property 'myform' has no initializer and is not definitely assigned in the constructor code example

Example 1: Property 'form' has no initializer and is not definitely assigned in the constructor.

"strictPropertyInitialization": false

Example 2: roperty 'form' has no initializer and is not definitely assigned in the constructor.

Just go to tsconfig.json and set

"strictPropertyInitialization": false

to get rid of the compilation error.
Otherwise you need to initialize all your variables which is a little bit annoying

Example 3: roperty 'form' has no initializer and is not definitely assigned in the constructor.

It's better to add the ! postfix operator to the variable name, to just ignore this case, or initialize the variable inside the constructor.