Get a dependency Graph from blocking Jira Issues for all issues in epic

plot-blocking-issues.ps1

#=== Step 1: Download and Install (or just extract) GraphViz
#=== Step 2: Execute the following statements if you run this for the 1st time:
# Set-ExecutionPolicy -ExecutionPolicy Unrestricted -Scope CurrentUser
# Install-Module PSGraph -Scope CurrentUser -Force
# Install-Module JiraPS -Scope CurrentUser -Force
# Set-JiraConfigServer "https://jira.contoso.com"
#=== Step 3: Set the following variable to your GraphViz binary path:
$graphVizPath = "C:\path\to\your\folder\dot.exe"
#=== Step 4: Run this script by typing its path in PowerShell.
$enriched = @()
$epicKey = Read-Host -Prompt "Please type in your Epic key (PROJ-1234)"
if (-not (Get-JiraSession)) {New-JiraSession}
Get-JiraIssue -JQL "`"Epic Link`" = $epicKey" | ForEach-Object {
    $key = $_.Key; 
    $links = $_.IssueLinks
    $linksList = New-Object System.Collections.ArrayList
    foreach ($link in $links) {
        $linksList.Add((New-Object psobject -Property @{name = $link.Type.OutwardText; key = $link.OutwardIssue.Key})) | Out-Null
    }
    $enriched += New-Object psobject -property @{issue = $key; links = $linksList}
}

graph g {
    node -default @{shape = 'rectangle'}
    foreach ($node in $enriched | Where-Object {$_.links}) {
        foreach ($link in $node.links) {
            if ($link.name -eq "Blocks") {
                edge $node.issue -to $link.key @{label = $link.name}
            }
        }
    }
} | Export-PSGraph -ShowGraph -GraphVizPath $graphVizPath