feat: Add ESM, stricter TS

package.json

@@ -31,6 +31,11 @@
     },
     "main": "lib/index.js",
     "types": "lib/index.d.ts",
+    "module": "lib/esm/index.js",
+    "exports": {
+        "require": "./lib/index.js",
+        "import": "./lib/esm/index.js"
+    },
     "files": [
         "lib/**/*"
     ],
@@ -44,7 +49,9 @@
         "format:es": "npm run lint:es -- --fix",
         "format:prettier": "npm run format:prettier:raw -- --write",
         "format:prettier:raw": "prettier '**/*.{ts,md,json,yml}'",
-        "build": "tsc",
+        "build": "npm run build:cjs && npm run build:esm",
+        "build:cjs": "tsc --sourceRoot https://raw.githubusercontent.com/fb55/htmlparser2/$(git rev-parse HEAD)/src/",
+        "build:esm": "npm run build:cjs -- --module esnext --target es2019 --outDir lib/esm && echo '{\"type\":\"module\"}' > lib/esm/package.json",
         "prepare": "npm run build"
     },
     "dependencies": {
@@ -67,7 +74,11 @@
     },
     "jest": {
         "preset": "ts-jest",
-        "testEnvironment": "node"
+        "testEnvironment": "node",
+        "coverageProvider": "v8",
+        "moduleNameMapper": {
+            "^(.*)\\.js$": "$1"
+        }
     },
     "prettier": {
         "tabWidth": 4

src/FeedHandler.ts

@@ -1,6 +1,6 @@
 import DomHandler, { DomHandlerOptions } from "domhandler";
 import { getFeed, Feed } from "domutils";
-import { Parser, ParserOptions } from "./Parser";
+import { Parser, ParserOptions } from "./Parser.js";
 
 export { getFeed };
 
@@ -24,7 +24,7 @@ export class FeedHandler extends DomHandler {
         super(callback, options);
     }
 
-    onend(): void {
+    override onend(): void {
         const feed = getFeed(this.dom);
 
         if (feed) {

src/Parser.ts

@@ -1,5 +1,5 @@
-import Tokenizer, { Callbacks, QuoteType } from "./Tokenizer";
-import decodeCodePoint from "entities/lib/decode_codepoint";
+import Tokenizer, { Callbacks, QuoteType } from "./Tokenizer.js";
+import { decodeCodePoint } from "entities/lib/decode.js";
 
 const formTags = new Set([
     "input",

src/Tokenizer.ts

@@ -3,7 +3,7 @@ import {
     xmlDecodeTree,
     BinTrieFlags,
     determineBranch,
-} from "entities/lib/decode";
+} from "entities/lib/decode.js";
 
 const enum CharCodes {
     Tab = 0x9, // "\t"

src/WritableStream.ts

@@ -1,4 +1,4 @@
-import { Parser, Handler, ParserOptions } from "./Parser";
+import { Parser, Handler, ParserOptions } from "./Parser.js";
 /*
  * NOTE: If either of these two imports produces a type error,
  * please update your @types/node dependency!
@@ -25,14 +25,18 @@ export class WritableStream extends Writable {
         this._parser = new Parser(cbs, options);
     }
 
-    _write(chunk: string | Buffer, encoding: string, cb: () => void): void {
+    override _write(
+        chunk: string | Buffer,
+        encoding: string,
+        cb: () => void
+    ): void {
         this._parser.write(
             isBuffer(chunk, encoding) ? this._decoder.write(chunk) : chunk
         );
         cb();
     }
 
-    _final(cb: () => void): void {
+    override _final(cb: () => void): void {
         this._parser.end(this._decoder.end());
         cb();
     }

src/index.ts

@@ -1,5 +1,5 @@
-import { Parser, ParserOptions } from "./Parser";
-export { Parser, ParserOptions };
+import { Parser, ParserOptions } from "./Parser.js";
+export { Parser, type ParserOptions };
 
 import {
     DomHandler,
@@ -9,7 +9,7 @@ import {
     Document,
 } from "domhandler";
 
-export { DomHandler, DomHandlerOptions };
+export { DomHandler, type DomHandlerOptions };
 
 type Options = ParserOptions & DomHandlerOptions;
 
@@ -57,8 +57,8 @@ export function createDomStream(
 
 export {
     default as Tokenizer,
-    Callbacks as TokenizerCallbacks,
-} from "./Tokenizer";
+    type Callbacks as TokenizerCallbacks,
+} from "./Tokenizer.js";
 import * as ElementType from "domelementtype";
 export { ElementType };
 
@@ -67,9 +67,9 @@ export { ElementType };
  * They should probably be removed eventually.
  */
 
-export * from "./FeedHandler";
+export * from "./FeedHandler.js";
 export * as DomUtils from "domutils";
 
 // Old names for Dom- & FeedHandler
 export { DomHandler as DefaultHandler };
-export { FeedHandler as RssHandler } from "./FeedHandler";
+export { FeedHandler as RssHandler } from "./FeedHandler.js";

tsconfig.json

@@ -1,27 +1,32 @@
 {
     "compilerOptions": {
         /* Basic Options */
-        "target": "es5" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */,
-        "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
-        // "lib": [],                             /* Specify library files to be included in the compilation. */
-        "declaration": true /* Generates corresponding '.d.ts' file. */,
-        "declarationMap": true /* Generates a sourcemap for each corresponding '.d.ts' file. */,
-        // "sourceMap": true,                     /* Generates corresponding '.map' file. */
-        "outDir": "lib" /* Redirect output structure to the directory. */,
-        // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+        "target": "es5",
+        "module": "commonjs",
+        "lib": ["ES2015.Core"],
+        "declaration": true,
+        "declarationMap": true,
+        "sourceMap": true,
+        "outDir": "lib",
 
         /* Strict Type-Checking Options */
-        "strict": true /* Enable all strict type-checking options. */,
+        "strict": true,
 
         /* Additional Checks */
-        "noUnusedLocals": true /* Report errors on unused locals. */,
-        "noUnusedParameters": true /* Report errors on unused parameters. */,
-        "noImplicitReturns": true /* Report error when not all code paths in function return a value. */,
-        "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */,
+        "exactOptionalPropertyTypes": true,
+        "forceConsistentCasingInFileNames": true,
+        "importsNotUsedAsValues": "error",
+        "isolatedModules": true,
+        "noFallthroughCasesInSwitch": true,
+        "noImplicitOverride": true,
+        "noImplicitReturns": true,
+        "noPropertyAccessFromIndexSignature": true,
+        "noUnusedLocals": true,
+        "noUnusedParameters": true,
 
         /* Module Resolution Options */
-        // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
-        "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
+        "esModuleInterop": true,
+        "moduleResolution": "node",
         "resolveJsonModule": true
     },
     "include": ["src"],