Feature/condition

[mooyoul]

Is it a breaking change?: Maybe

Why did you make these changes?

Closes #30

See https://github.com/balmbees/dynamo-types/issues/30#issuecomment-554690291

What's changed in these changes?

• Implemented Operators for building conditional expressions
• Implemented conditional item operations with type support
• Added type checking for HashPrimaryKey#update and FullPrimaryKey#update

What do you especially want to get reviewed?

N/A

Is there any other comments that every teammate should know?

Now PrimaryKey#update guarantees type safety:

Condition also respects original type:

Submission Type

• [x] Bugfix
• [x] New Feature

All Submissions

• [x] Have you added an explanation of what your changes?
• [x] Have you written new tests for your changes, as applicable?
• [x] Have you checked potential side effects that could make bad impacts to other services?

[mooyoul]

Note: Published this PR as a beta release (v2.9.0-beta.0) to canary channel (npm i dynamo-types@canary)

[mooyoul]

Just published v2.9.1-beta.1 which fixes invalid type inferences in derived class methods (e.g. Table#save with conditions, Table#delete with conditions)