Add camelToSnakeCase

Author: schaable

v-next/hardhat-utils/src/string.ts

@@ -40,3 +40,13 @@ export function capitalize(str: string): string {
 export function kebabToCamelCase(str: string): string {
   return str.replace(/-./g, (match) => match.charAt(1).toUpperCase());
 }
+
+/**
+ * Converts a camelCase string to snake_case.
+ *
+ * @param str The camelCase string to convert.
+ * @returns The snake_case string.
+ */
+export function camelToSnakeCase(str: string): string {
+  return str.replace(/[A-Z]/g, (match) => `_${match.toLowerCase()}`);
+}

v-next/hardhat-utils/test/string.ts

@@ -1,7 +1,12 @@
 import assert from "node:assert/strict";
 import { describe, it } from "node:test";
 
-import { pluralize, capitalize, kebabToCamelCase } from "../src/string.js";
+import {
+  pluralize,
+  capitalize,
+  kebabToCamelCase,
+  camelToSnakeCase,
+} from "../src/string.js";
 
 describe("string", () => {
   describe("pluralize", () => {
@@ -44,4 +49,15 @@ describe("string", () => {
       );
     });
   });
+
+  describe("camelToSnakeCase", () => {
+    it("Should convert a camelCase string to snake_case", () => {
+      assert.equal(camelToSnakeCase("camelcasestring"), "camelcasestring");
+      assert.equal(camelToSnakeCase("camelCaseString"), "camel_case_string");
+      assert.equal(
+        camelToSnakeCase("camelCASESTRING"),
+        "camel_c_a_s_e_s_t_r_i_n_g",
+      );
+    });
+  });
 });