Add JSDoc based types

.gitignore

@@ -1,5 +1,6 @@
-.DS_Store
-*.log
 coverage/
 node_modules/
+.DS_Store
+*.d.ts
+*.log
 yarn.lock

.prettierignore

@@ -1,3 +1,2 @@
 coverage/
-*.json
 *.md

index.js

@@ -1,6 +1,12 @@
+/**
+ * @typedef {import('unist').Node} Node
+ * @typedef {import('unist').Parent} Parent
+ * @typedef {import('unified').Plugin<[]>} Plugin
+ */
+
 import {toString} from 'nlcst-to-string'
 import {convert} from 'unist-util-is'
-import {visit} from 'unist-util-visit'
+import {visit, SKIP} from 'unist-util-visit'
 import {pointStart, pointEnd} from 'unist-util-position'
 
 const source = 'retext-repeated-words'
@@ -21,12 +27,27 @@ const list = new Set([
   'mau'
 ])
 
-// Check for for repeated words.
+/**
+ * A retext plugin to check for for repeated words.
+ *
+ * * Doesn’t warn for some words which *do* occur twice (`the best exhibition
+ *   they had had since`)
+ * * Doesn’t warn for initialisms (`D. D. will pop up with…`)
+ * * Doesn’t warn for capitalised words (`Duran Duran…`)
+ *
+ * @type {Plugin}
+ */
 export default function retextRepeatedWords() {
+  /**
+   * @typedef {{value: string, child: Node, index: number}} Info
+   */
+
   return (tree, file) => {
-    visit(tree, 'SentenceNode', (parent) => {
+    visit(tree, 'SentenceNode', (/** @type {Parent} */ parent) => {
       let index = -1
+      /** @type {Info|undefined} */
       let previous
+      /** @type {Info|undefined} */
       let current
 
       while (++index < parent.children.length) {
@@ -37,7 +58,11 @@ export default function retextRepeatedWords() {
 
           current = {child, index, value}
 
-          if (previous && previous.value === value && !ignore(value)) {
+          if (
+            previous &&
+            previous.value.toLowerCase() === value.toLowerCase() &&
+            !ignore(value)
+          ) {
             Object.assign(
               file.message(
                 'Expected `' + value + '` once, not twice',
@@ -61,12 +86,17 @@ export default function retextRepeatedWords() {
         }
       }
 
-      return visit.SKIP
+      return SKIP
     })
   }
 }
 
-// Check if `value`, a word which occurs twice, should be ignored.
+/**
+ * Check if `value`, a word which occurs twice, should be ignored.
+ *
+ * @param {string} value
+ * @returns {boolean}
+ */
 function ignore(value) {
   // …the most heartening exhibition they had had since…
   if (list.has(value.toLowerCase())) {

package.json

@@ -27,29 +27,37 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
+  "types": "index.d.ts",
   "files": [
+    "index.d.ts",
     "index.js"
   ],
   "dependencies": {
     "nlcst-to-string": "^3.0.0",
+    "unified": "^10.0.0",
     "unist-util-is": "^5.0.0",
     "unist-util-position": "^4.0.0",
     "unist-util-visit": "^3.0.0"
   },
   "devDependencies": {
+    "@types/tape": "^4.0.0",
     "c8": "^7.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^9.0.0",
     "remark-preset-wooorm": "^8.0.0",
     "retext": "^8.0.0",
+    "rimraf": "^3.0.0",
     "tape": "^5.0.0",
+    "type-coverage": "^2.0.0",
+    "typescript": "^4.0.0",
     "xo": "^0.39.0"
   },
   "scripts": {
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage",
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
     "test-api": "node --conditions development test.js",
     "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov node --conditions development test.js",
-    "test": "npm run format && npm run test-coverage"
+    "test": "npm run build && npm run format && npm run test-coverage"
   },
   "prettier": {
     "tabWidth": 2,
@@ -66,5 +74,11 @@
     "plugins": [
       "preset-wooorm"
     ]
+  },
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true,
+    "ignoreCatch": true
   }
 }

test.js

@@ -2,7 +2,7 @@ import test from 'tape'
 import {retext} from 'retext'
 import retextRepeatedWords from './index.js'
 
-test('repeatedWords()', (t) => {
+test('retextRepeatedWords()', (t) => {
   t.deepEqual(
     JSON.parse(
       JSON.stringify(

tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "include": ["*.js"],
+  "compilerOptions": {
+    "target": "ES2020",
+    "lib": ["ES2020"],
+    "module": "ES2020",
+    "moduleResolution": "node",
+    "allowJs": true,
+    "checkJs": true,
+    "declaration": true,
+    "emitDeclarationOnly": true,
+    "allowSyntheticDefaultImports": true,
+    "skipLibCheck": true,
+    "strict": true
+  }
+}