Add initial implementation

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.github/workflows/main.yml

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+name: main
+on:
+  - pull_request
+  - push
+jobs:
+  main:
+    name: ${{matrix.node}}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: ${{matrix.node}}
+      - run: npm install
+      - run: npm test
+      - uses: codecov/codecov-action@v3
+    strategy:
+      matrix:
+        node:
+          - lts/fermium
+          - node

.gitignore

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+.DS_Store
+*.d.ts
+*.log
+*.tgz
+coverage/
+node_modules/
+yarn.lock

.npmrc

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+package-lock=false

.prettierignore

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+coverage/
+*.md

index.js

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+export {toPoint, toPosition, fromPoint, fromPosition} from './lib/index.js'

lib/index.js

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+/**
+ * @typedef {import('unist').Point} Point
+ * @typedef {import('unist').Position} UnistPosition
+ * @typedef {import('vscode-languageserver-types').Position} LspPosition
+ * @typedef {import('vscode-languageserver-types').Range} Range
+ */
+
+/**
+ * Convert a unist point to an LSP position.
+ *
+ * @param {Point} point The unist point to convert.
+ * @returns {LspPosition} The point converted to an LSP position.
+ */
+export function fromPoint(point) {
+  return {
+    character: point.column - 1,
+    line: point.line - 1
+  }
+}
+
+/**
+ * Convert an LSP position to a unist point.
+ *
+ * @param {LspPosition} position The LSP position to convert.
+ * @returns {Point} The position converted to a unist point.
+ */
+export function toPoint(position) {
+  return {
+    column: position.character + 1,
+    line: position.line + 1
+  }
+}
+
+/**
+ * Convert a unist position to an LSP range.
+ *
+ * @param {UnistPosition} position The unist position to convert.
+ * @returns {Range} The position converted to an LSP range.
+ */
+export function fromPosition(position) {
+  return {
+    start: fromPoint(position.start),
+    end: fromPoint(position.end)
+  }
+}
+
+/**
+ * Convert an LSP range to a unist position.
+ *
+ * @param {Range} range The LSP range to convert.
+ * @returns {UnistPosition} The range converted to a unist position.
+ */
+export function toPosition(range) {
+  return {
+    start: toPoint(range.start),
+    end: toPoint(range.end)
+  }
+}

package.json

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+{
+  "name": "unist-lsp",
+  "version": "0.0.0",
+  "description": "Utility to convert between unist and language server protocol",
+  "license": "MIT",
+  "keywords": [
+    "unist",
+    "util",
+    "utility",
+    "lsp",
+    "language-server-protocol"
+  ],
+  "repository": "syntax-tree/unist-lsp",
+  "bugs": "https://github.com/syntax-tree/unist-lsp/issues",
+  "funding": {
+    "type": "opencollective",
+    "url": "https://opencollective.com/unified"
+  },
+  "author": "Remco Haszing <remcohaszing@gmail.com>",
+  "contributors": [
+    "Remco Haszing <remcohaszing@gmail.com>"
+  ],
+  "sideEffects": false,
+  "type": "module",
+  "exports": "./index.js",
+  "files": [
+    "index.d.ts",
+    "index.js"
+  ],
+  "dependencies": {
+    "@types/unist": "^2.0.0",
+    "vscode-languageserver-types": "^3.0.0"
+  },
+  "devDependencies": {
+    "@types/tape": "^4.0.0",
+    "c8": "^7.0.0",
+    "prettier": "^2.0.0",
+    "remark-cli": "^11.0.0",
+    "remark-preset-wooorm": "^9.0.0",
+    "tape": "^5.0.0",
+    "type-coverage": "^2.0.0",
+    "typescript": "^4.0.0",
+    "xo": "^0.52.0"
+  },
+  "scripts": {
+    "prepack": "npm run build && npm run format",
+    "build": "tsc && type-coverage",
+    "format": "remark . -qfo && prettier -w . --loglevel warn  && xo --fix",
+    "test-api": "node test/index.js",
+    "test-coverage": "c8 --100 --reporter lcov node test/index.js",
+    "test": "npm run build && npm run format && npm run test-coverage"
+  },
+  "prettier": {
+    "tabWidth": 2,
+    "useTabs": false,
+    "singleQuote": true,
+    "bracketSpacing": false,
+    "semi": false,
+    "trailingComma": "none"
+  },
+  "xo": {
+    "prettier": true
+  },
+  "remarkConfig": {
+    "plugins": [
+      "preset-wooorm"
+    ]
+  },
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true
+  }
+}