express API server 구현하기 (yarn@4.1.0)

쩡아지🐶·2024년 2월 13일

express 질문저장소

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몬가 yarn 버전 진짜 빨리 바뀌는 느낌? 프로젝트 하나할 때마다 계속 업그레이드되는 것 같다. 아무튼 스타트.


1. 폴더 생성 후 package.json 생성

yarn init

2. yarn berry 셋팅 후 필요한 라이브러리 add

yarn set version berry
yarn add express typescript
yarn add --dev @types/express ts-node nodemon

eslint, prettier 추가하기.

yarn add --dev eslint prettier eslint-plugin-prettier eslint-plugin-import @typescript-eslint/eslint-plugin @typescript-eslint/parser
yarn dlx @yarnpkg/sdks vscode

프로젝트 실행할 때 eslint plugin 설치하는게 제일 싫다... 그냥 싫음.. 아마도 내가 알못이라서 그렇겠지..

3. ts 컴파일을 위해 tsconfig.json 생성

yarn tsc --init

tsconfig.json 내용은 뭐 각자 맞춰서 수정하면 된다.

{
  "compilerOptions": {
  	...
    "target": "es2015",                                 
    ...
    "baseUrl": "./src",
    ...
    "typeRoots": ["../node_modules/@types", "./@types"],
    ...
    "newLine": "lf",
    ...
     },
  "exclude": [
    "node_modules",
    "**/*.spec.ts",
    "**/*.spec.tsx",
    "src/@test",
  ],
}

나같은 경우에는 type들을 한 폴더에서 관리하는걸 선호해서 typeRoots에 포함해주고 개행은 lf로 한다.

4. 대충 코드짜서 얼른 실행

타입 지정

/src/@types/dto.d.ts

declare module 'dto' {
  /**
   * 아카이브 응답 규칙 (response는 반드시 이 형태를 따른다)
   * @description T : body 타입
   * @description isListBody : 목록 데이터 여부, 목록 데이터인 경우 T는 list 데이터 하나 타입
   */
  export interface ArchiveResponse<T, isListBody = true> {
    header: {
      success: boolean; // 로직의 성공 여부
      status: number;
      message: string; // i18n 메세지
      messageOptions?: Record<string, string>; // i18n 메세지옵션
    };
    body?: isListBody extends true
      ? {
          totalCount: number;
          keywords: string[];
          list: T[];
        }
      : T;
  }
}

/src/server.ts

import express, { Application, Request, Response } from 'express';

import photos from '@data/photo/list.json';
import { ArchiveResponse } from 'dto';

const app: Application = express();

const port: number = 8080;

app.get('/photos', (req: Request, res: Response) => {
  const response: ArchiveResponse<any> = {
    header: {
      success: true,
      status: 200,
      message: '성공하였습니다'
    },
    body: {
      list: photos,
      totalCount: photos.length,
      keywords: []
    }
  };
  res.status(200).type('application/json').send(response);
});

app.listen(port, function () {
  console.log(`App is listening on port ${port} !`);
});

근데 실행하니 에러가 난다.

늘상 하던대로 absolute로 import했는데 ts-node가 경로를 못찾음.
찾아보니까 tsnode가 path를 찾을 수 있도록 tsconfig.json에 설정을 해야한다고 한다.

추가로 typeRoots에 지정한 path도 ts-node에서 적용이 안된다. 결과적으로 수정 방법은 ts-node에 files: true 설정

yarn add --dev tsconfig-paths

tsconfig.json

  "ts-node": {
    "files": true,
    "require": ["tsconfig-paths/register"]
  }

두가지 수정하니까 잘 설정된다.

여기까지 했을 때 package.json

{
  "name": "archive-api",
  "version": "1.0.0",
  "main": "server.js",
  "license": "MIT",
  "dependencies": {
    "express": "^4.18.2",
    "typescript": "^5.3.3"
  },
  "packageManager": "yarn@4.1.0",
  "devDependencies": {
    "@types/eslint": "^8",
    "@types/express": "^4.17.21",
    "@typescript-eslint/eslint-plugin": "^7.0.1",
    "@typescript-eslint/parser": "^7.0.1",
    "eslint": "^8.56.0",
    "eslint-config-prettier": "^9.1.0",
    "eslint-plugin-import": "^2.29.1",
    "nodemon": "^3.0.3",
    "prettier": "^3.2.5",
    "ts-node": "^10.9.2",
    "tsconfig-paths": "^4.2.0"
  },
  "scripts": {
    "rundemon": "yarn nodemon ./src/server.ts localhost 8080"
  }
}

.eslintrc

{
  "plugins": ["import", "@typescript-eslint"],
  "extends": [
    "eslint:recommended",
    "plugin:import/typescript",
    "plugin:@typescript-eslint/recommended",
    "plugin:prettier/recommended"
  ],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "project": ["tsconfig.json"]
  },
  "ignorePatterns": ["/src/@test/*", "/.yarn/*", "/.vscode/*", ".eslintrc"]
}

.prettierrc

{
  "singleQuote": true,
  "semi": true,
  "useTabs": false,
  "tabWidth": 2,
  "trailingComma": "none",
  "printWidth": 80,
  "endOfLine": "lf"
}

.tsconfig.json

{
  "compilerOptions": {
    /* Visit https://aka.ms/tsconfig to read more about this file */

    /* Projects */
    // "incremental": true,                              /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
    // "composite": true,                                /* Enable constraints that allow a TypeScript project to be used with project references. */
    // "tsBuildInfoFile": "./.tsbuildinfo",              /* Specify the path to .tsbuildinfo incremental compilation file. */
    // "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": "es2015" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
    "lib": [
      "esnext",
      "ES2015",
      "ES5"
    ] /* 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 legacy experimental 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. */
    // "moduleDetection": "auto",                        /* Control what method is used to detect module-format JS files. */

    /* Modules */
    "module": "commonjs" /* Specify what module code is generated. */,
    "rootDir": "./" /* Specify the root folder within your source files. */,
    // "moduleResolution": "node10",                     /* Specify how TypeScript looks up a file from a given module specifier. */
    "baseUrl": "./src" /* 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": [
      "../node_modules/@types",
      "./@types"
    ] /* 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. */
    // "moduleSuffixes": [],                             /* List of file name suffixes to search when resolving a module. */
    // "allowImportingTsExtensions": true,               /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */
    // "resolvePackageJsonExports": true,                /* Use the package.json 'exports' field when resolving package imports. */
    // "resolvePackageJsonImports": true,                /* Use the package.json 'imports' field when resolving imports. */
    // "customConditions": [],                           /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */
    "resolveJsonModule": true /* Enable importing .json files. */,
    // "allowArbitraryExtensions": true,                 /* Enable importing files with any extension, provided a declaration file is present. */
    // "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. */
    // "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */
    // "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": "./",                                   /* 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. */
    // "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": "lf" /* 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. */
    // "verbatimModuleSyntax": true,                     /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */
    // "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,               /* Default catch clause variables as 'unknown' instead of 'any'. */
    // "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
    // "noUnusedLocals": true,                           /* Enable error reporting when 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,                 /* Add 'undefined' to a type when accessed using an index. */
    // "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. */
  },
  "exclude": ["node_modules", "**/*.spec.ts", "**/*.spec.tsx", "src/@test"],
  "ts-node": {
    "files": true,
    "require": ["tsconfig-paths/register"]
  }
}
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