github.com/stoewer/go-strcase v1.2.0: convert strings between snake, camel, and kebab casing with go-strcase

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: convert strings between snake, camel, and kebab casing with go-strcase
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/stoewer/go-strcase@v1.2.0
Demonstrate these symbols/APIs:
  - KebabCase
  - LowerCamelCase
  - SnakeCase
  - UpperCamelCase
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:eafb7426878413b0ce2b5761b6405323b9ca74454ce8c81c9cd92e5342edc873","contract":["strcase.SnakeCase converts camelCase and kebab-case strings to lower snake_case","strcase.LowerCamelCase converts snake_case and kebab-case strings to lowerCamelCase","strcase.UpperCamelCase converts snake_case and kebab-case strings to UpperCamelCase","strcase.KebabCase converts camelCase and snake_case strings to lower kebab-case"],"goal":"convert strings between snake, camel, and kebab casing with go-strcase","kind":"HOW","packages":["pkg:golang/github.com/stoewer/go-strcase@v1.2.0"],"schemaVersion":1,"symbols":["KebabCase","LowerCamelCase","SnakeCase","UpperCamelCase"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/stoewer/go-strcase@v1.2.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/stoewer/go-strcase@v1.2.0","symbols":["KebabCase","LowerCamelCase","SnakeCase","UpperCamelCase"],"verifierAdapter":"golang@1"}

module sample-go-strcase

go 1.22

require github.com/stoewer/go-strcase v1.2.0

github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stoewer/go-strcase v1.2.0 h1:Z2iHWqGXH00XYgqDmNgQbIBxf3wrNq0F3feEy0ainaU=
github.com/stoewer/go-strcase v1.2.0/go.mod h1:IBiWB2sKIp3wVVQ3Y035++gc+knqhUQag1KpM8ahLw8=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

package main

import (
	"fmt"

	"github.com/stoewer/go-strcase"
)

func main() {
	input := "helloWorldExample"

	snake := strcase.SnakeCase(input)
	lowerCamel := strcase.LowerCamelCase(snake)
	upperCamel := strcase.UpperCamelCase(snake)
	kebab := strcase.KebabCase(input)

	fmt.Printf("Input: %s\n", input)
	fmt.Printf("SnakeCase: %s\n", snake)
	fmt.Printf("LowerCamelCase: %s\n", lowerCamel)
	fmt.Printf("UpperCamelCase: %s\n", upperCamel)
	fmt.Printf("KebabCase: %s\n", kebab)
}

{
  "schemaVersion": 1,
  "goal": "convert strings between snake, camel, and kebab casing with go-strcase",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/stoewer/go-strcase@v1.2.0"
  ],
  "symbols": [
    "KebabCase",
    "LowerCamelCase",
    "SnakeCase",
    "UpperCamelCase"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package main

import (
	"fmt"
	"os"

	"github.com/stoewer/go-strcase"
)

func main() {
	// Assertion 1: strcase.SnakeCase converts camelCase and kebab-case strings to lower snake_case
	{
		if got := strcase.SnakeCase("helloWorldExample"); got != "hello_world_example" {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: SnakeCase(helloWorldExample) = %q, want %q\n", got, "hello_world_example")
			os.Exit(1)
		}
		if got := strcase.SnakeCase("hello-world-example"); got != "hello_world_example" {
			fmt.Fprintf(os.Stderr, "Assertion 1 failed: SnakeCase(hello-world-example) = %q, want %q\n", got, "hello_world_example")
			os.Exit(1)
		}
	}

	// Assertion 2: strcase.LowerCamelCase converts snake_case and kebab-case strings to lowerCamelCase
	{
		if got := strcase.LowerCamelCase("hello_world_example"); got != "helloWorldExample" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: LowerCamelCase(hello_world_example) = %q, want %q\n", got, "helloWorldExample")
			os.Exit(1)
		}
		if got := strcase.LowerCamelCase("hello-world-example"); got != "helloWorldExample" {
			fmt.Fprintf(os.Stderr, "Assertion 2 failed: LowerCamelCase(hello-world-example) = %q, want %q\n", got, "helloWorldExample")
			os.Exit(1)
		}
	}

	// Assertion 3: strcase.UpperCamelCase converts snake_case and kebab-case strings to UpperCamelCase
	{
		if got := strcase.UpperCamelCase("hello_world_example"); got != "HelloWorldExample" {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: UpperCamelCase(hello_world_example) = %q, want %q\n", got, "HelloWorldExample")
			os.Exit(1)
		}
		if got := strcase.UpperCamelCase("hello-world-example"); got != "HelloWorldExample" {
			fmt.Fprintf(os.Stderr, "Assertion 3 failed: UpperCamelCase(hello-world-example) = %q, want %q\n", got, "HelloWorldExample")
			os.Exit(1)
		}
	}

	// Assertion 4: strcase.KebabCase converts camelCase and snake_case strings to lower kebab-case
	{
		if got := strcase.KebabCase("helloWorldExample"); got != "hello-world-example" {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: KebabCase(helloWorldExample) = %q, want %q\n", got, "hello-world-example")
			os.Exit(1)
		}
		if got := strcase.KebabCase("hello_world_example"); got != "hello-world-example" {
			fmt.Fprintf(os.Stderr, "Assertion 4 failed: KebabCase(hello_world_example) = %q, want %q\n", got, "hello-world-example")
			os.Exit(1)
		}
	}

	fmt.Println("All contract assertions passed.")
}