I am creating a NodeJS and MongoDB library for CRUD operations on APIs. I am trying to create an interface with Typescript for the url and database name, as follows:
but I get the following error:
interface IConfig {
url: string
name: string
}
export default IConfig
Parsing error: The keyword 'interface' is reserved
I am using standardjs as a linter, and this is my tsconfig file:
{
"compilerOptions": {
/* Visit https://aka.ms/tsconfig.json to read more about this file */
/* Projects */
// "incremental": true, /* Enable incremental compilation */
// "composite": true, /* Enable constraints that allow a TypeScript project to be used with project references. */
// "tsBuildInfoFile": "./", /* Specify the folder for .tsbuildinfo incremental compilation files. */
// "disableSourceOfProjectReferenceRedirect": true, /* Disable preferring source files instead of declaration files when referencing composite projects */
// "disableSolutionSearching": true, /* Opt a project out of multi-project reference checking when editing. */
// "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */
/* Language and Environment */
"target": "es2020", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
// "lib": [], /* Specify a set of bundled library declaration files that describe the target runtime environment. */
// "jsx": "preserve", /* Specify what JSX code is generated. */
"experimentalDecorators": true, /* Enable experimental support for TC39 stage 2 draft decorators. */
"emitDecoratorMetadata": true, /* Emit design-type metadata for decorated declarations in source files. */
// "jsxFactory": "", /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h' */
// "jsxFragmentFactory": "", /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
// "jsxImportSource": "", /* Specify module specifier used to import the JSX factory functions when using `jsx: react-jsx*`.` */
// "reactNamespace": "", /* Specify the object invoked for `createElement`. This only applies when targeting `react` JSX emit. */
// "noLib": true, /* Disable including any library files, including the default lib.d.ts. */
// "useDefineForClassFields": true, /* Emit ECMAScript-standard-compliant class fields. */
/* Modules */
"module": "commonjs", /* Specify what module code is generated. */
// "rootDir": "./src", /* Specify the root folder within your source files. */
// "moduleResolution": "node", /* Specify how TypeScript looks up a file from a given module specifier. */
// "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */
// "paths": {}, /* Specify a set of entries that re-map imports to additional lookup locations. */
// "rootDirs": [], /* Allow multiple folders to be treated as one when resolving modules. */
// "typeRoots": [], /* Specify multiple folders that act like `./node_modules/@types`. */
// "types": [], /* Specify type package names to be included without being referenced in a source file. */
// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
// "resolveJsonModule": true, /* Enable importing .json files */
// "noResolve": true, /* Disallow `import`s, `require`s or `<reference>`s from expanding the number of files TypeScript should add to a project. */
/* JavaScript Support */
// "allowJs": true, /* Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files. */
// "checkJs": true, /* Enable error reporting in type-checked JavaScript files. */
// "maxNodeModuleJsDepth": 1, /* Specify the maximum folder depth used for checking JavaScript files from `node_modules`. Only applicable with `allowJs`. */
/* Emit */
"declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
"declarationMap": true, /* Create sourcemaps for d.ts files. */
// "emitDeclarationOnly": true, /* Only output d.ts files and not JavaScript files. */
"sourceMap": true, /* Create source map files for emitted JavaScript files. */
// "outFile": "./", /* Specify a file that bundles all outputs into one JavaScript file. If `declaration` is true, also designates a file that bundles all .d.ts output. */
"outDir": "./lib", /* Specify an output folder for all emitted files. */
// "removeComments": true, /* Disable emitting comments. */
// "noEmit": true, /* Disable emitting files from a compilation. */
// "importHelpers": true, /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
// "importsNotUsedAsValues": "remove", /* Specify emit/checking behavior for imports that are only used for types */
// "downlevelIteration": true, /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
// "sourceRoot": "", /* Specify the root path for debuggers to find the reference source code. */
// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true, /* Include sourcemap files inside the emitted JavaScript. */
