feat(medusa, types): Improve DX of model extensions (#4398)

packages/utils/src/common/__tests__/to-camel-case.spec.ts

@@ -0,0 +1,36 @@
+import { toCamelCase } from "../to-camel-case"
+
+describe("toCamelCase", function () {
+  it("should convert all cases to camel case", function () {
+    const expectations = [
+      {
+        input: "testing-camelize",
+        output: "testingCamelize",
+      },
+      {
+        input: "testing-Camelize",
+        output: "testingCamelize",
+      },
+      {
+        input: "TESTING-CAMELIZE",
+        output: "testingCamelize",
+      },
+      {
+        input: "this_is-A-test",
+        output: "thisIsATest",
+      },
+      {
+        input: "this_is-A-test ANOTHER",
+        output: "thisIsATestAnother",
+      },
+      {
+        input: "testingAlreadyCamelized",
+        output: "testingAlreadyCamelized",
+      },
+    ]
+
+    expectations.forEach((expectation) => {
+      expect(toCamelCase(expectation.input)).toEqual(expectation.output)
+    })
+  })
+})

packages/utils/src/common/__tests__/upper-case-first.spec.ts

@@ -0,0 +1,36 @@
+import { upperCaseFirst } from "../upper-case-first"
+
+describe("upperCaseFirst", function () {
+  it("should convert first letter of the word to capital letter", function () {
+    const expectations = [
+      {
+        input: "testing capitalize",
+        output: "Testing capitalize",
+      },
+      {
+        input: "testing",
+        output: "Testing",
+      },
+      {
+        input: "Testing",
+        output: "Testing",
+      },
+      {
+        input: "TESTING",
+        output: "TESTING",
+      },
+      {
+        input: "t",
+        output: "T",
+      },
+      {
+        input: "",
+        output: "",
+      },
+    ]
+
+    expectations.forEach((expectation) => {
+      expect(upperCaseFirst(expectation.input)).toEqual(expectation.output)
+    })
+  })
+})

packages/utils/src/common/index.ts

@@ -8,12 +8,14 @@ export * from "./is-email"
 export * from "./is-object"
 export * from "./is-string"
 export * from "./lower-case-first"
+export * from "./upper-case-first"
 export * from "./medusa-container"
 export * from "./object-to-string-path"
 export * from "./set-metadata"
 export * from "./simple-hash"
 export * from "./wrap-handler"
 export * from "./to-kebab-case"
+export * from "./to-camel-case"
 export * from "./stringify-circular"
 export * from "./build-query"
 export * from "./handle-postgres-database-error"

packages/utils/src/common/to-camel-case.ts

@@ -0,0 +1,7 @@
+export function toCamelCase(str: string): string {
+  return /^([a-z]+)(([A-Z]([a-z]+))+)$/.test(str)
+    ? str
+    : str
+        .toLowerCase()
+        .replace(/[^a-zA-Z0-9]+(.)/g, (m, chr) => chr.toUpperCase())
+}

packages/utils/src/common/upper-case-first.ts

@@ -0,0 +1,3 @@
+export function upperCaseFirst(str: string): string {
+  return str.charAt(0).toUpperCase() + str.slice(1)
+}