import settings from '../settings';

import { GithubSettings } from './settings';

import * as utils from './utils';

import { Octokit as GitHubApi, RestEndpointMethodTypes } from '@octokit/rest';

import { Endpoints } from '@octokit/types';

import {

GitLabDiscussion,

GitLabDiscussionNote,

GitlabHelper,

GitLabIssue,

GitLabMergeRequest,

GitLabNote,

GitLabUser,

} from './gitlabHelper';

type IssuesListForRepoResponseData =

Endpoints['GET /repos/{owner}/{repo}/issues']['response']['data'];

type PullsListResponseData =

Endpoints['GET /repos/{owner}/{repo}/pulls']['response']['data'];

type GitHubIssue = IssuesListForRepoResponseData[0];

type GitHubPullRequest = PullsListResponseData[0];

const gitHubLocation = 'https://github.com';

// Source for regex: https://stackoverflow.com/a/30281147

const usernameRegex = new RegExp('\\B@([a-z0-9](?:-(?=[a-z0-9])|[a-z0-9]){0,38}(?<=[a-z0-9]))', 'gi')

interface CommentImport {

created_at?: string;

body: string;

}

interface IssueImport {

title: string;

body: string;

closed: boolean;

assignee?: string;

created_at?: string;

updated_at?: string;

closed_at?: string;

milestone?: number;

labels?: string[];

}

export interface MilestoneImport {

id: number; // GitHub internal identifier

iid: number; // GitLab external number

title: string;

description: string;

state: string;

due_date?: string;

}

export interface SimpleLabel {

name: string;

color: string;

description: string;

}

export interface SimpleMilestone {

number: number;

title: string;

}

export class GithubHelper {

githubApi: GitHubApi;

githubUrl: string;

githubOwner: string;

githubOwnerIsOrg: boolean;

githubToken: string;

githubTokenOwner: string;

githubRepo: string;

githubTimeout?: number;

gitlabHelper: GitlabHelper;

repoId?: number;

delayInMs: number;

useIssuesForAllMergeRequests: boolean;

milestoneMap?: Map<number, SimpleMilestone>;

users: Set<string>;

members: Set<string>;

constructor(

githubApi: GitHubApi,

githubSettings: GithubSettings,

gitlabHelper: GitlabHelper,

useIssuesForAllMergeRequests: boolean

) {

this.githubApi = githubApi;

this.githubUrl = githubSettings.baseUrl

? githubSettings.baseUrl

: gitHubLocation;

this.githubOwner = githubSettings.owner;

this.githubOwnerIsOrg = githubSettings.ownerIsOrg ?? false;

this.githubToken = githubSettings.token;

this.githubTokenOwner = githubSettings.token_owner;

this.githubRepo = githubSettings.repo;

this.githubTimeout = githubSettings.timeout;

this.gitlabHelper = gitlabHelper;

this.delayInMs = 2000;

this.useIssuesForAllMergeRequests = useIssuesForAllMergeRequests;

this.users = new Set<string>();

this.members = new Set<string>();

// TODO: won't work if ownerIsOrg is false

githubApi.orgs.listMembers( {

org: this.githubOwner,

}).then(members => {

for (let member of members.data) {

this.members.add(member.login);

}

}).catch(err => {

console.error(`Failed to fetch organization members: ${err}`);

});

}

/*

******************************************************************************

******************************** GET METHODS *********************************

******************************************************************************

*/

/**

* Store the new repo id

*/

async registerRepoId() {

try {

await utils.sleep(this.delayInMs);

let result = await this.githubApi.repos.get({

owner: this.githubOwner,

repo: this.githubRepo,

});

this.repoId = result.data.id;

} catch (err) {

console.error('Could not access GitHub repo');

console.error(err);

process.exit(1);

}

}

// ----------------------------------------------------------------------------

/**

* Get a list of all GitHub milestones currently in new repo

*/

async getAllGithubMilestones(): Promise<SimpleMilestone[]> {

try {

await utils.sleep(this.delayInMs);

// get an array of GitHub milestones for the new repo

let result = await this.githubApi.issues.listMilestones({

owner: this.githubOwner,

repo: this.githubRepo,

state: 'all',

});

return result.data.map(x => ({ number: x.number, title: x.title }));

} catch (err) {

console.error('Could not access all GitHub milestones');

console.error(err);

process.exit(1);

}

}

// ----------------------------------------------------------------------------

/**

* Get a list of all the current GitHub issues.