// "inlineSources": true, /* Include source code in the sourcemaps inside the emitted JavaScript. */
// "emitBOM": true, /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
// "newLine": "crlf", /* Set the newline character for emitting files. */
// "stripInternal": true, /* Disable emitting declarations that have `@internal` in their JSDoc comments. */
// "noEmitHelpers": true, /* Disable generating custom helper functions like `__extends` in compiled output. */
// "noEmitOnError": true, /* Disable emitting files if any type checking errors are reported. */
// "preserveConstEnums": true, /* Disable erasing `const enum` declarations in generated code. */
// "declarationDir": "./", /* Specify the output directory for generated declaration files. */
// "preserveValueImports": true, /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
/* Interop Constraints */
// "isolatedModules": true, /* Ensure that each file can be safely transpiled without relying on other imports. */
// "allowSyntheticDefaultImports": true, /* Allow 'import x from y' when a module doesn't have a default export. */
"esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */
// "preserveSymlinks": true, /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
"forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */
/* Type Checking */
"strict": true, /* Enable all strict type-checking options. */
"noImplicitAny": true, /* Enable error reporting for expressions and declarations with an implied `any` type.. */
"strictNullChecks": true, /* When type checking, take into account `null` and `undefined`. */
"strictFunctionTypes": true, /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
"strictBindCallApply": true, /* Check that the arguments for `bind`, `call`, and `apply` methods match the original function. */
"strictPropertyInitialization": true, /* Check for class properties that are declared but not set in the constructor. */
"noImplicitThis": true, /* Enable error reporting when `this` is given the type `any`. */
"useUnknownInCatchVariables": true, /* Type catch clause variables as 'unknown' instead of 'any'. */
"alwaysStrict": true, /* Ensure 'use strict' is always emitted. */
"noUnusedLocals": true, /* Enable error reporting when a local variables aren't read. */
"noUnusedParameters": true, /* Raise an error when a function parameter isn't read */
"exactOptionalPropertyTypes": true, /* Interpret optional property types as written, rather than adding 'undefined'. */
"noImplicitReturns": true, /* Enable error reporting for codepaths that do not explicitly return in a function. */
"noFallthroughCasesInSwitch": true, /* Enable error reporting for fallthrough cases in switch statements. */
"noUncheckedIndexedAccess": true, /* Include 'undefined' in index signature results */
"noImplicitOverride": true, /* Ensure overriding members in derived classes are marked with an override modifier. */
"noPropertyAccessFromIndexSignature": true, /* Enforces using indexed accessors for keys declared using an indexed type */
// "allowUnusedLabels": true, /* Disable error reporting for unused labels. */
// "allowUnreachableCode": true, /* Disable error reporting for unreachable code. */
/* Completeness */
// "skipDefaultLibCheck": true, /* Skip type checking .d.ts files that are included with TypeScript. */
"skipLibCheck": true /* Skip type checking all .d.ts files. */
}
}
Let me show you what dependencies I have already. I am using babel because jest required for compilation:
"devDependencies": {
"@babel/core": "~7.16.0",
"@babel/preset-env": "~7.16.4",
"@babel/preset-typescript": "~7.16.0",
"@types/jest": "~27.0.3",
"@types/mongodb": "^4.0.7",
"@typescript-eslint/eslint-plugin": "^5.4.0",
"@typescript-eslint/parser": "^5.4.0",
"eslint": "^8.3.0",
"eslint-plugin-jest": "^25.3.0",
"jest": "~27.4.0",
"standard": "~16.0.4",
"test-jest": "~1.0.1",
"ts-node": "~10.4.0"
},
"dependencies": {
"mongodb": "~4.2.0",
"typescript": "~4.5.2"
},
I am sure is any error in my configuration, can you take a look and help me?
CodePudding user response：
You should reconfigure your standardjs to use ts-standard instead.
interface is a "future reserved keyword" in Javascript. Javascript disallows its use as an identifier so that it can be used as a keyword (as it is in TypeScript). The TypeScript compiler removes the interface definition so it doesn't appear in the compiled Javascript output.
From the standardjs front page FAQs:
standardsupports the latest ECMAScript features. However, Flow and TypeScript add new syntax to the language, so they are not supported out-of-the-box.For TypeScript, an official variant
ts-standardis supported and maintained that provides a very similar experience tostandard.