File encoding pre-commit hook. Just clone this Gist next to all your other repos and run Copy-ToPeerRepos.ps1

Copy-ToPeerRepos.ps1

<#
.SYNOPSIS
    Clone this repo alongside all your other code repos. Then run this script.
    It will automatically copy the pre-commit hook scripts to your other repos.
#>
[CmdletBinding()]
param()

$ErrorActionPreference = "Stop"
Set-StrictMode -Version 5.0

$thisDir = Split-Path $MyInvocation.MyCommand.Path -Parent
$repoDir = Split-Path $thisDir

$filesToCopy = "pre-commit", "pre-commit.ps1" `
    | ForEach-Object { Join-Path $thisDir $_ }

Get-ChildItem $repoDir | ForEach-Object { Join-Path $_.FullName ".git\hooks" } `
    | Where-Object { Test-Path $_ } `
    | ForEach-Object {
        $destDir = $_
        Write-Verbose "$destDir..."
        $filesToCopy | ForEach-Object { Copy-Item $_ $destDir }
    }

pre-commit

#!/bin/sh

exec c:/Windows/System32/WindowsPowerShell/v1.0/powershell.exe -ExecutionPolicy RemoteSigned -NoProfile -Command '.git\hooks\pre-commit.ps1'

pre-commit.ps1

$ErrorActionPreference = "Stop"
Set-StrictMode -Version 5.0

$textExtensions = ".txt", ".md",
    ".ps1", ".psm1",
    ".cpp", ".h",
    ".cs", ".xaml",
    ".html", ".cshtml", ".ts", ".tsx", ".js", ".jsx",
    ".sln", ".csproj",
    ".xml", ".config", ".json"

$filesToCheck = git diff --cached --name-only --diff-filter=ACM `
    | ForEach-Object { Get-Item $_ } `
    | Where-Object { $textExtensions -contains $_.Extension }

if (!$filesToCheck) {
    return
}

function Get-FileEncoding([string]$path) {
    $path = (Resolve-Path $path).ProviderPath
    $reader = [IO.StreamReader]::new($path)
    try {
        # Reading a single character from the file will cause the StreamReader
        # to do encoding detection
        $reader.Read() | Out-Null
        $reader.CurrentEncoding.WebName
    } finally {
        $reader.Close()
        $reader.Dispose()
    }
}

$wrongEncoding = $filesToCheck | Where-Object {
    (Get-FileEncoding $_.FullName) -ne "utf-8"
}

if ($wrongEncoding) {
    $fileNames = $wrongEncoding | ForEach-Object { $_.Name }
    Write-Error "These files are not using the UTF8 encoding: $fileNames"
}

Thanks!