* This uses a while loop to make sure that each page of issues is received.

*/

async getAllGithubIssues() {

let allIssues: IssuesListForRepoResponseData = [];

let page = 1;

const perPage = 100;

while (true) {

await utils.sleep(this.delayInMs);

// get a paginated list of issues

const issues = await this.githubApi.issues.listForRepo({

owner: this.githubOwner,

repo: this.githubRepo,

state: 'all',

// Remove label filter to get ALL issues for proper duplicate detection

// labels: 'gitlab merge request',

per_page: perPage,

page: page,

});

// if this page has zero issues then we are done!

if (issues.data.length === 0) break;

// join this list of issues with the master list

allIssues = allIssues.concat(issues.data);

// if there are strictly less issues on this page than the maximum number per page

// then we can be sure that this is all the issues. No use querying again.

if (issues.data.length < perPage) break;

// query for the next page of issues next iteration

page++;

}

return allIssues;

}

// ----------------------------------------------------------------------------

/**

* Get a list of all GitHub label names currently in new repo

*/

async getAllGithubLabelNames() {

try {

await utils.sleep(this.delayInMs);

// get an array of GitHub labels for the new repo

let result = await this.githubApi.issues.listLabelsForRepo({

owner: this.githubOwner,

repo: this.githubRepo,

});

// extract the label name and put into a new array

let labels = result.data.map(x => x.name);

return labels;

} catch (err) {

console.error('Could not access all GitHub label names');

console.error(err);

process.exit(1);

}

}

// ----------------------------------------------------------------------------

/**

* Gets a release by tag name

* @param tag {string} - the tag name to search a release for

* @returns

*/

async getReleaseByTag(tag: string) {

try {

await utils.sleep(this.delayInMs);

// get an existing release by tag name in github

let result = await this.githubApi.repos.getReleaseByTag({

owner: this.githubOwner,

repo: this.githubRepo,

tag: tag,

});

return result;

} catch (err) {

console.error('No existing release for this tag on github');

return null;

}

}

// ----------------------------------------------------------------------------

/**

* Creates a new release on github

* @param tag_name {string} - the tag name

* @param name {string} - title of the release

* @param body {string} - description for the release

*/

async createRelease(tag_name: string, name: string, body: string) {

try {

await utils.sleep(this.delayInMs);

// get an array of GitHub labels for the new repo

let result = await this.githubApi.repos.createRelease({

owner: this.githubOwner,

repo: this.githubRepo,

tag_name,

name,

body,

});

return result;

} catch (err) {

console.error('Could not create release on github');

console.error(err);

return null;

}

}

// ----------------------------------------------------------------------------

/**

* Get a list of all the current GitHub pull requests.

* This uses a while loop to make sure that each page of issues is received.

*/

async getAllGithubPullRequests() {

let allPullRequests: PullsListResponseData = [];

let page = 1;

const perPage = 100;

while (true) {

await utils.sleep(this.delayInMs);

// get a paginated list of pull requests

const pullRequests = await this.githubApi.pulls.list({

owner: this.githubOwner,

repo: this.githubRepo,

state: 'all',

per_page: perPage,

page: page,

});

// if this page has zero PRs then we are done!

if (pullRequests.data.length === 0) break;

// join this list of PRs with the master list

allPullRequests = allPullRequests.concat(pullRequests.data);

