problem running "npm run server"

[davoutuk]

I have just started the course, and when I try to run the command "npm run server", I get the following error...

D:\Ian\Documents\coding\angular\reactive-angular-course>npm run server

reactive-angular-course@0.0.0 server D:\Ian\Documents\coding\angular\reactive-angular-course
ts-node -P ./server/server.tsconfig.json ./server/server.ts

D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:307
throw new TSError(formatDiagnostics(diagnosticList, cwd, ts, lineOffset))
^
TSError: ⨯ Unable to compile TypeScript
server\search-lessons.route.ts (17,33): Argument of type 'string | ParsedQs | string[] | ParsedQs[]' is not assignable to parameter of type 'string'.
Type 'ParsedQs' is not assignable to type 'string'. (2345)
server\search-lessons.route.ts (18,31): Argument of type 'string | ParsedQs | string[] | ParsedQs[]' is not assignable to parameter of type 'string'.
Type 'ParsedQs' is not assignable to type 'string'. (2345)
server\search-lessons.route.ts (23,59): This condition will always return 'false' since the types 'number' and 'string | ParsedQs | string[] | ParsedQs[]' have no overlap. (2367)
server\search-lessons.route.ts (30,97): Property 'toLowerCase' does not exist on type 'string | ParsedQs | string[] | ParsedQs[]'.
Property 'toLowerCase' does not exist on type 'string[]'. (2339)
at getOutput (D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:307:15)
at D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:336:16
at Object.compile (D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:496:11)
at Module.m._compile (D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:392:43)
at Module._extensions..js (internal/modules/cjs/loader.js:787:10)
at Object.require.extensions.(anonymous function) [as .ts] (D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:395:12)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Module.require (internal/modules/cjs/loader.js:690:17)

npm ERR! Windows_NT 10.0.19041
npm ERR! argv "D:\Program Files\nodejs\node.exe" "C:\Users\Ian\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js" "run" "server"
npm ERR! node v10.16.0
npm ERR! npm v4.0.2
npm ERR! code ELIFECYCLE
npm ERR! reactive-angular-course@0.0.0 server: ts-node -P ./server/server.tsconfig.json ./server/server.ts
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the reactive-angular-course@0.0.0 server script 'ts-node -P ./server/server.tsconfig.json ./server/server.ts'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the reactive-angular-course package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! ts-node -P ./server/server.tsconfig.json ./server/server.ts
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs reactive-angular-course
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls reactive-angular-course
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! D:\Ian\Documents\coding\angular\reactive-angular-course\npm-debug.log

[Elmar101]

too me

[theobroma]

Try to fix TS errors. Here is my quick solution:
// file 'search-lessons.route.ts'

1. Add "as string"
   const courseId = queryParams.courseId, filter = (queryParams.filter || '') as string, sortOrder = queryParams.sortOrder || 'asc', pageNumber = parseInt(queryParams.pageNumber as string) || 0, pageSize = parseInt(queryParams.pageSize as string) || 3;
2. Wrap with "Number"
   let lessons; if (courseId) { lessons = Object.values(LESSONS).filter(lesson => Number(lesson.courseId) === Number(courseId)).sort((l1, l2) => l1.id - l2.id); }
   P.S. Before I got this errors, I had to update ts-node to latest 9.1.1

[gauravgusa]

If you have multiple version of npm; install nvm and use nvm to switch to required version.

on windows install wsl ;
install nodejs on windows ubuntu
then install nvm
nvm use 14.15.0

With above you should be able to proceed.

[mkanyar]

I have just started the course, and when I try to run the command "npm run server", I get the following error...

D:\Ian\Documents\coding\angular\reactive-angular-course>npm run server

reactive-angular-course@0.0.0 server D:\Ian\Documents\coding\angular\reactive-angular-course
ts-node -P ./server/server.tsconfig.json ./server/server.ts

D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:307 throw new TSError(formatDiagnostics(diagnosticList, cwd, ts, lineOffset)) ^ TSError: ⨯ Unable to compile TypeScript server\search-lessons.route.ts (17,33): Argument of type 'string | ParsedQs | string[] | ParsedQs[]' is not assignable to parameter of type 'string'. Type 'ParsedQs' is not assignable to type 'string'. (2345) server\search-lessons.route.ts (18,31): Argument of type 'string | ParsedQs | string[] | ParsedQs[]' is not assignable to parameter of type 'string'. Type 'ParsedQs' is not assignable to type 'string'. (2345) server\search-lessons.route.ts (23,59): This condition will always return 'false' since the types 'number' and 'string | ParsedQs | string[] | ParsedQs[]' have no overlap. (2367) server\search-lessons.route.ts (30,97): Property 'toLowerCase' does not exist on type 'string | ParsedQs | string[] | ParsedQs[]'. Property 'toLowerCase' does not exist on type 'string[]'. (2339) at getOutput (D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:307:15) at D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:336:16 at Object.compile (D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:496:11) at Module.m._compile (D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:392:43) at Module._extensions..js (internal/modules/cjs/loader.js:787:10) at Object.require.extensions.(anonymous function) [as .ts] (D:\Ian\Documents\coding\angular\reactive-angular-course\node_modules\ts-node\src\index.ts:395:12) at Module.load (internal/modules/cjs/loader.js:653:32) at tryModuleLoad (internal/modules/cjs/loader.js:593:12) at Function.Module._load (internal/modules/cjs/loader.js:585:3) at Module.require (internal/modules/cjs/loader.js:690:17)

npm ERR! Windows_NT 10.0.19041 npm ERR! argv "D:\Program Files\nodejs\node.exe" "C:\Users\Ian\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js" "run" "server" npm ERR! node v10.16.0 npm ERR! npm v4.0.2 npm ERR! code ELIFECYCLE npm ERR! reactive-angular-course@0.0.0 server: ts-node -P ./server/server.tsconfig.json ./server/server.ts npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the reactive-angular-course@0.0.0 server script 'ts-node -P ./server/server.tsconfig.json ./server/server.ts'. npm ERR! Make sure you have the latest version of node.js and npm installed. npm ERR! If you do, this is most likely a problem with the reactive-angular-course package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! ts-node -P ./server/server.tsconfig.json ./server/server.ts npm ERR! You can get information on how to open an issue for this project with: npm ERR! npm bugs reactive-angular-course npm ERR! Or if that isn't available, you can get their info via: npm ERR! npm owner ls reactive-angular-course npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request: npm ERR! D:\Ian\Documents\coding\angular\reactive-angular-course\npm-debug.log

This fixed it for me