diff --git a/packages/string-templates/src/conversion/index.ts b/packages/string-templates/src/conversion/index.ts
index 1fb8d97467..d69576e940 100644
--- a/packages/string-templates/src/conversion/index.ts
+++ b/packages/string-templates/src/conversion/index.ts
@@ -1,11 +1,11 @@
 import { getJsHelperList } from "../helpers"
 
-function getLayers(fullBlock) {
+function getLayers(fullBlock: string): string[] {
   let layers = []
   while (fullBlock.length) {
     const start = fullBlock.lastIndexOf("("),
       end = fullBlock.indexOf(")")
-    let layer
+    let layer: string
     if (start === -1 || end === -1) {
       layer = fullBlock.trim()
       fullBlock = ""
@@ -21,7 +21,7 @@ function getLayers(fullBlock) {
   return layers
 }
 
-function getVariable(variableName) {
+function getVariable(variableName: string) {
   if (!variableName || typeof variableName !== "string") {
     return variableName
   }
@@ -47,10 +47,12 @@ function getVariable(variableName) {
   return `$("${variableName}")`
 }
 
-function buildList(parts, value) {
+function buildList(parts: any[], value: any) {
   function build() {
     return parts
-      .map(part => (part.startsWith("helper") ? part : getVariable(part)))
+      .map((part: string) =>
+        part.startsWith("helper") ? part : getVariable(part)
+      )
       .join(", ")
   }
   if (!value) {
@@ -60,12 +62,12 @@ function buildList(parts, value) {
   }
 }
 
-function splitBySpace(layer) {
+function splitBySpace(layer: string) {
   const parts = []
   let started = null,
     endChar = null,
     last = 0
-  function add(str) {
+  function add(str: string) {
     const startsWith = ["]"]
     while (startsWith.indexOf(str.substring(0, 1)) !== -1) {
       str = str.substring(1, str.length)
@@ -103,7 +105,7 @@ function splitBySpace(layer) {
   return parts
 }
 
-export function convertHBSBlock(block, blockNumber) {
+export function convertHBSBlock(block: string, blockNumber: number) {
   const braceLength = block[2] === "{" ? 3 : 2
   block = block.substring(braceLength, block.length - braceLength).trim()
   const layers = getLayers(block)
diff --git a/packages/string-templates/src/index.ts b/packages/string-templates/src/index.ts
index 7d0f198772..67ec194e84 100644
--- a/packages/string-templates/src/index.ts
+++ b/packages/string-templates/src/index.ts
@@ -1,4 +1,4 @@
-import { createContext, runInNewContext } from "vm"
+import { Context, createContext, runInNewContext } from "vm"
 import { create } from "handlebars"
 import { registerAll, registerMinimum } from "./helpers/index"
 import { preprocess, postprocess } from "./processors"
@@ -15,6 +15,7 @@ import { setJSRunner, removeJSRunner } from "./helpers/javascript"
 import { helpersToRemoveForJs } from "./helpers/list"
 
 import manifest from "../manifest.json"
+import { ProcessOptions } from "./types"
 
 export { setJSRunner, setOnErrorLog } from "./helpers/javascript"
 
@@ -22,7 +23,7 @@ const hbsInstance = create()
 registerAll(hbsInstance)
 const hbsInstanceNoHelpers = create()
 registerMinimum(hbsInstanceNoHelpers)
-const defaultOpts = {
+const defaultOpts: ProcessOptions = {
   noHelpers: false,
   cacheTemplates: false,
   noEscaping: false,
@@ -33,7 +34,7 @@ const defaultOpts = {
 /**
  * Utility function to check if the object is valid.
  */
-function testObject(object) {
+function testObject(object: any) {
   // JSON stringify will fail if there are any cycles, stops infinite recursion
   try {
     JSON.stringify(object)
@@ -46,7 +47,7 @@ function testObject(object) {
  * Creates a HBS template function for a given string, and optionally caches it.
  */
 let templateCache = {}
-function createTemplate(string, opts) {
+function createTemplate(string: string, opts: ProcessOptions) {
   opts = { ...defaultOpts, ...opts }
 