// if there are strictly less PRs on this page than the maximum number per page

// then we can be sure that this is all the PRs. No use querying again.

if (pullRequests.data.length < perPage) break;

// query for the next page of PRs next iteration

page++;

}

return allPullRequests;

}

// ----------------------------------------------------------------------------

/*

******************************************************************************

******************************** POST METHODS ********************************

******************************************************************************

*/

userIsCreator(author: GitLabUser) {

this.users.add(author.username as string);

return (

author &&

((settings.usermap &&

settings.usermap[author.username as string] ===

settings.github.token_owner) ||

author.username === settings.github.token_owner)

);

}

/**

* Update the description of the repository on GitHub.

* Replaces newlines and tabs with spaces. No attempt is made to remove e.g. Markdown

* links or other special formatting.

*/

async updateRepositoryDescription(description: string) {

let props: RestEndpointMethodTypes['repos']['update']['parameters'] = {

owner: this.githubOwner,

repo: this.githubRepo,

description: description?.replace(/\s+/g, ' ') || '',

};

return this.githubApi.repos.update(props);

}

/**

* TODO description

* @param milestones All GitHub milestones

* @param issue The GitLab issue object

*/

async createIssue(issue: GitLabIssue) {

let bodyConverted = await this.convertIssuesAndComments(

issue.description ?? '',

issue,

!this.userIsCreator(issue.author) || !issue.description,

true,

true,

);

let props: RestEndpointMethodTypes['issues']['create']['parameters'] = {

owner: this.githubOwner,

repo: this.githubRepo,

title: issue.title ? issue.title.trim() : '',

body: bodyConverted,

};

props.assignees = this.convertAssignees(issue);

props.milestone = this.convertMilestone(issue);

props.labels = this.convertLabels(issue);

await utils.sleep(this.delayInMs);

if (settings.dryRun) return Promise.resolve({ data: issue });

return this.githubApi.issues.create(props);

}

/**

* Converts GitLab assignees to GitHub usernames, using settings.usermap

*/

convertAssignees(item: GitLabIssue | GitLabMergeRequest): string[] {

if (!item.assignees) return [];

let assignees: string[] = [];

for (let assignee of item.assignees) {

let username: string = assignee.username as string;

this.users.add(username);

if (username === settings.github.username) {

assignees.push(settings.github.username);

} else if (settings.usermap && settings.usermap[username]) {

let gitHubUsername = settings.usermap[username];

if (this.members.has(gitHubUsername)) {

assignees.push(gitHubUsername);

}

else {

console.log(`Cannot assign assignee: User ${gitHubUsername} is not a member of ${this.githubOwner}`);

}

}

}

return assignees;

}

/**

* Returns the GitHub milestone id for a milestone GitLab property of an issue or MR

*

* Note that this requires milestoneMap to be built, either during migration

* or read from GitHub using registerMilestoneMap()

*/

convertMilestone(item: GitLabIssue | GitLabMergeRequest): number | undefined {

if (!this.milestoneMap) throw Error('this.milestoneMap not initialised');

if (!item.milestone) return undefined;

for (let m of this.milestoneMap.values())

if (m.title == item.milestone.title) return m.number;

return undefined;

}

/**

* Converts GitLab labels to GitHub labels.

*

* This also adds "has attachment" if the issue links to data.

*/

convertLabels(item: GitLabIssue | GitLabMergeRequest): string[] {

let labels: string[] = [];

if (item.labels) {

labels = item.labels.filter(l => {

if (item.state !== 'closed') return true;

let lower = l.toLowerCase();

// ignore any labels that should have been removed when the issue was closed

return lower !== 'doing' && lower !== 'to do';

});

if (settings.conversion.useLowerCaseLabels) {

labels = labels.map((el: string) => el.toLowerCase());

}

}

// If the item's description contains a url that contains "/uploads/",

// it is likely to have an attachment

if (

item.description &&

item.description.indexOf('/uploads/') > -1 &&

!settings.s3

) {

labels.push('has attachment');

}

// Differentiate between issue and merge request

// Note that it needs to apply to placeholders as well

if ('merge_requests_count' in item) {

labels.push('gitlab issue');

} else {

labels.push('gitlab merge request');

}

if (item.state === 'merged') {

labels.push('merged');

}

return labels;

}

/**

* Uses the preview issue import API to set creation date on issues and comments.

