Angular TS1003 标识符预期在 throw import 语句中，我的错误源于从 'rxjs' 导入 throw

Question

I have this line of code

import { Observable, throw} from 'rxjs';

I'm getting the error identifier expected:

ERROR in config/config.service.ts(3,22): error TS1003: Identifier expected.

It indicated the error is stemming from that line/ position 22, which is the start of the throw word.

What do i need to do in order to resolve this issue? what do they mean by an identifier?

Answer 1

I came across this looking to resolve the same error, but with a different cause. In case anyone else is having the same, my issue was that I converted some dot-notation references to string notation, but forgot to get rid of the dots!

Example:

// Started with ...   
const variableName = someObject.dynamicPropertyName;
// Was changed to ...
const variableName = someObject.['dynamicPropertyName'];
// Instead of ...
const variableName = someObject['dynamicPropertyName'];

In my case, it was just a bad find-replace-issue. But I imagine that someone may run into this in other situations as well.

Answer 2

First, identifiers are the names that you give to your variables, functions, etc. It's the official term for them and carries with it the rules for which characters are valid within them.

In most cases, though, an identifier cannot be the same name as a reserved word – the names used by the language itself, such as control structures ( if , for , etc.).

let for;
// SyntaxError at `for`

throw is one such reserved word, which represents a statement for raising custom errors, and cannot be used as a variable defined by import .

To get around this, you can specify your own name/identifier (alias) for rx.js' throw with as .

const { Observable, throw as rxThrow } from 'rxjs';

Answer 3

throw is a reserved word, try:

import { Observable } from 'rxjs';
import 'rxjs/add/observable/throw';