   // Finalising adds a helper, can't do this with no helpers
@@ -82,7 +83,11 @@ function createTemplate(string, opts) {
  * @param {object|undefined} [opts] optional - specify some options for processing.
  * @returns {Promise<object|array>} The structure input, as fully updated as possible.
  */
-export async function processObject(object, context, opts?) {
+export async function processObject(
+  object: { [x: string]: any },
+  context: object,
+  opts?: { noHelpers?: boolean; escapeNewlines?: boolean; onlyFound?: boolean }
+) {
   testObject(object)
   for (let key of Object.keys(object || {})) {
     if (object[key] != null) {
@@ -123,7 +128,11 @@ export async function processString(
  * @param {object|undefined} [opts] optional - specify some options for processing.
  * @returns {object|array} The structure input, as fully updated as possible.
  */
-export function processObjectSync(object, context, opts) {
+export function processObjectSync(
+  object: { [x: string]: any },
+  context: any,
+  opts: any
+) {
   testObject(object)
   for (let key of Object.keys(object || {})) {
     let val = object[key]
@@ -144,13 +153,17 @@ export function processObjectSync(object, context, opts) {
  * @param {object|undefined} [opts] optional - specify some options for processing.
  * @returns {string} The enriched string, all templates should have been replaced if they can be.
  */
-export function processStringSync(string, context, opts?) {
+export function processStringSync(
+  string: string,
+  context: object,
+  opts?: { noHelpers?: boolean; escapeNewlines?: boolean; onlyFound: any }
+) {
   // Take a copy of input in case of error
   const input = string
   if (typeof string !== "string") {
     throw "Cannot process non-string types."
   }
-  function process(stringPart) {
+  function process(stringPart: string) {
     const template = createTemplate(stringPart, opts)
     const now = Math.floor(Date.now() / 1000) * 1000
     return postprocess(
@@ -186,7 +199,7 @@ export function processStringSync(string, context, opts?) {
  * this function will find any double braces and switch to triple.
  * @param string the string to have double HBS statements converted to triple.
  */
-export function disableEscaping(string) {
+export function disableEscaping(string: string) {
   const matches = findDoubleHbsInstances(string)
   if (matches == null) {
     return string
@@ -207,7 +220,7 @@ export function disableEscaping(string) {
  * @param {string} property The property which is to be wrapped.
  * @returns {string} The wrapped property ready to be added to a templating string.
  */
-export function makePropSafe(property) {
+export function makePropSafe(property: any) {
   return `[${property}]`.replace("[[", "[").replace("]]", "]")
 }
 
@@ -217,7 +230,7 @@ export function makePropSafe(property) {
  * @param [opts] optional - specify some options for processing.
  * @returns {boolean} Whether or not the input string is valid.
  */
-export function isValid(string, opts?) {
+export function isValid(string: any, opts?: any) {
   const validCases = [
     "string",
     "number",
@@ -268,7 +281,7 @@ export function getManifest() {
  * @param handlebars the HBS expression to check
  * @returns {boolean} whether the expression is JS or not
  */
-export function isJSBinding(handlebars) {
+export function isJSBinding(handlebars: any) {
   return decodeJSBinding(handlebars) != null
 }
 
@@ -277,7 +290,7 @@ export function isJSBinding(handlebars) {
  * @param javascript the JS code to encode
  * @returns {string} the JS HBS expression
  */
-export function encodeJSBinding(javascript) {
+export function encodeJSBinding(javascript: string) {
   return `{{ js "${btoa(javascript)}" }}`
 }
 
@@ -286,7 +299,7 @@ export function encodeJSBinding(javascript) {
  * @param handlebars the JS HBS expression
  * @returns {string|null} the raw JS code
  */
-export function decodeJSBinding(handlebars) {
+export function decodeJSBinding(handlebars: string) {
   if (!handlebars || typeof handlebars !== "string") {
     return null
   }
@@ -311,7 +324,7 @@ export function decodeJSBinding(handlebars) {
  * @param {string[]} strings The strings to look for.
  * @returns {boolean} Will return true if all strings found in HBS statement.
  */
-export function doesContainStrings(template, strings) {
+export function doesContainStrings(template: string, strings: any[]) {
   let regexp = new RegExp(FIND_HBS_REGEX)
   let matches = template.match(regexp)
   if (matches == null) {
@@ -341,7 +354,7 @@ export function doesContainStrings(template, strings) {
  * @param {string} string The string to search within.
  * @return {string[]} The found HBS blocks.
  */
-export function findHBSBlocks(string) {
+export function findHBSBlocks(string: string) {
   if (!string || typeof string !== "string") {
     return []
   }
@@ -362,11 +375,11 @@ export function findHBSBlocks(string) {
  * @param {string} string The word or sentence to search for.
  * @returns {boolean} The this return true if the string is found, false if not.
  */
-export function doesContainString(template, string) {
+export function doesContainString(template: any, string: any) {
   return doesContainStrings(template, [string])
 }
 
