Build error "All declarations of 'WeakMap' must have identical type parameters"

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Current behavior

After merging the latest seed I’m now getting a compile error on lodash type:

/node_modules/@types/lodash/index.d.ts(19449,15): error TS2428: All declarations of 'WeakMap' must have identical type parameters.

@types/lodash version = 4.14.37

Even if I run yarn and bring @types/lodash to the latest version (4.14.52), I still get the same error!

(FYI, that error does not affect my app building and running, just a nuisance at this point)

Expected behavior no compile errors

Minimal reproduction of the problem with instructions just do npm start

Please tell us about your environment: OS X 11.6, VSCode 1.9.1, tsc 2.1.6

Angular Seed Version: 10c7272
Node: node --version = 7.4.0, npm = 4.0.5

Issue Analytics

State:
Created 7 years ago
Reactions:3
Comments:8 (3 by maintainers)

Top GitHub Comments

2reactions

rernenscommented, Feb 22, 2017

@NathanWalker -

I have checked that. I changed the /node_modules/@types/lodash/index.d.ts to reflect the weakmap definition change to comply with TS 2.2

declare global { interface Set<T> { } interface Map<K, V> { } interface WeakSet<T> { } // interface WeakMap<K, V> { interface WeakMap<K extends object, V> { } }

After that, i could build.prod my project.

1reaction

nghiadocommented, Feb 22, 2017

I found a work around here https://github.com/DefinitelyTyped/DefinitelyTyped/issues/14324#issuecomment-277738061

@NathanWalker I thought that adding skipLibCheck: true to tsconfig.json should fix the problem but turned out that your script is not using tsconfig.json during production build. Looks like a bug to me? @fourctv Just copy build.js.prod.ts to tools/tasks/project and modify line 22 to add

skipLibCheck: true

as tsconfig to makeTsProject let tsProject = makeTsProject({ skipLibCheck: true }, Config.TMP_DIR); then it should work

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