feat: Add Issue Dependencies API support

github/issues_dependencies.go

@@ -0,0 +1,110 @@
+// Copyright 2026 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"context"
+	"fmt"
+)
+
+// IssueDependencyRequest represents a request to add a dependency to an issue.
+type IssueDependencyRequest struct {
+	IssueID *int64 `json:"issue_id,omitempty"`
+}
+
+// ListBlockedBy lists the dependencies that block the specified issue.
+//
+// GitHub API docs: https://docs.github.com/rest/issues/issue-dependencies#list-dependencies-an-issue-is-blocked-by
+//
+//meta:operation GET /repos/{owner}/{repo}/issues/{issue_number}/dependencies/blocked_by
+func (s *IssuesService) ListBlockedBy(ctx context.Context, owner, repo string, number int, opts *ListOptions) ([]*Issue, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/issues/%v/dependencies/blocked_by", owner, repo, number)
+	u, err := addOptions(u, opts)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var issues []*Issue
+	resp, err := s.client.Do(ctx, req, &issues)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return issues, resp, nil
+}
+
+// AddBlockedBy adds a "blocked by" dependency to the specified issue.
+//
+// GitHub API docs: https://docs.github.com/rest/issues/issue-dependencies#add-a-dependency-an-issue-is-blocked-by
+//
+//meta:operation POST /repos/{owner}/{repo}/issues/{issue_number}/dependencies/blocked_by
+func (s *IssuesService) AddBlockedBy(ctx context.Context, owner, repo string, number int, issueDepReq *IssueDependencyRequest) (*Issue, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/issues/%v/dependencies/blocked_by", owner, repo, number)
+	req, err := s.client.NewRequest("POST", u, issueDepReq)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var issue *Issue
+	resp, err := s.client.Do(ctx, req, &issue)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return issue, resp, nil
+}
+
+// RemoveBlockedBy removes a "blocked by" dependency from the specified issue.
+//
+// GitHub API docs: https://docs.github.com/rest/issues/issue-dependencies#remove-dependency-an-issue-is-blocked-by
+//
+//meta:operation DELETE /repos/{owner}/{repo}/issues/{issue_number}/dependencies/blocked_by/{issue_id}
+func (s *IssuesService) RemoveBlockedBy(ctx context.Context, owner, repo string, number int, issueID int64) (*Issue, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/issues/%v/dependencies/blocked_by/%v", owner, repo, number, issueID)
+	req, err := s.client.NewRequest("DELETE", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var issue *Issue
+	resp, err := s.client.Do(ctx, req, &issue)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return issue, resp, nil
+}
+
+// ListBlocking lists the issues that the specified issue is blocking.
+//
+// GitHub API docs: https://docs.github.com/rest/issues/issue-dependencies#list-dependencies-an-issue-is-blocking
+//
+//meta:operation GET /repos/{owner}/{repo}/issues/{issue_number}/dependencies/blocking
+func (s *IssuesService) ListBlocking(ctx context.Context, owner, repo string, number int, opts *ListOptions) ([]*Issue, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/issues/%v/dependencies/blocking", owner, repo, number)
+	u, err := addOptions(u, opts)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var issues []*Issue
+	resp, err := s.client.Do(ctx, req, &issues)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return issues, resp, nil
+}