-export function convertToJS(hbs) {
+export function convertToJS(hbs: string) {
   const blocks = findHBSBlocks(hbs)
   let js = "return `",
     prevBlock: string | null = null
@@ -407,7 +420,7 @@ function defaultJSSetup() {
     /**
      * Use polyfilled vm to run JS scripts in a browser Env
      */
-    setJSRunner((js, context) => {
+    setJSRunner((js: string, context: Context) => {
       context = {
         ...context,
         alert: undefined,
diff --git a/packages/string-templates/src/processors/index.ts b/packages/string-templates/src/processors/index.ts
index e1743b2f4c..308ac5adf4 100644
--- a/packages/string-templates/src/processors/index.ts
+++ b/packages/string-templates/src/processors/index.ts
@@ -1,8 +1,9 @@
 import { FIND_HBS_REGEX } from "../utilities"
 import * as preprocessor from "./preprocessor"
 import * as postprocessor from "./postprocessor"
+import { ProcessOptions } from "../types"
 
-function process(output, processors, opts?) {
+function process(output: string, processors: any[], opts?: ProcessOptions) {
   for (let processor of processors) {
     // if a literal statement has occurred stop
     if (typeof output !== "string") {
@@ -21,7 +22,7 @@ function process(output, processors, opts?) {
   return output
 }
 
-export function preprocess(string, opts) {
+export function preprocess(string: string, opts: ProcessOptions) {
   let processors = preprocessor.processors
   if (opts.noFinalise) {
     processors = processors.filter(
@@ -30,7 +31,7 @@ export function preprocess(string, opts) {
   }
   return process(string, processors, opts)
 }
-export function postprocess(string) {
+export function postprocess(string: string) {
   let processors = postprocessor.processors
   return process(string, processors)
 }
diff --git a/packages/string-templates/src/processors/postprocessor.ts b/packages/string-templates/src/processors/postprocessor.ts
index 39125b225a..6f7260718b 100644
--- a/packages/string-templates/src/processors/postprocessor.ts
+++ b/packages/string-templates/src/processors/postprocessor.ts
@@ -6,45 +6,51 @@ export const PostProcessorNames = {
 
 /* eslint-disable no-unused-vars */
 class Postprocessor {
-  name
-  private fn
+  name: string
+  private fn: any
 
-  constructor(name, fn) {
+  constructor(name: string, fn: any) {
     this.name = name
     this.fn = fn
   }
 
-  process(statement) {
+  process(statement: any) {
     return this.fn(statement)
   }
 }
 
 export const processors = [
-  new Postprocessor(PostProcessorNames.CONVERT_LITERALS, statement => {
-    if (typeof statement !== "string" || !statement.includes(LITERAL_MARKER)) {
-      return statement
+  new Postprocessor(
+    PostProcessorNames.CONVERT_LITERALS,
+    (statement: string) => {
+      if (
+        typeof statement !== "string" ||
+        !statement.includes(LITERAL_MARKER)
+      ) {
+        return statement
+      }
+      const splitMarkerIndex = statement.indexOf("-")
+      const type = statement.substring(12, splitMarkerIndex)
+      const value = statement.substring(
+        splitMarkerIndex + 1,
+        statement.length - 2
+      )
+      switch (type) {
+        case "string":
+          return value
+        case "number":
+          return parseFloat(value)
+        case "boolean":
+          return value === "true"
+        case "object":
+          return JSON.parse(value)
+        case "js_result":
+          // We use the literal helper to process the result of JS expressions
+          // as we want to be able to return any types.
+          // We wrap the value in an abject to be able to use undefined properly.
+          return JSON.parse(value).data
+      }
+      return value
     }
-    const splitMarkerIndex = statement.indexOf("-")
-    const type = statement.substring(12, splitMarkerIndex)
-    const value = statement.substring(
-      splitMarkerIndex + 1,
-      statement.length - 2
-    )
-    switch (type) {
-      case "string":
-        return value
-      case "number":
-        return parseFloat(value)
-      case "boolean":
-        return value === "true"
-      case "object":
-        return JSON.parse(value)
-      case "js_result":
-        // We use the literal helper to process the result of JS expressions
-        // as we want to be able to return any types.
-        // We wrap the value in an abject to be able to use undefined properly.
-        return JSON.parse(value).data
-    }
-    return value
-  }),
+  ),
 ]
diff --git a/packages/string-templates/src/processors/preprocessor.ts b/packages/string-templates/src/processors/preprocessor.ts
index 1fcbac629f..141b2be3a9 100644
--- a/packages/string-templates/src/processors/preprocessor.ts
+++ b/packages/string-templates/src/processors/preprocessor.ts
@@ -14,7 +14,7 @@ class Preprocessor {
   name: string
   private fn: any
 
