打字稿/节点无法解析模块路径

Question

I've completely new to both Express and Typescript. I have inherited a project that is using express for an API. I need to make some changes, but to get started, I can't even transpile the code. I have been racking my brain trying to find a solution before turning to SO, but here I am, so please be kind.

When I run:

npm run tsc

I get dozens of error messages that appear related to finding packages:

app/server.ts(2,26): error TS2307: Cannot find module 'express'.
app/server.ts(11,20): error TS2304: Cannot find name 'Promise'.
app/server.ts(30,22): error TS2304: Cannot find name 'require'.

Here is my package.json

 { "name": "my-backend", "version": "1.0.0", "description": "Express backend", "scripts": { "start": "node dist/server.js", "tsc": "tsc", "typings": "typings" }, "keywords": [], "author": "", "license": "ISC", "dependencies": { "body-parser": "^1.15.2", "cors": "^2.7.1", "express": "^4.14.0", "indicative": "^2.1.2", "jsonwebtoken": "^7.1.6", "lodash": "^4.16.1", "moment": "^2.17.1", "mongodb": "^2.2.1", "mongoose": "^4.5.4", "morgan": "^1.7.0", "node-uuid": "^1.4.8", "validator": "^5.5.0" }, "repository": {}, "devDependencies": { "tslint": "^3.11.0", "typescript": "^1.8.10", "typings": "^1.3.0" } } 

Here's my tsconfig.js

 { "compileOnSave": true, "compilerOptions": { "target": "es5", "declaration": false, "module": "commonjs", "moduleResolution": "classic", "sourceMap": true, "emitDecoratorMetadata": true, "experimentalDecorators": true, "removeComments": false, "noImplicitAny": false, "suppressImplicitAnyIndexErrors": true, "outDir": "dist/" }, "exclude": [ "node_modules" ] } 

I've installed all the packages running:

npm install

The NPM log includes the following error:

9 verbose lifecycle my-backend@1.0.0~tsc: CWD: C:\Source\ExpressBackEnd
10 silly lifecycle my-backend@1.0.0~tsc: Args: [ '/d /s /c', 'tsc' ]
11 silly lifecycle my-backend@1.0.0~tsc: Returned: code: 2  signal: null
12 info lifecycle my-backend@1.0.0~tsc: Failed to exec tsc script
13 verbose stack Error: my-backend@1.0.0 tsc: `tsc`
13 verbose stack Exit status 2
13 verbose stack     at EventEmitter.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\index.js:285:16)
13 verbose stack     at emitTwo (events.js:126:13)
13 verbose stack     at EventEmitter.emit (events.js:214:7)
13 verbose stack     at ChildProcess.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
13 verbose stack     at emitTwo (events.js:126:13)
13 verbose stack     at ChildProcess.emit (events.js:214:7)
13 verbose stack     at maybeClose (internal/child_process.js:925:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5)
14 verbose pkgid my-backend@1.0.0

Any pointers / required reading is greatly appreciated.

Answer 1

My friend you need to install typescript definition files. Example: @types/node, @types/express ...

npm install @types/node @types/express -D