Initial add

.github/workflows/dispatch.yml

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+name: Trigger CI
+on: push
+
+jobs:
+  build:
+    name: Dispatch to main repo
+    runs-on: ubuntu-latest
+    steps:
+      - name: Emit repository_dispatch
+        uses: mvasigh/dispatch-action@main
+        with:
+          # You should create a personal access token and store it in your repository
+          token: ${{ secrets.DISPATCH_AUTH }}
+          repo: dev
+          owner: codemirror
+          event_type: push

.gitignore

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+/node_modules
+package-lock.json
+/dist
+/test/*.js
+/test/*.d.ts
+/test/*.d.ts.map
+.tern-*

.npmignore

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+/src
+/test
+/node_modules
+.tern-*
+rollup.config.js
+tsconfig.json

LICENSE

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+MIT License
+
+Copyright (C) 2024 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+<!-- NOTE: README.md is generated from src/README.md -->
+
+# @codemirror/lang-yaml [![NPM version](https://img.shields.io/npm/v/@codemirror/lang-yaml.svg)](https://www.npmjs.org/package/@codemirror/lang-yaml)
+
+[ [**WEBSITE**](https://codemirror.net/) | [**ISSUES**](https://github.com/codemirror/dev/issues) | [**FORUM**](https://discuss.codemirror.net/c/next/) | [**CHANGELOG**](https://github.com/codemirror/lang-yaml/blob/main/CHANGELOG.md) ]
+
+This package implements YAML language support for the
+[CodeMirror](https://codemirror.net/) code editor.
+
+The [project page](https://codemirror.net/) has more information, a
+number of [examples](https://codemirror.net/examples/) and the
+[documentation](https://codemirror.net/docs/).
+
+This code is released under an
+[MIT license](https://github.com/codemirror/lang-yaml/tree/main/LICENSE).
+
+We aim to be an inclusive, welcoming community. To make that explicit,
+we have a [code of
+conduct](http://contributor-covenant.org/version/1/1/0/) that applies
+to communication around the project.
+
+## API Reference
+
+<dl>
+<dt id="user-content-yaml">
+  <code><strong><a href="#user-content-yaml">yaml</a></strong>() → <a href="https://codemirror.net/docs/ref#language.LanguageSupport">LanguageSupport</a></code></dt>
+
+<dd><p>Language support for YAML.</p>
+</dd>
+<dt id="user-content-yamllanguage">
+  <code><strong><a href="#user-content-yamllanguage">yamlLanguage</a></strong>: <a href="https://codemirror.net/docs/ref#language.LRLanguage">LRLanguage</a></code></dt>
+
+<dd><p>A language provider based on the <a href="https://github.com/lezer-parser/yaml">Lezer YAML
+parser</a>, extended with
+highlighting and indentation information.</p>
+</dd>
+</dl>

package.json

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+{
+  "name": "@codemirror/lang-yaml",
+  "version": "6.2.1",
+  "description": "YAML language support for the CodeMirror code editor",
+  "scripts": {
+    "test": "cm-runtests",
+    "prepare": "cm-buildhelper src/yaml.ts"
+  },
+  "keywords": [
+    "editor",
+    "code"
+  ],
+  "author": {
+    "name": "Marijn Haverbeke",
+    "email": "marijn@haverbeke.berlin",
+    "url": "http://marijnhaverbeke.nl"
+  },
+  "type": "module",
+  "main": "dist/index.cjs",
+  "exports": {
+    "import": "./dist/index.js",
+    "require": "./dist/index.cjs"
+  },
+  "types": "dist/index.d.ts",
+  "module": "dist/index.js",
+  "sideEffects": false,
+  "license": "MIT",
+  "dependencies": {
+    "@codemirror/autocomplete": "^6.0.0",
+    "@codemirror/language": "^6.0.0",
+    "@codemirror/state": "^6.0.0",
+    "@lezer/common": "^1.0.2",
+    "@lezer/yaml": "^1.0.0"
+  },
+  "devDependencies": {
+    "@codemirror/buildhelper": "^1.0.0"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/codemirror/lang-yaml.git"
+  }
+}

src/README.md

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+<!-- NOTE: README.md is generated from src/README.md -->
+
+# @codemirror/lang-yaml [![NPM version](https://img.shields.io/npm/v/@codemirror/lang-yaml.svg)](https://www.npmjs.org/package/@codemirror/lang-yaml)
+
+[ [**WEBSITE**](https://codemirror.net/) | [**ISSUES**](https://github.com/codemirror/dev/issues) | [**FORUM**](https://discuss.codemirror.net/c/next/) | [**CHANGELOG**](https://github.com/codemirror/lang-yaml/blob/main/CHANGELOG.md) ]
+
+This package implements YAML language support for the
+[CodeMirror](https://codemirror.net/) code editor.
+
+The [project page](https://codemirror.net/) has more information, a
+number of [examples](https://codemirror.net/examples/) and the
+[documentation](https://codemirror.net/docs/).
+
+This code is released under an
+[MIT license](https://github.com/codemirror/lang-yaml/tree/main/LICENSE).
+
+We aim to be an inclusive, welcoming community. To make that explicit,
+we have a [code of
+conduct](http://contributor-covenant.org/version/1/1/0/) that applies
+to communication around the project.
+
+## API Reference
+
+@yaml
+
+@yamlLanguage

src/yaml.ts

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+import {parser} from "@lezer/yaml"
+import {LRLanguage, delimitedIndent, indentNodeProp,
+        foldNodeProp, foldInside, LanguageSupport} from "@codemirror/language"
+import {SyntaxNode} from "@lezer/common"
+
+/// A language provider based on the [Lezer YAML
+/// parser](https://github.com/lezer-parser/yaml), extended with
+/// highlighting and indentation information.
+export const yamlLanguage = LRLanguage.define({
+  name: "yaml",
+  parser: parser.configure({
+    props: [
+      indentNodeProp.add({
+        Stream: cx => {
+          for (let before = cx.node.resolve(cx.pos, -1) as SyntaxNode | null;
+               before && before.to >= cx.pos; before = before.parent) {
+            if (before.name == "BlockLiteralContent" && before.from < before.to)
+              return cx.baseIndentFor(before)
+            if (before.name == "BlockLiteral")
+              return cx.baseIndentFor(before) + cx.unit
+            if (before.name == "BlockSequence" || before.name == "BlockMapping")
+              return cx.column(before.from, 1)
+            if (before.name == "QuotedLiteral")
+              return null
+            if (before.name == "Literal") {
+              let col = cx.column(before.from, 1)
+              if (col == cx.lineIndent(before.from, 1)) return col // Start on own line
+              if (before.to > cx.pos) return null
+            }
+          }
+          return null
+        },
+        FlowMapping: delimitedIndent({closing: "}"}),
+        FlowSequence: delimitedIndent({closing: "]"}),
+      }),
+      foldNodeProp.add({
+        "FlowMapping FlowSequence": foldInside,
+        "BlockSequence BlockMapping BlockLiteral":
+          (node, state) => ({from: state.doc.lineAt(node.from).to, to: node.to})
+      })
+    ]
+  }),
+  languageData: {
+    commentTokens: {line: "#"},
+    indentOnInput: /^\s*[\]\}]$/,
+  }
+})
+
+/// Language support for YAML.
+export function yaml() {
+  return new LanguageSupport(yamlLanguage)
+}