Property 'duration' has no initializer and is not definitely assigned in the constructor. code example
Example 1: Property 'firstName' has no initializer and is not definitely assigned in the constructor
"angularCompilerOptions": {
// ...
"strictPropertyInitialization": false
// ...
}
Example 2: Property 'products' has no initializer and is not definitely assigned in the constructor.
//inside tsconfig.json file
"angularCompilerOptions": {
// ...
"strictPropertyInitialization": false
// ...
}