* Also it does not notify assignees.

*

* See https://gist.github.com/jonmagic/5282384165e0f86ef105

* @param milestones All GitHub milestones

* @param issue The GitLab issue object

*/

async importIssueAndComments(issue: GitLabIssue) {

let bodyConverted = issue.isPlaceholder

? issue.description ?? ''

: await this.convertIssuesAndComments(

issue.description ?? '',

issue,

!this.userIsCreator(issue.author) || !issue.description,

true,

true,

);

let props: IssueImport = {

title: issue.title ? issue.title.trim() : '',

body: bodyConverted,

created_at: issue.created_at,

updated_at: issue.updated_at,

closed: issue.state === 'closed',

};

if (issue.state === 'closed' && issue.closed_at) {

props.closed_at = issue.closed_at;

}

let assignees = this.convertAssignees(issue);

props.assignee = assignees.length == 1 ? assignees[0] : undefined;

props.milestone = this.convertMilestone(issue);

props.labels = this.convertLabels(issue);

if (settings.dryRun) return Promise.resolve({ data: issue });

//

// Issue comments

//

console.log('\tMigrating issue comments...');

let comments: CommentImport[] = [];

if (issue.isPlaceholder) {

console.log(

'\t...this is a placeholder issue, no comments are migrated.'

);

} else {

let notes = await this.gitlabHelper.getIssueNotes(issue.iid);

comments = await this.processNotesIntoComments(notes);

}

const issue_number = await this.requestImportIssue(props, comments);

if (assignees.length > 1 && issue_number) {

if (assignees.length > 10) {

console.error(

`Cannot add more than 10 assignees to GitHub issue #${issue_number}.`

);

} else {

console.log(

`Importing ${assignees.length} assignees for GitHub issue #${issue_number}`

);

}

this.githubApi.issues.addAssignees({

owner: this.githubOwner,

repo: this.githubRepo,

issue_number: issue_number,

assignees: assignees,

});

}

}

/**

*

* @param notes

* @returns Comments ready for requestImportIssue()

*/

async processNotesIntoComments(

notes: GitLabNote[]

): Promise<CommentImport[]> {

if (!notes || !notes.length) {

console.log(`\t...no comments available, nothing to migrate.`);

return [];

}

let comments: CommentImport[] = [];

// sort notes in ascending order of when they were created (by id)

notes = notes.sort((a, b) => a.id - b.id);

let nrOfMigratedNotes = 0;

for (let note of notes) {

if (this.checkIfNoteCanBeSkipped(note.body)) continue;

this.users.add(note.author.username);

let userIsPoster =

(settings.usermap &&

settings.usermap[note.author.username] ===

settings.github.token_owner) ||

note.author.username === settings.github.token_owner;

comments.push({

created_at: note.created_at,

body: await this.convertIssuesAndComments(

note.body,

note,

!userIsPoster || !note.body

),

});

nrOfMigratedNotes++;

}

console.log(

`\t...Done creating comments (migrated ${nrOfMigratedNotes} comments, skipped ${

notes.length - nrOfMigratedNotes

} comments)`

);

return comments;

}

/**

*

* @param discussions

* @returns Comments ready for requestImportIssue()

*/

async processDiscussionsIntoComments(

discussions: GitLabDiscussion[]

): Promise<CommentImport[]> {

if (!discussions || !discussions.length) {

console.log(`\t...no comments available, nothing to migrate.`);

return [];

}

let comments: CommentImport[] = [];

