Question

我的最终目标是建立一个npm软件包的功能库。我遇到错误“ x不是函数”。因此，我整理了一个基本示例，如下所示。

package.json

{
  "name": "@klequis/npm-step-by-step",
  "version": "0.0.1",
  "description": "learning npm-packaging step by step",
  "main": "index.js",
  "scripts": {
    "build": "babel src --out-dir lib"
  },
  "keywords": [],
  "author": "",
  "license": "MIT",
  "devDependencies": {
    "@babel/cli": "^7.2.3",
    "@babel/core": "^7.3.3",
    "@babel/preset-env": "^7.3.1"
  }
}

babel.config.js

const presets = [
  [
    "@babel/env",
    {
      targets: {
        edge: "17",
        firefox: "60",
        chrome: "67",
        safari: "11.1",
      },
      useBuiltIns: "usage",
    },
  ],
];

module.exports = { presets };

src / add.js

const add = (a, b) => {
  return a + b
}
export default add

lib / add.js-运行构建后的结果

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

const add = (a, b) => {
  return a + b;
};

var _default = add;
exports.default = _default;

test.js

var add = require('./lib/add')

console.log(add(1,3))

在test.js中，VS Code在消息中立即在“ add”下划线：无法调用类型缺少调用签名的表达式。类型'importof type（“ / home / me / dev / learn / npm-packaging / step-by-step / lib / add”）没有兼容的呼叫签名。

在Commandlien上使用节点运行

$ node test.js

结果

/home/me/dev/learn/npm-packaging/step-by-step/test.js:3
console.log(add(1,3))
            ^

TypeError: add is not a function
    at Object.<anonymous> (/home/me/dev/learn/npm-packaging/step-by-step/test.js:3:13)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)

使用Babel时add不是函数

0 个答案: