,0 +1,7 @@
+/**
+ * Sanitize a string for SQL
+ *
+ * @param str
+ * @returns Sanitized string
+ */
+export declare function stringSanitizer(str: string): string;
diff --git a/common/src/db.helpers.ts b/common/src/db.helpers.ts
new file mode 100644
index 0000000..4fcd9da
--- /dev/null
+++ b/common/src/db.helpers.ts
@@ -0,0 +1,13 @@
+/**
+ * Sanitize a string for SQL
+ *
+ * @param str
+ * @returns Sanitized string
+ */
+export function stringSanitizer(str: string): string {
+  return string.gsub(
+    str,
+    "[';\\, ]",
+    "",
+  )[0];
+}
diff --git a/common/src/declarations/db.helpers.d.ts b/common/src/declarations/db.helpers.d.ts
new file mode 100644
index 0000000..7fe6f82
--- /dev/null
+++ b/common/src/declarations/db.helpers.d.ts
@@ -0,0 +1,7 @@
+/**
+ * Sanitize a string for SQL
+ *
+ * @param str
+ * @returns Sanitized string
+ */
+export declare function stringSanitizer(str: string): string;
diff --git a/common/src/declarations/hook.helpers.d.ts b/common/src/declarations/hook.helpers.d.ts
new file mode 100644
index 0000000..dc8ab04
--- /dev/null
+++ b/common/src/declarations/hook.helpers.d.ts
@@ -0,0 +1,6 @@
+export type IRegisterHook<T> = (hook: T, 
+/** the number of times the function will be called, 0 means "always call this function" */
+shots?: number) => any;
+export type IRegisterHookWithId<T> = (id: number, hook: T, 
+/** the number of times the function will be called, 0 means "always call this function" */
+shots?: number) => any;
diff --git a/common/src/declarations/index.d.ts b/common/src/declarations/index.d.ts
new file mode 100644
index 0000000..538c890
--- /dev/null
+++ b/common/src/declarations/index.d.ts
@@ -0,0 +1,2 @@
+export * from "./hook.helpers";
+export * from "./db.helpers";
diff --git a/common/src/hook.helpers.d.ts b/common/src/hook.helpers.d.ts
new file mode 100644
index 0000000..bf09f95
--- /dev/null
+++ b/common/src/hook.helpers.d.ts
@@ -0,0 +1,6 @@
+export declare type IRegisterHook<T> = (hook: T, 
+/** the number of times the function will be called, 0 means "always call this function" */
+shots?: number) => any;
+export declare type IRegisterHookWithId<T> = (id: number, hook: T, 
+/** the number of times the function will be called, 0 means "always call this function" */
+shots?: number) => any;
diff --git a/common/src/hook.helpers.ts b/common/src/hook.helpers.ts
new file mode 100644
index 0000000..c535a82
--- /dev/null
+++ b/common/src/hook.helpers.ts
@@ -0,0 +1,12 @@
+export type IRegisterHook<T> = (
+  hook: T,
+  /** the number of times the function will be called, 0 means "always call this function" */
+  shots?: number
+) => any;
+
+export type IRegisterHookWithId<T> = (
+  id: number,
+  hook: T,
+  /** the number of times the function will be called, 0 means "always call this function" */
+  shots?: number,
+) => any;
diff --git a/common/src/index.d.ts b/common/src/index.d.ts
new file mode 100644
index 0000000..538c890
--- /dev/null
+++ b/common/src/index.d.ts
@@ -0,0 +1,2 @@
+export * from "./hook.helpers";
+export * from "./db.helpers";
diff --git a/common/src/index.ts b/common/src/index.ts
new file mode 100644
index 0000000..c74c8ce
--- /dev/null
+++ b/common/src/index.ts
@@ -0,0 +1,2 @@
+export * from "./hook.helpers"
+export * from "./db.helpers"