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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 asbuild 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)
assemblyscript: 0.27.0
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. And on assemblyscript's 0.19.7 version, it also worked fine.
But I'm new to TypeScript, so I'm not sure if it is the best resolution. Need you guy's help. 🤯

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