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TypeScript error–Property ‘assign’ does not exists on type ‘ObjectConstructor’

A colleague asked me for help when he got into trouble with his TypeScript code. Here is a simplified version:

Although this looks like valid code, the TypeScript compiler complained:

image

After some headscratching, we discovered that there was a “rogue” tsconfig.json at a higher level that set “ES5” as the target. Object.Assign was added as part of “ES6” explaining why TypeScript complained.

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After changing the target to “es6”, the error disappeared.

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