Elad Benda2 Elad Benda2 - 1 year ago 105
TypeScript Question

Variable 'a' implicitly has an 'any[]' type

I try to run

npm start
for my angular2 project

but get this error:

push_quick git:(master) npm start

> angular2-quickstart@1.0.0 start /Users/eladb/WorkspaceQa/SupporTool/src/main/webapp/html/push_quick
> tsc && concurrently "tsc -w" "lite-server"

app/shared/stringUtils.service.ts(8,9): error TS7005: Variable 'a' implicitly has an 'any[]' type.

npm ERR! Darwin 15.6.0
npm ERR! argv "/usr/local/Cellar/node/6.3.1/bin/node" "/usr/local/bin/npm" "start"
npm ERR! node v6.3.1
npm ERR! npm v3.10.3
npm ERR! angular2-quickstart@1.0.0 start: `tsc && concurrently "tsc -w" "lite-server" `
npm ERR! Exit status 2
npm ERR!

for this method:

export class StringUtilsService {

mapToFormParamsString( dict : any) : string{
var a:any[] = []
for (var key in dict) {
if (dict.hasOwnProperty(key)) {
return a.join("&");

how can i fix this?

var a = string[]
var a = any[]

didn't help. same compilation error.

btw, I didn't have thi error when compiling with
ng start
or in intellij

ng start
mpn start
or visa versa ?

Answer Source

Probably, in the strinUtils.service.ts. A member or a variable of the componenet has not explicit type. A quick way to fix, since you are not providing the service code, may be

var a:string[] = [] 

The error showed happens on the linting validations, sometimes if the linter is no passing it breaks the compile runtime.