Set up Changesets for publishing

.changeset/README.md

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+# Changesets notes
+
+Create a release note with `yarn changeset`. Versioning is performed by the
+release workflow through `yarn changeset-version`; this regenerates
+`src/version.ts`, updates `CHANGELOG.md`, and commits the release changes. This
+is all handled automatically by the CI release process.
+
+Docs: https://github.com/changesets/changesets

.changeset/brave-ants-esm.md

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+---
+"graphile-worker": minor
+---
+
+Now published as pure ESM, but worry not as unflagged require(ESM) is now
+enabled by default in
+[Node 20.19.0+](https://nodejs.org/pt-br/blog/release/v20.19.0),
+[Node 22.12.0+](https://nodejs.org/en/blog/release/v22.12.0) and Node 24+ so
+everything should continue to work as before.

.changeset/bright-cats-config.md

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+---
+"graphile-worker": minor
+---
+
+For consistency, `cosmiconfig` is no longer supported for configuration; use
+`graphile.config.ts` instead. (This release will throw errors if you're using
+cosmisconfig, in later releases cosmiconfigs will not be detected.)

.changeset/calm-owls-tasks.md

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+---
+"graphile-worker": minor
+---
+
+TypeScript task files with `.ts` and `.mts` extensions are now recognized by
+default and loaded through Node's native type stripping if possible. Only
+erasable, verbatim TypeScript syntax is supported without a custom loader or
+precompilation. `.js`, `.cjs` and `.mjs` files are prioritised ahead of `.ts`
+and `.mts` files.

.changeset/clever-bees-exports.md

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+---
+"graphile-worker": minor
+---
+
+We now use the `exports` option, meaning sub-path imports
+(`require("graphile-worker/...")`) are no longer supported. If you need
+something not exported by default, raise an issue.

.changeset/config.json

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+{
+  "$schema": "https://unpkg.com/@changesets/config@4.0.0/schema.json",
+  "changelog": [
+    "@changesets/changelog-github",
+    {
+      "repo": "graphile/worker"
+    }
+  ],
+  "snapshot": {
+    "useCalculatedVersion": true,
+    "prereleaseTemplate": "aardvark.{tag}-{datetime}"
+  },
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.changeset/fresh-wolves-node.md

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+---
+"graphile-worker": minor
+---
+
+Since Node 20 is EOL, Node 22 is now the minimum supported version, per our
+[requirements documentation](https://worker.graphile.org/docs/requirements).

.changeset/quick-moles-log-level.md

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+---
+"graphile-worker": minor
+---
+
+`LogLevel` export is now type only - a string union rather than a TypeScript
+const enum.

.changeset/silly-tigers-runner.md

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+---
+"graphile-worker": minor
+---
+
+`Runner` gains `[Symbol.asyncDispose]()` method, so you can
+`await using runner = await run(...)` and the worker will be released when you
+reach the end of the scope. (Primarily useful for tests.)

.changeset/soft-eagles-local-queue.md

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+---
+"graphile-worker": patch
+---
+
+Fix issue where enabling `localQueue` could cause jobs from the same named queue
+to run concurrently (violating the serial execution guarantee for named queues):
+a single batch fetch could lock multiple jobs belonging to one named queue.
+Batch fetches now return at most one job per named queue (#621).

.changeset/tidy-pandas-maintenance.md

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+---
+"graphile-worker": patch
+---
+
+Maintenance work: upgrade to latest TypeScript, Jest, eliminate ts-node, fix
+yargs, use erasable syntax only for type-stripping support.

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+concurrency: ${{ github.workflow }}-${{ github.ref }}
+
+jobs:
+  release:
+    if: github.event_name == 'push' && github.ref_name == 'main'
+    name: Release
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+      pull-requests: write
+      issues: read
+      # Required for npm trusted publishing via GitHub Actions OIDC.
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v7
+
+      - name: Setup Node.js 24
+        uses: actions/setup-node@v7
+        with:
+          node-version: 24
+          cache: yarn
+
+      - name: Install dependencies
+        run: yarn --immutable
+
+      - name: Create release pull request or publish to npm
+        uses: changesets/action@v2
+        with:
+          version-script: yarn changeset-version
+          publish-script: yarn changeset-publish
+
+  snapshot:
+    if:
+      github.event_name == 'workflow_dispatch' && ( github.ref_name == 'main' ||
+      github.ref_name == 'next' )
+    name: Publish snapshot
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      pull-requests: read
+      issues: read
+      # Required for npm trusted publishing via GitHub Actions OIDC.
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v7
+
+      - name: Setup Node.js 24
+        uses: actions/setup-node@v7
+        with:
+          node-version: 24
+          cache: yarn
+
+      - name: Install dependencies
+        run: yarn --immutable
+
+      - name: Calculate snapshot version
+        run: |
+          yarn changeset version --snapshot "${{ github.ref_name }}"
+          node scripts/postversion.mjs
+        env:
+          CHANGESETS_NO_COMMIT: "1"
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Publish snapshot
+        run:
+          yarn prepack && yarn changeset publish --tag "snapshot-${{
+          github.ref_name }}" --no-git-tag