如何使用 TypeGraphQL 和 TypeScript 抑制 TS6133 错误？

Question

我从 TypeGraphQL 和 TypeOrm 开始。我开始在https://typegraphql.ml/docs/getting-started.html 中学习“入门”指南。我用自己的班级更改了指南中的班级，所以我有这个：

@ObjectType()
@Entity()
export class Photo {

    @Field(type=>ID)
    @PrimaryGeneratedColumn()
    id: number;

    @Field()
    @Column()
    name: string;

    @Field()
    @Column()
    description: string;

    @Field()
    @Column()
    filename: string;

    @Field()
    @Column("real")
    views: number;

    @Field()
    @Column()
    isPublished: boolean;
}

但是当我编译时出现错误：

src/entity/Photo.ts(8,12): error TS6133: 'type' is declared but its value is never read.

我需要做些什么来抑制 TypeScript 中的这个错误？

Answer 1

您的 id 的 @Field 不需要类型参数：

@ObjectType()
@Entity()
export class Photo {

    @Field(()=>ID) // here is the difference
    @PrimaryGeneratedColumn()
    id: number;

    @Field()
    @Column()
    name: string;

    @Field()
    @Column()
    description: string;

    @Field()
    @Column()
    filename: string;

    @Field()
    @Column("real")
    views: number;

    @Field()
    @Column()
    isPublished: boolean;
}

Answer 2

由于您没有为 TypeScript 正确配置 tsconfig.json，它会在编译阶段检测到错误。 我正在共享一个示例 tscongif.json 文件。 使用 TypeORM 和 TypeGraphQL 二进制文件，它很舒服并且可以满足所需的要求。您可以稍后更改。

前面回答的朋友@Julien TASSIN的问题你可以解决，但是我想提醒你，你知道问题的主要来源是TypeScript编译规则。

TypeORM + TypeGraphQL 的示例 tsconfig.json 文件

{
  "compilerOptions": {
    /* Basic Options */
    // "incremental": true,                    /* Enable incremental compilation */
    "target": "esnext",                        /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
    "module": "commonjs",                      /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
    "lib": ["esnext", "esnext.asynciterable"], /* Specify library files to be included in the compilation. */
    // "allowJs": true,                        /* 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": "./",                         /* Redirect output structure to the directory. */
    // "rootDir": "./",                        /* 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. */
  }
}