// sort notes in ascending order of when they were created (by id)

discussions = discussions.sort((a, b) => Number.parseInt(a.id) - Number.parseInt(b.id));

let nrOfMigratedNotes = 0;

let nrOfSkippedNotes = 0;

for (let discussion of discussions) {

let discussionComments = [];

for (let note of discussion.notes) {

if (this.checkIfNoteCanBeSkipped(note.body)) {

nrOfSkippedNotes++;

continue;

}

let username = note.author.username as string;

this.users.add(username);

let userIsPoster =

(settings.usermap &&

settings.usermap[username] ===

settings.github.token_owner) ||

username === settings.github.token_owner;

// only add line ref for first note of discussion

const add_line_ref = discussion.notes.indexOf(note) === 0;

discussionComments.push({

created_at: note.created_at,

body: await this.convertIssuesAndComments(

note.body,

note,

!userIsPoster || !note.body,

add_line_ref,

),

});

nrOfMigratedNotes++;

}

// Combine notes for discussion into one comment

if (discussionComments.length == 1) {

comments.push(discussionComments[0]);

}

else if (discussionComments.length > 1) {

let combinedBody = '**Discussion in GitLab:**\n\n';

let first_created_at = discussionComments[0].created_at;

combinedBody += discussionComments.map(comment => comment.body).join('\n\n');

comments.push({

created_at: first_created_at,

body: combinedBody,

});

}

}

console.log(

`\t...Done creating discussion comments (migrated ${nrOfMigratedNotes} comments, skipped ${

nrOfSkippedNotes

} comments)`

);

return comments;

}

/**

* Calls the preview API for issue importing

*

* @param issue Props for the issue

* @param comments Comments

* @returns GitHub issue number or null if import failed

*/

async requestImportIssue(

issue: IssueImport,

comments: CommentImport[]

): Promise<number | null> {

// see: https://github.com/orgs/community/discussions/27190

if (issue.body.length > 65536) {

throw `${issue.title} has a body longer than 65536 characters. Please shorten it.`;

}

// create the GitHub issue from the GitLab issue

let pending = await this.githubApi.request(

`POST /repos/${settings.github.owner}/${settings.github.repo}/import/issues`,

{

issue: issue,

comments: comments,

}

);

let result = null;

while (true) {

await utils.sleep(this.delayInMs);

result = await this.githubApi.request(

`GET /repos/${settings.github.owner}/${settings.github.repo}/import/issues/${pending.data.id}`

);

if (

result.data.status === 'imported' ||

result.data.status === 'failed'

) {

break;

}

}

if (result.data.status === 'failed') {

console.log('\tFAILED: ');

console.log(result);

console.log('\tERRORS:');

console.log(result.data.errors);

return null;

}

let issue_number = result.data.issue_url.split('/').splice(-1)[0];

return issue_number;

}

// ----------------------------------------------------------------------------

/**

* TODO description

*/

async createIssueComments(githubIssue: GitHubIssue, issue: GitLabIssue) {

console.log('\tMigrating issue comments...');

// retrieve any notes/comments associated with this issue

if (issue.isPlaceholder) {

console.log(

'\t...this is a placeholder issue, no comments are migrated.'

);

return;

}

let notes = await this.gitlabHelper.getIssueNotes(issue.iid);

// if there are no notes, then there is nothing to do!

if (notes.length === 0) {

console.log(`\t...no issue comments available, nothing to migrate.`);

return;

}

// sort notes in ascending order of when they were created (by id)

notes = notes.sort((a, b) => a.id - b.id);

let nrOfMigratedNotes = 0;

for (let note of notes) {

const gotMigrated = await this.processNote(note, githubIssue);

if (gotMigrated) nrOfMigratedNotes++;

}

console.log(

`\t...Done creating issue comments (migrated ${nrOfMigratedNotes} comments, skipped ${

notes.length - nrOfMigratedNotes

} comments)`

);

}

// ----------------------------------------------------------------------------

/**

* This function checks if a note needs to be processed or if it can be skipped.

