'Duplicate identifier' errors after upgrade to 1.0.0 final

[uberspeck]

Bug Report or Feature Request (mark with an x)

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- [ ] feature request

Versions.

@angular/cli: 1.0.0
node: 6.9.5
os: darwin x64
@angular/common: 4.0.0
@angular/compiler: 4.0.0
@angular/core: 4.0.0
@angular/forms: 4.0.0
@angular/http: 4.0.0
@angular/platform-browser: 4.0.0
@angular/platform-browser-dynamic: 4.0.0
@angular/router: 4.0.0
@angular/cli: 1.0.0
@angular/compiler-cli: 4.0.0

Repro steps.

Upgrade to [email protected] / [email protected] and run ng-serve

The log given by the failure.

I very carefully followed the migration guide to upgrade from RC4 to final. When I run ng serve I'm seeing the following...

ERROR in /Users/[user]/dev/myProject/node_modules/typescript/lib/lib.dom.d.ts (6945,11): Duplicate identifier 'Headers'.
/Users/[user]/dev/myProject/node_modules/typescript/lib/lib.dom.d.ts (6954,13): Duplicate identifier 'Headers'.
/Users/[user]/dev/myProject/node_modules/typescript/lib/lib.dom.d.ts (9343,11): Duplicate identifier 'Request'.
/Users/[user]/dev/myProject/node_modules/typescript/lib/lib.dom.d.ts (9360,13): Duplicate identifier 'Request'.
/Users/[user]/dev/myProject/node_modules/typescript/lib/lib.dom.d.ts (14893,18): Duplicate identifier 'fetch'.
/Users/[user]/dev/myProject/node_modules/typescript/lib/lib.dom.d.ts (14898,6): Duplicate identifier 'BodyInit'.
/Users/[user]/dev/myProject/node_modules/typescript/lib/lib.dom.d.ts (14929,6): Duplicate identifier 'RequestInfo'.

ERROR in /users/[user]/dev/myProject/node_modules/@types/isomorphic-fetch/index.d.ts (23,14): Duplicate identifier 'BodyInit'.
/users/[user]/dev/myProject/node_modules/@types/isomorphic-fetch/index.d.ts (24,14): Duplicate identifier 'RequestInfo'.
/users/[user]/dev/myProject/node_modules/@types/isomorphic-fetch/index.d.ts (28,5): Subsequent variable declarations must have the same type.  Variable 'headers' must be of type 'any', but here h
as type 'string[] | Headers | { [index: string]: string; }'.
/users/[user]/dev/myProject/node_modules/@types/isomorphic-fetch/index.d.ts (30,5): Subsequent variable declarations must have the same type.  Variable 'mode' must be of type 'string', but here h
as type 'string | RequestMode'.
/users/[user]/dev/myProject/node_modules/@types/isomorphic-fetch/index.d.ts (31,5): Subsequent variable declarations must have the same type.  Variable 'credentials' must be of type 'string', but
 here has type 'string | RequestCredentials'.
/users/[user]/dev/myProject/node_modules/@types/isomorphic-fetch/index.d.ts (32,5): Subsequent variable declarations must have the same type.  Variable 'cache' must be of type 'string', but here
has type 'string | RequestCache'.
/users/[user]/dev/myProject/node_modules/@types/isomorphic-fetch/index.d.ts (41,15): Duplicate identifier 'Headers'.
/users/[user]/dev/myProject/node_modules/@types/isomorphic-fetch/index.d.ts (61,5): All declarations of 'bodyUsed' must have identical modifiers.
/users/[user]/dev/myProject/node_modules/@types/isomorphic-fetch/index.d.ts (81,15): Duplicate identifier 'Request'.
/users/[user]/dev/myProject/node_modules/@types/isomorphic-fetch/index.d.ts (115,13): Duplicate identifier 'fetch'.

ERROR in /Users/[user]/dev/myProject/node_modules/@types/lodash/index.d.ts (19417,15): All declarations of 'WeakMap' must have identical type parameters.

[kunshao-msft]

same error. any update?

[uvv001]

This happens because typescript 2.2.1 include types for "fetch" function. Just remove isomorphic-fetch from package.json.

[SebastianSchenk]

I have the same problem after updating to final. After removing @types/isomorphic-fetch the error still occurs.

[kuncevic]

Got same issue with whatwg-fetch.

I've got @types/whatwg-fetch installed as well that now I thought causing the problem with TS2.2.2 but after I uninstall it just didn't help.

Currently I am just commented the import 'whatwg-fetch'; in polyfils.ts.

UPDATE:
Based on this one microsoft/TypeScript#4948 sounds like Fetch API typings has already make their way to the latest typescript that is why custom file defs for fetch api are no longer needed.

What I've done now is just reinstalled whatwg-fetch and make sure that I do not have typings defs installed for that. So now import 'whatwg-fetch'; in polyfils.ts working just fine.

I think you have to do something similar in case of isomorphic-fetch

[filipesilva]

Closing as answered by @kuncevic, cheers!

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