“没有出口主要的出口主要定义”错误node.js
我正在尝试使用JS进行简单的API。但是我一直遇到这个愚蠢的错误。注意：这是我第一次在JS中编程。
代码：
const express = require('express')
const app = express()
const { Canvas } = require('canvas-constructor')
const canvas = require('canvas')
app.get('/:feed', async (req, res) => {
const img = await canvas.loadImage('https://i.pinimg.com/originals/30/82/b0/3082b0354572c4d37af6994b4e8baa43.png')
let image = new Canvas(670, 435)
.printImage(img, 0, 0, 670, 435)
.setTextFont('28px Impact')
.printText(req.params.feed, 40, 150)
.toBuffer();
res.set({'Content-Type': 'image/png'})
res.send(image)//sending the image!
})
app.listen(8080)
错误：
Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main defined in /home/runner/ScarceExcellentVariables/node_modules/canvas-constructor/package.json
at new NodeError (node:internal/errors:371:5)
at throwExportsNotFound (node:internal/modules/esm/resolve:440:9)
at packageExportsResolve (node:internal/modules/esm/resolve:692:3)
at resolveExports (node:internal/modules/cjs/loader:482:36)
at Function.Module._findPath (node:internal/modules/cjs/loader:522:31)
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:919:27)
at Function.Module._load (node:internal/modules/cjs/loader:778:27)
at Module.require (node:internal/modules/cjs/loader:1005:19)
at require (node:internal/modules/cjs/helpers:102:18)
如果有人可以帮助我，我会很感激
I'm trying to make a simple api with js. But i keep getting this stupid error. NOTE: This is my first time programming in js.
Code:
const express = require('express')
const app = express()
const { Canvas } = require('canvas-constructor')
const canvas = require('canvas')
app.get('/:feed', async (req, res) => {
const img = await canvas.loadImage('https://i.pinimg.com/originals/30/82/b0/3082b0354572c4d37af6994b4e8baa43.png')
let image = new Canvas(670, 435)
.printImage(img, 0, 0, 670, 435)
.setTextFont('28px Impact')
.printText(req.params.feed, 40, 150)
.toBuffer();
res.set({'Content-Type': 'image/png'})
res.send(image)//sending the image!
})
app.listen(8080)
Error:
Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main defined in /home/runner/ScarceExcellentVariables/node_modules/canvas-constructor/package.json
at new NodeError (node:internal/errors:371:5)
at throwExportsNotFound (node:internal/modules/esm/resolve:440:9)
at packageExportsResolve (node:internal/modules/esm/resolve:692:3)
at resolveExports (node:internal/modules/cjs/loader:482:36)
at Function.Module._findPath (node:internal/modules/cjs/loader:522:31)
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:919:27)
at Function.Module._load (node:internal/modules/cjs/loader:778:27)
at Module.require (node:internal/modules/cjs/loader:1005:19)
at require (node:internal/modules/cjs/helpers:102:18)
If anyone could help me i'd appreciate it
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评论（2）
您指的是的软件包您要选择它应该用来渲染图形的内容。您可以导入：
canvas-constructor/napi-rs或canvas-constructor/skia-canvas或canvas-constructor/canvas，但您可以' t导入
canvas-constructor本身。如果选择NAPI-RS首先需要安装该软件包。这三个选项的链接是在readme file 中。包装有两种类型：
从“ ./ x.js”）。
但仍然支持，
x = requient 的节点版本中。Code> requient（）您可能会缺少名为
node的依赖性：util在较旧 尽管该软件包与节点14及以上兼容，但请确保您使用的是最近版本。The package you refer to requires you to pick what it should use to render graphics. You can import:
canvas-constructor/napi-rsorcanvas-constructor/skia-canvasorcanvas-constructor/canvasBut you can't import
canvas-constructorby itself. If you picknapi-rsyou would first need to install that package. A link to these three options are in the README file.There are two types of packages:
import x from "./x.js")x = require("./x.js").The authors of
canvas-constructormade sure it works with both.However, if you use
require()you may be missing a dependency namednode:util. In older Node versions it's only available when usingimport.Because of this, even though the package is listed as compatible with Node 14 and up, make sure you are using a recent version.
https://www.npmjs.com/package/package/package/canvas-constructor
是ES6软件包，当您使用常见的JS（nodejs默认）时，您可以使用其他软件包或修改Nodejs项目以使用ES6标准。
要修改您的项目设置，您可能想遵循此答案。
https://stackoverflow.com/a/a/29415291/13776400
https://www.npmjs.com/package/canvas-constructor
is an ES6 package, while you are using common js (nodejs default) you can either use a different package or modify your nodejs project to use ES6 standards.
To modify your project settings you may wanna follow this answer.
https://stackoverflow.com/a/29415291/13776400