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[英]CommonJS Illegal invocation error when calling function on module.exports
[英]Migrating a CommonJS 'module.exports = function()' to ESM
我正在使用 NodeJS,并且已经编写 JavaScript 几年了,并且仍在学习。
对于我的 CJS 模块,我编写(我称之为)一个包含所有(我称之为)我的子函数的根函数,然后在我想要公开的函数的根函数上return {subfunction1, subfunction2}
。 不可否认,我从Jonathan Mills那里学到了这种写作风格,并且对它很满意。
我正在努力解决如何将其从 CommonJS 正确迁移到 ESM 并且希望在不使用Class
的情况下这样做。 但是,如果Class
是 ESM 的正确方式,那么我会适应。
这是一个 CJS 服务:
service.js
function WebexService(webex) {
async function processMessage(messageData) {
try {
const user = await webex.people.get(messageData.personId);
//debug(user);
sendMessage({ displayName: user.displayName, roomId: messageData.roomId });
} catch (error) {
debug(error);
throw error;
}
}
function sendMessage(messageInfo) {
webex.messages.create({
roomId: messageInfo.roomId,
text: `Howdy! ${messageInfo.displayName}`,
});
}
return { processMessage }
}
module.exports = WebexService()
要使用此 CJS 服务,我会将其导入为:
app.js
const { processMessage } = require('../services/webexService');
function superCool() {
const messageResponse = await processMessage(messageData);
}
我能够让它与 ESM 一起工作的唯一方法是作为一个Class
:
service.js
import debugInit from 'debug';
import chalk from 'chalk';
const debug = debugInit('app:services:webex');
export default class WebexService {
constructor(webex) {
this.webex = webex;
}
async processMessage(messageData) {
try {
const user = await this.webex.people.get(messageData.personId);
//debug(user);
this.sendMessage({ displayName: user.displayName, roomId: messageData.roomId });
} catch (error) {
debug(error);
throw error;
}
}
sendMessage(messageInfo) {
this.webex.messages.create({
roomId: messageInfo.roomId,
text: `Howdy! ${messageInfo.displayName}`,
});
}
}
app.js
import WebexService from '../services/webex.js';
const WebexServiceInstance = new WebexService(webex);
WebexServiceInstance.processMessage(event.data);
我希望有人能指出我正确的方向。 如果有人可以帮助我找到一个可以阅读的内容,我很高兴 RTFM。
service.js
function WebexService(webex) {
async function processMessage(messageData) {
try {
const user = await webex.people.get(messageData.personId);
//debug(user);
sendMessage({ displayName: user.displayName, roomId: messageData.roomId });
} catch (error) {
debug(error);
throw error;
}
}
function sendMessage(messageInfo) {
webex.messages.create({
roomId: messageInfo.roomId,
text: `Howdy! ${messageInfo.displayName}`,
});
}
return { processMessage }
}
const service = WebexService()
export default service
app.js
import WebexService from '../services/webex.js';
// you can then do this
const { processMessage } = WebexService;
function superCool() {
const messageResponse = await processMessage(messageData);
}
// or just use it directly
function superCool() {
const messageResponse = await WebexService.processMessage(messageData);
}
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