* A note can be skipped if it contains predefined terms (like 'Status changed to...')

* or if it contains any value from settings.skipMatchingComments ->

* Note that this is case insensitive!

*

*/

checkIfNoteCanBeSkipped(noteBody: string) {

const stateChange =

(/Status changed to .*/i.test(noteBody) &&

!/Status changed to closed by commit.*/i.test(noteBody)) ||

/^changed milestone to .*/i.test(noteBody) ||

/^Milestone changed to .*/i.test(noteBody) ||

/^(Re)*assigned to /i.test(noteBody) ||

/^added .* labels/i.test(noteBody) ||

/^Added ~.* label/i.test(noteBody) ||

/^removed ~.* label/i.test(noteBody) ||

/^mentioned in issue #\d+.*/i.test(noteBody) ||

// /^marked this issue as related to #\d+/i.test(noteBody) ||

/^mentioned in merge request !\d+/i.test(noteBody) ||

/^changed the description.*/i.test(noteBody) ||

/^changed title from.*to.*/i.test(noteBody);

const matchingComment = settings.skipMatchingComments.reduce(

(a, b) => a || new RegExp(b, 'i').test(noteBody),

false

);

return stateChange || matchingComment;

}

// ----------------------------------------------------------------------------

/*

* Processes the current note.

* This means, it either creates a comment in the github issue, or it gets skipped.

* Return false when it got skipped, otherwise true.

*/

async processNote(

note: GitLabNote | GitLabDiscussionNote,

githubIssue: Pick<GitHubIssue | GitHubPullRequest, 'number'>

) {

if (this.checkIfNoteCanBeSkipped(note.body)) return false;

let bodyConverted = await this.convertIssuesAndComments(note.body, note);

await utils.sleep(this.delayInMs);

if (settings.dryRun) return true;

await this.githubApi.issues

.createComment({

owner: this.githubOwner,

repo: this.githubRepo,

issue_number: githubIssue.number,

body: bodyConverted,

})

.catch(x => {

console.error('could not create GitHub issue comment!');

console.error(x);

process.exit(1);

});

return true;

}

// ----------------------------------------------------------------------------

/**

* Update the issue state (i.e., closed or open).

*/

async updateIssueState(githubIssue: GitHubIssue, issue: GitLabIssue) {

// default state is open so we don't have to update if the issue is closed.

if (issue.state !== 'closed' || githubIssue.state === 'closed') return;

let props: RestEndpointMethodTypes['issues']['update']['parameters'] = {

owner: this.githubOwner,

repo: this.githubRepo,

issue_number: githubIssue.number,

state: issue.state,

};

await utils.sleep(this.delayInMs);

if (settings.dryRun) return Promise.resolve();

return await this.githubApi.issues.update(props);

}

// ----------------------------------------------------------------------------

/**

* Create a GitHub milestone from a GitLab milestone

* @param milestone GitLab milestone data

* @return Created milestone data (or void if debugging => nothing created)

*/

async createMilestone(milestone: MilestoneImport): Promise<SimpleMilestone> {

// convert from GitLab to GitHub

let bodyConverted = await this.convertIssuesAndComments(

milestone.description,

milestone,

false

);

let githubMilestone: RestEndpointMethodTypes['issues']['createMilestone']['parameters'] =

{

owner: this.githubOwner,

repo: this.githubRepo,

title: milestone.title,

description: bodyConverted,

state: milestone.state === 'active' ? 'open' : 'closed',

};

if (milestone.due_date) {

githubMilestone.due_on = milestone.due_date + 'T00:00:00Z';

}

await utils.sleep(this.delayInMs);

if (settings.dryRun) return Promise.resolve({ number: -1, title: 'DEBUG' });

const created = await this.githubApi.issues.createMilestone(

githubMilestone

);

return { number: created.data.number, title: created.data.title };

