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import { getOctokit } from '@actions/github'

main()

async function main() {

const [org, repo] = process.env.GITHUB_REPOSITORY?.split('/') || []

if (!org || !repo) {

throw new Error('GITHUB_REPOSITORY environment variable not set')

}

const prNumber = process.env.AUTOMERGE_PR_NUMBER

if (!prNumber) {

throw new Error(`AUTOMERGE_PR_NUMBER environment variable not set`)

}

const token = process.env.GITHUB_TOKEN

if (!token) {

throw new Error(`GITHUB_TOKEN environment variable not set`)

}

const github = getOctokit(token)

const pull = await github.rest.pulls.get({

owner: org,

repo,

pull_number: parseInt(prNumber),

})

const pullNodeId = pull.data.node_id

console.log(`Pull request GraphQL Node ID: ${pullNodeId}`)

const mutation = `mutation ($id: ID!) {

enablePullRequestAutoMerge(input: {

pullRequestId: $id,

mergeMethod: MERGE

}) {

clientMutationId

}

}`

const variables = {

id: pullNodeId,

}

const graph: Record<string, unknown> = await github.graphql(mutation, variables)

console.log(`GraphQL mutation result:\n${JSON.stringify(graph)}`)

if (Array.isArray(graph.errors) && graph.errors.length > 0) {

console.error(

`ERROR! Failed to enable auto-merge:\n - ${(graph.errors as Array<{ message: string }>)

.map((error) => error.message)

.join('\n - ')}`,

)

} else {

console.log('Auto-merge enabled!')

}

}