命名空间未标记为仅类型声明 - Babel/Typescript

Question

我已经通过 npx create-react-app --typescript 创建了应用程序

由于 babel throw 错误，我想使用一些带有命名空间的自动生成的代码

我试过的：

1. 退出项目
2. 将 babel/core 更新为 7.7 https://github.com/babel/babel/issues/8244#issuecomment-507037823
3. 安装和配置https://babeljs.io/docs/en/next/babel-plugin-transform-typescript.html

    {
      "name": "frontend2",
      "version": "0.1.0",
      "private": true,
      "dependencies": {
        "@babel/core": "^7.7.2",
        "@babel/plugin-transform-typescript": "^7.7.2",
        "@svgr/webpack": "4.3.2",
        "@types/jest": "24.0.22",
        "@types/node": "12.12.7",
        "@types/react": "16.9.11",
        "@types/react-dom": "16.9.4",
        "@typescript-eslint/eslint-plugin": "^2.2.0",
        "@typescript-eslint/parser": "^2.2.0",
        "babel-eslint": "10.0.3",
        "babel-jest": "^24.9.0",
        "babel-loader": "8.0.6",
        "babel-plugin-named-asset-import": "^0.3.4",
        "babel-preset-react-app": "^9.0.2",
        "camelcase": "^5.2.0",
        "case-sensitive-paths-webpack-plugin": "2.2.0",
        "css-loader": "2.1.1",
        "dotenv": "6.2.0",
        "dotenv-expand": "5.1.0",
        "eslint": "^6.1.0",
        "eslint-config-react-app": "^5.0.2",
        "eslint-loader": "3.0.2",
        "eslint-plugin-flowtype": "3.13.0",
        "eslint-plugin-import": "2.18.2",
        "eslint-plugin-jsx-a11y": "6.2.3",
        "eslint-plugin-react": "7.14.3",
        "eslint-plugin-react-hooks": "^1.6.1",
        "file-loader": "3.0.1",
        "fs-extra": "7.0.1",
        "html-webpack-plugin": "4.0.0-beta.5",
        "identity-obj-proxy": "3.0.0",
        "is-wsl": "^1.1.0",
        "jest": "24.9.0",
        "jest-environment-jsdom-fourteen": "0.1.0",
        "jest-resolve": "24.9.0",
        "jest-watch-typeahead": "0.4.0",
        "mini-css-extract-plugin": "0.8.0",
        "optimize-css-assets-webpack-plugin": "5.0.3",
        "pnp-webpack-plugin": "1.5.0",
        "postcss-flexbugs-fixes": "4.1.0",
        "postcss-loader": "3.0.0",
        "postcss-normalize": "7.0.1",
        "postcss-preset-env": "6.7.0",
        "postcss-safe-parser": "4.0.1",
        "react": "^16.11.0",
        "react-app-polyfill": "^1.0.4",
        "react-dev-utils": "^9.1.0",
        "react-dom": "^16.11.0",
        "resolve": "1.12.0",
        "resolve-url-loader": "3.1.0",
        "sass-loader": "7.2.0",
        "semver": "6.3.0",
        "style-loader": "1.0.0",
        "terser-webpack-plugin": "1.4.1",
        "ts-pnp": "1.1.4",
        "typescript": "3.7.2",
        "url-loader": "2.1.0",
        "webpack": "4.41.0",
        "webpack-dev-server": "3.2.1",
        "webpack-manifest-plugin": "2.1.1",
        "workbox-webpack-plugin": "4.3.1"
      },
      "scripts": {
        "start": "node scripts/start.js",
        "build": "node scripts/build.js",
        "test": "node scripts/test.js"
      },
      "eslintConfig": {
        "extends": "react-app"
      },
      "browserslist": {
        "production": [
          ">0.2%",
          "not dead",
          "not op_mini all"
        ],
        "development": [
          "last 1 chrome version",
          "last 1 firefox version",
          "last 1 safari version"
        ]
      },
      "devDependencies": {},
      "jest": {
        "roots": [
          "<rootDir>/src"
        ],
        "collectCoverageFrom": [
          "src/**/*.{js,jsx,ts,tsx}",
          "!src/**/*.d.ts"
        ],
        "setupFiles": [
          "react-app-polyfill/jsdom"
        ],
        "setupFilesAfterEnv": [],
        "testMatch": [
          "<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}",
          "<rootDir>/src/**/*.{spec,test}.{js,jsx,ts,tsx}"
        ],
        "testEnvironment": "jest-environment-jsdom-fourteen",
        "transform": {
          "^.+\\.(js|jsx|ts|tsx)$": "<rootDir>/node_modules/babel-jest",
          "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
          "^(?!.*\\.(js|jsx|ts|tsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
        },
        "transformIgnorePatterns": [
          "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|ts|tsx)$",
          "^.+\\.module\\.(css|sass|scss)$"
        ],
        "modulePaths": [],
        "moduleNameMapper": {
          "^react-native$": "react-native-web",
          "^.+\\.module\\.(css|sass|scss)$": "identity-obj-proxy"
        },
        "moduleFileExtensions": [
          "web.js",
          "js",
          "web.ts",
          "ts",
          "web.tsx",
          "tsx",
          "json",
          "web.jsx",
          "jsx",
          "node"
        ],
        "watchPlugins": [
          "jest-watch-typeahead/filename",
          "jest-watch-typeahead/testname"
        ]
      },
      "babel": {
        "presets": [
          "react-app"
        ],
        "plugins": [
          [
            "@babel/plugin-transform-typescript",
            {
              "allowNamespaces": true
            }
          ]
        ]
      }
    }