}

// ----------------------------------------------------------------------------

/**

* Create a GitHub label from a GitLab label

*/

async createLabel(label: SimpleLabel) {

// convert from GitLab to GitHub

let githubLabel = {

owner: this.githubOwner,

repo: this.githubRepo,

name: label.name,

color: label.color.substring(1), // remove leading "#" because gitlab returns it but github wants the color without it

description: label.description,

};

await utils.sleep(this.delayInMs);

if (settings.dryRun) return Promise.resolve();

// create the GitHub label

return await this.githubApi.issues.createLabel(githubLabel);

}

// ----------------------------------------------------------------------------

/**

* Create a pull request, set its data, and set its comments

* @param mergeRequest the GitLab merge request that we want to migrate

*/

async createPullRequestAndComments(

mergeRequest: GitLabMergeRequest

): Promise<void> {

let pullRequestData = await this.createPullRequest(mergeRequest);

// createPullRequest() returns an issue number if a PR could not be created and

// an issue was created instead, and settings.useIssueImportAPI is true. In that

// case comments were already added and the state is already properly set

if (typeof pullRequestData === 'number' || !pullRequestData) return;

let pullRequest = pullRequestData.data;

// data is set to null if one of the branches does not exist and the pull request cannot be created

if (pullRequest) {

// Add milestones, labels, and other attributes from the Issues API

await this.updatePullRequestData(pullRequest, mergeRequest);

// add any comments/nodes associated with this pull request

await this.createPullRequestComments(pullRequest, mergeRequest);

// Make sure to close the GitHub pull request if it is closed or merged in GitLab

await this.updatePullRequestState(pullRequest, mergeRequest);

}

}

// ----------------------------------------------------------------------------

/**

* Create a pull request. A pull request can only be created if both the target and source branches exist on the GitHub

* repository. In many cases, the source branch is deleted when the merge occurs, and the merge request may not be able

* to be migrated. In this case, an issue is created instead with a 'gitlab merge request' label.

* @param mergeRequest the GitLab merge request object that we want to duplicate

* @returns {Promise<Promise<{data: null}>|Promise<Github.Response<Github.PullsCreateResponse>>|Promise<{data: *}>>}

*/

async createPullRequest(mergeRequest: GitLabMergeRequest) {

let canCreate = !this.useIssuesForAllMergeRequests;

if (canCreate) {

// Check to see if the target branch exists in GitHub - if it does not exist, we cannot create a pull request

try {

await this.githubApi.repos.getBranch({

owner: this.githubOwner,

repo: this.githubRepo,

branch: mergeRequest.target_branch,

});

} catch (err) {

let gitlabBranches = await this.gitlabHelper.getAllBranches();

if (gitlabBranches.find(m => m.name === mergeRequest.target_branch)) {

// Need to move that branch over to GitHub!

console.error(

`The '${mergeRequest.target_branch}' branch exists on GitLab but has not been migrated to GitHub. Please migrate the branch before migrating pull request #${mergeRequest.iid}.`

);

return Promise.resolve({ data: null });

} else {

console.error(

`Merge request ${mergeRequest.iid} (target branch '${mergeRequest.target_branch}' does not exist => cannot migrate pull request, creating an issue instead.`

);

canCreate = false;

}

}

}

if (canCreate) {

// Check to see if the source branch exists in GitHub - if it does not exist, we cannot create a pull request

try {

await this.githubApi.repos.getBranch({

owner: this.githubOwner,

repo: this.githubRepo,

branch: mergeRequest.source_branch,

});

} catch (err) {

let gitlabBranches = await this.gitlabHelper.getAllBranches();

if (gitlabBranches.find(m => m.name === mergeRequest.source_branch)) {

// Need to move that branch over to GitHub!

console.error(

`The '${mergeRequest.source_branch}' branch exists on GitLab but has not been migrated to GitHub. Please migrate the branch before migrating pull request #${mergeRequest.iid}.`

);

return Promise.resolve({ data: null });

} else {