feat: 动态import可选依赖

babel.config.js

@@ -1,7 +1,7 @@
 module.exports = {
   presets: [
-    [ '@babel/preset-env', {targets: {node: 'current'}} ],
-    [ '@babel/preset-typescript', {allExtensions: true}],
+    [ "@babel/preset-env", {targets: {node: "current"}} ],
+    [ "@babel/preset-typescript", {allExtensions: true}],
   ],
-  'compact': true,
+  "compact": true,
 };

src/segment.ts

@@ -1,7 +1,7 @@
-import nodejieba from "nodejieba";
-import { load, cut /*, tag */ } from "@node-rs/jieba";
+// import nodejieba from "nodejieba";
+// import { load, cut /*, tag */ } from "@node-rs/jieba";
 // @ts-ignore
-import { Segment, useDefault } from "segmentit";
+// import { Segment, useDefault } from "segmentit";
 import type { IPinyinSegment } from "./declare";
 
 let nodeRsJiebaLoaded = false; // @node-rs/jieba 加载词典。
@@ -15,6 +15,7 @@ let hansIntlSegmenter: any; // Intl.Segmenter
 export function segment(hans: string, segment?: IPinyinSegment): string[] {
   // @node-rs/jieba (Rust)
   if (segment === "@node-rs/jieba") {
+    const { load, cut /*, tag */ } = require("@node-rs/jieba");
     if (!nodeRsJiebaLoaded) {
       nodeRsJiebaLoaded = true;
       load();
@@ -25,6 +26,7 @@ export function segment(hans: string, segment?: IPinyinSegment): string[] {
 
   // segmentit (Node.js)
   if (segment === "segmentit") {
+    const { Segment, useDefault } = require("segmentit");
     if (!segmentit) {
       segmentit = useDefault(new Segment());
     }
@@ -45,9 +47,9 @@ export function segment(hans: string, segment?: IPinyinSegment): string[] {
     }
   }
 
+  const nodejieba = require("nodejieba");
   // 默认使用 nodejieba (C++)
   // return nodejieba.tag(hans);
   // nodejieba 定义的类型返回值错误，先忽略。
-  // @ts-ignore
-  return nodejieba.cutSmall(hans, 4);
+  return nodejieba.cutSmall(hans, 4) as unknown as string[];
 }