Steps for porting an application from javascript to typescript

1. Change file extensions and fixing broken tests

• Rename *.js to *.ts, allowing implicit any,

• Fix only things that are not type-checking, or causing compile errors,

• Get tests passing again,

2. Explicit any

• "noImplicitAny": true,

• Where possible, provide a specific and appropriate type,

• Get tests passing again,

3. Enable strict mode

• "strict": true,

• "strictNullChecks": true,

• "strictFunctionTypes": true,

• "strictBindCallApply": true,

• "strictPropertyInitialization": true,

• Replace explicit anys with more appropriate types,

• Try to avoid unsafe casts,