但我仍然低于错误

./src/api/api.ts
SyntaxError: /home/owozniak/IdeaProjects/self-estem/src/main/java/org/owozniak/selfestem/frontend2/src/api/api.ts: Namespace not marked type-only declare. Non-declarative namespaces are only supported experimentally in Babel. To enable and review caveats see: https://babeljs.io/docs/en/babel-plugin-transform-typescript
  17 | }
  18 | 
> 19 | export namespace org.owozniak.selfestem.common.models {
     |                  ^^^
  20 | 
  21 |     export interface ProjectApi {
  22 |         readonly id: number;

Answer 1

就我而言，我不必弹出设置。我使用了带有cutomize-cra的包react-app- rewired。

1. 我创建了config-overrides.js来覆盖关于cra (create-react-app) 的配置

    /* config-overrides.js */
    const { override, useBabelRc } = require('customize-cra');
   
    module.exports = override(useBabelRc());
   

2. 我创建了.babelrc因为 jest 配置有一个文件babelTransform.js在这个文件中已经有一个属性usebabelrc: true那么你只需要添加在项目构建和启动时运行。

    /* .babelrc */
    {
        "plugins": [
            ["@babel/plugin-transform-typescript", { "allowNamespaces": true }]
        ]
    }
   

我不知道你是否使用react-app-rewired 但是如果你没有使用，你需要按照这个步骤的一些步骤来配置

Answer 2

Babel 将允许export declare namespace语法。
\nnamespace用标记仅限类型declare。

\n

常规的allowNamespacesright into.babelrc不适用于create-react-app.
\n您必须eject配置或使用脚本来覆盖那些而不弹出。

\n

注意： export namespace可用于标准 tsc 编译器，
\n所以如果您弹出配置，您可以使用它而不是 babel。

\n\n

@seeAlso: @babel/plugin-transform-typescript \xe2\x80\x94 公正命名空间支持

\n

\n

仅类型namespaces 应标记为declare，随后将被安全删除。

\n

namespace未标记的 sdeclare是实验性的，默认情况下禁用。不启用将导致错误：“命名空间未标记为仅类型declare。Babel 中仅实验性地支持非声明性命名空间。”

\n

解决方法：启用该allowNamespaces选项。

\n

\n