Why am I getting "Object is possibly 'null'" error in my Angular code?

Why am I getting "Object is possibly 'null'" error in my Angular code?

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Solving the id Equals 0 Issue in Angular Functions with TypeScript
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Solving the id Equals 0 Issue in Angular Functions with TypeScript

Solving the id Equals 0 Issue in Angular Functions with TypeScript
NodeJS : error node_modules/jest-diff/build/diffLines.d.ts(8,13): error TS1005: '=' expected. in nes

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JavaScript : TypeScript TS7015: Element implicitly has an 'any' type because index expression is not

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NodeJS : Angular 4 Server-side rendering with Node.js (ReferenceError: document is not defined)