TypeScript 2.7 breaks @types/lodash

[RangarajKaushikSundar]

Using Typescript Version 2.7.1 seems to break @types/lodash.

node_modules/@types/lodash/index.d.ts:12651:53 - error TS2344: Type 'T' does not satisfy the constraint 'object'.

12651         isWeakSet<T>(value?: any): value is WeakSet<T>;

The solution mentioned online is to switch back to typescript 2.6.2. Please advise.

[aciccarello]

What version of @types/lodash does this affect?

[leafriend]

It seems to be problem of @types/lodash or TypeScript 2.7.1.

Works with @types/lodash@4.14.95:

mkdir types-lodash
cd types-lodash
npm init -y
npm i -D typescript@2.7.1 @types/lodash@4.14.95
cp /dev/null index.ts
npx tsc --init
npx tsc

Broken with @types/lodash@4.14.96:

mkdir types-lodash
cd types-lodash
npm init -y
npm i -D typescript@2.7.1 @types/lodash@4.14.96
cp /dev/null index.ts
npx tsc --init
npx tsc

[leafriend]

UPDATED

Sorry for making you confused. It may not problem of TypeScript because TyepDoc uses its own typescript installed under node_modules/typedoc/node_modules/typescript/lib.

I tested @types/lodash from 4.14.90 to 4.14.104 (latest) with command in below:

mkdir typedoc-test
cd typedoc-test
npm init -y
npm i -D typescript@2.7.2 typedoc@0.10.0
cp /dev/null index.ts
npx tsc --init

# Change @types/lodash version in next line
npm i -D @types/lodash@4.14.104
npx typedoc --out docs index.ts

Result shows that @types/lodash from 4.14.96 to 4.14.100 breaks typedoc building.

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Original Comment

New TypeScript version 2.7.2 is OK now:

mkdir types-lodash
cd types-lodash
npm init -y
npm i -D typescript@2.7.2 @types/lodash@4.14.96
# or use latest `@types/loadash` version 4.14.104
# npm i -D typescript@2.7.2 @types/lodash^4.14.104
cp /dev/null index.ts
npx tsc --init
npx tsc