-  constructor(name, fn) {
+  constructor(name: string, fn: any) {
     this.name = name
     this.fn = fn
   }
@@ -27,7 +27,7 @@ class Preprocessor {
 }
 
 export const processors = [
-  new Preprocessor(PreprocessorNames.SWAP_TO_DOT, statement => {
+  new Preprocessor(PreprocessorNames.SWAP_TO_DOT, (statement: string) => {
     let startBraceIdx = statement.indexOf("[")
     let lastIdx = 0
     while (startBraceIdx !== -1) {
@@ -42,7 +42,7 @@ export const processors = [
     return statement
   }),
 
-  new Preprocessor(PreprocessorNames.FIX_FUNCTIONS, statement => {
+  new Preprocessor(PreprocessorNames.FIX_FUNCTIONS, (statement: string) => {
     for (let specialCase of FUNCTION_CASES) {
       const toFind = `{ ${specialCase}`,
         replacement = `{${specialCase}`
@@ -51,29 +51,32 @@ export const processors = [
     return statement
   }),
 
-  new Preprocessor(PreprocessorNames.FINALISE, (statement, opts) => {
-    const noHelpers = opts && opts.noHelpers
-    let insideStatement = statement.slice(2, statement.length - 2)
-    if (insideStatement.charAt(0) === " ") {
-      insideStatement = insideStatement.slice(1)
-    }
-    if (insideStatement.charAt(insideStatement.length - 1) === " ") {
-      insideStatement = insideStatement.slice(0, insideStatement.length - 1)
-    }
-    const possibleHelper = insideStatement.split(" ")[0]
-    // function helpers can't be wrapped
-    for (let specialCase of FUNCTION_CASES) {
-      if (possibleHelper.includes(specialCase)) {
-        return statement
+  new Preprocessor(
+    PreprocessorNames.FINALISE,
+    (statement: string, opts: { noHelpers: any }) => {
+      const noHelpers = opts && opts.noHelpers
+      let insideStatement = statement.slice(2, statement.length - 2)
+      if (insideStatement.charAt(0) === " ") {
+        insideStatement = insideStatement.slice(1)
       }
+      if (insideStatement.charAt(insideStatement.length - 1) === " ") {
+        insideStatement = insideStatement.slice(0, insideStatement.length - 1)
+      }
+      const possibleHelper = insideStatement.split(" ")[0]
+      // function helpers can't be wrapped
+      for (let specialCase of FUNCTION_CASES) {
+        if (possibleHelper.includes(specialCase)) {
+          return statement
+        }
+      }
+      const testHelper = possibleHelper.trim().toLowerCase()
+      if (
+        !noHelpers &&
+        HelperNames().some(option => testHelper === option.toLowerCase())
+      ) {
+        insideStatement = `(${insideStatement})`
+      }
+      return `{{ all ${insideStatement} }}`
     }
-    const testHelper = possibleHelper.trim().toLowerCase()
-    if (
-      !noHelpers &&
-      HelperNames().some(option => testHelper === option.toLowerCase())
-    ) {
-      insideStatement = `(${insideStatement})`
-    }
-    return `{{ all ${insideStatement} }}`
-  }),
+  ),
 ]
diff --git a/packages/string-templates/src/types.ts b/packages/string-templates/src/types.ts
new file mode 100644
index 0000000000..fc029f3b6a
--- /dev/null
+++ b/packages/string-templates/src/types.ts
@@ -0,0 +1,7 @@
+export interface ProcessOptions {
+  cacheTemplates?: boolean
+  noEscaping?: boolean
+  noHelpers?: boolean
+  noFinalise?: boolean
+  escapeNewlines?: boolean
+}