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asbuild ERROR AS238: Initializer, definitive assignment or nullable type expected.

Describe the bug

Hi there, I got an error when executing the npm run asbuil command in Flash Sale demo.
Here's the error detail:

$ npm run asbuild

> [email protected] asbuild
> npm run asbuild:debug && npm run asbuild:release


> [email protected] asbuild:debug
> asc assembly/index.ts --target debug --use abort=

ERROR AS238: Initializer, definitive assignment or nullable type expected.
    :
 34 │ var programFactory: (params: Map<string, string>)=>Program
    │     ~~~~~~~~~~~~~~
    └─ in ../../easegress-assemblyscript-sdk/easegress/index.ts(34,5)

ERROR AS238: Initializer, definitive assignment or nullable type expected.
    :
 35 │ var program: Program
    │     ~~~~~~~
    └─ in ../../easegress-assemblyscript-sdk/easegress/proxy.ts(35,5)

FAILURE 2 compile error(s)

Version

easegress-assemblyscript-sdk: Latest main branch version (fbe70b0)
node: v18.14.0
npm: 9.3.1
OS: macOS 13.2.1

Additional context

I did some research about ERROR AS238 but got nothing useful.
According to the error message, here's what I tried:

diff --git a/easegress/index.ts b/easegress/index.ts
-var programFactory: (params: Map<string, string>)=>Program
+type ProgramFactory = (params: Map<string, string>)=>Program
+var programFactory: ProgramFactory = (params)=>new Program(params)

diff --git a/easegress/proxy.ts b/easegress/proxy.ts
-var program: Program
+var program = new Program(new Map<string, string>())

After rebuild, then it worked. But I'm new to TypeScript, so I'm not sure if it is a correct resolution, or maybe I missed some configuration. Need you guy's help. 🤯

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