为什么在安装类型时不能解决类型错误? [英] Why aren't type errors resolved when I install types?
问题描述
我正在使用Visual Studio代码，打字稿，eslint和Jasmine编写单元测试.
I am using Visual Studio code, typescript, eslint, and Jasmine to write unit tests.
在安装eslint之前，我的代码已编译并运行良好.安装eslint后，运行npx eslint 'tsc/**'时出现错误，我在Visual Studio中也看到了这些错误.
Before I installed eslint, my code compiled and ran fine. Once I installed eslint, I got errors when I ran npx eslint 'tsc/**' I also see these errors in Visual Studio.
这些错误之一是'describe' is not defined.由于此功能来自Jasmine，因此我意识到我需要安装Jasmine类型.我是通过在命令行上输入以下命令来做到这一点的:npm i -D @types/jasmine
One of these errors is 'describe' is not defined. Since this function comes from Jasmine, I realized that I need to install Jasmine types. I did that by typing this on the command line: npm i -D @types/jasmine
安装类型后，在eslint和Visual Studio代码中运行命令行时，仍然出现这些错误.如果打开node_modules\@types\jasmine\index.d.ts文件，则会在其中看到以下行:
After installing the types, I still get these errors when I run the command line for eslint and in Visual Studio code. If I open up the node_modules\@types\jasmine\index.d.ts file, I see this line in it:
/**
* Create a group of specs (often called a suite).
* @param description Textual description of the group
* @param specDefinitions Function for Jasmine to invoke that will define inner suites a specs
*/
declare function describe(description: string, specDefinitions: () => void): void;
那为什么ESLint仍然抱怨这些类型没有定义?我对所有这些技术都是陌生的，所以我没有主意.
So why does ESLint still complain that these types are not defined? I'm very new to all of these technologies, so I'm out of ideas.
tsconfig.json:
tsconfig.json:
{
"compilerOptions": {
/* Basic Options */
// "incremental": true, /* Enable incremental compilation */
"target": "es5", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
"module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
"lib": ["es6","dom"], /* Specify library files to be included in the compilation. */
"allowJs": false, /* Allow javascript files to be compiled. */
// "checkJs": true, /* Report errors in .js files. */
// "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
// "declaration": true, /* Generates corresponding '.d.ts' file. */
// "declarationMap": true, /* Generates a sourcemap for each corresponding '.d.ts' file. */
// "sourceMap": true, /* Generates corresponding '.map' file. */
// "outFile": "./", /* Concatenate and emit output to single file. */
"outDir": "tscbuild", /* Redirect output structure to the directory. */
"rootDir": "tsc", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
// "composite": true, /* Enable project compilation */
// "tsBuildInfoFile": "./", /* Specify file to store incremental compilation information */
// "removeComments": true, /* Do not emit comments to output. */
// "noEmit": true, /* Do not emit outputs. */
// "importHelpers": true, /* Import emit helpers from 'tslib'. */
// "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
// "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
/* Strict Type-Checking Options */
"strict": true, /* Enable all strict type-checking options. */
"noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
"strictNullChecks": true, /* Enable strict null checks. */
"strictFunctionTypes": true, /* Enable strict checking of function types. */
"strictBindCallApply": true, /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
"strictPropertyInitialization": true, /* Enable strict checking of property initialization in classes. */
// "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
"alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */
/* Additional Checks */
"noUnusedLocals": true, /* Report errors on unused locals. */
// "noUnusedParameters": true, /* Report errors on unused parameters. */
"noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
"noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
/* Module Resolution Options */
// "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
// "baseUrl": "./", /* Base directory to resolve non-absolute module names. */
// "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
// "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */
// "typeRoots": [], /* List of folders to include type definitions from. */
// "types": [], /* Type declaration files to be included in compilation. */
// "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
"esModuleInterop": true, /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
// "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */
// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
/* Source Map Options */
// "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */
// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */
// "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
/* Experimental Options */
// "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */
// "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */
/* Advanced Options */
"resolveJsonModule": true, /* Include modules imported with '.json' extension */
"forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */
}
}
.eslintrc.js
.eslintrc.js
module.exports = {
env: {
browser: true,
es6: true,
node: true
},
extends: ["airbnb-base"],
globals: {
Atomics: "readonly",
SharedArrayBuffer: "readonly"
},
parser: "@typescript-eslint/parser",
parserOptions: {
ecmaVersion: 2018
},
plugins: ["@typescript-eslint"],
rules: {
quotes: ["error", "double"],
}
};
我意识到错误可能出在我使用Jasmine的方式上，所以这是该文件的摘录:
I realize the error may lie in the way I am using Jasmine, so here's an excerpt of that file:
import "jasmine";
import "./app";
console.log("spec");
describe("App", () => {
describe("rest()", () => {
it("should subtract actions remaining", () => {
(global as any).State.variables.actions_remaining = 5;
(global as any).setup.rest();
expect((global as any).State.variables.actions_remaining).toBe(4);
});
it("will not let you go below zero actions remaining", () => {
(global as any).State.variables.actions_remaining = 0;
(global as any).setup.rest();
expect((global as any).State.variables.actions_remaining).toBe(0);
});
推荐答案
好吧，我通过更改测试来消除这些错误:
okay I got these errors to go away by changing my test:
import * as j from "jasmine";
import "./app";
console.log("spec");
j.describe("App", () => {
j.describe("rest()", () => {
j.it("should subtract actions remaining", () => {
(global as any).State.variables.actions_remaining = 5;
(global as any).setup.rest();
j.expect((global as any).State.variables.actions_remaining).toBe(4);
});
j.it("will not let you go below zero actions remaining", () => {
(global as any).State.variables.actions_remaining = 0;
(global as any).setup.rest();
j.expect((global as any).State.variables.actions_remaining).toBe(0);
});
当您不使用ESLint时，可以将Jasmine函数用作全局变量.但是要编译此文件，我必须参考Jasmine导入.
When you're not using ESLint, you can use Jasmine functions as globals. But to get this to compile, I have to refer to the Jasmine import.
是否有办法避免这种情况，所以我不必在每个Jasmine函数前加上j.并仍然获得类型安全的所有好处?
Is there a way to avoid this so I don't have to preface every Jasmine function with j. and still get all the benefits of type safety?
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