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[英]What is the difference between `main` and `module` vs `exports` in package.json?
[英]Can't import module using package.json "exports" in React
我正在尝试将 (typescript) package 导入到 (typescript) React 项目中。 此模块使用package.json
文件中的exports
属性来控制可以从中导入的内容。 但是,在我的 React 项目中,我无法使exports
中导出的路径起作用。 相反,我可以从模块中导入任何东西。 因此,例如,我使用exports
中的package.json
./certificate
但不是像这样导入:
import {test} from "certificationtypes/certificate"
我需要像这样导入:
import {test} from "certificationtypes/src/certificate"
(它还公开了所有其他未使用exports
指令导出的文件)。
这是模块的package.json
:
{
"name": "inputsvalidator",
"version": "1.0.0",
"description": "",
"main": "./build/src/index.js",
"exports": {
"./certificate": "./build/src/certificate.js"
},
"scripts": {
"build": "tsc",
"prepare": "npm run build",
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"devDependencies": {
"typescript": "^4.9.4"
},
"dependencies": {
"@types/validator": "^13.7.10",
"certificationtypes": "file:../certificationTypes",
"countries": "file:../../../../../lib/shared/countries",
"types": "file:../../../../../lib/shared/types",
"validator": "^13.7.0"
}
}
奇怪的是,这在 Node.js 项目中确实有效? 那么我还应该做些什么才能在我的 React 项目中完成这项工作。 我确实读过这应该使用 webpack 来支持。
我的 React 项目的package.json
:
{
"name": "front-end",
"version": "0.1.0",
"private": true,
"dependencies": {
"@testing-library/jest-dom": "^5.16.5",
"@testing-library/react": "^13.4.0",
"@testing-library/user-event": "^13.5.0",
"@types/jest": "^27.5.2",
"@types/node": "^16.18.11",
"@types/react": "^18.0.26",
"@types/react-dom": "^18.0.10",
"certificationtypes": "file:../../lib/shared/certificationTypes",
"countries": "file:../../../../lib/shared/countries",
"inputsvalidator": "file:../../lib/shared/inputsValidator",
"react": "^18.2.0",
"react-dom": "^18.2.0",
"react-scripts": "5.0.1",
"react-spinners": "^0.13.7",
"styled-components": "^5.3.6",
"typescript": "^4.9.4",
"validator": "^13.7.0",
"web-vitals": "^2.1.4"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": [
"react-app",
"react-app/jest"
]
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"devDependencies": {
"@types/styled-components": "^5.1.26"
},
"proxy": "http://localhost:3003"
}
默认情况下,TypeScript 在导入包时不会考虑 package.json 文件中的"exports"
字段。
在 TypeScript 4.7 或更高版本中,可以通过在当前项目中将moduleResolution
设置为"node16"
或"nodeNext"
来在编译器选项中显式启用此功能(import ed package 无法执行此设置),例如
// tsconfig.json
{
...
"compilerOptions": {
...
"moduleResolution": "node16",
...
},
...
}
请注意,这样做可能会意外破坏应用程序的其他部分,因为 package.json 中的其他设置也会开始发挥作用。
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