feat: Typescript for API layer (#817)

Co-authored-by: Philip Korsholm <88927411+pKorsholm@users.noreply.github.com>
Co-authored-by: Zakaria El Asri <33696020+zakariaelas@users.noreply.github.com>
Co-authored-by: Kasper Fabricius Kristensen <45367945+kasperkristensen@users.noreply.github.com>
Co-authored-by: Philip Korsholm <philip.korsholm@hotmail.com>
Co-authored-by: Sebastian Rindom <seb@medusa-commerce.com>

packages/medusa-core-utils/.babelrc

@@ -1,6 +1,6 @@
 {
   "plugins": ["@babel/plugin-proposal-class-properties"],
-  "presets": ["@babel/preset-env"],
+  "presets": ["@babel/preset-env", "@babel/preset-typescript"],
   "env": {
     "test": {
       "plugins": ["@babel/plugin-transform-runtime"]

packages/medusa-core-utils/package.json

@@ -10,7 +10,7 @@
   },
   "scripts": {
     "test": "jest",
-    "build": "babel src --out-dir dist/ --ignore **/__tests__",
+    "build": "tsc --build",
     "prepare": "cross-env NODE_ENV=production npm run build",
     "watch": "babel -w src --out-dir dist/ --ignore **/__tests__"
   },
@@ -23,15 +23,19 @@
     "@babel/plugin-transform-classes": "^7.9.5",
     "@babel/plugin-transform-runtime": "^7.7.6",
     "@babel/preset-env": "^7.13.9",
+    "@babel/preset-typescript": "^7.16.0",
     "@babel/runtime": "^7.13.9",
+    "class-transformer": "^0.4.0",
+    "class-validator": "^0.13.1",
     "cross-env": "^5.2.1",
     "eslint": "^6.8.0",
     "jest": "^25.5.2",
-    "prettier": "^1.19.1"
+    "prettier": "^1.19.1",
+    "typescript": "^4.4.4"
   },
   "dependencies": {
     "joi": "^17.3.0",
     "joi-objectid": "^3.0.1"
   },
   "gitHead": "41a5425405aea5045a26def95c0dc00cf4a5a44d"
-}
+}

packages/medusa-core-utils/src/errors.ts

@@ -22,12 +22,21 @@ export const MedusaErrorCodes = {
  * @extends Error
  */
 class MedusaError extends Error {
+  public type: string
+  public message: string
+  public code?: string
+  public date: Date
+  public static Types = MedusaErrorTypes
+  public static Codes = MedusaErrorCodes
+
   /**
    * Creates a standardized error to be used across Medusa project.
-   * @param type {MedusaErrorType} - the type of error.
-   * @param params {Array} - Error params.
+   * @param {string} type - type of error
+   * @param {string} message - message to go along with error
+   * @param {string} code - code of error
+   * @param {Array} params - params
    */
-  constructor(type, message, code, ...params) {
+  constructor(type: string, message: string, code?: string, ...params: any) {
     super(...params)
 
     if (Error.captureStackTrace) {
@@ -35,14 +44,10 @@ class MedusaError extends Error {
     }
 
     this.type = type
-    this.name = type
     this.code = code
     this.message = message
     this.date = new Date()
   }
 }
 
-MedusaError.Types = MedusaErrorTypes
-MedusaError.Codes = MedusaErrorCodes
-
 export default MedusaError

packages/medusa-core-utils/src/index.js

@@ -1,11 +1,11 @@
-export { countries } from "./countries"
-export { isoCountryLookup } from "./countries"
-export { transformIdableFields } from "./transform-idable-fields"
-export { indexTypes } from "./index-types"
-export { default as Validator } from "./validator"
+export { default as compareObjectsByProp } from "./compare-objects"
+export { countries, isoCountryLookup } from "./countries"
+export { default as createRequireFromPath } from "./create-require-from-path"
 export { default as MedusaError } from "./errors"
 export { default as getConfigFile } from "./get-config-file"
-export { default as createRequireFromPath } from "./create-require-from-path"
-export { default as compareObjectsByProp } from "./compare-objects"
-export { default as zeroDecimalCurrencies } from "./zero-decimal-currencies"
 export { default as humanizeAmount } from "./humanize-amount"
+export { indexTypes } from "./index-types"
+export { transformIdableFields } from "./transform-idable-fields"
+export { default as Validator } from "./validator"
+export { default as zeroDecimalCurrencies } from "./zero-decimal-currencies"
+

packages/medusa-core-utils/tsconfig.json

@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "lib": ["es5", "es6"],
+    "target": "es5",
+    "outDir": "./dist",
+    "esModuleInterop": true,
+    "declaration": true,
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "sourceMap": true,
+    "noImplicitReturns": true,
+    "strictNullChecks": true,
+    "strictFunctionTypes": true,
+    "noImplicitThis": true,
+    "allowJs": true,
+    "skipLibCheck": true
+  },
+  "include": ["./src/**/*"],
+  "exclude": ["./dist/**/*", "./src/__tests__", "node_modules"]
+}